AlXiH HUblVG CLIA TY L£ TH

KHOA HQC C 6 K 0 N O H t

AlXiH HUblVG CLIA TY L £ T H | T C A T R A , DA LQ1V, AGA

vA cA RdT D£I\I GIA TR| CAM OUAIV V A DIIMH DUaiVG CLIA sAiM P H A M THIT DAIVG CA TRA

Nffuyfe Duy T i n ' , Ng6 XuAn M?nh^

T6MTAT

Nghifn cuu dupe thyc hl^n d^ khSo sAt Anh hutSng ciia lupng thjt vyn nac c4 tra (20Sfi. 25%, 30% vi 35%) vi da Ion (8%, 11%. 14% vd 17%) cQng nhu t^ 1$ aga (3%. 4%. 5% vA 6%) vA cA rdt (8%, 10%, 12% vA 14%) h6 sung d^n giA tri cAm quan vA muc d<> im thich, ty 1$ protein, llpit ci^a sAn p h ^ thit ddng cA tra. Theo ddi Anh hu6ng cua th61 gian bAo quAn d^n ch^t lugng sAn p h ^ cQng dfl dupe ti^n hAnh. K^t quA cho thAy vbi lupng thjt vyn nac cA tra bd sung 25%, da Ign 14%, aga-aga (aga thach trAng) 5% vA cA rdt 10% cho san phAm c6 trang thAl cAu trOc i6t, mAu sdc vA mui v| hAi h6a thich hcjrp; sAn phdm glO dugc giA tr) cAm quan cao sau 6 tuAn bAo quAn trong di^u ki0n bao g6i chAn khAng vA bAo quAn b nhift d^ khoAng (t^C-VfC).

Tix kh6a: Aga (th^cb), cd nit, cd trv, da l(m, lupng Ih/t cA tra, thjt ddng.

LBATVI(ND£

An Giang lA tinh nam b ddu ngu6n s6ng Cmi Long voi ngu6n nude ngpt d6i 6ko ciing v6i h0 thdng song ngoi chSng chjt; nhi6u k^nh, rgch nOi dong dfl mang lai cho tinh nhi^u di^u ki^n t h u ^ Ipi d^ phdt trien nong nghidp, nuoi trong vd ch^ bi^n thuy sdn, dac biet la ca tra. Toan tinh hi^n c6 16 nhd mdy ch^

bien thuy sdn thupc 13 doanh nghidp v6i 13 nhd mdy dang hoat dong eo tong cong suat khodng 120.000 tan/nAm. Hoat dong ch^ bi^n 16n nhu vdy da loai bo ra mot lupng Ion thjt vun nac trong qud trinh chinh, sua cd tra phi le. Do d6, huong nghien cuu eh^ bi^n san pham thjt dong cd tra d^ tdn dung nguon phy pham nay la mot huong di eo y nghia vi khdng nhung gop phan da dang hod sdn p h ^ tix thjt cd tra md c6n lam tang hieu qud su dung nguon nguy^n U^u. Thjt dong ed tra Id sdn pham tixong tu thit ngupi (patS, thjt heo, thit ga dong), cd th^ diing d^ an khai vi trong cdc buoi ti^c; nguy&n li^u diing d^ ch^ bi^n g6m thjt vun nae ed tra, cd rdt, nam meo, da Ign, aga vd mOt sd giavi.

L VAT U ^ VA PHUONG PHAP NGHIEN CUU 1. Nguy6n,v$tU$u

- Nguyen li^u: Thit vun nae cd tra (Pangasius hypophthahnus) dupe mua tai Cong ty Co phdn Xudt nhdp khau An My (Khu C6ng nghidp Phii Hoa, Thoai Son, An Giang). K^t qua phdn tich thanh phdn

'D?i hpc An Giang

^ D^j hpc Nong nghi?p HA Npi

hda hpc trung binh ciJa thjt vyn ngc cd tra cd protein 15,5%, nii6c 72,1596 vd llpit 4,8%.

- Thi^t bj: Cdn phdn tich 0,0001 g, bp cdt damti;

dOng, b0 Soxhlet, tu s^y, mdy do dO dai (TA^TX 2y Texture analyser) lire n^n 25 kg, t6c dp nen 1 mm/s, li;c xi^n 5 g. ti^t di$n ddu do 2 mm.

