NGUY§N THAC HOA - Nghiin cihi sii dung dung dich axit...
NGHI£N cCiXJ sir DUNG DUNG DICH AXIT AXETIC, AXIT LACTIC, DICH CHlfiT
H A N H , T O I , G U N G D 6 XLTLVTHIT VIT
KEO DAI THdl GIAN B A O QUAN DANG TUOI
Nguyin Thgc Hod'*, Nguyin Vdn Hdi^, Le Thi Tdm' vd Le Thi Nguyen'
'Bo mon Sinh ly, sinh hoa. ^Tram Nghien ciiru che bie'n cac san pham chan nuoi
* Tac gia de lidn hd: Nguydn Thac Hoa, Bd mdn sinh ly, sinh hod vat nudi Tel: (04) 8.386.132/ 0983.319.652; Fax: (04) 8.389.775;
Email: [email protected] ABSTRACT
Use of acetic acid, lactic acid and the onion, garlic, ginger extracts to treat duck meat for lasting its storage time
The aim of this study was to evaluate the effect of various concentrations (0.5; 1.0; 1.5; 2.0; 3.0; 4.0%) of organic acids such as: acetic acid, lactic acid, citric acid, formic axit and the onion, garlic, ginger extracts on microbial treatment in fresh duck meat. The treated duck meat samples were hanged under air, packed by HDPE bag, kept at 6 - 8''C and determined the microbial density. The results were as follows: Spraying axit solution within 30s was good enough to treat the samples. The bactericidal effect of axit solutions increased parallel with increasing its concentrations. Solution of 2% of acetic acid, lactic axit and mixture of them had good enough for bactericidal effect but did not change the quality of the meat samples. Fresh duck meat (with TPC < 10' CFU/g), treated with solution of 2% of acetic acid, kept at d-S^C, could be stored for 12 days with high quality. Extract from garlic had good enough bactericidal effect but made the change of natural colour of duck meat so will have difficulty when apply in practice.
Key words: organic acids, garlic, ginger, duck meat.
DAT VAN Y)t
Theo sd lidu di6u tra vi chung loai va san lupng cac san phdm chan nudi dupe tidu thu trdn thi trudng, thit gia cdm (trong dd cd thit vit) dirng d vi tri thiir 2 chi sau thit lpn va la loai thuc phdm bd dudng dupe ua thich khdng chi trong biia an gia dinh ma cdn dupe chd' bidn thanh nhi^u mdn an dac san, thu hut khach dm thuc sanh dieu trong va ngoai nude. Didu nay da gdp phdn tao di^u kien thuan Ipi cho nganh chan nudi gia cdm, trong dd ed chan nudi vit, phdt trie'n manh theo so lieu Bao cao cua Cue Chan nudi, Bd Ndng nghidp va PTNT, 2007. So lupng dan vit ngan ea nude nam 2006 dat 62,6 trieu eon. Tuy nhidn, khdng nhu d cac nude chan nudi phat trien, ngudi tieu diing nude ta chua cd thdi quen sii dung cdc loai thuc pham cap ddng hoac da chd' bie'n sdn ma chu yd'u tidu thu b dang thit tuoi. Khi hau nhiet ddi ndng dm va tinh trang d nhidm mdi trudng sd'ng ndi chung, mdi trudng chan nudi, gidt mo ndi ridng dang la nhirng trd ngai cho thdi quen tidu thu thit tucri nay, dac bidt trong nhiing nam gdn day, khi dich ciim gia cdm da xdy ra tai nhieu dia phuong trong ca nude.
