Khảo sát thành phần dinh dưỡng của rong bún (Enteromopha intestinalis) ở thủy vực nước lợ tỉnh Bạc Liêu và Sóc Trăng

KHO A HOC C dN O W OHl

K H A O S A T T H A N H P H A N DIIMH D U O N G C U A
ROIMG BLJIXI [E/MTEROMORPHA IIXITESTIIVAUSI O
T H U Y V U C N U O C LO TilXIH B A C LIE U V A SOC T R A N G
N guyin Thi Ngoc Anh 1
t 6 m t At

Nghidn ciiu thanh phan dinh duong cua rong bun (Enteromorpha intestinalis) duoc thuc hien tir thang
3/2011 ddn thang 2/2012 a cac ao quang canh va thuy vuc tu nhien cua tinh Bac Deu va Soc Trang. Ket qua
cho thay thanh phan sinh hoa cua rong bun thay ddi theo giai doan phat trien, trong do thanh phan dinh
duong cua rong non va rong tnrong thanh tuong tu nhau va ca hai co ham luang dinh duong cao hon nhidu
so vai rong gia. Them vao do, thanh phan sinh hoa ca ban va axit amin cua rong bun cung duoc xac dinh a
cac khoang do man khac nhau (thap nhat, trung binh va cao nhat) cho m6i thuy vuc. 6 Soc Trang, mlu
rong bun duoc thu a 3 khoang do man gom 1-2 ppt, 5-6 ppt va 10-12 ppt; ket qua cho thay ti le tuoi/kho cua
rong bun giam theo su tang do man, nguoc lai ham luong lipit va tro tang theo do man, cac thanh phan khac
(protein, xa va hydratcacbon) it thay doi. Ham luang tong axit amin cua rong thu a do man 1-2 ppt va 5-6
ppt tuong tu nhau va co gia tri cao hon mlu rong thu a do man 10-12 ppt Doi vai miu rong bun thu a Bac
Deu vai bon khoang do man: 10-12 ppt, 15-17 ppt, 20-22 ppt va 25-27 ppt, ket qua phan tich bieu thi ti le
tuoi/kho, ham luong lipit va tro co cung khuynh huong vai miu rong thu a Soc Trang. Tuy nhien, ham
luang protein thay doi khac nhau, gia tri thap nhat va cao nhat duoc tim thay a do man 15-17 ppt va 25-27
ppt, nhung a khoang do man 10-12 ppt va 20-22 ppt, rong bun co ham luang protein gan nhu nhau, ham
luang hydratcacbon giam theo su tang do man. Ham luong tong axit amin bieu thj anh huong giong nhu
protein. Ngoai ra, ham luong protein cua rong bun co moi tuong quan thuan voi ham luang dinh duang
trong thuy vuc.
Tir khba: Rong bun, Enteromorpha intestinalis, thanh phan sinh hoa, axit amin, axit beo.

cung cap cac thong tin huu ich ve viec sir dung thich
hop loai rong nay trong cac Unh vuc khac nhau.
O
ddng bang song Cuu D)ng, rong bun

2. PHUONG PHAP NGHKN CUU
(Enteromorpha spp.) xuat hien tu nhien voi sinh
luong cao trong cac thuy vuc nude lo (ao quang
2.1. Thdi gian va dia di£m nghifen cuu
canh, kenh, mirong...) d tinh Soc Trang, Bac Deu,
Khao sat sir bien dong thanh phan dinh dudng
Ca Mau, Ben Tre (ITB-Vietnam, 2011; Nguyfen Thi cua rong bun dupe dinh ky thu mau hang thang trong
Ngoc Anh va ctv., 2013). Rong bun khong nhung cd thoi gian mot nam tu thang 3/2011 den thang 2/2012.
gia tri dinh dirong cao duoc su dung lam thuc an cho Rong bun dupe thu d cac thuy vuc nude lp gdm ao
cac loai thuy san va con ngudi, ma con cd vai tro loc quang canh, kenh tu nhien, kenh nude thai, ao ling,
sinh hpc lam giam su o nhifem moi trudng trong thuy ao nuoi tom tham canh chd cai tao hoac bd hoang,
vuc nuoi thuy san (Aguilera-Morales et al., 2005; kenh, muong gan khu vuc dan cu... co rong bun xuat
Asino et al., 2010). Cac nghien ciru tnroc da tim thaiy hien huyen Vinh Chau va huyen Tran Dd cua tinh Soc
thanh phan dinh dirong cua rong bien thay ddi theo Trang, huyen Hoa Binh cua tinh Bac Deu.
loai, giai doan phat tridn, mua vu va vimg dia ly
Cac yeu td moi trudng co hen quan gdm nhiet do
(Moss, 1952; Kumar et al., 2007) va bi anh hudng bdi
dupe do b in g may do, do man dupe do bang khuc xa
cac yeu td moi trudng sdng nhu do man, nhiet do,
ke, ham lupng NH 47 N H 3, NO;, P O / dupe xac dinh
ham lupng dinh duong (Dere etal., 2003; Baneijee et
al., 2009). Tuy nhien, d nude ta cac yeu td anh hudng bang test Sera (Dire) ngay thoi diem thu miu.
2.2. Phuong phip chuan bi m iu rong bun d l
den su bien dong vd thanh phan dinh duong cua
phan
tich sinh hoa
rong bun chua dupe cong bd. Muc tieu cua nghien
cuu nay la danh gia anh hudng cua cac giai doan phat
Rong bun sau khi thu dupe rua sach va loai bd
tridn va do man khac nhau ddn thanh phan sinh hoa rong tap. Cac m iu rong bun dupe thu trong dpt dau

cua rong bun (Enteromorpha intestinalis) nham tien d moi thuv vuc cua tinh Soc Trang v i Bae Deu
1. GO TUB)

co cung dp man dupe chpn va tach ra 3 giai doan

1\

u Thuy san, Truong Dai hoc Can Tha

\

NG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2014

91


KH O A HOC C dN O N O H l
gom rong non, rong tnrong thanh va rong gia. M 6i
loai rong duoc de rieng, nia sach bang nuoc ngot va
phoi kho trong bong ram 34 ngay. Rong kho duoc
bao quan d nhiet do -15°C de giri phan tich thanh
phan dinh duong. Phuong phap nhan biet hinh thai
cac giai doan phat trien cua rong bun theo nghien
cuu cua Kirby (2001).
2.3. Cac chi tifeu pM n tich
- Thanh phan sinh hoa co ban gom dam tho, lipit
tho, tro, xo va hydratcacbon duoc phan tich theo
phuong phap AOAC (1995).
- Thanh phan axit amin gom cac axit amin thiet
yeu va khong thiet yeu, duoc phan tich theo phuong

phap EZ: faast Amino Acid Analysis of protein
Hydrolysates by LCMS.
- Thanh phan axit beo: axit beo bao hoa va cac
axit beo thiet yeu mach cao khong bao hoa, duoc
phan tich bang phuong phap sac ky khi cua Coutteau
va Sorgeloos (1995).

