lactase và ứng dụng
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Nui cy Aspergillus Oryzae thu nhn Lactase - ng dngGVHD: PGS.TS Nguyn Thy Hng Nhm thc hin: on Ngc Mai Sng Phm Th Thanh Thy Nguyn Dng Ngc Lin Trn Trung Hiu
NI DUNG1. Lactose v enzyme Lactase2. Gii thiu v Aspergillus Oryzae 3. Nui cy A.oryzae thu nhn Lactase 4. ng dng ca Lactase
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LACTOSEC IMCng thc phn t C12H22O11
Phn t khiHnh dng Khi lng ring Nhit nng chy
342.30 g/molTinh th mu trng 1.525 g/cm3 202.8 oC 668.9 oC 21.6 g/100 ml3
Lactose Nhit si tan/ nc
ENZYME LACTASE
b galactosidase (cn gi l Lactase) l enzyme thy phn ng lactose to thnh ng glucose v ng galactose.
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ENZYME LACTASE
NI DUNG
NI DUNG1. Lactose v enzyme Lactase2. Gii thiu v Aspergillus Oryzae 3. Nui cy A.oryzae thu nhn Lactase 4. ng dng ca Lactase
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Chng Aspergillus oryzaeAspergillus oryzae l 1 dng nm si Chi Aspergillus H Trichocomaceae B Plectascales Lp Ascomycetes.
A. oryzae tit ra mi trng cc enzyme thy phn nh pectinase, xylanase, cellulase, b galactosidase,khi sng trn mi trng c ngun c cht tng ng: pectin, xylan, cellulose, lactose,...
A. oryzae c ng dng rng ri trong: Trong cng ngh sn xut thc phm: nc tng, miso, ru sake. Trong cng ngh sn xut enzyme: cellulase, amylase, protease, hemicellulase v b galactosidase.
Cc loi thc phm
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Cc loi enzyme sn xut t A.oryzae
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Nm 2001, b gene di truyn ca A. oryzae c phn tch v gii m. H gene gm 8 nhim sc th vi 12 ngn gene v 37 triu cp base(Galagan et al., 2005, Machida et al., 2005)
NI DUNG
NI DUNG1. Lactose v enzyme Lactase2. Gii thiu v Aspergillus Oryzae 3. Nui cy A.oryzae thu nhn Lactase 4. ng dng ca Lactase
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SN XUT CH PHM ENZYME VSV ging Nhn gingNui cy[Chm] [B mt]
Ch phm enzyme th Tinh ch
Enzyme tinh khit
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Phng php nghin cuTuyn chn s b 3 chng sinh tng hp Lactase tt MT thch lactose vi ch th X-gal
Nui cy Sinh Tng hp Lactase Ln men chm My lc trn 200v/ph - pH 7 - 30oC - sau 48h
nh lng hot Lactase Tt nht A.oryzae 3 : enz ni bo 307,5 mU/g Thy phn oNPG Galactose + oNP (vng)21
NGUYN VT LIU MI TRNG GI GING PDA Glucose 20g Agar 20g Dch chit khoai ty 1 lit pH 7 MI TRNG HOT HA Lactose 20g Peptone 3g KH2PO4 1g NaNO3 0,5g KCl 0,5g H2O 1 lit22
TUYN CHN S BHot b - galactosidase Chng Vi sinh vt Ngoi bo (mU/ml) Ni bo (mU/g)
A.oryzae 1
8,96
70,3
Chng A. oryzae 3 c la chn nghin cu A.oryzae 2 9,84 81,87 thu nhn enzyme ni boA.oryzae 3 21,24 307,5
Hot b galactosidase ca 3 chng A.oryzae sau 48 gi nui cy 23
PHNG PHP NUI CY CHM
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LA CHN MI TRNG LN MENMi trng Thnh phn Lactose(g) Peptone(g) Cao nm men(g) (NH4)2SO4(g) KH2PO4(g) K2HPO4(g) MgSO4(g)
MT110 10 10 5 3 1 0.5
MT240 0 1 5 3 1 0.5
MT35 0 5 3 5 0 0.4
MT4
Mi trng Lactose c bn
CaCO3(g)H2O(ml) pH
01000 7
0.21000 6
01000 725
KHO ST KH NNG SINH TNG HP LACTASEThi gian (gi) Mi trng
pH dch nui cy v hot b - galactosidase (mU/g)24 36 48 60 72
pH6,76
mU/g0
pH7,62
mU/g111,61
pH8,22
mU/g367,01
pH8,20
mU/g529,47
pH8,45
mU/g128,58
MT1
MT2
6,15
Chn6,01 120,88 6,17 194,44 5,72 nui cy MT4 lm mi trng 285,34 5,98 00 6,88 45,32 7,05 165,00 6,76 180,01 6,88
169,02
MT3
6,79
277,4
MT4
6,20
43,57
6,53
264,13
6,79
398,61
6,78
507,00
6,78
738,8026
NH HNG CA NGUN CARBONThi gian (gi) Ngun Carbon (g/l)
Hot galactosidase ( mU/g)