Mdt trong nhiing tac nhan chinh lam giam cha't lupng thit la eae vi sinh vat gay hai lay
nhidm ldn thdn thit trong qua trinh gie't md, bao quan, chd' bidn. De han chd tdc dp phat trien
cda vi sinh vat gSy hai thit nhung an toan ddi vdi ngudi tieu dung, nhieu bidn phap xir ly thit
da dupe nghien ciru dp dung. Mdt sd axh hiru co, mdt vai loai khang sinh thuc vat ed tac dung
didt khu^, keo dai thdi gian bao quan thit tuoi, lam tang tinh hdp ddn, tinh ngon midng nhung
an toan vdi ngudi tidu diing dupe phep sir dung tai nhieu nude. Tuy nhidn, do tac dung nay phu
thudc vao nhi^u yd'u td ndn kd't qua lira chpn chiing loai va ndng dd su dung cQng nhu bidn
VIEN CHAN NUOI - Tgp chi Khoa hgc Cdng nghi Chdn nudi - So 8 - Thang 10-2007
phap xir ly mdu...khdng gid'ng nhau. Nhdm tham dd kha nang iing dung cdng nghe nay vao dieu kidn eu the eiia Viet Nam va lua ehpn dupe dang sir dung eung nhu phuong thiie xir ly phii hpp mdt sd loai axit hiru eo dupe phep sir dung trong chd' bidn, bao quan thue phdm, mdt so loai gia vi thdng dung nhu hanh, tdi, gimg... dd' keo dai thdi gian bao quan thit vit tuoi, ehiing tdi tidn hanh nghidn ctiu ndi dung nay. , .^ ,)<. • < \'^'\ \. u-iv»'.y ^\
VAT LIEU v A PHUONG P H A P NGHIEN CUU "" "^' Vdt lieu nghien ciiu
- Thit vit tuoi. , ; , . - . . . . v.. .i;miuiL"ii,:. .,ir;n:J;«m:^ M..^,,. rv - Mdt so loai gia vi
+ Toi (Allium sativum L) i ii HT'i'.iA " ' ' '
-I- Hanh (Alium fistulosum IS) ,.. bb^ ',U>BI ,bl3B-iiJ'>'7Klo »'J ' • '•' '•'''' + Gimg (Zingiber officinale Rose.)
- Axit axetic, axit lactic, a xit citric, axit formic ,'! ^ibu £.vj oi ^-'-^ -^ ''^ > - Phuang phdp nghien citu • . , . . ;ri
- Phuong phap ehudn bi dung dich axit hixu eo: pha loang theo don vi thd tich
- Phuong phap xac dinh pH dung dich axit: bang pH meter WTW-330 cua Diic, sir dung didn cue thuy tinh.
- Phuong phdp ehuan bi hanh, tdi, gimg de xir ly mdu thit vit thi nghidm:
Dang bdt nghien: Hanh, tdi, gimg dupe lam sach, nghien min bdng mdy xay sinh td.
Dang dieh ehie't
-I- Dgng dich ep: hanh, tdi, gimg dupe lam sach, nghidn min va bd sung nude thanh dang bdt nhao, Ipe qua 21dp vai bdng sach hoac ly tdm d tdc dp 3.000 vdng/phiit trong ISphiit de thu dieh ehiet trong. v, ... • : • 'i .; , , t; 2n( i!i rnfeo uis tirl'.iiniiinl iri!
+ Dgng nhua ddu: hdnh, tdi, gimg dupe lam saeh, nghien min, bd sung edn va chung thu hdi phdn tinh ddu bang phuong phdp tach phan doan trong edn.
Phuang phdp xuly, bdo qudn tint vit ' '•••'" '•'- "^ • * ' ''' •'• ' '"-^^ "'"' '^^ ''>^'" ^"*'"^
-I- Ngdm xir ly mdu trong dung dieh axit him eo, dieh chid't hanh, tdi, gimg
+ Phun xir ly mdu bdng dung dieh axit him eo, dieh chid't hanh, tdi, gimg, bdng binh phun nude cam tay (hand sprayer). . ,^ ,,",,,,,, ,.,• j^i; lofi o;;>),. •
^ 'i.ii lOi;! rn, ijiij rj,:, r..ijp loriJ otio iii§n Phicang phdp bdo qudn mdu thi nghiem
- Mdu sau xir ly dupe bao gdi kin trong tiii HDPE vd triing (Stomacher beg), bao quan d nhiet dp tir 6 - 8'C
- Mdu thit kiem tra chi tidu VSV dupe Idy theo tidu ehuan VN 48833 - 2002.
- Mire dp nhidm 5 nhdm vi khudn ehi diem (Vi khudn hieu khi tdng sd, Coliform tdng so, Clostridium perfringens, Stafilococcus aureus. Salmonella) dupe xdc dinh theo phuong phap FAO - 1992.
'-00:.-''lf t NGUYEN THAC HOA - Nghien cim sic dung dung dich axit...