2.4. TMnh phin anh hoa cua rang bun ( £
in testin a lis 6 die dQ man kh£c nhan
O
m 6i thuy vuc khao sat, rong bun non va rong
trudng thanh dupe thu chung de phan tich thanh phan
dinh dudng d cac do man khac nhau gom thanh phan
sinh hoa co ban (ti le tuoi/kho; dam tho. lipit tho. tro,
xo va hydratcacbon va thanh phan axit amin).
Ti le rong bun tuoi/rong bun kho duoc xac dinh
m 6i lan thu mau. Rong bun sau khi dupe rua sach,
lam rao nude, can 20 g rong tuoi vdi 3 lan lap lai, mau
rong bun dupe trai thanh ldp mong va phoi trong
bong ram 3 4 ngay den khi khoi lupng khong doi.
2.5. X ulysdlifeu
Cac so lieu dupe tinh toan gia tri trung binh va
do lech chuan bang phan mem Excel. Phan tich
thong ke bang phuong phap AN OVA voi phep thu
TUKEY d muc y nghia p<0,05, su dung phan mem
SPSS 14.0.
3. KET QUA VA THAO LIMN

Sau khi so sanh ket qua phan tich, giai doan
3.1. M ot s6 y&i 16 m 6i trudng

rong bun co gia tri dinh duong tot nhat duoc chon de
Cac thong so moi trudng trong thoi gian khao sat
phan tich cho cac dot thu mau ke tiep. Ket qua thu
duoc cho thay rong non va rong trudng thanh co gia dupe tom tat trong bang 1. Nghien cuu nay duoc thue
tri dinh dudng nhu nhau va tot hon co y nghia thong hien dong thdi vdi khao sat ve su bien dong sinh lupng
ke so voi rong gia, do do, rong non va rong trudng cua rong bun, do do cac yeu to moi truong qua cac
thanh dupe thu chung de tien hanh danh gia thanh thang thu m iu rong bun dupe tnnh bay chi tiet trong
nghien cuu cua Nguyln Thi Ngoc Anh va ctv. (2013).
phan dinh duong d cac do man khac nhau.
Bang 1. Cac thdng so moi trudng trong cac thuy vuc thu m iu rong bun
Soc Trang
Bac Jeu
Thuy vuc
Quang canh
Tu nhien
Tu nhien
Quang canh
32,1± 4,2
30,8± 3,7
31,9±3,8
32.2= 3.7
Nhiet do (°C)
(26,5-37,2)
(27,2-38,3)
(26,1-35,3)
(27.5-36.1)
14,1±5,4
3,5±3,5
17,7± 5,6
8.0=3.6

Do man (%o)
(6-24)
(0-15)
(8-28)
(3-20)
8,3±0,4
8,2±0,4
8,3±0,5
8.4=0.2
pH
(7,5-8,7)
(7,5-9,1)
(7,3-9,2)
(8.0-8.7)
2,72±2,10
2,25±1,82
3,88±1,87
N 0 3_(mg/L)
2,49=1.81
(0,3-5,0)
( 0,5-6,0)
(0,5-15,0)
(1,0-5.0)
0,24± 0,17
0,32± 0,13
0,38±0,24
NH4/NH3 (mg/L)
0.21=0.18
(0,05-1,00)
(0,10-0.85)

(0,20-1,50)
(0.10-0.50)
0.27±0,14
0,55±0,38
P04(mg/L)
0,74±0.66
0.35=0.18
(0,25-1,50)
(0,1-0,75)
(0,25-2,00)
(0.10-0.50)

Cac gia tri trong ngoac don bieu thi gia tri nho nhat va lem nhat
3.2.
Thanh phan sinh hoa cua rong bun (E.
hudng giam dan tu rong non, rong trudng thanh va
intestinalis) d cac giai doan k h ic nhau
rong g ia Phan tich thong ke cho thay ti le tuoi/kho
3.2.1.
Thanh phan sinh hoa co ban
cua rong non cao hon co y nghia (P<0,05) so voi rong
Ti le tuoi/kho cua rong bun d cac giai doan khac
nhau cua thuy vuc Bac Lieu va Soc Trang dao dong
lan luot la 10,22-11,01% va 9,81-10,92%; va co khuynh

gia va khong khac biet so vdi rong trudng thanh.
Dieu nay cho thay, rong bun non co tinh hut va giu
nude nhieu hon so vdi rong gia. Ket qua thong ke

NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2014

KHO A HOC COHO N O H j
tuong tu duoc dm thay ddi voi ham lupng dam, lipit
va hydratcacbon cho ca 2 m iu rong bun a Bac Lieu
va Soc Trang. Tuy nhien, m iu rong bun thu d Soc
Trang bilu thi ham lupng dam va lipit cua rong gia
giam nhiiu hon so voi m iu rong gia thu a Bac Lieu.
Ngupc lai, ham lupng tro va xo tang theo su phat
triln cua rong bun. Doi vdi ham lupng tro, giua 3 giai

doan khac biet co y nghia thong ke (P<0,05). Mau
rong bun d Bac Lieu, ham lupng x a cua rong non
thap hon co y nghia so voi rong trudng thanh va rong
gia, trong khi do m iu rong bun d Soc Trang thi ham
lupng x a cua rong trudng thanh va rong gia khac
nhau khong co y nghia thong ke (P>0,05) nhung cao
hon co y nghia so voi rong non (Bang 2).

Lipit tho

Bac Lieu
Soc Trang
Rong gia
Rong non
Rong non Rong trudng thanh
Rong trudng thanh
10,43±0,27ab
10,22±0,34a 10,92*0,35b
1l,01±0,25b

10,21±0,44ab
16,01*0,18b
1 l,50±0,24a 12,73*0,13b
16,83±0,39b
12,99*0,22b
2,00±0,18b
l,2 7 ± 0 ,lla 2,48*0,28b
l,88*0,15b
2,90±0.12b

Tro

28,08*l,19a

33,20±l,86b

43,24±l,31c 29,09*l,17a

36,75*1,63b

47,53*1,40c

Xo tho

2,69±0,32a

3,47*0,34b

5,73*0,41b

3,40*0,62a

4,31±0,29a

6,19*0,22b

hydratcacbon

50,53*2,41°

45,32±2,59b

38,27*l,62a 52,29±2,21b

43,05*1,85*

37,64*2,82“

Thanh phan
sinh hoa
Ti If Uroi/kho
Dam tho

Rong gia
9,81 ±0,48a
7,93*0,52a
0,71*0,13“

Cac gia tri trung binh trong cung m ot hang co k y tu khac nhau thi khac biet cd y nghia thong ke
(P<0,05).

