Cn Sx Banh Pizza Dong Lanh

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I HC QUC GIA THNH PH H CH MINH TRNG I HC BCH KHOA

KHOA K THUT HA HC B MN CNG NGH THC PHM

BKTP.HCM

Bo Co Tiu Lun Cng Ngh Ch Bin ng, Bnh, Ko:

PIZZA NG LNH

GVHD: ThS. Trn Th Thu Tr

Nhm thc hin:

ng Minh t 60700484

Trn Ch Hi 60700686

Trng Vnh Lc 60701383

Tp HCM, Thng 6/2011

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LI M U

Trong cuc sng cng nghip ngy nay, thi gian dnh cho n ung ca con ngi ngy cng b b hp. V vy, cc

sn phm thc n nhanh ngy cng chim lnh trn th trng. Tuy nhin, nu nh mt bui ti i lm v cc ca hng u ng ca, m bn li mun n bnh pizza, mt sn phm c trng cho nc , th bn nn ngh n chic bnh pizza ng lnh trong t lnh. Ch cn cho vo l vi sng, i vi pht v bn c ngay mt chic bnh pizza thm phc. Nhng tnh nng u im lm cho sn phm pizza ng lnh ngy

cng ph bin trn th trng, c bit l cc nc phng Ty. Tuy nhin Vit Nam, sn phm ny c kh l hn ch.

Trong ni dung mn hc, nhm xin c gii thiu cho c v cc bn v lch s hnh thnh cch thc lm nn mt chic bnh pizza ng lnh, cng nh l thnh phn dinh dng trong .

Do mi nghin cu sn phm ny ln u, nn nhng

thiu st l khng th trnh khi. Rt mong nhn c s gp

ca ca c v cc bn bi bo co c hon thin.

Chn thnh cm n c v cc bn!

Nhm thc hin

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MC LC: LI M U ................................................................................................................................. ii

MC LC: .................................................................................................................................... iii

Danh mc hnh: ............................................................................................................................... v

Danh mc bng: ............................................................................................................................. vi

1. Gii thiu chung v bnh pizza................................................................................................... 1

1.1. Lch s pht trin .................................................................................................................. 1

1.2. Phn loi: Theo hnh dng ................................................................................................... 2

Pizza tonda ............................................................................................................................. 2

Pizza al taglio ........................................................................................................................... 2

Pizza alla pala .......................................................................................................................... 3

1.3 Th trng tiu th ................................................................................................................ 3

2. Nguyn liu: ................................................................................................................................ 4

2.1. Bt ........................................................................................................................................ 4

2.2. Ph mai cng ........................................................................................................................ 5

2.3. St c .................................................................................................................................... 5

2.4. Yeast ..................................................................................................................................... 7

2.5. Ph gia .................................................................................................................................. 8

2.6. Cc loi topping: a dng, tu theo tng loi bnh .............................................................. 8

3. QUY TRNH CNG NGH: ..................................................................................................... 9 4. GII THCH QUY TRNH CNG NGH.............................................................................. 10

4.1. Nho trn ............................................................................................................................ 10

4.1.1. Mc ch: ................................................................................................................ 10

4.1.2. Trnh t nho trn ................................................................................................... 10

4.1.3. Thng s: ................................................................................................................ 10

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4.1.4. Thit b: ................................................................................................................... 10

4.2. Cn .................................................................................................................................... 10

4.2.1. Mc ch: ..................................................................................................................... 10

4.2.2. Thit b:........................................................................................................................ 10

4.3. Ct to hnh: ...................................................................................................................... 10

4.3.1. Mc ch: to hnh dng sn phm .............................................................................. 10

4.3.2. Thit b: trc ct nm ngang, c cc cnh nh ra ct lp bt nho thnh cc ming trn. ........................................................................................................................................ 12

4.4. Nng: ............................................................................................................................... 12

4.4.1. Mc ch: to cu trc sn phm ................................................................................ 12

4.4.2. Thng s: ..................................................................................................................... 12

4.4.3. Thit b: nung dng hm ............................................................................................ 12

4.5. B sung nguyn liu ph .................................................................................................... 12

4.6. Lnh ng:.......................................................................................................................... 12

4.6.1. Mc ch ...................................................................................................................... 12