2. Phuong phdp nghien cuu

- Dya vdo SCT d6 qui trinh ch^ bi^n (Hinh 1) ti^n hdnh:! thi nghiem khao sdt b cdng do^n phdi ch^ co dnh hi -ong tn;c ti^p d^n gid tri <hnh duOng vA gid tri cdm quan eiia sdn phdm. Thi nghiem thii nhat lA khdo sat dnh huong ciia ty 1$ thjt cd tra vd da Ipn bJ sung d^n gid tri cam quan, dO dai vd ham lupng protein vd lipit ciia sdn pham. Thi nghiem 2 Id khao sdt dnh huong aja ty 1$ aga va cd rdt bd sung den gia trj earn quan dp dai cua sdn p h i n . Theo ddi thoi gian bdo quan ciia san phdm.

- Cdc thi nghiem dupe h6 tri hoan toan ngau nhi^n vdi hai nhdn \6 va 3 Idn Idp lai. Moi nhan td dupe khdo sdt 6 4 mire dO. Cd dinh khoi lupng mSu (1 kg nuoc diing), lupng mpc nhi, gia vi bo sung, thii gian ndu. Cdc thdng s6 thay ddi g6m ty 1^ thit vun nge cdc tra, da Ipn, cd rot vd aga. Cdc chi ti6u ddnh gid: ddnh gid earn quan v^ mau sdc, miii vi, eau tnic vd miic do ua thich; do dS dai vd ham luong protein, lipit, amoniac, ch! so axit eua sdn pham.

- Ddnh gid cam quan san pham (mdu sdc, mui vi, cdu tnic) theo TCVN 5090-90 vd miic d6 ua thich sSn phdm theo thang di^m Hedonic bdi 11 thdnh viftn.

Phdn tich hdm lupng protein theo phuong ph^

Kjeldahl, lipit theo phuong phdp Soxhlet, amoniac

24 N O N G NGHIEP V A PHAT TRIEN N O N G T H 6 N - KY 2 - THANG 9/2012

KHOA HQC C 6 N 0 N 0 H (

theo TCVN 3706-90, chi s6 axit theo phuong phdp - Cic lift q u i (tuflc xii 1^ thdng lt« bing phin chuin dp b k g KOH, d(* dai dmjc do bing miy TA- m4m Excel v i Statgraphic 15.0.

TX 2y Texture analyser.

Dalpn

Ldm s^ch, cdt spi

Hip chin Phdich^ 1

1

Aga

Thit vvn n^c cd tra

Rita s^ch, khir tanh

1

Cdt h^t luu, udp gia vi

1

Hip chin

1

Niu

1

R6t djnh hinh

Ldm ngupi nhanh

C i rdt, nim mto

1

Ldms^ch

CStnh6

Nude diing

1

Bao g6i

San phdm

Bao quan l^uih

Hinh 1. Sad6 qui trinh ch^bi^n sdn phdm Ihit ddng cd

•.KFTQUAVATIIAOLUAN

1. Anh hudng cua ty 1$ thit vyn n^c cd tia vd da Ipn bd sung d^n gid tri cdm quan vd hdm lupng protein, lipit cua sdn phdm

Bdng 1. Chdt lupng cdm quan vd d^ dai sdn phdm tfaeo t^ 1^ thjt vun nac cd tra

Tyl^ihit vun nac c i t r a W 20 25 30 35 F P

Chi tieu cam quan Miu

s i c 2,90"

3,50^

3,65' 3,75'' 7,48 0,COO2

M i i i v i 3 , 2 0 ' 3 , 4 0 ' 3 , 4 5 ' 2,60- 10,48 0,0000

Ciu tnic 3,60' 3,43' 2,98"

2,83' 6,21 0,0009

MDUT 6,35"

7,65' 7,15' 6,70- 13,91 0,0000

Dddai (g/mm^

0,51"

0,48' 0,39=

0,35'' 6494,07

0,0000

K^t qud a bang 1 cho thay khi ^ 1$ thjt vim nac ed bd sung thay ddi thi mau sdc, miii vj, cdu tnic, miic do ua thich vd dd dai cua san phdm cung thay ddi theo.

