GII THIUTrong nhng nm gn y, cng vi s pht trin ca khoa hc k thut vic ng dng nhng thnh tu cng ngh mi vo thc tin sn xut din ra mnh m v c bc t ph. C th n, s i mi lin tc v cng ngh tr thnh yu t then cht duy tr sc cnh tranh cho cc doanh nghip trn th trng. Cng ngh sn xut Bia cng khng nm ngoi xu hng . L mt mt hng c tnh cnh tranh cao trn th trng ung ni ring cng nh trn th trng tiu th ni chung, cc doanh nghip trong nc hin nay lun tm cch i mi cng ngh nhm gia tng li nhun cho mnh ng thi cng p ng nhng nhu cu ngy cng khc khe t pha khch hng. Sau y l mt phn tng qut ca cng ngh ln men bia.M UBia l mt loi nc ung cha cn c sn xut bng qu trnh ln men ca ng l lng trong mi trng lng v n khng c chng ct sau khi ln men. Ni chung bia l loi nc gii kht c cn thp, bt mn xp v c hng v t trng ca hoa houblon c lm t nguyn liu chnh l malt i mch, hoa houblon, nm men v nc. c bit CO2 ha tan trong bia c tc dng gii nhit nhanh, h tr cho qu trnh tiu ha, ngoi ra trong bia cn cha mt lng vitamin phong ph.NGUYN LIUNc: L thnh phn chnh ca bia ( chim 80 90%) nn thnh phn nc nh hng quan trng n cht lng v c trng ca biaCh tiuYu cu

pH6,5 7,5

cng tng Phi hp hn hp malt go

Giai an 2:Chun b dch ln men

p lc( lc p khung bn) -> Nc gomalt nu 600C+hoa Hublon (15-20g/10lt)

-> lng ( lc b xc hoa Hublon) -> H bng nhit ln men nhit

Giai an 3: ln men

Ln men chnh ( 6-10 ngy 8-130C)

-> Ln men ph(10-35 ngy 3-50C) to hng, to bt, lng trongGiai an 4: thnh phm bo qun

ng thng ( bia hi) -> V chai ( bia chai , bia lon)

-> Thanh trng 700C +Dn nhn, vo kt -> Thnh phm

Qu trnh ln men chnh

L qu trnh chuyn ha cc cht ng v destrin thp phn t trong dch ln men thnh C2H5OH, CO2 v mt s cht hu c khc nh tc dng ca nm men.

Cc sn phm ph(cc este, acid hu c, ru bc cao, aldehyde, glycerin)i vo thnh phn ha tan ca dch ln men.

Mt s thnh phn ha tan b kt ta v lng dn xung cng vi sinh khi ca nm men.

Sau khi cyging vo nc nha ta bt u tnh thi gian ln men. C th chia qu trnh ln men lm 4 giai on:G1 (khong 2 ngy u): nm men ny chi, pht trin mnh dn v sinh khi t cc i cui ngy th hai.

G2 (2 ngy k tip) s ln men chuyn t kiu ln men hiu kh( tng sinh khi nm men) sang ln men k kh( to CO2 v ethanol)

G3 (2 3 ngy tip theo) thi k ln men mnh nht.

G4 (1 2 ngy cui cng) cng ln men yu dn) sinh khi nm men tng cng vi cc thnh phn keo t ca protein, tanin, nha ng hoa houblon lng dn xung y thng ln men.Qu trnh ln men ph

Mc ch: Tip tc ln men phn cht kh cn st li sau ln men chnh, bo ha CO2 v tng cng mi v cho bia, thc hin qu trnh chn ca bia(n nh cht lng bia), lm trong bia; a bia v nhit thp hn ch s xm nhp v ph hy ca vi sinh vt.

Thi gian ln men ph: 15 35 ngy.Bi tiu lun

Cng ngh vi sinh ln men bia

Sinh vin thc hin: Trn Qu c

Gio vin hng dn: Nguyn Th Thu Thy