4.6.2. Phng php lnh ng: thi kh cung bc ............................................................... 12

4.6.3. Thng s k thut: ........................................................................................................ 12

4.6.4. Thit b:........................................................................................................................ 12

4.7. Bao gi: ............................................................................................................................. 13

4.7.1. Mc ch: hon thin sn phm ................................................................................... 13

4.7.2. Thit b bao gi: ........................................................................................................... 13

6. Nghin cu gn y: .............................................................................................................. 15

6.1. Phi trn cht x ha tan cao vo bt m: .................................................................. 15

6.2. p dng bo qun kh quyn iu chnh bo qun bnh pizza: ............................ 17 6.3. Bao b thng minh trn pizza ng lnh: .................................................................... 18

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7. Kt lun: .................................................................................................................................... 18

8. Ti liu tham kho: ................................................................................................................... 19

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Danh mc hnh: Hnh 1: Sn phm pizza v quc k nc .................................................................................... 1 Hnh 2: Pizza al taglio .................................................................................................................... 3

Hnh 3: Pizza alla pala ................................................................................................................... 3

Hnh 4: Cheddar cheese.................................................................................................................. 5

Hnh 5: Mozzarella cheese.............................................................................................................. 5

Hnh 6: tomato sauce ...................................................................................................................... 6

Hnh 7: Cc loi nguyn liu trn b mt pizza.............................................................................. 8

Hnh 8: S quy trnh cng ngh sn xut pizza ng lnh. ....................................................... 9

Hnh 9: Thit b nho trn ............................................................................................................ 10

Hnh 10: thit b cn bt ............................................................................................................... 10

Hnh 11: Thit b ct ..................................................................................................................... 12

Hnh 12: Thit b nng................................................................................................................ 12

Hnh 13: Thit b lnh ng thi kh cng bc. .......................................................................... 12

Hnh 14: Thit b ng gi ............................................................................................................ 13

Hnh 15: Sn phm DiGiorno Rising Crust lnh ng ................................................................ 13

Hnh 16: Sn phm Red Baron Frozen Pizza - 4 meat lnh ng. ............................................... 14

Hnh 17: Sn phm California Pizza Kitchen Crispy Thin Crust BBQ Chicken Pizza lnh ng 14 Hnh 18: S tin hnh th nghim ............................................................................................ 15

Hnh 19: nh gi cm quan cht lng ca bnh pizza c lm t bt nho c bo qun 1 ngy. .............................................................................................................................................. 17

Hnh 20: nh gi cm quan cht lng ca bnh pizza c lm t bt nho c bo qun 30 ngy. .............................................................................................................................................. 17

Hnh 21: Thi gian bo qun i bnh pizza khi p dng kh quyn iu chnh ......................... 18

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Danh mc bng: Bng 1: Thnh phn ho hc c bn ca pizza (100g) ................................................................... 4

Bng 2: Ch tiu cm quan ca tng c chua: ............................................................................... 6

Bng 3: Ch tiu ho l ca tng c chua ..................................................................................... 6 Bng 4: Ch tiu vi sinh ca tng c chua .................................................................................... 7

Bng 5: Ch tiu ca nm men p ................................................................................................... 7

Bng 6: Ch tiu ca nm men kh ................................................................................................. 7

Bng 7: Thnh phn ca bnh pizza DiGiorno Rising Crust lnh ng (1/6 ci bnh pizza) ...... 13

Bng 8: Thnh phn ca bnh pizza Red Baron Frozen Pizza - 4 meat lnh ng: ..................... 14

Bng 9: Thnh phn ca bnh California Pizza Kitchen Crispy Thin Crust BBQ Chicken Pizza lnh ng (tnh trn 1 g sn phm) ............................................................................................... 14

Bng 10: thnh phn ha hc ca khi bt nho c b sung thm cht x ha tan cao: ......... 16

Bng 11: nh hng ca thi gian bo qun - 18oC ln m ca cc sn phm bt nho pizza:....................................................................................................................................................... 16

Bng 12: nh hng ca thi gian bo qun lnh ng -18 oC ln hm lng tinh bt tng ca cc sn phm bt nho: ................................................................................................................. 16