V^ mdu sdc, khi ty 1§ thit ed tang thi di^m cam quan san pham cd xu hudng tang, giiia cdc t^ 16 25%, 30% vd 35% ed diem cam quan tang nhimg chua cd su khdc bi&t thong k6. Vi vay khi ty 1§ thit ed h6 sung 25% thi dung lai vi cd bd sung th6m thi mdu sdc san pham cung khdng tdng I6n cd sir khde bi^L V^ mui vj, khi ty 1§ thit ed tang thi di^m cam quan sdn pham ed xu hudng tdng vi t^o dupe vi ngpt vd miii thom dac trung cua thit cd, nhung giua cdc ty 1^ 20%, 25%

vd 30% diem cam quan tdng chua ed su khdc biet thdng kd. Tuy nhidn a ty Id 35% flii di^m cam quan lai giam vi cdc cam quan vidn cho rdng d ty 16 nay miu vi cua thit ed rat ddm, Ian dt cdc miii vi khac ndn khong

NONG NGHlfP VA PHAT TRIEN N 6 N G THON - KY 2 - THANG 9/2012 25.

KHO* HOC C 6 M 0 NOHt

dupe ddnh gid cao. V^ cdu tnic, khi ty 1^ thit cd tdng thi dl^m cdm quan sdn phdm c6 xu hudng gldm. (j t^

1$ thit ed bd sung 30% vd 35% thi dl^m cdm quan sdn phdm gidm, cd sy khdc bi^t thdng kd so vdi cdc t^ I^

20% vd 25%. Tuy nhidn glQa hai t^ 1$ 20% vd 25% dl^m cdm quan sdn phdm v^ cdu tnic gidm nhung chua cd SI/ khde bi^t thdng kd. Bdn c^nh v i ^ ddnh gid cdu tnic sdn phdm bdng cdm quan thi cdn ddnh gid thdng qua sd do v^ dd dai sdn phdm. K^t qud cho thdy khi ty 1$ th)t cd tdng thi dd dai sdn phdm cd xu hudng gidm vd cd si; khdc bi^t hodn todn gitta cdc t j 1^. V^

muc dd ua thich, ket qud cho thdy d t;^ 1^ thit ed bd sung 25% thi di^m cdm quan cao nhdt (7,65) vd khde bi^t thdng kd so vdi cdc ^ 1$ cdn l?i. Vi d ty 1$ ndy, cdc cdm quan vidn cho rdng sdn phdm cd cdu tnic, mdu sdc tdt, miii vi hdi hda vd cd dd dai, ciing viia phdi, khdng qud dai, ciing hay bd, m^m. Qua phdn tich trdn cho thdy ty 1$ thjt ed thich hpp t^o dupe mdu sdc tdt, miii vi, edu true hdi hda vd miie dd ua thich cua sdn phdm cao. Vl vdy mdu cd ty 1$ thit vyn nac ed tra bd sung 25% dupe chpn d^ ldm thdng s6 cho thi nghidm sau.

Bdng 2. Chdt lupng cdm quan vd dd dai sdn phdm theo t^ 1^ da Ipn b6 sung

tnic cao nhdt nhung vdn chua khdc bi^t so vdi ^ |e 14%. Di^u ndy dupe minh chung thdm qua sd do dp dai. khi tdng t^ 1$ da Ipn thi dd dai ciia san phdm tdng, nhung giOa hai t^ 1$ 14% vd 17% da Ipn cung van chua khdc bl$t thrfng kd. V^ muc dd ua thich, dtjrif da Ipn b6 sung 14% cd di^m cdm quan cao nhdt (7,50) vd khdc bl^t thdng kd so vdi cdc ty" 1$ cdn I^. Vi d ty 1$ ndy, cdc cdm quan vidn cho rdng san phdm c6 mdu sdc, miii vi tdt vd cdu tnic k^t dinh tdt Nhuv^y, t^ 1^ da Ipn bd sung 14% dupe chpn ldm thdng so toi uu dd thyc hi^n cho cdc thi nghidm sau.

Mdu cd ty 1$ Ihjt cd tra bd sung 25% vd da Ipn 14% cd dd dai Id 0,468 g / m m ^ D(> dai d i a cdc m^u cdn I9I dupe thd hi$n rd d phuong trinh hdi qui (1).