Bd tri thi nghiem
Chuan bi mdu: t'mn thit vit (da loai bd phii tang ddu, ed, ehan, canh) dupe xe doe theo xuong sdng thanh 2 manh ddu nhau dd phan Id thi nghidm theo cap
- Sd ldn lap lai: -(- TN kiem tra eae ehi tidu VSV (2 dpi) vdi sd lupng 52 mdu :«a't.. ;Mi^>ni^i ,ui'M -i-TN bao quan mdu sau sir ly (3 dpi) '
Ai? l-y so lieu ket qua: bdng phuong phap thdng kd sinh vat hoe, bdng chuong trinh Microsoft Excel 2000
Dia diem trien khai
+ Bd mdn Sinh ly, sinh hod vat nudi - Vidn Chan nudi.
+ Phdng phan tich T A G S va san pham ehan nudi - Vidn Chan nudi - i -(- Trung tam kiem tra vd sinh thii y TWl - Cue Thii y.
^' + Lidn hiep KHSX Cdng nghd sinh hpc va mdi trudng, Vidn Khoa hpc va Cdng nghd Viet Nam. ' ^-
\ ' / ' ' ^ , - •' • ' r ' - - - • ^ '
(ii Thdi gian tien hdnh: 2005. ., ' i j , ,,;
Vl": . . . . . ., .... , , . . , , - . - . - I t . . '
" ' " KET QUA v A T H A O LUAN
Ket qud xdc dinh chiing logi vd nong dp dung dich axit huu ca thich hgp
Trong sd eae axit hiru eo dupe coi la an loan (GRAS) va dupe phep sir dung trong xii ly, bao quan thue phdm. Cd 4 loai axit da dupe so bd chpn de' xir ly mdu thit vit la ax.axetic, ax.lactic, ax.citric, ax.formic. (Quatara B.R ; Simart R.E, 1997; Robin L. Joseph, 1997).
Tuy nhidn, can cir kdi qua thir nghidm thu dupe va y kidn ddng gdp ciia ngudi tidu diing, axit formic do lam mdt mdu tu nhidn eiia mdu (chuydn thanh mau soeola), axit citric cd vi ehua rd ndn bi loai. Hai axit edn lai a. axetic va a.lactic dupe sir dung de tham dd ndng dp pha loang dd dat pH phu hpp vdi ydu edu thi nghidm.
Kd't qua xac dinh dp pH eiia dung dieh 2 loai axit trdn theo eae ndng dp pha loang khac nhau trinh bay tai bang 1.
Bang 1: pH eiia dung dieh 2 loai axit hihi eo theo ndng dp pha loang.
Ndng do pha loang ' ', 0 , 5 % V% 1,5 % 2 % 4 % Loai axil
Axit axetic Axit lactic
Hdn hpp axit acetic 1% + axit lactic 1%
* Nude cat dimg de pha loang cd pH = 7,0 a 28 "C.
Sd lieu bang 1 eho thdy: pH dung dieh tang theo ndng dp axit sir dung, trong dd axit lactic eho gid tri cao nhdt d ea 5 ndng dp pha loang. O ndng dp pha loang 2% cua ea 2 loai axit, pH deu dat xap xi 2,0. Kdi qua nay cao hon chiit it so vdi sd lieu eong bd ciia Kang Seoknam. Jang Aera, Sang ok lee (2003).
Dp pH dupe danh gia la phii hpp va dat hidu qua cao trong xir ly bao quan thuc phdm dang tuoi. b o dung dieh 2% a.axetic bdt ddu ed miii dam kha rd nen chiing toi thir nghiem bd sung them hdn hpp eiia 2 axit trdn. mdi loai 1%. Kdi qua xac dinh pH eiia dung dieh hdn hpp nay eung dat pH xap xi 2.
Dung dieh ed ndng dp pha loang cao hon (4%) cua 2 loai axit trdn khdng dupe lira chpn, hoac do dd pH thay ddi khong tucmg ximg vdi chi phi gia thanh (ddi vdi axit lactic), hoac dd
2,65 2,28
_
2,52 2,12
-
2,35 2,07
-
2.12 1,96 2,15
1,98 1,74
-
VIEN CHAN NUOI - Tgp chi Khoa hgc Cdng nghe Chdn nudi - So 8 - Thang 10-2007
lai mili ehua kha rd(dd'i vdi a.axetic) trdn mdu thit dupe xir ly, ed thd gay tam ly e ngai cho nhiing ngudi tieu diing khd tinh.