Bng 13: nh hng ca thi gian bo qun ln cu trc(cm) ca cc khi bt nho ................ 16

Bng 14: nh hng ca thi gian bo qun ln pH ca cc khi bt nho: ............................... 17

Pizza ng lnh GVHD: Th.S Trn Th Thu Tr

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1. Gii thiu chung v bnh pizza

1.1. Lch s pht trin

Trc ht l ngun gc ca tn gi "pizza". T pie m chng ta bit khng phi mang ngha l mt ming bnh, cng khng phi tng trng cho hnh dng ca n. M pie c lin quan n magpie (chim chch cho). Nhng ngi La M gi chng l pica, v pie kt hp cng pica tr thnh pizza nh chng ta vn thng gi ngy nay. Ci tn lin quan n loi chim chch cho, nhng con chim c hai mu lng vn thng tha rt nhiu nhng th lnh knh v t ca chng ging nh nhng chic bnh pizza, loi bnh c lm bi nhiu thnh phn khc nhau vi cc loi bt, cc loi gia v, cc loi rau, tht v c.

Lch s pizza bt ngun t thi k tin s vi bt m nng trn nhng phin phng l v nng. 1000 nm trc, chic bnh vi l thm v gia v c rc ln trn tm bt m nho hnh trn xut hin ph bin ti Naples, . Mi u, ngi ta n nhng chic bnh ny nh l mt mn khai v hoc n nhanh.

Tuy nhin c mt s ti liu khc li cho rng, chic pizza xut hin u tin li l Hy Lp, nhng ngi lm nhng chic bnh hnh trn, to v mng bng bt m, ngi ta cho du liu, gia v, khoai ty v mt s th khc ln . C chua cha c s dng v .. cha c vo thi im . Cho n cui th k 16, khi m nhng ngi chu u tm cch vt qua s s hi ca mt khm ph mang tnh t bin ca th gii mi: nhng qu c chua. Ngun gc t Peru v Ecuador, loi cy trng cho ra mt th qu mu vng hoc - m sau ny ngi ta vn gi l c chua, ra mt i lc Chu u xa l vo u th k th 15. c nhng chin binh ngi Ty Ban Nha mang t Chu M v, qu c chua b nghi ng l mt loi qu c v b soi mi bi nhng nh mt e d y hoi nghi. Vo cui th k 16, ngi Chu u mi bt u bit n c chua. Nhng ngi ngho vng Naples, , nui sng mnh bng nhng chic bnh m, l mt trong nhng ngi u tin cho c chua vo nhng chic bnh m hnh trn ca h.

Hnh 1: Sn phm pizza v quc k nc

(http://washingtoncountyregiment.files.wordpress.com/2010/06/margarita-pizza.jpg)


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Pizza kiu hin i khai sinh nm 1889 khi n hong Margherita Teresa Giovanni, hong hu ca Vua Umberto nht nc n thm Naples. Raffaele Esposito, ch qun ru Pietro Il Pizzaiolo, c yu cu chun b lm mt mn n c bit n tip hong hu. Esposito lm mt chic bnh pizza vi c chua, pho mt mozzarella ( mt thnh phn cha bao gi c s dng trc lm pizza c lm t sa tru) v hng qu, nhng thnh phn to nn ba mu , trng v xanh l cy tng trng cho l c . ng t tn cho chic pizza l Margherita Pizza. T tr i, pizza c bit v bn rng ri trn ton nc . Nhng vng khc nhau li c nhng tng khc nhau cho chic bnh ca h. Ngi dn Bolgona bt u thm tht ln trn chic bnh. Chic bnh pizza ca ngi Naples tr nn ph bin, bt u c ti v pho mt vn cng vi rau thm, rau ti v nhng gia v khc lm nhn bnh.