Tom lai, thanh phan sinh hoa co ban cua rong
bun d 3 giai doan cho thay hydratcacbon chiim ti le
cao nhat (37,64-52,29%), ke d in la tro (28,0847,53%),
dam (7,93-16,83%), xo (2,69-6,19%) va chiim ti le thap
nhat la lipid (0,71-2,90%). Ham lupng cac thanh phan
sinh hoa cua rong non va rong trudng thanh tuong tu
nhau va ca hai cao hon co y nghia so voi rong gia.

ham lupng axit palmitic (16:0), axit linoleic (LI),
arachidonic (ARA), linoleinic (LN); EPA va DHA
giam theo su phat triln cua giai doan rong bun, trong
do rong gia co ham lupng thap hon co y nghia so vdi
rong non va rong truong thanh (P<0,05) dupe tim
thay d ca hai m iu rong bun thu d Bac Lieu va Soc
Trang. Rieng ham lupng LN d m iu rong Bac Deu thi
3.2.2.
Thanh phan axit beo cua rong bun
su khac biet giua 3 giai doan. K it qua tuong tu doi
Thanh phan axit beo cua rong bun theo cac giai vdi £SFA d m iu thu Bac Lieu, tuy nhien, £SFA cua
doan khac nhau thu d thuy vuc Bac Lieu va Soc m iu rong Soc Trang su khac biet co y nghia (P<0,05)
Trang dupe th i hien trong bang 3. Ket qua cho thay dupe tim thay giua 3 giai doan.
Bang 3. Thanh phan axit beo cua rong bun (%khoi upng kho) d cac giai doan khac nhau
Thanh phan
Bac Lieu
Soc Trang
axit beo
Rong non
Rong trudng thanh
Rong gia
Rong non Rong trudng thanh

Rong gia
16:0
41,35*l,80b
38,39±l,60ab
36,74*l,20a 39,30*1,25 b
36,77*1,24*
33,60*l,16a
5,93*0,4 l a 9,84±0,40b
18:2n-6
7,64±0,10b
7,18±01,2b
9,83±0,55b
5,55*0,36a
20:4n-6
l,84±0,09b
2 ,0 7 ± 0 ,llb
l,22±0,08a 2,38±0,03b
2,24*0,05b
l,31*0,12a
8,53*0,12b
18:3n-3
10,78±0,28c
5,56*0,1 l a 7,60*0,13b
7,87*0,15b
4,25*0,17a
20:5n-3
0,66*0,05b
0,63±0,08b
0,27*0,08a 2,11*0,04b
l,97*0,03b

0,40*0,13a
0,21*0,04b
22:6n-3
0,19±0,03b
0,10*0,01a 0,47*0,02b
0,54*0.05b
0,22*0,02a
IS F A
49,91*2,81b
46,52*2,53*
47,43*0,70a 49,85*1,82c
47,01±l,68b
41,16*1,15“
£M U F A

17.61*0,25a

18,91*1,02*

19,53*0,26b 18,68±l,45b

19,26*l,19b

15,95*l,36a

IP U F A

16,65*0,20b

18,44*0,59°

12,76*0,23a 16,82*l,37b

18,62*1.1 l c

8,51±0,14a

X n-3 PUFA

14,06*0,29b

14,68±0,27b

8,94*0,12a

13,50*l,01b

14.45*1.13b

6,48±l,22a

X n-6 PUFA

2,59*0,19a

3,76*0,2 l b

3,82*0,10b

3,32*0,14b

4,17±0.12c

2.03*0,1 l a

cac gid u iu u iig uum irung cung m ot nang co cac Ky tu khac nhau thi khac biet co y nghia (fpalm itic axit;18:2n-6: linoleic axit (LI); 20:4n-6: arachidonic axit (ARA); 18:3n-3: linolenic axit (LN); 20:5n-3:
eicosapentanoic axit (EPA); 22:6n-3: axit docoxahexanoic (D H A )S E A tong axit beo bao hoa; Y.MUFA tong
axit beo khong bao hoa noi don; Y.PUFA tong axit beo mach cao khong bao hoa; £ n-3 PUFA tong n-3 PUFA
£ n-6 PUFA tong n-6 PUFA

NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2014

93


Nhin chung, XMUFA, IPUFA, Xn-3 PUFA va Xn*
6 PUFA cua rong bun d ca hai thuy vuc co khuynh
huong tang tu rong non den rong trudng thanh va
giam thap d rong gia. Tuy vay, ket qua thdng ke bieu
thi Mu het cac trudng hpp thi su khac biet giua rong
non va rong trudng thanh khong co y nghia thdng ke
(P>0,05), ca hai giai doan nay co ham lupng cao hon
co y nghia so voi rong gia (P<0,05). Rieng XPUFA cua
m iu rong bun d ca 2 thuy vuc bieu thi sir khac biet
thdng ke giua 3 giai doan (P<0,05). Them vao do, ket
qua bieu thi ham lupng axit beo cua cac m iu rong bun
d 3 giai doan co ham lupng axit palmitic (16:0) rat cao
dao dong tu 33,60 den 41,35% va chiem nhieu nhat (7881%) trong tong ham lupng axit beo bao hoa (XSFA),
do do £SFA cao nhat trong tong cac thanh phan axit

beo cua rong bun; ham lupng LN kha cao (4,25-8,53%).
Ngoai ra, m iu rong bun d Soc Trang cd ham lupng
EPA va DHA cao hon so vdi m iu rong bun d Bac
Lieu. Ham lupng Xn-3 PUFA cao hon tir 3 den 5 lin
so vdi Xn-6 PUFA dupe tim thay d ca hai m iu rong d
Bac Lieu va Soc Trang.