Ket qud dieu che dich chiet tic hdnh, toi, gieng
Tuy thit vit la mdt loai thue pham bd dudng nhung do cd tinh han, mui tanh hon eae loai thit gia edm khde ndn theo kinh nghidm dm thue ed truyen, khi chd' bidn ehiing thudng dupe tam udp them eae loai gia vi nhu hanh, tdi, gimg, tieu, dt... ,j . ^:^.'
Theo tai lieu ehiing tdi thu thap dupe, bdn canh tac dung tao mui thom, trong thdnh phdn eiia hanh, tdi... cdn chira mdt sd chat ed kha nang sat khudn manh nhu ahxin (C6Hl0OS2) hoac eae chat cay nhu gingerol, shogaol... Trong thue nghidm, allixin ire ehd'hoat ddng nhieu loai vi khuan: B. subtilis, Proteus morgani, S. typhi, S, paratyphi. S. aureus. Shigella dysenteriae, V.
cholera... (Tir didn bach khoa ndng nghidp. Ha Ndi, 1991).
Do dang sir dung truyen thdng eae loai gia vi trong ehe bidn thue pham nhu bdt xay hoac gia dap khd dp dung d quy md ldn, ehiing tdi da nghidn eiiu dieu ehe' dudi dang dieh ehie't de tidn eho vide xir ly mdu. Nguydn lieu sau khi dupe lam saeh, nghien min va bd sung nude theo ty le 1/1 thanh dang bdt nhao dupe Ipe qua 2 ldp vai bong sach, hoac ly tam d tdc dd 3.000vdng/phiit trong 15 phiit de thu dieh ehiet trong (lupng dieh thu dupe bang 1,5lan nguyen lieu ban dau). Kd't qua eho thay dieh ehie't tir hanh, tdi, gimg ed mdu trdng due hoac vang nhat, de lang can trong qua trinh bao quan, ed miii thom dae trung eiia timg loai.
Chiing tdi eung da nghien eiru tach ehiet thanh cdng dieh ehiet hanh, tdi, gimg dudi dang nhua dau hoae tinh dau de ha gia thanh (mua nguyen lieu vdi gia re vao thdi vu thu hoach rd), thuan tien trong bao quan, van chuyen va sir dung. Didu dang tide la tinh ddu hoae nhua ddu gimg, tdi ma ehiing tdi da thu dupe rat khd hoa tan trd lai trong nude khi sir dung (ehi tan trong dung mdi hiin eo nhu edn de pha loang trd lai.
Ket qud lira chgn phuang phdp xu ly mdu thit vjt thi nghiem
Cd 2 phuong phap xir ly mdu thit thi nghiem dupe lira ehpn dd' dp dung la nhung ngap va phun dung dieh axit.
Ke't qua thu nghiem cho thd'y: Phuong phap nhiing ngap loan bp mdu co uu diem la loan bd be mat mdu dupe tiep xiie vdi dung dieh nen hidu qua lam giam sd lupng VSV kha cao.
Tuy nhidn, dp pH eiia dung dieh - mdt trong nhirng tae nhan diet khuan chinh, bi giam rdt nhanh: xudng edn 5,1 ehi sau 2 ldn nhiing mdu. Nguydn nhan eiia hidn tupng nay theo ehiing tdi, mdt phdn la do dung dieh bi lupng nude cdn lai d than thit pha loang, song ehii yd'u la do eae anion bi eae peptit, eae protein eiia mdu kd't hpp va khir mat boat lire theo Robin L. Joseph (1997). Han ehe nay ed the dupe khde phuc bdng each thudng xuydn thay dung dich axit de xir ly mdu, song se ddn den ehi phi Idn do tidu hao nhidu vat tu vd tdn nhan cdng.