1.2. Phn loi: Theo hnh dng

Pizza tonda

c c 1 chic bnh pizza tonda (pizza trn) hon chnh phc v khch hng th phi tri qua nhiu cng on theo trnh t v bao gm y cc thnh phn , bnh pizza c lm di hnh dng trn 1 mt bnh tip xc vi l nng , y l hnh dng bnh rt ph bin vi c pizza c in hay pizza napoletana.trn mi mt vng min ca th phong cch nu n li mang c trng ring,s c bit ca cc mn n ca vng Napoli gip cc mn n ca vng ny tr nn v cng ni ting, v thnh ph Napoli cng ng mt vai tr rt quan trng vi s hnh thnh v pht trin rng ri ca mn bnh pizza ra ton th gii. V cng l l do ti sao ngi ta dung t pizza napoletana (pizza ca vng Napoli) ch Pizza trn mc d v tnh cht li c nhiu im khc bit nhau so vi kiu pizza truyn thng Napoli.

c bit ngoi nc cch lm bnh pizza cng c nhiu khc bit, c th nhiu cht bo hn hay ngt hn, hay gia gim cc loi gia v khc nhau theo khu v ca tng a phng. to hnh bnh th ngi ta c th dng dng c cn bt mng ra, tt hn l dng tay ko bt v dn u bnh trn khng. Cc chuyn gia lm bnh pizza thng s dng phng php th 2 , gi l pizzaioli acrobatici

Pizza al taglio

lm c 1 chic pizza al tagio hoc pizza b khay th ta phi dng ti 1 ci khay ln c th hnh trn hoc hnh ch nht nng, lsau khi ra l bnh s c ct bn theo yu cu ca khch hng. Phin bn pizza ny thng c bn cc pizzeria, hay ti cc tim bnh m. lm loai bnh ny ta phi dung nguyn liu c hm nng cn thit , nho bt vi t l nc nhiu hn v tri qua qu trnh ln men trong iu kin thch hp to ra loi bnh c hng v c bit. Loi bnh pizza ny c nh gi l rt kinh t v pizza c bn theo trng lng (phng thc bn bnh ny rt ph bin Roma).


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Hnh 2: Pizza al taglio

(http://ipreferparis.typepad.com/.a/6a00d83451b0bd69e2011570a26a5c970b-pi)

Pizza alla pala

Pizza alla pala (hnh mi cho ,hnh bu dc) , tng t nh pizza b khun , l 1 pizza ln v c bn theo trng lng nhng va chn ti , tng t nh pizza trn, pizza cng c nng tip xc trc tip vi l nng.

Hnh 3: Pizza alla pala

(http://2.bp.blogspot.com/_YTJk1ROpcJE/SdQzszIMh6I/AAAAAAAAEFc/364p2ItSu9k/s320/IMG_2766.JPG)

1.3 Th trng tiu th Hin nay, vi doanh s tiu dng khong 37 t USD (tng ng 685 t VN), M

ang l th trng tiu th bnh pizza ln nht th gii. V vi doanh s c tnh 2.1 t USD


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(tng ng 39 t VN) trong nm 2009, Kraft Foods ang ng u v ngnh hng kinh doanh bnh pizza ng lnh v t tng trng mc cao ti M v Canada.

2. Nguyn liu:

Bng 1: Thnh phn ho hc c bn ca pizza (100g)

2.1. Bt Pizza lm sn phm tng t bnh m, ch bin t bt m nho vi nc, mui v nm

men, sau c nng cho chn. Ngi dn cc nc pht trin c bit l phng ty dng pizza nh l mn n quen thuc v s a dng v tin dng ca n. Pizza c nhiu cng thc ch bin tu theo tng quc qua hay nh sn xut nhng thnh phn quan trong vn l bt, nm men, st c, cc loi ph mai

Bt m lm bnh pizza, ngoi ch tiu cht lng chung v sinh l, ho l cn tho mn cc yu cu cng ngh gm lc n tt v kh nng sinh kh cao. Pizza c cht lng bt cao hn hn so vi bnh m, hm lng protein t 12 and 14% hm lng protein (Stauffer, USA, 1993) cn theo xut ca chu u l 12.5% protein vi khong 30% gluten t (Brummer, European, 1995).

Protein ca bt m gm c bn nhm chnh: albumin, globulin, gliadin, glutenin. Trong , ch yu l gliadin v glutenin, chim khong 75 95 %. Chnh hai nhm ny khi nho void nc to thnh mng phn b u trong khi bt nho to dai v n hi, c tc dng gi kh khi khi bt nho n v c gi l gluten.

