α-,,(,750021):、α-,3、,α-10(4、3、3),,1.9~2.6,,α-4.8~5.7g/mL。,,,α-9.6~13.0g/mL,69.9%~129.5%。:;;;;:TQ925.1:A:1672-5190(2010)09-0001-03SeparationandMutagenesisofAlpha-amylaseProducingBacillusLIUYa-qin,CHENHai-kui,KONGLing-quan(SchoolofBiologicalScienceandEngineering,NorthernUniversityforNationalities,Yinchuan750021,China)Abstract:Tenalpha-amylaseproducingBacillusstrainswereisolatedfromsoil(fourstrains),water(threestrains)andflour(threestrains)throughisolationwithstarchplates,Gram′sstainingandsporestaining.Theratioofhydrolysiszonediametertocolonydiameterwas1.9-2.6.Liquidculturemediumwasusedforfermentationtoproduceamylase.Theactivityofalpha-amylasewasdeterminedbycolorimetry,anditwas4.8-5.7g/mLinfermentationbroth.Theoriginalstrainsproducinghigh-activityalpha-amylasewasselectedandmutatedbyUVmutagenesis.Excellentstrainswereobtained,andtheiractivityofalpha-amylasewasupto9.6-13.0g/mLundersuitableconditions,whichwas69.9%-129.5%higherthanthatbeforeselection.Keywords:amylaseproduction;Bacillus;separation;selection;mutagenesisα-1,4-α-D-,,、,。α-、、、、[1]。,,α-,α-。α-,,[2]。,(pH2.0)α-,。,α-、、[3-5]。,,。,。α-、[6]。,,。,α-。α-,a-[7-9]。,、、,(、、)α-,α-,。11.1[10-11]:5.0g、2.0g、10.0g、5.0g、20.2g,1000mL,pH7.2~7.4,0.1MPa30min。:40g、80g、(NH4)2SO44g、Na2HPO48g、CaCl22g,1000mL,250mL50mL,0.1MPa30min。、、,。1.21.2.1:,(HC)。1.2.2α-[12]:。:1mL60℃,pH6.0,1h1。1.2.3[13]:,,,,600nmOD600,OD600。1.31.3.1α-:31g,,80℃20min,。,37℃24~48h;、、、。、,。,,,,。,37℃:2010-08-28:(2008sy011)。:(1965—),,,。AnimalHusbandryandFeedScience2010,31(9):1-324h,4℃。1.3.2α-1.3.2.1———:,,,37℃24h。cfu()5~6,,(HC),。1.3.2.2———α-:HC,(108/mL),10%,180r/min、37℃60h,α-,。1.3.3α-1.3.3.1:,,106/mL,5mL7cm,,,15W30cm30,60,90,120,150,180s,,,,37℃24h,,,。1.3.3.2:,HCα-。1.3.3.3:cfu()5~6,,(HC)。HC,HC,(108/mL),10%,180r/min、37℃60h,α-。α-,α-,。22.1α-3,,,。,(1)。3:①:,,,,,,,,。②:。:,,。①312③:、,。2.2α-、3,64,,47,10,,4(Ty1~Ty4)、3(My1~My3)3(Sy1~Sy3)。10(HC)1。6,α-,2。2.3,α-,(2)。2,,。,,,,,,,,,。2,180s93%,,,,,,,。,,120s(84%)。2.4Sy1,10,3。6,α-,4。Sy1i,12.97g/mL,129.5%,,α-。3、3α-,,。9.6~13.0g/mL,,69.9%~129.5%。:[1][2][3][4][5][6][7][8][9][10][11][12][13]306090120150180100806040200(%)(s)2,,,.α-[J].,2005(8):14-17.VANDERMAARELMJ,VANDERVEENB,UITDEHAAGJC,etal.Propertiesandapplicationsofstarch-converingenzymesofthealpha-amylasefamily[J].JBiotechnol,2002,94(2):137-155.,.α-[J].,2008,14(2):235-239.,,,.α-[J].,2010,38(20):10509-10511.,,,.1α-[J].,2010,38(4):1709-1711.,.[J].,2007,3(3):51-52..α-[D].:,2007.,,,.[J].,2002,26(2):3-5.,,.[J].,2009,37(12):5362-5363,5371.,,,.(Brevibacillusbrevis)XDH[J].:,2006,37(2):190-195..α-[J].,2009,37(12):5372-5374..[D].:,2006..α-[J].,2003,22(4):76-79.□310Sy1a1.40.43.50Sy1b1.70.62.83Sy1c1.50.53.00Sy1d1.30.43.25Sy1e1.80.72.57Sy1f1.70.62.83Sy1g1.40.52.80Sy1h1.60.53.20Sy1i1.70.62.83Sy1j1.80.72.57cm8′33″075.65Sy1a4′48″2110.00Sy1c4′59″869.60Sy1d4′11″9611.43Sy1f3′53″8812.31Sy1h4′01″2312.00Sy1i3′43″1612.9746g/mLTy11.80.72.57Ty21.90.92.11Ty31.90.82.38Ty42.21.02.20My12.20.92.44My22.30.92.56My32.11.02.10Sy12.31.12.09Sy22.51.22.08Sy32.51.31.92110cm26Ty18′53″675.39Ty39′37″215.0My18′58″985.33My28′41″835.52Sy18′33″075.65Sy29′58″664.80g/mL:α-93