3.2.3. Thanh phan axit amin

tim thay d hau h it cac trudng hpp va ca hai giai doan
rong nay cd ham lupng axit amin cao hon co y nghia
(P<0,05) so vdi rong gia (Bang 4).
Ket qua trong nghifen cuu nay kha phu hpp vdi
nghien ciru cua Moss (1952), tac gia danh gia su thay
ddi ve thanh phin sinh hoa cua rong nau
(Himanthalia elongate d cac giai doan phat triln
khac nhau. K it qua cho thay khdi lupng kho cua
rong tang theo giai doan phat triln tu giai doan c&y
con d in giai doan rong trudng thanh duoc tim thay dr
ca 2 thuy vuc nghien ciru va su tang len d rong gia
khi chung trd nen cung va dai sau khi xuat hien giao
tir. Ham lupng protein tang din theo su phat triln
sinh trudng dinh dudng cua rong nau. Cay rong non
cd ham lupng protein cao nhung sau khi spi rong
xuat hien giao tir, ham lupng protein bat dau giam, va
tilp tuc giam manh d giai doan rong gia va tan lui.
Ngupc lai, rong non cd ham lupng tro cao hon rong
gia. Tac gia k it luan rin g su b iln dong thanh phan
sinh hoa cua rong nau d cac giai doan phat triln khac
nhau dupe tim thay trong ciing mot loai rong dupe

thu d ciing thoi gian trong ciing mot thuy vuc.

Theo Le Anh Tuan (2004), rong b iln d giai doan
Ket qua phan tich axit amin cua rong bun da
phat hien dupe 9 loai axit amin thiet yeu va 8 loai axit cay mam chat lupng t l bao tich luy chua nhiiu va
amin khong thiet yeu. Ham lupng tong axit amin giai doan sinh trudng 1 (rong non) thi tich luy tang
thiet yeu (XEAA) thap hon tong axit amin khong len va giai doan sinh trudng 2 (rong trudng
thiet yeu (XNon-EAA). Ddi voi axit amin thiet yeu thanh/thanh thuc) co th i rong cd kich thudc tdi da
(EAA), ham lupng leuxin (0,42-0,82%), threonin (0,47- va tich luy dat cuc dai. Giai doan gia va tan lui, sinh
0,97%) va valin (0,5%-l,17%) chiem ti le cao trong khi trudng cua rong b iln giam manh do di hoa tang, sic
dd ham lupng methionin chiem thap nhat (0, 10- td rong biln bi b iln mau, cac te bao co khuynh
0,14%) so vdi cac thanh phan khac. Ddi vdi axit amin hudng tach roi, chat dinh duong bj tieu hao nhiiu,
khong thiet yeu (Non-EAA), ham lupng axit glutamic sinh khdi giam. K it qua tuong tu dupe bao cao bdi
(0,53-2,30%) chiem ti le cao nhat, kd den la alanin Manivannan et al. (2009), su thay ddi ro ret ve thanh
(0,61-1,63%) va thap nhat la cystin (0,04-0,14%). Khi phan sinh hoa cua rong b iln theo mua vu, cac y lu td
so sanh thdng ke ve thanh phan axit amin cua 3 giai moi trudng cung nhu cac giai doan phat tn ln cua
doan rong, ket qua cho thay ham lupng cua timg loai rong biln va chu ky hinh thanh bao tir. va thanh
axit amin, XEAA XNon-EAA va XAA cua rong non phin sinh hoa cua rong b iln thay ddi trong cung mot
va rong trudng thanh tuong tu nhau (P>0,05) dupe loai va giua cac loai.
Bang 4. Thanh phan axid amin cua rong bun (% khdi lupng kho) d cac giai doan khac
B a c L ie u

T h a n h p h a n a c id
a m in

R ong non

R o n g tr u c r n g th a n h

S o c T ra n g

R o n g g ia

R ong non

R o n g tru d n g

th a n h

R ong a a

1

E A A
1

A c g in in

0 ,6 1 ± 0 ,0 4 b

0 ,6 7 ± 0 .0 2 b

0 ,3 5 ± 0 ,0 6 a

0 .6 1 = 0 ,0 2 b

2

H is t id in

0 ,2 5 ± 0 ,0 3 a

0 ,2 5 ± 0 .0 5 a

0 .1 8 ± 0 ,0 1 a

0 .3 6 ± 0 ,0 3 b

3

Is o le u x in

0 ,5 9 ± 0 ,0 4 b

0 .5 0 * 0 .0 8 ^

0 .3 3 ± 0 ,0 2 a

0 ,7 3 ± 0 ,0 1 b

0 ,6 9 ± 0 ,0 1 b

0 .3 0 = 0 .0 1 2

4

L e u x in

0 ,8 2 ± 0 ,0 1 b

0 ,7 5 ± 0 .0 6 b

0 .5 5 ± 0 .0 4 a

0 .4 6 = 0 .0 4 a

0 .5 6 ± 0 .0 2 a

0 .4 2 = 0 .0 4 *

5

L v z in

0 ,5 9 ± 0 ,0 6 b

0 ,6 5 ± 0 ,0 5 b

0 .3 1 ± 0 .0 4 a

0 .7 2 = 0 .0 7 b

0 .7 0 ± 0 ,0 3 b

0 .4 1 = 0 .0 4 *

6

M e th io n in

0 ,1 9 ± 0 ,0 1 a

0 ,1 6 ± 0 .0 3 a

0 .1 4 ± 0 .0 1 a

0 .1 6 ± 0 .0 1 a

0 . 1 4 ± 0 .0 2 a

0 .1 0 = 0 .0 2 *

7

P h e n y la la n in

0 ,5 8 ± 0 ,0 5 b

0 .7 4 = 0 .0 7 b

0 .2 7 ± 0 .0 2 a |

0 .5 6 = 0 .0 3 b

0 .6 9 ± 0 .0 1 c

0 .2 1 = 0 .0 1 *

94

0 ,7 5 ± 0 ,0 2 c

O

^ iO

^ 3*1

0 .2 3 = 0 .0 2 *
0 .1 5 = 0 .0 1 * |

NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2014
i


KHO A HOC C b N G N G H t
8
9
1
2
3
4
5
6
7
8

Threonin
Valin
Non-EAA
Alanin
Aspactic axit

Cystin
Glyxin
Glutamic axit
Prolin
Serin
Tyroxin
XEAA
XNon-EAA
XAA

0,97±0,07b
0,91±0,04b

0,94±0,02D
0,88±0,05"

0,47=0,0 la
0,65=0,0 l a

0,75±0,06b
0,88±0,04b

0.84=0.04b
1.17=0,05"

0.25=0.0 r
0.50=0.04J

1,28±0,14b
0,88±0,13a

0,1 l±0,02b
0,81 ±0,17”
1,73±0,14°
0,44±0,02b
0,28±0,01a
0,38±0,02a
5,52±0,12b
5,90±0,31b
11,42±0,99b

1,04±0,09an
1,1 l±0,06a
0,12±0,02b
l,27±0,09b
l,53±0,17ab
0,27±0,06a
0,32±0,06a
0,31±0,05a
5,55±0,08b
5,98±0,13d
1l,53±0,22b