Gliadin v glutenin tng th cng gp phn tng n ca bnh. tng cht lng gluten khi no bt c th b sung cc cht oxi ha nh: acid ascorbic,

kali bromat, ngc li nhng cht kh s lm gim cht lng gluten.


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2.2. Ph mai cng Trong sn xut pizza thng s dng hai loi ph mai cng/ bn cng l: Mozzarella

cheese v Cheddar cheese. Ph mai Mozzarella l mt loi ph mai ti thng dng thng c s dng lm nhn pizza, nng cng bnh m hoc ch bin cng cc mn m . T l Mozzarella cheese v Cheddar cheese l 80:20 (khong 120 g/pizza)

Hnh 4: Cheddar cheese (http://images.pictureshunt.com/pics/s/shredded_cheddar_cheese-9386.jpg)

Hnh 5: Mozzarella cheese (http://www.dinhduong.com.vn/files/u19/Phomat_Mozzarella.jpg)

2.3. St c Cng dng: to hng v v mu sc cho bnh pizza Lng dng: 40g (3 tha canh) cho 1 bnh khong 120g


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Hnh 6: tomato sauce (http://ninecooks.typepad.com/photos/uncategorized/tomatosauce.jpg)

Ch tiu cht lng (theo TCVN 7398:2004):

Bng 2: Ch tiu cm quan ca tng c chua:

Bng 3: Ch tiu ho l ca tng c chua


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Bng 4: Ch tiu vi sinh ca tng c chua

2.4. Yeast Cc dng bnh men s dng trong sn xut bnh m : men p, men kh, men lng v men

chua. Men p v men kh c sn xut t nh my chuyn sn xut nm men. Men lng v men chua thng c chun b ngay trong nh my sn xut bnh m. nc ta, cc x nghip sn xut bnh m thng dng cc dng men kh nhp ca nc ngoi, mt s x nghip t chun b c men lng, cn men chua th khng dng.

Nm men p :

Bng 5: Ch tiu ca nm men p Tn ch tiu Gi tr

m 7475 % chua


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c th cho trc tip nm men p vo bt nho m khng cn ha trong nc. Nhit ca nc ny cng rt quan trng trong vic kim sot nhit khi bt nho.

Chc nng chnh ca nm men l sinh kh CO2 lm tng th tch khi bt nho do trong qu trnh ln men xy ra iu kin ym kh theo phn ng:

C6H12O6 = 2C2H5OH + 2CO2 + Q Do kh nng ln men ca nm men to CO2 ty vo cht lng nm men nh tui

sinh l ca nm men ( thng dng nm men cui pha sinh trng u pha cn bng), mt t bo/1 n v , tinh sch ca sinh khi nm men...

2.5. Ph gia Nc: tc nhn ho do NaCl: to v, lm cht gluten, tc ng ln VSV v enzyme trong bt nho ng: to v, mu sc v c cht cho nm men Bt sa gy: to v, mu sc, m pH

Tc nhn oxy ho (KBrO3, (NH4)2S2O8, acid ascorbic): tng th tch v xp ca bnh, tng trng, lm cht mng glutenLiu lng : 0,001-0,005%

2.6. Cc loi topping: a dng, tu theo tng loi bnh

Hnh 7: Cc loi nguyn liu trn b mt pizza (http://i196.photobucket.com/albums/aa206/nahblog/Pasta-Seafood02.jpg)


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3. QUY TRNH CNG NGH:

.

Hnh 8: S quy trnh cng ngh sn xut pizza ng lnh

Nguyn liu

Nho trn

Cn

Ct

Lnh ng

Thm nguyn liu ph

Bao gi

Nng

Sn phm

Nguyn liu ph

Bao b


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4. GII THCH QUY TRNH CNG NGH 4.1. Nho trn

4.1.1. Mc ch: o To khi bt nho ng nht o Hnh thnh khung mng gluten

4.1.2. Trnh t nho trn o Bt m c nho trn chung vi

nuc,ng,mui,sa,du oliu o Mt phn bt m c ho chung vi

nm men ri sau b sung vo khi bt nho

4.1.3. Thng s:

o Thi gian nho trn:4pht/m o Nhit nho trn:300C

4.1.4. Thit b:

Hnh 9: Thit b nho trn (http://alibaba.com)

4.2. Cn

4.2.1. Mc ch:

Chun b cho qu trnh ct to hnh

4.2.2. Thit b:

Hnh 10: thit b cn bt (http://alibaba.com)

4.3. Ct to hnh:

4.3.1. Mc ch: to hnh dng sn phm


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4.3.2. Thit b: trc ct nm ngang, c cc cnh nh ra ct lp bt nho thnh cc ming trn.