Dd thi ludi bidu di^n dd dai ciia sdn phdm theo ty ]^

thjt cd tra vd da Ipn vd dugc ndu trdn hinh 2.

Tylf dalpn

8 11 14 17 F P

Chi tidu cim quan Miu

sic 3,75"

3,60'' 3,25'' 3,20=

3,70 0,0161

Muivi 3,55' 3,20' 3,05'' 2,85' 6,01 0,0011

Ciu tnic 2,85- 3,03"

3,45' 3,50' 4,72 0,0049

MDUT 6,75"

7,05' 7,50=

6,55' 7,48 0,0002

Dddai (g/mm")

0,42"

0,43' 0,44' 0,44' 102,07 0,0000 Ghi chii: Cic sSU^u trong bing 1 vi 2 cimg mdt CQt cd ky hi$u cha sd theo sau gidng nhau thi th4 hiin sir chua khic bi(t & miic jr nghia 5% qua phip thiLSD

Kft qua 6 bang 2 cho thiy khi ting ty If da Ipn Ihi di^m cam quan v4 miu sic, miii vj cua sin p h i n CO xu huong giam vi da Ipn cd m i u hoi sjm, tdi v i miii vj khdng dupe hip dan. Tuy nhidn, giiia cic ty If chua cd su khac bif t thdng kd rd r f t 6 ty If 14% miu sic v i miii vi cd giam so vdi ty If 11* nhung chvra giam d miic dd khic bift. Ngupc lai di^m cam quan vf ciu tnic ting khi ting ty If da Ipn bd sung do da Ipn khi dupe dun niu thi colagen se chuydn hda thinh gelatin, lam ting kha ning k^t dinh cua sin p h i n . Vi d ty If da Ipn 17« di^m cim quan vd cau

•^ .

IJKUlu.i,.,..)

Hinh 2. Dd thi Ifdi bi^u di&i dd dai dia sin phim theo ty If thit c i tra v i da Ipn Phuong trinh hdi qui (1): Z 0,611988 - 0,00634085*X * 0,00488814*Y - 0,0000555556'X*Y- 0,00000188852*X^3 - 0,00000239311*Y"3. Trong d6, Z -dddai ( g / m m ' J i X - t y If thjt c i tra bd sung ()();Y

• ty If da Ipn bd sung (%). Vdi hf sd tuong quan R' - 0,962 cho phdp ta sij dyng phuong trinh de biet d?

dai ciia sin p h ^ theo ty If thjt vvn n^c c i d^ va da Ipn bd sung.

26

/

• >-"• ,•* jf y ^-* .>* <<* f .sr . - < • V- - - f ,-f"

r 4- If ^r .f" .^ ^r r y r,^ ,,- /

Hinh 3. Hdm lupng protein vd lipit ciia cdc miu theo ty 1^ thit cd tra vd da Ipn bd sung

NONG NGHllP VA PHAT TRIEN N 6 N G T H 6 N - KY 2 - THANG 9/2012

KHOA Hpc C 6 H G N G H H

B6n c^nh dd, hdm lupng protein vd lipit ciia cdc mau sdn phdm theo ty 1^ thit vyn ngc ed tra vd da Ipn bo sung CQng dupe phdn tich vd trinh bdy b hinh 3.

Tdm lai, mau cd tf 1$ thjt vun nac ed tra bd sung 25% vd da Ipn 14% cd mdu sdc, miii vi, cdu tnic, muc dp ua thich eao vd nhi^u uu didm hon cdc mdu cdn 1^.