0,66±0.04a l,63±0,50a
0,77±0.02a 0,95±0.04b
0,04±0.01a 0,13±0,03a
0,18±0.06a 0,83±0,02b
l,08±0,05a 2,06±0,10b
0,23±0,01a 0,50±0,01b
0,28±0.02a 0,51 ±0,0 r
0,35±0,02a 0,39±0,04b

3,25±0.15a 5,22±0,18b
3,59±0,18a 7,01±0,45b
6,84±0,03a 12,22±0,63b

0.76=0.0 la
0.88=0.02b
0,14=0.01a
0.88=0.03b
2.30±0.04b
0,50=0.02b
0,41=0.02b
0,35=0.03b
5.79=0.11b
6.21=0.14b
12,00=0,15b

0.61=0.04J
0.72±0,02J
0 .12=0.03a
0.33±0.05a
0.53±0.03a
0,l6±0.03a
0,25±0,01a
0.22±0.01a
2,57±0,08a
2,94±0,15a
5,51 ±0,13a

Cac gia tri trung binh trong cung m ot hang co cac ky tir khac nhau thi khac biet cd y nghia (P<0,05).
YEAA: Tong axit amin thiet yeu; X Non-EAA: TongsxiX amin khong thiet yeu; Y.AA: Tongaxii amin.

Tom lai: ket qua ve thanh phan sinh hoa co ban, so vdi rong non va rong trudng thanh. Do do, trong
axit beo va axit amin cua rong bun d cac giai doan nghien cuu nay rong non va rong trudng thanh dupe
khac nhau co cung khuynh huong: ham luong dinh thu chung va su dung de phan tich ham lupng dinh
duong cua rong non va rong truong thanh khac nhau duong cua rong bun cr cac do man khac nhau.
khong dang ke, mot so chi tieu cua rong truong
3.3.
Anh hudng cua do man din thinh phin
thanh co ham lupng dinh duong cao hon rong non. sinh hoa ca ban cua rong bun
Rong gia co gia tri dinh dudng thap hon co y nghia
Bang 5. Thanh p h in sinh h 6a (%khdi lupng kho) cua rong bun d cac do man k h ic nhau
TP sinh hoa
Dam tho
Lipit tho
Ti le tuoi/kho
Tro
Xa tho
hydratcacbon
Bac Lieu
12,36±0,88b
14,88±0,52b
l,44±0,35a
27,80±l,78a 4 ,0 4 ^ ,5 8 ^ 51,85±0,89b
10-12%o
11,89±0,24b
1l,36±l,02a
5,52±0,94b 51,13±2,81b
l,58±0,03ab
3 0 ,4 ^0 ,9 6 ^
15-17%,
34,28±2,17b 4 ,5 2 ^ ,7 4 * 44,65±2,76a

2,24±0,22c
1 l,37±0,38ab 14,31± 1,03b
20-22%
10,23±0,42a
17,24±0,83c
2,13±0,28b
c
33,98± 1,51b
2,81±0,51a 43,84±2,23a
25-27%o
Soc Trang
5,45±0,34a 54,54±2,29a
18,92±l,45b
0,93±0,06a
20,16± 1,23a
14,74±0,51c
1-2%
12,74±0,27b 17,35±0,67ab
1,57±0, 3°
23,68±2,06ab 4,84±0,56a 52,56±2,38a
5-6%o
l,76±0,15b
26,44±l,36b
3,93±l,51a 51,75±3,29a
16,12±0,86a
1 l,44±0,35a
10-12%

Cac gia tri trung binh trong ciing m ot cot cd cac ky tu khac nhau thi khac biet cd y nghia thong ke
(P<0,05).

Bang 5 bieu thi thanh phan sinh hoa cua rong
bun d cac do man khac nhau. Ti le tuoi/kho cua rong
bun co khuynh hudng giam theo su tang do man
dupe tim thay d ca m iu thu d Bac lie u va Soc Trang.
Trong do, ti le tuoi/kho co gia tri cao nhat (14,74)
dupe tim thay d do man th ip nhat ( 1-2%) va gia tri
thap nhat (10,23) d do man cao nhat (25-27%). K it
qua thong ke bilu thi rin g ti le tuoi/kho cua rong
bun Bac Lieu d do man tu 10% d in 17% tuong tu
nhau, ca hai co gia tri cao hon co y nghia so vdi mau
ron '
o. Ti le tuoi/kho cua m iu rong bun d do
man
■>>. 5-6% va 10-12% thu d Soc Trang khac biet
c0 '
liia thdng ke (P<0,05).
'du rong bun thu cr Bac Li€u: Ham lupng dam
aun Bac Lieu biln dong khong ciing khuynh

hudng voi su thay doi do man. Ham lupng dam trung
binh thap nhat (11,36%) dupe phat hien d do man 1517%, va cao n h it (17,24%) d do man 25-27%. Vdi
khoang do man 10-12% va 20-22%, rong bun co ham
lupng dam tuong tu nhau (14,31-14,88%) va khac biet
co y nghia (P<0,05) so voi m iu rong bun thu d do
man 15-17% va 25-27%. Ham lupng lipit va tro co xu
hudng tang theo su tang do man, trong do m iu rong
bun d do man 10-12% va 15-17% co ham lupng thap
hon co y nghia thong ke (P<0,05) so vdi mau rong d
do man 20-22% va 25-27%. Ham lupng xo tho thap
nhat (2,81%) va cao n h it (5,52%) dupe tim thay d mau

rong bun thu d do man 25-27% va 15-17%, theo thu
tu. Ngupc lai, k it qua cho thiy ham lupng
hydratcacbon giam theo su tang do man.