Hnh 11: Thit b ct (http://alibaba.com)

4.4. Nng: 4.4.1. Mc ch: to cu trc sn phm

4.4.2. Thng s:

Nhit 250 oC.

Thi gian 2 pht.

4.4.3. Thit b: nung dng hm

Hnh 12: Thit b nng (http://alibaba.com)


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4.5. B sung nguyn liu ph Mc ch:

Hon thin,tng gi tr dinh dng v cm quan cho sn phm

4.6. Lnh ng:

4.6.1. Mc ch

Bo qun:dit vi sinh vt

4.6.2. Phng php lnh ng: thi kh cung bc

4.6.3. Thng s k thut:

Nhit :-18oc

Thi gian:20 pht

4.6.4. Thit b:

Hnh 13: Thit b lnh ng thi kh cng bc. (http://alibaba.com)


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4.7. Bao gi:

4.7.1. Mc ch: hon thin sn phm

4.7.2. Thit b bao gi:

Hnh 14: Thit b ng gi (http://alibaba.com)

5. Sn phm:

Hnh 15: Sn phm DiGiorno Rising Crust lnh ng

Bng 7: Thnh phn ca bnh pizza DiGiorno Rising Crust lnh ng (1/6 ci bnh pizza)


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Hnh 16: Sn phm Red Baron Frozen Pizza - 4 meat lnh ng.

Bng 8: Thnh phn ca bnh pizza Red Baron Frozen Pizza - 4 meat lnh ng:

Hnh 17: Sn phm California Pizza Kitchen Crispy Thin Crust BBQ Chicken Pizza lnh ng

Bng 9: Thnh phn ca bnh California Pizza Kitchen Crispy Thin Crust BBQ Chicken Pizza lnh ng (tnh trn 1 g sn phm)


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Ty loi sn phm m s c cc ch tiu cm quan nh mu sc v mi v c trng, khng c VSV gy bnh. Vi mi loi pizza lnh ng cng c thnh phn dinh dng khc nhau, s khc bit ny ch yu l do cc nguyn liu ph c thm vo. Bn trn l thnh phn dinh dng ca mt vi sn phm c mt trn th trng (Bng 7, Bng 8, Bng 9)

6. Nghin cu gn y:

6.1. Phi trn cht x ha tan cao vo bt m:

Emperatriz Pacheco de Delahaye, Paula Jimenez, Elevina Perez (2005) nghin cu khi b sung thm bt cm go c hm lng x ha tan cao vo bt m vi hm lng ln lt l 0%, 5% v 10% cht x ha tan cao.

Hnh 18: S tin hnh th nghim Kt qu:


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Thi gian bo qun lnh ng cng lu th m cng gim, hm lng tinh bt tng gim, cu trc cng gim theo. Tuy vy, pH khng b thay i r rt.

Bng 10: thnh phn ha hc ca khi bt nho c b sung thm cht x ha tan cao:

Bng 11: nh hng ca thi gian bo qun - 18oC ln m (%) ca cc sn phm bt nho pizza:

Bng 12: nh hng ca thi gian bo qun lnh ng -18 oC ln hm lng tinh bt tng (%) ca cc sn phm bt nho:

Bng 13: nh hng ca thi gian bo qun ln cu trc (cm) ca cc khi bt nho


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Bng 14: nh hng ca thi gian bo qun ln pH ca cc khi bt nho:

Sau , tin hnh nng v nh gi cm quan cht lng bt nho thu c sau 1 , 30 ngy bo qun lnh ng, ta nhn thy rng cht lng ca mu bt nho c b sung thm hm lng x ha tan 5% cho cht lng tt hn so vi cc loi cn li.

Hnh 19: nh gi cm quan cht lng ca bnh pizza c lm t bt nho c bo qun 1 ngy.