2. Anh hudng ciia tf' 1$ agar vd cd rdt bd sung ddn mdu sdc, mui vi, cdu tnic vd dd dai cua cdc mdu sdn phdm

Sd li^u d bang 3 cho thdy ty 1^ aga thich hpp da tao san pham c6 mau trdng trong d?p, miii vi vd cdu tnic tdt vi aga cd khd nang gii? nude cao, tgo ddng vd ket dinh tdt. Do dd cdc thdnh phdn cua sdn phdm dupe giu chat trong khdi ddng. V4 miii vi vd miic dd ua thich, mdu cd ty 1^ aga bd sung 5% ed didm cdm quan cao nhdt va khde bi^t so vdi cdc mdu cdn lai. V^

mau sdc, miu ed ty Id 4% vd 5% aga cd didm cdm quan cao, nhung giira chiing chua cd su khdc bi^t thdng k^. Khi tdng ty Id aga bd sung, di^m cam quan v^ edu tnic tang, tuy nhidn b hai mau cd ty 1§ 5% vd 6% aga sir tang nay van ehira ed su khde bidt thdng kd. Ket qua do dd dai eua cdc mdu dupe thdng kd xu ly cho thay khi tdng ty Id aga thi dp dai san pham tang vd cd sir khac bi?t giiia cdc mau. O ty Id aga 6% cd sd do dd dai cao nhat, tuy nhidn mdu ndy van khdng dupe chpn vi cae cam quan vidn cho rdng eau true san pham hoi khd, ciing; cdn cdc ty Id aga 3% vd 4% cho cau tnic san pham hoi m^n, chi ed ty Id aga 5% san pham cd eau tnic thich hpp nhat Nhu vay, mau cd ty le aga 5% cd nhi^u uu di^m hon ca, ndn dupe chpn lam thdng sd cho qui trinh ch^ bi^n.

Bang 3. Chdt lupng cdm quan sdn phdm theo ty Id aga bd sung

Bdng 4. Chdt lupng cdm quan sdn phdm theo t^ 1$ cd rdt bd sung

Ty If aga

«)

3 4 5 6 F P

Chi tif u cim quan Miu

sic 3,00- 4,00' 4,30*

3,25- 30,82 0,0000

Miiivi 3,25' 3,60' 4,45'' 4,00=

30,57 0,0000

l:iutruc 3,55' 3,90' 4,55' 4,60=

33,49 0,0000

MDUT 6,15' 6,40' 7,00=

6,50' 16,97 0,0000

Dfdai (g/nun^

0,38' 0,42' 0,5?

0,54'' 470,31 0,0000

c i i ^ t

6 8 10 12 F P

Chineu c i m quan

^iusic 3,35- 3,40' 3,85' 3,95' 7,71 0,0002

Miilvi 3,55' 3,80-' 3,90*

4,05' 5,05 0,0034

Ciutnic 4,60=

4,25' 4,20*

3,55"

24,53 0,0000

MDUT 6,35' 6,60' 6,85' 6,25' 9,64 0,0000

Dddai (g/mm') 0,48' 0,46' 0,45"

0,45- 10,69 0,0001

Ghi chii: Cac so li0u trong cung mot cot co ky hi$u cho so theo sau gidng nhau thi thShien sytchua khac biet & muc y nghla 5%quaphep thu LSD

Ghi chu: Cic sd' li^u trong cung m^t c^t cd k^

hi0u cic cha sd theo sau gidng nhau thi thihi$n sif chua khic biit & muc y nghla 5% qua ph^p thu LSD

K^t qua 6 bang 4 cho thdy khi tang lupng cd rdt thi di^m cdm quan v^ mdu sdc vd miii vi cd xu hudng tang vi mdu dd, vi ngpt thom ciia ed rdt ldm cho mdu sdc, mill vi cua sdn phdm da dang vd hdp ddn hon.

Ngupc lai, di^m cam quan v^ cdu tnic giam vi nhiing mieng ca rdt dupe thdm vdo lam giam khd ndng kdt dinh ciia san phdm. O ty Id cd rdt bd sung 10% san pham cd mau sdc va miii vi tdt, khdng khdc bi^t so vdi mau cd ty Id 12%, cau tnic san phdm cd giam tuy nhidn chira khdc bidt so vdi mau cd ty Id 8%. V^ muK dd ua thich, mdu cd ty \t cd rdt bd sung 10% cd diem cam quan v^ miic dp ua thich eao nhdt vd khdc bi^t so vdi cac mau cdn Igi. Kdt qua do dp dai cho thdy khi tang ty Id ca rdt bd sung sd do do dai san phdm giam, tuy nhien su giam sd do dp dai giiia cac ty Id 8%, 10% va 12% chua cd su khdc bi^t rd r§t qua thdng ke. Nhu vay, ty Id ea rdt bd sung 10% dupe chpn ldm thdng sd cho qui trinh ehd bien.