Phuong phap phun suong tidu ton mdt lupng dung dich axit nhd hon do dupe phun dudi dang nhirng tia nude nhd va hoat tinh diet khuan eiia nd khdng bi thay ddi khi xir ly mdu. Dudi ap lire eiia tia dung dieh, VSV gay hai ed tren than thit vira bi rira trdi, vira bi axit lieu diet ndn hidu qua xir ly kha cao. Ke't qua thir nghiem xir ly mdu trong thdi gian 30 gidy bdng phuong phap nay eiia ehiing tdi eho tha'y: 1 lit dung dieh dit de xir ly 50 - 70 thdn thit ga (tuy thudc vao thao tae eiia ngudi sir dung binh phun), ndn ehi phi vat tu thdp, khdng lam tang dang kd gid thanh san phdm. Vi nhirng ly do trdn ehiing tdi ehpn phuong phap phun suong de xir ly mdu cho cdc thi nghiem tidp theo. ' " ; • • . /i .. ;., i..
Ket qud thdm dd ty le su dung dung dich axit huu ca vd dich chiet hdnh, tdi, girng dexu ly mdu thit vit thi nghiem
Nam loai vi sinh vat chi diem quy dinh bdt budc da dupe kiem tra dd theo ddi bie'n ddng sd lupng eiia ehiing theo thdi gian bao quan. Mdu thit vit thi nghidm dupe phun dung dieh axit
V ..C ; -C r NGUYIN THAC HOA - Nghien cim sic dung dung dich axit...
b eae ndng dp 0.5 - 1,0 - 1,5 - 2,0%, va dich chidt hanh, tdi, gimg, de rao nude, bao kin trong tui HDPE, bao quan lanh (6-8'C). > D / • .. - .. i .
Ty le sir dung dieh ehiet tir hanh, tdi, gimg dupe lira ehpn trdn eo sd so sdnh hieu lire sat khudn bdng ky thuat lam khang sinh dd tuong irng vdi dung dieh axit axetic 2%. Kd't qua cho thdy dieh ehidi tdi ed tae dung sat khuan manh khdng hd thua kem dung dich axit nay. Do ham lupng alixin ed trong hanh thdp ndn hidu luc sat khudn eiia dieh ehidi tir hanh yeu hon nhieu. Dieu ngac nhien thii vj ngoai du kidn cua chung tdi la hieu lire nay eua dieh chidt tir gimg rat kem. Tir ket qua lam khang sinh dd chung tdi ehpn dich ehiet tdi dd tidn hanh thi nghiem tiep theo.
Mdt trong nhtmg vi sinh vat gay hai thit edn dupe quan tam ddu tidn la nhdm vi khudn hieu khi tdng sd bdi ehiing ed tdc dp nhan ddi the he rat nhanh (20 phiit/the he) va la thii pham chinh gay hdng thit. Theo quy dinh eiia TCVN theo Danh mue tidu chuan vd sinh ddi vdi luong thue, thue phdm - Bd Y te, 1998. Gidi han tdi da nhidm loai vi khudn nay trong thue phdm la 10' CFU/g (< 6Log CFU/g).
Sd lieu kiem tra eho thdy tae dung diet khuan ed khac nhau giira 3 loai dung dieh, trong dd dung dieh axit axetic cho hidu qua cao nhat, dung dieh hdn hpp 2 loai axit d vi tri trung gian, tang theo mite tang ndng dp axit sir dung va deu dat cao nhat d ndng dp 2% (xem bang 2). Kei qua xir ly sd lieu theo ddi trong 10 ngay dau cho thay, tuy hidu qua diet vi khudn nhdm nay cd khde nhau giQ-a 3 loai dung dieh ve gia tri tuyet ddi song chua ed y nghia thdng kd (p>0,05).