Hnh 20: nh gi cm quan cht lng ca bnh pizza c lm t bt nho c bo qun 30 ngy.

6.2. p dng bo qun kh quyn iu chnh bo qun bnh pizza:

P.Sign v Goyal (2011) khi nghin cu kt hp qun bo lnh v kh quyn iu chnh th ta nhn thy rng, vi thnh phn ca kh quyn iu chnh l 100 % CO2 (2 atm) s cho cht


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lng sn phm bnh pizza l cao hn so vi phng php iu chnh khc nh N2 100% (4atm), 50% CO2 : 50% N2 (3 atm) v bo qun kh thng thng (1 atm). ng thi, thi gian bo qun l tt hn ko di n 45 ngy. So vi cc sn phm thng thng l 15 ngy.

Hnh 21: Thi gian bo qun i bnh pizza khi p dng kh quyn iu chnh

6.3. Bao b thng minh trn pizza ng lnh:

Michael Schneider and Alexander Kroner (2008) tin hnh thc nghim ha ng dng bao b thng minh trn sn phm pizza ng lnh. Bng phng php ny, ngi tiu dng c th xem c nhng thng tin trn sn phm, thi hn s dng cn li ca sn phm bng cch iu tra trn mt my tnh in t. Song song , ngi ta cn c th kim tra c vng i ca sn phm.

7. Kt lun: Pizza ng lnh l mt trong nhng sn phm kh thnh hnh trong x hi hin nay ti cc nc phng Ty. C kh nhiu thng hiu cho sn phm ny t chng minh ng cp ca mnh i vi ngi tiu dng. Mt trong nhng u im ca sn phm ny chnh l chnh tin li ca n.


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Bn cnh qui trnh cng ngh c xut bn trn, cng tn ti mt quy trnh sn xut pizza ng lnh khc l sau khi bt nguyn liu c nh lng xong s c vo trn v p thnh tng ming bnh ring l. D nhin cht lng sn phm ny s khc so quy trnh trn. Cu trc khung mng gluten khng tt bng, bnh c to ra s n hn nhiu.

Khng dng li , theo mt s nghin cu ci thin cht lng ca bnh pizza ng lnh ngi ta c th b sung thm gum v protein concentrate vi chc nng chnh l gi nc, hn ch s hnh thnh cc tinh th trong qu trnh lnh ng, cu trc khung mng gluten s bn hn.

8. Ti liu tham kho: [1]. L Vn Vit Mn, Li Quc t, Nguyn Th Hin, Tn N Minh Nguyt, Trn Th Thu Tr (2010), Cng Ngh Ch Bin Thc Phm, NXB HQG Tp.HCM, 1019tr. [2]. Y. H. Hui et al (2004), Hand book of frozen food, Marcel Dekker, Inc., NY, U.S.A., 707pages. [3]. Preeti Singh, Ali Abas Wani, G. K. Goyal (2011), "Quality of Chilled Ready-to-Bake Pizza Stored in Air and under Modified Atmospheres: Microbiological and Sensory Attributes", Food Sci. Biotechnol. , Vol.20[1], pp: 1-6. [4]. Preeti Singh, Ali Abas Wani v Gyanendra K. Goyal (2010), Shelf-Life Extension of Fresh Ready-to-Bake Pizza by the Application of Modified Atmosphere Packaging, Food Bioprocess Technol. [5]. Emperatriz Pacheco de Delahaye, Paula Jimenez, Elevina Perez (2005), Effect of enrichment with high content dietary fiber stabilized rice bran flour on chemical and functional properties of storage frozen pizzas, Journal of Food Engineering, 68,17. [6]. P. Singh v G.K. Goyal (2011), combined effect of refrigeration and, modified atmosphere packaging on the Shelf Life of Ready-to-Serve Pizza: Biochemical and Sensory Attributes, American Journal of Food Technology, 6(3), 202 214. [7]. Jeffrey Moore, Marla Luther, Zhihong Cheng, And Liangli (Lucy) Yu (2009), Effects of Baking Conditions, Dough Fermentation, and Bran Particle Size on Antioxidant Properties of Whole-Wheat Pizza Crusts, J. Agric. Food Chem., 57, 832839.

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Cn Sx Banh Pizza Dong Lanh