Bdn canh dd, dp dai cua san pham ciing dupe do dac va xii ly thdng kd de tim ra phuong trinh hoi qui (2) dd bilu didn sir tuong quan giOta dp dai ciia san pham vdi ty Id ca rdt va aga thdm vdo. Qua phuong trinh ta ed thd xdc dinh dupe mau cd ty I^ ca rdt bd sung 10% va aga 5% ed sd do do dai la 0,469 g/mm^.

Dd thi ludi bidu didn dp dai cua san pham theo ty 1^

ed rdt va aga dupe neu trdn hinh 4.

Phuong trinh hoi qui (2): Z -0,216786 + 0,0106053*X 0,077681*Y 0,0001*X*Y 0,0000231767*X^3 + 0,000327723*Y'^3. Trong dd: Z - dp dai (g/mm^; X - ty Id cd rdt bd sung (%); Y - ty le aga bd sung (%) vdi hd sd tuong quan R^ = 0,919 cho phep ta sii dung phirong trinh ndy dd xac dinh dd dai ciia san pham theo ty Id ca rdt va aga bd sung.

N 6 N G NGHIDP V A PHAT TRIEN N 6 N G T H 6 N - KY 2 - THANG 9/2012 27

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Tdm l?i, miu cd t j If aga bd sung 5% vi c i rdt 10% t?o sin phim cd miu sic, miii vi, ciu tnic vi miic dd ua thich cao vi cd nhidu uu didm hom cic miu cdn l^i.

" i ; ^ " ' .

Tyl(igir(*A) TyHtirtl(V.)

Hinh 4. Dd thi ludi bidu dife dd dai ciia sdn phdm theo ^ 1$ cd rdt vd aga 3. Thdi gian bdo qudn aja sdn phdm Trong thi nghidm ndy, cdc mdu bdo qudn dupe d^ng trong bao bi PA hiit chdn khdng vd bdo qudn b nhidt dp 8"O10°C. Sau mdi tudn udn hanh ghi nhdn sir thay ddi v4 cam quan vd phdn tich cdc ehi tidu nhu chi sd axit, hdm lupng NH3 va dp dai eua san phdm.

Ket qua cho thay su hu hdng cua san phdm trong qud trinh bao quan chu ydu Id xuat hi^n nhdt, aga tdch nude va giam dp kdt dinh, edu tnic m^m, mau sdc, miii vi giam. Cae ehi sd axit vd ham lupng NH3 tang, dd dai ciia san pham giam sau 6 tuan bao quan.

Bang 5. Su thay ddi chdt lupng ciia sdn phdm theo thdi gian bdo qudn

Thdi gian bio quin (tudn)

0 1 2 3 4 5 6 F P

Chi tif u theo dsi Chi sd axit

(mg KOH/g)

1,37' 1,41' 1,52' 1,69' 1,73' 1,85' 2,23- 30,28 0,0000

Him lupng NHj (mg/lOOg)

0,33' 0,39"' 0,41' 0,58' 0,66' 0,78'' 0,83'' 56,32 0,0000

DO dai (g/mrrf) 0.58"

0.56"' 0,52' 0,47' 0.41"!

0,38'' 0,32' 46.41 0.0000 Ghi chd: Cac sd' liiu trong cdng niQt cdt co ky hieu cha sd theo sau gidng nhau thi thS hi^n su chua khic bi$t & muc y nghia 5% qua phip thu LSD

Hinh 5. Sdn phdm thjt ddng cd fa Bdng 6. Thdnh phdn hda hoc ciia sdn p

d6ngcAti»

TT 1 2 3 4 5

Chi tieu Nude Protein

Lipit Glucozit

Tro

K&quiOO 8I37

7,42 4,99 4,16 1^9 Ghi chii: Kdt qui phin tich cua Trung tim KSh nghiim Chit lu^ng Ndng Lim Thtiy san An Giang

KL'I qud a bdng 5 cho thdy. chi sd axil dia san phdm tang vd cd su khdc bi^t bdt dau tu tuan thtr3va tudn thii 6; d tudn 1, 2 va tudn 4, 5 co su gia i-n".