Do miie dp nhidm ban ddu loai vi khuan nay trong mdu thi nghiem kha cao (4,2.10*
CFU/g - tuong duong 4,65 Log CFU/g) ndn tuy da dupe bao quan d nhiet dd lanh nhung ehi sau ngay thu" 2 mdu ddi chimg da bi di, va bi hdng d ngay thir 4 (sd lupng vi khudn nay len tdi 3,5.10*^ CFU/g - tuong duong 6,55 Log CFU/g, gdp hang chuc ldn mii'c dd cho phep). Chi tidu nay vdn dat dupe tham chi de'n ngay thir 12 d eae mdu dupe xir ly dung dieh axit axetic 2% va dich ehidi tdi. Bdn nhdm vi khuan cdn lai ddu khdng phat hidn thay, hoac phat hidn dupe nhung vdi sd lupng d mure eho phep
Bang 2: Kha nang ire chd' vi khudn hidu khi tdng sd cua axit axetic, axit lactic, dieh ehidi tdi
• I 'i '' ' trdn mdu thit thi nghidm dupe bao quan lanh Sd luong vi khuan (Log CFU /g)
Dung dich Nong 0 ngay 1 ngay 4 ngay 7 ngay 10 ngay 12 ngay xirly thjt do(%) Mean ±SE Mean ±SE MeanlSE Mean ±SE Mean ±SE MeanlSE Ddi chimg 0,0 4,51±2,15 4.84 ±2,82 6.13 ±.52 * * * Axit axetic 0.5 4,08 ±1,93 4,76± 3,22 5,43± 3,36 * *
1,0 3,76 ±1,57 4,27±2,80 4,97± 2,20 5,74±3,10 * 1,5 3,28 ±1,89 3,85±2,63 4,56±2,21 5,24±2,63 6,03 ±1,75 2,0 3,10 ±1,72 3,42±1,78 4,53± 1,68 4,95± 1,76 5,81±1,63 Axit lactic 0,5 4,66±2,54 5,12±2,83 5,96±3,15 * *
1,0 .''•'•• 4,27±3,12 4,85±2,45 5,84±2,16 6,05± 2,59 * '""^ " ••" 1,5 - V' • : 4,18±2,41 4,53±2,72 5,69± 2,67 5,98± 2,37 *
2,0 4,10 ±1,84 4,45±2,66 5,23 ±3,20 5,76± 3,26 7,33 ±3,74 Hdn hpp 2
loai axit
i ; / ''.It
Djch chiei tdi
0,5
1 , 0 IK : 1,5 i'l.
2,0
4,84± 1,95 : <•• . 4,58±1,74
• ; 1 4,71±2,18 4,32 ±2,27 3,43 ±2,15
4,45±2,51 4,93± 1,95 4,76± 3,22 4,49± 2,58 4,50±3,18
5,66± 2,52 5,33±1,96 4,74± 3,42 4,59 ±3,22 4,92± 3,24
*
5,89± 2,25 5,80± 3,91 5,55±2,77 5,25± 3,08
*
6,37± 2,86 5,48±3,64
VIEN C H A N N U O I - Tap chi Khoa hgc Cdng nghe Chdn nudi - Sd 8 - Thang 10-2007
Ket qud ddnh gid mpt sdchi tieu cdm quan cua mdu thit sau bdo qudn - ' . ^«^ .,~A..
,.;.„ . Nhin chung, khi sir dung dung dich axit lactic va dung dich hdn hpp 2 loai axit dd' xir ly mdu trudc khi bao quan, cac mdu thit thi nghidm it bi thay ddi ve mau sdc, trang thai cung nhu miii ban ddu. Ridng dung dich axit axetic ed de lai miii dae tnmg trdn eae mdu dupe xir ly, ndng dp dung dich cang dam dae thi miii cang rd. Kd't qua nhdn xet cam quan mdu thit dupe bao quan lanh nhu sau: Cac mdu ddi chirng ddn ngay thii 2 eiia qua trinh bao quan vdn edn giir dupe cdc dae tinh eiia thit tuoi (cd mau trdng nga, thit mem, dan hdi, ed miii dae trung eiia thit vit tuoi), nhung ddn ngay thii 4 thi bi hdng (ed miii hdi, nhdt, mat mau tir nhien). Cac mdu dupe xir ly bdng dung dieh axit axetic 0,5% ed thd' bao quan dupe ddn ngay thii 7, edn eae mdu dupe xir ly dung dieh axit lactic va hdn hpp 2 loai axit ed kd't qua kem hon - ehi sau ngay thii 4.
Cac mdu dupe xir ly bdng dung dieh axit axetic 1,0 va 1,5% vdn edn giir dupe mau sdc va mili eiia thit tuoi ddn ngay thir 10, edn eae mdu dupe xir ly dung dieh axit lactic va hdn hpp 2 loai axit kem tuoi hon vdi ndng dp nay ehi keo dai thdi gian bao quan ddn ngdy thii 7.
