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1、微生物学通报May20,2013,40(5):822−828MicrobiologyChina©2013byInstituteofMicrobiology,CAStongbao@im.ac.cn研究报告冻干高活力纳豆芽胞杆菌菌粉保护剂的筛选和优化1*1112胥振国蔡玉华向敏胡翰林黄鹤春(1.合肥职业技术学院生物应用技术系安徽合肥238000)(2.安徽省富硒香生物食品集团有限公司安徽合肥238000)摘要:【目的】对冻干高活力纳豆芽胞杆菌菌粉保护剂进行筛选和优化研究,提高菌粉活菌存活率。【方法】采用单因素实验和正交实验设计,通过测定活菌存活率,筛选出
2、最佳保护剂的配方;并研究采用优化后冻干保护剂制备的菌粉在−20°C、4°C、25°C下的保存稳定性。【结果】纳豆芽胞杆菌的有效保护剂是:脱脂乳粉、甘露醇、L-抗坏血酸钠。最佳冷冻干燥保护剂配方是:脱脂乳粉10%+甘露醇4%+L-抗坏血酸钠1%,存活率达到91.63%。菌粉在−20°C、4°C、25°C下保存12个月后,存活率分别为:88.79%、70.16%和10.52%,说明菌粉在−20°C和4°C下保存稳定性较好,25°C下稳定性比较差。【结论】对纳豆芽胞杆菌冻干菌粉保护剂的优化,对纳豆芽胞杆菌的应用、活菌产品的质量稳定及新产品的研发均有一定的指
3、导意义。关键词:纳豆芽胞杆菌,冻干保护剂,冻干菌粉,保存稳定性ScreeningandoptimizationofthecryoprotectantsforhighactiveBacillusnattopowder1*11XUZhen-GuoCAIYu-HuaXIANGMin12HUHan-LinHUANGHe-Chun(1.DepartmentofBiotechnology,HefeiVocationalandTechnicalCollege,Anhui,Hefei238000,China)(2.AnhuiFuxixiangBiologicalFo
4、odGroupCo.Ltd.,Anhui,Hefei238000,China)基金项目:安徽省教育厅自然科学研究(产学研)项目(No.KJ2011B106);医学检验技术专业“中央财政支持提升服务能力”建设项目资助(No.教育部教职成厅函[2011]71号)*通讯作者:Tel:86-551-65631995;:xuzg0551@163.com收稿日期:2013-01-10;接受日期:2013-03-25胥振国等:冻干高活力纳豆芽胞杆菌菌粉保护剂的筛选和优化823Abstract:[Objective]Studyonthetechnologyofsel
5、ectionandoptimizationofBacillusnattofreeze-driedpowder,inordertoincreasethesurvivalratesoflivingbacteria.[Methods]Singlefactorandorthogonalexperimentaldesignsweretakentomeasurethesurvivalcellsandthenscreenedtheprotectionagentformulations.Andthestoragestabilitiesofoptimizedlyopr
6、otectantpowderpreparedatprotectionagentformulations.Andthestoragestabilitiesofoptimizedlyoprotectantpowderpreparedat−20°C,4°Cand25°Cweretested.[Results]TheeffectiveprotectingagentsofBacillusnattowere:skimmedmilkpowder,mannitol,L-sodiumascorbate.Thebestprotectantsformula:10%skim
7、milkpowder,4%Mannitoland1%L-sodiumascorbate,theresultsshowedthatthesurvivalratecouldreachto91.63%.Thesurvivalratesoffunguspowderconservedat−20°C,4°C,25°Cfor12monthswere88.79%,70.16%and10.52%,respectively.Thestoragestabilityofbacteriapowderat−20°Cand4°Cwereexcellent,whilethatat2
8、5°Cwaspoor.[Conclusion]Thefreeze-driedpowderprotective