JG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2014

95


KH<

NGHI

M iu rong bun thu a Soc Trdng: Ham luong dam,

co su bien dong khac nhau. Tuy nhien, cac m iu rong
xa va hydratcacbon giam theo su tang do man. Ham bun co diem chung la ham lupng lipit va tro ting
luong dam cao nhat (18,92%) a do man l-2%o va khac theo su tang do man va ham lupng hydratcacbon
biet (P<0,05) so voi mau rong a do man 10-12%o giam khi do man tang.
3.4.
Anh huong cua dQ man din thinh phin axit
(16,12%). Mac du ham luang x a va hydratcacbon
giam khi do man tang, su khac biet khong co y nghia amin cua rong bun
Thanh phin axit amin cua rong bun Bac D£u d
thong ke (P>0,05). Ham luang lipit tang theo su tang
do man vai gia tri thap nhat (0,93%) dupe tim thay a do cac do man khic nhau dupe tnnh bay trong bang 6.
man l-2%o va khac biet so voi m iu rong thu d do man Doi vdi axit amin th iit ylu (EAA), ham lupng
5-6%o va 10-12%o. Ham lupng tro co cung khuynh acginin, histidin va threonin khong co su khac bi£t
huong vdi lipit, trong do m iu rong thu a do man 10- thong ke giua cac do man (P>0,05). Cac loai axit
12%o co ham lupng cao nhat (26,44%) va khac nhau co amin con lai cua miu rong thu d do man 10-12%o va

25-27%o cd ham lupng cao han cd y nghia (P<0,05) so
y nghia so vdi m iu rong bun dupe thu d do man l-2%o.
Tom lai, thanh phin sinh hoa cua rong bun thu d vdi d do man 15-17%o va 20-22%o duoc tim thay hiu
cic do man khac nhau d tinh Bac Deu va Soc Trang h it cac trudng hop.
? 6. Thinh phan axit amin (9 khoi lupng kho) cua rong bun dupe thu d Bac D6u theo cac dp man kh£c r
25-27%,
15-17%o
20-22%o
Do man
10- 12%o
EAA
0,79±0,07a
0,93=0,06*
1
Acginin
0,96±0,10a
0,78±0,03a
0,26±0,07a
0,23±0,07*
2
Histidin
0,12±0,06a
0,24=0.02*
1,07^,07*
1,23=0,09B
Isoleuxin
l,23±0,15b
0,98±0,03a
3
0,81±0,04b

4
Leuxin
0,66±0,06a
0,69±0,041C
0,77=0,05*
0,82±0,04ab
1,07=0.07®
Lyzin
0,78±0,15a
5
0,74±0,08a
0.14±0,04c
Methionin
0,08±0,01al>
6
0,06±0,01a
0, 12=0 .0 1*
7
Phenylalanin
0,96±0,17at>
O ^ O , ^ 36
0,73±0,08a
1,07=0,08B
Threonin
0,64±0,07a
8
0,68±0,05a
0,64±0,05a
0,72=0.05*
l,17±0,09c

9
Valin
0,80±0,03a
1,01=0.07*
0,97±0,09ab
Non-EAA
1,40±0,07a
1
Alanin
2,1 l± 0 , 10c
l,63±0,14ab
1,84=0.15*
l,91±0,09b
l,48±0,19a
2
Aspactic axit
l,45±0,18a
1,73=0.12*
0,09±0,05a
3
Cystin
0,04±0,03a
0,06±0,03a
0, 11=0 ,01*
0,97±0,41a
4
Glyxin
0,69±0,02a
0,80±0,07a
0,84=0.05*

l,83±0,02c
1,40=0,10a
5
Glutamic axit
1,48*0,08“
1,69=0.14*
0,73=0,07a
6
Prolin
1,02± 0, 10b
0,86±0,06ab
0,87=0.06*
7
Serin
0,84=0,12b
0,51±0,02a
0,68=0,07ab
0.61=0.04*
0.36±0.06a
Tyroxin
0,34=0.08a
8
0.29=0,06a
0,44=0.04*
IE A A
6,94=0,39*
5,81=0,50a
5,92±0,31ab
7,17=0.44c
9,13±0,34c

XNon-EAA
6,58±0.33a
7,25±0,23ab
8,13=0.59*
16,08=0,53b
12.39=0,82a
13.17 ±0,36a
15.30=1.02°
I AA

Cac gia tri trung binh trong cung m ot hang co ky tu khac nhau thi khac biet cd y nghia thdng ke
(P<0,05).
Doi vdi axit amin khong th iit ylu (Non-EAA),
ham lupng : cystin, glyxin va tyroxin giua cac do man
tuong tu nhau. Cac loai axit amin khac cd ham lupng
cao nhat duoc phat hien d do man 10-12%o, k l d in la
d do man 25-27%o. Trong dd, m iu rong thu d do man
15-17%o va 20-22%o khong sai khac nhung thap hon cd
y nghia thong ke (P<0,05) so vdi m iu rong thu d do
man 10-12%o va 25-27%o. Ham luong £EA A YnonEAA va XAA dao dong lan luot la 5,81-7,17%; 6,589,13% va 12,39-16,08% va cd cung khuynh hudng la

96

m iu rong d do man 10-12%o va 25-27%o khong co su
khac biet va ca hai nhom do man nay cd gia tri cao
han cd y nghia so vdi mau rong d hai nhom do man
15-17%o va 20-22%o.
Thanh phan axit amin cua rong bun Soc Trang d
cac do man khac nhau dupe trinh bay trong bang 7.
Doi vdi axit amin th iit y lu (EAA), ham lupng

acginin. lyzin va threonin d do man 5-6%o va 10-12%o
thap hon so voi do man l- 2%o nhung khong khac biet
thong ke (P>0,05). Ham lupng histidin va vahn d do

NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2014


KHO A HOC CONQ N O H j
man l-2%o va 5-6%o tuong tir nhau ca hai cao hon co y
nghia (P<0,05) so voi m iu rong d do man 10-12%.
Ham luong isoleuxin va leuxin giam theo su tang do
man, trong do cr do man 1-2% co gia tri cao hon co y
nghia so vdi m iu rong cr do man 5-6%o va 10-12%o.
Ngupc lai, ham luong methionin thap nhat cr do man
l-2%o va khac bifet cd y nghia so vdi 2 nhom do man
con lai. Phenylalanin cd ham luong cao nhat cr do
m$n 5-6%o va sai khac so vdi do man 10-12%o
(P<0,05). Doi vdi axit amin khong thiet yeu (NonEAA), ham luong axit aspactic giam theo su tang do
m in trong khi tyroxin tang theo su tang do man
nhung cac gia tri nay khong cd su khac biet thong ke
giua cac do man. Cac loai axit amin khong thiet yeu
khac cd khuynh huong giam theo do man, trong dd
m iu rong or do man 10-12% cd cac gia tri thap hon cd
y nghia so vdi m iu rong thu cr do man 1-2%. Ket qua
tuong tu ddi vdi ham luong £EAA, £Non-EAA va
£AA deu giam khi do man tang, su khac biet cd y
nghia chi duoc tim thay giua hai nhom do man 1-2%
va 10-12%.
Bang 7. Thanh phan axit amin (%khdi luong kho)
cua rong bun dupe thu d Soc Trang theo c ic do man

khac nhau
T h an h p h a n a c id a m in

l- 2 % o

5-6%o

10-12%o

EAA
l,0 7 ± 0 ,1 9 a 0 ,8 3 ± 0 ,2 4 a 0 ,90± 0,1 l a
0 ,3 6 ± 0 ,0 5 b 0 ,3 5 ± 0 ,0 2 b 0 ,2 1 ± 0 ,0 5 a
1,5 0 ± 0 ,17 15 1,0 9 ± 0 ,0 1a 0 ,9 3 ± 0 ,2 1 a
0 ,9 4 ± 0 ,1 2 b 0 ,6 4 ± 0 ,0 4 a 0 ,5 5 ± 0 ,1 6 a