Chi cac mdu dupe xir ly bdng dung dieh ax axetic vdi ndng dp 2% ed the dam bao duy tri cac tidu ehuan cam quan ddi vdi thit tuoi ddn ngay thiir 12, edn eae mdu dupe xir ly dung dich axit lactic va hdn hpp 2 loai axit ehi bao quan dupe dd'n ngay thir 10. Tdng hpp y kie'n danh gid mdt so ehi tidu cam quan mdu thit dupe xir ly bdng dung dich axit axetic sau 12 ngay bao quan dupe trinh bay d bang 3.
TT
Bang 3 : Kd't qua gia mdt so ehi tidu cam quan cua mdu thit vit sau bao quan Ngudi danh gia Thir Thii Thii Thii Thu" Thir Tdng hpp Chi tidu 1 2 3 4 5 6 (n = 6) 1 Hinh thtic
2 Mau sdc - ''•' 3 Mili
_4 Trang thai (ran, mem)
8 10 9 9
9 9 8 8
9 9 8 9
8 8 7 7
8,5(51/6) 8,9 (53/6) 8,2 (49/6) 8,3 (50/6)
* Mc/K thit tuai dugc ddnh gid theo thang diem 10.
So lieu kd't qua eho tha'y, eae thanh vidn deu danh gid khd cao eae ehi tidu cam quan eiia mdu va eho nhdn xet: mau sdc, miii, trang thai eiia thit it bi thay ddi sau thdi gian bao quan.
Kd't qua nay giiip chung tdi tin tudng vao kha nang trien khai ung dung giai phdp nay trong thue tidn. Ridng eae mdu thit vit dupe xir ly bdng dieh chid't tdi tuy ed ke't qua kim ham sir phat tridn eiia vi khudn gdy hai thit tdt khdng thua kem dung dieh 2% axit axetic song dang tide la tir ngay thir 4 sau bao quan bd mat eiia mdu bdt ddu chuyen mau xam, trdng kem tuoi ndn se khd dupe ngudi tidu diing chap nhan khi thuong mai hda san phdm. - - - -
.-' 1 • - . f - 0
L.^ KET LUAN
Phuong phap phun suong dung dieh axit trong 30 giay la phii hpp de xir ly mdu. Kha nang khang khuan eiia cac dung dieh axit tang ddn theo ndng sir dung va dat hidu qua lot nhat d ty Id 2%. Dung dieh axit axetic ed tae dung diet khudn manh hon dung dich axit lactic va hdn hc)fp 2 loai axit nay d tat ea cdc ndng dp pha loang. - /, r
Mdu dupe xir ly bdng dung dieh axit axetic 2% dupe bao quan lanh (6-8"C) trong tiii HDPE ed the' bao quan dupe 12 ngay ma ehua cd eae bidn ddi ldn ve mau sdc, miii, trang thai so vdi thit tuoi, edn mdu dupe xir ly bdng dung dieh axit lactic 2% va hdn hpp 2% 2 loai axit trdn chi bao quan mdu dupe tdi 10 ngay. .f^i.-
Dieh chid't tdi ed kha nang diet khudn manh khdng thua kem dung dieh axit axetic 2%
song do lam chuydn mau thit de xir ly bao quan ndn se khd dupe ngudi tidu diing chdp nhdn.
> ,^ ^ ?.! ; [SIGUYSN THAC HOA - Nghien cuu sic dung dung dich axit...
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TAILIEU THAM
K H A OCue chan nuoi (2007). Tinh hinh chan nu6i Viet Nam - Tiem nang va phat tri^n.
Danh muc tifiu chuan vd sinh ddi vdi lucfng thuc. thirc pham (1998). Sd 867/1998/ QD-BYT ciia Bp trudng Bo Y te' ngay 04 thang 04 nam 1998.
Kang Seoknam, Jang Aera, Sang Ok Lee (2003). Effect of Organic Acids on Microbial Populations and Salmonella typhimorium in Pork loins. Seoul National University, Korea
Nien giam thong ke nam 2004. Nha xua't ban TCng cue thong ke.
Ouatara B.R. Simart R.E, Holley R.A (1997). Inhibitory effect of organic acids upon meat spoilage bacteria. J.
Food Protocol. 60(3) 868 - 872.
Tir dien bach khoa N6ng nghiep. Ha NOi (1991)
Robin L. Joseph (1997). Meat Decontamination - the State of the Art. The University of Bristol - Ireland.
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