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36
48
60
72
LactoseSaccarose
45.160
257.000
406.512.01
592.9635.47
729.3433.48
MaltoseGlucose Galactose
00 16.87
34.2626.64 136.69
37.4531.37 254.69
22.5950.55 36.84
23.1916.23 10.52
Hot b galactosidase khi nui cy A.oryzae 3 trn mi trng c ngun 27 Carbon khc nhau
Nng LactoseThi gian (gi) N. Lactose (g/l)
Hot galactosidase ( mU/g)24 44.36 56.72 96.14 89.7136 48
60 456.34 558.41 686.04 691.05
72 612.54 797.07 829.43 976.74
15 20 25 30
248.52 210.57 293.19 354.89
398.35 379.24 411.39 517.13
35
77.00
226.31
417.88
518.16
787.75
nh hng ca nng lactose n kh nng sinh tng hp galactosidase
nh hng ngun NitThi gian (gi)Ngun Nit (g/l) 24 Hot galactosidase ( mU/g)
36
48
60
72
2g peptone + 1g (NH4)2SO4
111.81
225.48
311.73
643.00
931.41
2g peptone + 1g NH4NO33g cao nm men 3g peptone
113.3356.28 65.82 34.02
346.62175.84 177.48 61.53
529.63220.81 231.87 82.50
727.11351.33 561.87 108.75
1017.60537.00 815.00 165.82 29
Hot galactosidase khi nui cy A.oryzae 3 trn mi trng c ngun nit khc nhau
3g NH4NO3
nh hng nng NitThi gian (gi) Ngun Nit (g/l) 0.5g peptone + 0g NH4NO3 24 Hot galactosidase ( mU/g) 36 48 60 72
67.02
136.73
333.01
451.74
674.61
1g peptone + 0.5g NH4NO32g peptone + 1g NH4NO3
182.02119.22
481.26328.70
627.96548.10
994.83781.26
1311.801008.71
3g peptone + 1.5g 103.33 304.66 490.68 692.08 969.25 NH4NO3 Chn ngun v nng Nit: 1g peptone + 0,5g NH4NO3 4g peptone + 2g NH4NO3
90.62
176.24
390.42
683.93
828.3830
MI TRNG 4
Thnh phn Lactose Peptone NH4NO3 KH2PO4 MgSO4 KOH H2O 30g 1g 0,5g 1g 0,5g 0,5g 1000ml31
nh hng pH uThi gian (gi) pH u
Hot galactosidase ( mU/g)24 89.80 79.99 206.71 221.6936 48
60 589.71 643.13 958.38 1011.45
72 695.52 781.41 1237.40 1325.16
6.0 6.5 7.0 7.5
261.57 253.72 438.36 541.26
404.65 415.40 786.33 814.31
8.0
140.57
267.58
475.44
653.01
723.73
pH [7-7,5] thch hp. Nghin cu ng dng Chn pH 732
NG THI QU TRNH LN MEN MT4, 200 v/ph 300C pH 7 Sau mi 12h thu 100ml dch nm mc
Xc nh sinh khi Hot tnh enzyme
o pH33
ng thi qu trnh ln men
KT LUNTuyn chn 3 chng c kh nng sinh tng hp b- galactosidase. cao nht l A. oryzae 3 Xc nh mi trng ph hp MT4 iu kin ti u [C] Lactose 30g/l [N] Peptone 1g/l + NH4NO3 0,5 g/l pH u 7 Thi gian ln men 72 h36
PHNG PHP LN MEN B MT
Solid-state fermentation(SSF)D thc hin Quy trnh Cng ngh khng phc tp Lng enzyme to thnh ln Ch phm enzyme th d sy kh v bo qun D x l nhim Din tch b mt ln, kh c gii ha37
Ging VSV
A. oryzae phn lp t t nhim cht thi ca nh my sa Gi ging [PDA] Nui cy bo qun 40C
Chun b mi trng
Cm m + Tru [1:1] 12% NaNO3 + 1% Lactose + Hu c # m- Thanh trng- pH 5
K thut nui cy
10ml dch 1x10-7 (bo t/ml) 300C 7 ngy
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Ln men b mtTrn 60g cm la m v v tru (t l 1:1) vo bnh thu tinh borosil 3000 ml Lm m vi nc ct v trng cha [ Lactose 12% w/w - NaNO3 1% w/w ] [ pH u 5.0 ] Tit trng mi trng cy chuyn 10ml huyn ph cha bo t nm si [ 30oC trong 6 ngy ]
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nh lng hot bng oNPG (Sigma Chemical USA) 1 n v hot = lng enzyme gii phng
1 mmol oNPG / 1 pht, iu kin th nghimXc nh hm lng protein tng vi Phng php Lowry40
SO SNH CC NGUN CARBON CARBON NH HNG NGUN
NH HNG NGUN NIT
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NH HNG CA M
pH
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Ti u ha iu kinNgun C Glucose cho hoat tnh enzyme mnh nht 386.6 mmol oNP/ml/pht NaNO3> peptone> (NH4)2SO4 > urea >NH4NO3>Corn steep liquor m 90%
Ngun N
m
pH v nhit
Chn pH 5 v nhit 300C