1
2

A cg in in
H istid in

3
4

Iso le u x in
L euxin

5

L yzin

1,01 ± 0 1 ,8 “ 0 ,5 6 ± 0 ,1 3 a 0 ,7 2 ± 0 ,2 6 a

7

M e th io n in
P h e n y la la n in

0 ,0 5 ± 0 ,0 1 a 0 ,1 9 ± 0 ,0 3 b 0 ,1 6 ± 0 ,0 5 b
1,0 7 ± 0 ,0 4 ab l,3 0 ± 0 ,2 2 b 0 ,8 0 ± 0 ,0 7 a

8

T h re o n in

0 ,8 4 ± 0 ,1 8 a 0 ,5 9 ± 0 ,2 0 a

V alin

l,2 8 ± 0 ,0 5 b

l,2 4 ± 0 ,2 0 b 0 ,8 8 ± 0 ,0 6 a

6

9

0 ,7 8 ± 0 ,2 3 a

N o n -E A A

1

A la n in

2 ,1 3 ± 0 .1 8 b

l,3 3 ± 0 ,2 3 a

l,4 5 ± 0 ,2 1 a

2

A sp a c tic ax it

2 ,0 7 ± 0 .2 7 a

l,9 5 ± 0 ,1 5 a

l ,7 2 ± 0 2 2 a

3
4

C y stin
G ly x in

o , n ± o , o r 0 ,0 8 ± 0 ,0 2 ab 0 ,0 7 ± 0 ,0 1 a
1 .1 2 ± 0 .1 3 ab l,5 6 ± 0 ,3 0 b 0 ,8 2 ± 0 ,1 3 a

5

G lu ta m ic ax it

6
7

P ro lin
S erin

2 ,0 0 ± 0 .1 3 b l,5 3 ± 0 ,2 3 a l,5 4 ± 0 ,0 5 a
1 ,1 7 * 0 ,0 9 " 1,21 ± 0 ,1 8 b 0 ,8 5 ± 0 ,0 6 a
1 .0 7 ± 0 .1 7 b 0 ,8 3 ± 0 ,0 9 ab 0 ,5 5 ± 0 .0 9 a

8

T y ro x in
y .E A A
Y N o n -E A A

y

aa

0 ,4 3 ± 0 ,0 9 a 0 ,5 0 ± 0 ,0 8 a 0 ,5 7 ± 0 ,1 0 J
8 .1 4 ± 0 ,9 4 b 6 ,7 9 ± 0 ,8 3 ab 5 ,9 2 ± 0 ,6 0 a
1 0 .0 9 ± 0 .6 6 b 8 ,9 9 ± 0 .4 2 b 7 ,5 7 ± 0 ,1 6 a
18 ,2 3 ± 1,51b 1 5 ,7 8 ± 0 ,8 6 ab 1 3 ,4 9 ± 0 ,5 7 a

Cac gia tri trung binh trong cung m ot hang cd k y tu
khac nhau thi khac biet cd y nghia thong ke

(P<0,05).
N hiiu nghien cuu da tim thay thanh phan dinh
dudng cua rong bien bien dong rat ldn, no lien quan
den nhieu y lu td mdi truong nhu nhiet do nuoc, do

man, anh sang va chat dinh duong. Hau h it cac nhan
td mdi trudng thay ddi theo mua vu va thay ddi theo
dilu kien sinh thai, cac nhan td nay cd th i kich thich
hoac uc c h i su sinh sinh tong hop cua nhiiu chat
dinh duong (Dere et al., 2003; Banerjee e t al., 2009).
K it qua nghien cuu cua Benjama and Masniyom
(2011) cho thay rong bun Ulva pertusa thu hoach vao
mua mua cd ham luong cac chat dinh duong cao hon
cd y nghia thdng ke so voi m iu thu vao mua he nhu
protein, lipid, tro, cac nguyen td (K Na, Cu va Zn), va
mot sd axit amin (glutamic axit, acginin, threonin va
alanin). Them vao dd, ham luong dinh dudng cua
rong biln bi anh bdi ham luong cac chat dinh dudng
trong mdi trudng sdng cua chung. Ham luong
protein trong rong biln cr thuy vuc nhiet ddi va a
nhiet ddi thudng thap do trong mdi trudng biln phan
ldn la thuy vuc ngheo dinh dudng vdi su sin cd cua
cac muoi dam cd ham luong thap (Manivannan, et
al., 2009). Bao cao tuong tu cua Lartigue and
Sherman (2006), su thay ddi ham luong nito vo ca va
do man trong thuy vuc cd anh hudng nhiiu hon la su
thay ddi cuong do anh sang trong viec xac dinh kha
nang tich luy nita trong md rong va su giam N 0 3
trong thuy vuc. Rong bun (E. lingulatii) cd kha nang
chuyln hoa N 0 3- nhanh hon trong dilu kien ham

luong N 0 3 cao va cr do man thap. D ilu nay cd anh
hudng ldn d in tong ham luong dam trong md cua
loai rong bun (E. lingulata).
Baneijee et al. (2009) danh gia thanh phan sinh
hoa cua ba loai rong biln (E. intestinalis, Ulva
lactuca va Catenella repent) d vinh Bengal, An Do tir
thang 9/2007 d in thang 6/2008. Tac gia k it luan
rin g thanh phin sinh hoa cua rong b iln bi anh
hudng ldn bdi mdi trudng nude (do man, nhiet do va
ham luang nitrat) d khu vuc khao sat. Cu th i, ham
luong protein cua ba loai rong b iln khao sat tuong
quan thuan cd y nghia thdng ke vdi ham luang nitrat.
Ham luong hydratcacbon cao nhat duoc tim thay d
tram thu m iu cd do man cao va tuong quan thuan vdi
nhiet do nude. Dac biet, nhiet do ddng vai trd quan
trong ddi vdi su bien dong ham lupng lipit cua rong
biln, khi nhiet do cao thi ham lupng lipit cua rong
b iln thip. Nghien cuu tnroc k it luan rin g nhiet do
cao lam tang ham lupng chudi axyl cua axit beo
khong bao hoa d in d in lam giam su trao ddi chat va
su van chuyen lipit, do do, rong bien phat triln d
thuy vuc cd nhiet do va do man cao thi co ham luang
lipit th ip (Jones and Harwood. 1993). Ket qua nghien
cuu hien tai phu hpp voi nhan dinh tren.