nhung giira cdc mau chua cd su khdc bi^t thong kt Chi sd axit tang tir 1,37 mg KOH/g Idn 2,23 mg KOH/g, didu ndy cho thdy thdnh phdn chat beo trong san phdm dd bi thuy phdn theo thdi gian bao quan. Hdm lupng NH3 cung cd su gia tang, ban dau tir khoang 0.33 mg/lOO g Idn 0.83 mg/100 g sau 6 tuan bdo quan. Si; gia tang ham lupng NH3 co tocdo nhanh hon ehi sd axit, ehi sau 2 tudn bao quan ^ugi- tang da cd si; khdc biet thdng kd so vdi san pham ban ddu, di^u nay cho thdy thanh phan protein trong saD phdm cung cd sir phan hiiy theo thdi gian bao quan.

Cdn dd dai cua san pham sau 6 tuan bao quan giam tir 0,58 g/mm- ddn 0,32 g / m m ^ qua thuc t^ cam quan vd do dp dai cua san pham cho thay nhung tm cd dp dai thap hon 0,3 g/mm^ thi san pham mem, d6 dan hdi va kdt dinh kem; d^ \b, ndt

Tdm lai, san phdm thit ddng ea tra dung trong bao bi PA hiit chdn khdng va giir a nhidt dp khoang 8°C-10°C sd giir dupe chat lupng cam quan d iniit chap nhdn dupe trong thdi gian 6 tudn va khdng cf"

dupe ehdp nhdn (cd ddu hidu hu hdng: xudt hi'i' mdc) bat dau tir tudn thii 7, vi th^ trong nghidn i"

28 NONG NGHllP VA PHAT TRIEN NONG T H 6 N - KY 2 - THANG 9/201!

KHOA MpC C6W0 NOM>

lay d i khdng phin tich chi sd axit, h i m lupng NHj / i d d d a i d t u i n n i y .

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Ty If thit vyn n?c c i tra bd sung 25%, da Ipn 14%

tao cho sin phIm cd gii trj c i m quan tdi uu nhit so vdi cic ty If cdn lai. Him lupng protein vi lipit trong san phim lin lupt l i 7,51% v i 5,01%; dd dai ciia sin pham l i 0,468 g/mm*; ty If aga tid sung 5% vi c i rdt 10% tao cho sin phim cd miu sic, miii vi, t r ^ g thii cau true va miic df ua thich cao vi df dai ciia sin pham la 0,469 g/mm'. Sin phira giu dupe gii tri cim quan tdt sau 6 tuin bio quin trong didu kif n bao gdi PA hiit chin khdng v i gia d nhif t dd khoing 8°&

10°C.

TiUuEumitMKHAo

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NXB Khoa hpc v i Ky thujt

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NXB Khoa hpc v i Ky thuit H i Nfi.

THE INFLUENCE OF FISH MEAT, PIG SKIN, AGAR AND CARROT CONTENTS ON TO THE SENSORY AND NLTTRmVE VALUE OF SHUTCHI CATFISH JELLY

Nguyen Duy Tan, Ngo Xuan Manh Summary

Shutchi Catfish Jelly is used as other meat jelly products in the parties, festivals and so on. The research was conducted on an influence of meat fish (2(7%, 25%, 30% and 35%) and pig skin (8%, 11%, 14% and 17%) as well as content of agar (3%, 4%, 5% and 6%) and carrots (8%, 10%, 12% and 14%) added to the sensory value and preferred level, protein, lipid content of the product The time of preservation of this product was also investigated. Results showed that the added shutchi catfish meat was 25% (w/v), pig skin 14%, agar 5% and carrots 10% gave well-stnictured products, good colors and flavors; the sensory value was retained highly after 6 weeks of preservation under vacuum packaging condition and at S^C-lCC.

Key words: Agar, carrot, catSsh meat content, jelly, pig sldn, siiutcbi catSsh.

Ngudi phan bifn: PGS.TS. Nguydn Duy Lim Ngiy nhin bii: 26/5/2012

Ngiy thdng qua phin bifn: 10/9/2012 Ngiy duyft ding: 19/9/2012

igONG NGHIf P VA PHAT TRIEN NONG T H 6 N - KY 2 - THANG 9/2012 ²⁹