Tho lunHot tnh enzyme lactase t cc vi sinh vt khc So snh phng php ln men & hiu qu enzyme c nh v t do iu kin nui cy nh hng ln ti hot tnh enzyme ca vi sinh vt iu kin ti u nui cy VSV thu enzyme c th khng ging vi iu kin hot ng ti u ca enzyme kt lun44
SO SNH 2 PHNG PHP LN MENYU T Ging VSV LN MEN CHM Phn lp t t nhim cht thi ca nh my sa MT lactose c bn Lactose Peptone + NH4NO3 7 300C 200 v/ph 72 h (3 ngy) 168 h (7 ngy)45
LN MEN B MT PTN Ha sinh- H Bch Khoa H Ni
Nguyn liu- C cht Ngun C Ngun N pH u Nhit Tc lc Thi gian ln men
Cm m+Tru m 90% Glucose NaNO3 5 300C
Thu enzyme Ln men chm[C c CK]hoc
Ly tm Tch VSV Tp ko tan
[Trao i ion Phn hp th] Thu Enzyme
Tinh sch Enzyme tinh khit
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SN XUT ENZYME TINH KHITNghin mn Ph v thnh TB: enz tot ra
Trch ly
Dng nc dung mi ha tan
Lc
Ly phn dch
Kt ta Sy
Sy: d bo qun
Tinh ch kt ta
Cn enz khc & pro l
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SN XUT ENZYME
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Enzymes t nm siiu kin ti u: pH [ 3 5 ] - nhit [ 55 60C ] Khng tinh khit. Do , ng dng ca lactase t nm si gii hn cc sn phm c acid cao cng nh cc dc phm. Enzyme b- galactosidase thng mi A. oryzae: Enzeco Fungul Lactase
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Hng ng dng Lactase
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NI DUNG
NI DUNG1. Lactose v enzyme Lactase2. Gii thiu v Aspergillus Oryzae 3. Nui cy A.oryzae thu nhn Lactase 4. ng dng ca Lactase
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Enzyme thng mi ch yu chit xut t Nm men: Kluyveromyces lactis, K. fragilis, K. marxianus, Candida kefyr Nm si: Aspergillus niger , A. oryzae Lactase l mt trong s t cc enzyme c sn xut quy m ln vi c 2 dng c nh v t do.
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NG DNG LACTASE1981 Kligerman: Cho enzyme Lactase vo ly sa,
qua m trong t lnh: gim 70% lng lactose Sa ngho lactose
1991: Nhiu thc phm ct gim lactose c ymnh nghn cu v sn xut
Sa, ph mai, kem
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ng dng sn xut GOSGOS l mt loi prebiotic, ng dng trong thc phm Cht ngt b sung Thay th saccharose Bnh tiu ng hay bo ph.
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Tc dng ca GOS Tng sc khng vi vi khun gy bnh ng rut Kch thch min dch ng tiu ha Tng hp thu Canxi Qu trnh ln men sinh ra kh hi v nc phn mm v xp phng chng to bn
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Whey - casein
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Whey - caseinTi sao sa cn c m Whey v Casein??
Whey
Casein
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ng dng trong sa ngho lactose
Hm lng lactose c trong cc loi sa58
ng dng trong sa ngho lactoseThiu lactase tng i
Nguyn nhn
Tn thng rut non lp nim mc rut lactase khng sn sinh
Bm sinh59
ng dng trong sa ngho lactoseD ng sa b
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Xt nghim chn on
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Gii php
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ng dng trong sa ngho lactose
Sa u nnh c lng protein cao gn bng sa b, nhng t canxi hn sa b. Sa u nnh khng c lactose.
Sa go khng c gluten Lng asen trong sa go khuyn co khng nn cho tr di 4,5 tui ung sa 63 go.
Lactose free milk
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Kt lunb galactosidase m ra nhiu hng nghin cu mi. Nhng nghin cu ny c tim nng ng dng vo nhiu lnh vc khc nhau: cng ngh thc phm y hc Cng ngh c nh enzyme ng mt vai tr ln trong ch bin sa v whey. Vic s dng -galactosidase c nh trong thy phn lactose l mt ch khoa hc v cng ngh ng quan tm65
CM N S LNG NGHE CA C V CC BN
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