NO NG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2014

97

KHO A HOC C bN O N O H l
Theo Qing etal. (2006), rong bun Enteromorpha
linza chira 18 loai axit amin, protein va khoang chat,
cao horn cac loai rong khac (Laminaria japonica,
Porphyra haitanensis, Hizikia fusiformis va Undaria
pinnatifida). Cac axit amin thiet yeu chiem khoang
53% tong axit amin cua rong E. linza. Horn nua, rong
bun rat giau cac axit beo thiet yeu khong no nhu LN,
ARA va EPA (Aguilera-Morales et al., 2005).
Shanmugam and Palpandi (2008), bao cao rang rong
Ulva reticulata thu tir Vellar cira song cua An Do, cho
thay rin g rong Ulva co ham luong lipit, dam,
hydratcacbon, nude va cac axit beo tuong ung la 50,
25, 8, 48, 19, 98 va 1,7% khoi luong kho voi cac loai
axit beo dien hinh nhu axit palmitic, axit oleic, axit
linoleic.
Ngoai ra, trong thoi gian thu m iu d cac thuy vuc
giau dinh duong (ham luong NH 4/N H 3: 3-10 mg/L,
N 0 3: 10- 50 m g/L va P 0 4: 2-5 mg/L) nhu ao tom
tham canh bo trong, kenh/ao nude thai tir he thong
nuoi tom, nude thai sinh hoat, ao bon phan cua he
thong nuoi Artemia, cic m iu rong bun nay co ham
luong protein (20-28%) cao hon so voi cac thuy vuc tu
nhien va ao quang canh (protein: 10-17%). Phuong
trinh tuong quan bieu thi ham luong protein cua
rong bun co tuong quan thuan vdi ham luong N 0 3
trong moi trudng song cua chung (Y =0,245+10,994;
R2 = 0,784). Ket qua nghien ciru nay phii hop vdi
nghien cuu truoc. Lartigue and Sherman (2006) nhan
thay rong bun (E. lingulata) co kha nang chuyen hoa

N 0 3 nhanh hon trong thuy vuc co N 0 3 cao. D ilu nay
co the lam tang su tich luy protein trong mo cua loai
rong niy. Cac loai rong luc Ulva spp. song trong moi
trudng giau dinh dudng thi co ham luong protein
tang tir 11% den 32% (Benjama and Masniyom, 2011).
C ic ket qua ve thanh phan sinh hoa co ban, thanh
phin axit beo va axit amin cua rong bun trong
nghien cuu nay cho thay rong bun co g ii tri dinh
dudng cao co the li thuc an tot cho cac loii tom, ca
nuoi d DBSCL
4. KET UJAN

Thanh

duong cua rong bun
(.Enteromorpha intestinalis) thay doi theo cac giai
doan phat trien, trong do rong bun non va trudng
thanh co gia tri dinh duong cao hon so voi rong gia
va bj anh huong bdi dieu kien moi trudng song nhu
nhiet do, do man, ham luong chat dinh dudng trong
thuy vuc. Rong bun phat trien trong thuy vuc giau
dinh duong thi co ham luong protein cao.

98

phan

dinh

w m vm akt

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Carrillo-Dominguez, S., Gonzalez-Acosta. B. and
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large yellow croaker (Pseudosdaena crocea,
Richardson, 1846) diets. Aquaculture Research, 1-9.
3. Banerjee, K Ghosh, S. Homechaudhuri and
A Mitra, 2009. Biochemical composition of marine
macroalgae from Gangetic Delta at the Apex of Bay
of Bengal. African Journal of Basic & Applied
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Chemical composition, element and amino acid
profiles of Ulva intestinalis from the shrimp cultured
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protein, total soluble carbohydrate and pigment
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the Sea of Marmara, Turkey. Oceanologia 45, 453471.

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intestinalis. Phytochemistry 34,969-972.

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Botany. Monteray Bay Aquarium.
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study of nitrogen storage and nitrate reductase
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(Rhodophyceae). Estuaries and Coasts 29. 699-708.

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Enteromorpha linza. Marine Sciences, 5 pp.

INVESTIGATING NUTRITIONAL COMPOSITIONS OF GUT WEED (ENTEROMORPHA
INTESTINALIS) IN BRACKISH WATER BODIES FROM BAC UEU AND SOC TRANG PROVINCES
Nguyen Thi Ngoc Anh
Summary
Study on nutritional composition of gut weed (Enteromorpha intestinalis) was conducted from March 2011
to February 2012 at the extensive farms and the abandoned ponds from Bac Lieu and Soc Trang provinces.
Results showed that the nutritional values of gut weed had variations in different developmental stages, in
which the nutritional values of young stage were comparable to or better than the adult one and both were
superior to those of the senescent stage. Furthermore, the proximate composition and amino acid profiles
of gut weeds were also determined at different salinity ranges (the lowest, intermediate and highest ranges)
for each habitat In Soc Trang, gut weed samples at three salinity ranges, namely 1-2 ppt, 5-6 ppt and 10-12
ppt were analyzed, these results exhibited that the wet/dry ratio decreased with increasing of salinity while
the total lipid and ash contents increased with salinity, and other components (protein, fiber and
carbohydrates) showed slighdy changes. For amino acid composition of these samples, total amino acid
collected at salinities of 1-2 ppt and 5-6 ppt were similar and both were better than the ones harvested at
salinities of 10-12 ppt For gut weed samples recorded from Bac Lieu at four salinities ranging between 1012 ppt, 15-17 ppt, 20-22 ppt and 25-27 ppt, analysis results revealed that the wet/dry ratio, total lipid and ash

contents followed the same pattern as observed for Soc Trang habitat However, the protein contents of
these samples varied in different ways, the lowest and highest protein contents were found in the 15-17 ppt
and 25-27 ppt samples, respectively, while protein values in the 10-12 ppt and 20-22 ppt samples were almost
equal; the carbohydrate levels reduced with increasing salinity. For amino acid profile, showed the identical
effects as observed for protein contents. Moreover, the protein content of gut weed was positively
correlated with nutrient level in the water bodies.
Keywords: Gut weed, Enteromorpha sp., proximate composition, fatty acid, amino acid.
Ngudi phan bien: TS. D 6 Van Nam
Ngay nhan bai: 13/01/2014
Ngay thong qua phan bidn: 13/02/2014
Ngay duyfct dang: 20/02/2014

IONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 6/2014

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