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时间:2020-06-05
《小麦和玉米中微生物污染和生长的快速检测.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、现代食品科技ModernFoodScienceandTechnology2014,Vo1.30,No.8小麦和玉米中微生物污染和生长的快速检测翟焕趁’,张帅兵’,黄淑霞,蔡静平’(1.河南工业大学生物工程学院,河南郑州450001)(2.河南工业大学粮食储运中心,河南郑州450001)摘要:为了快速检测粮食,及加工品中真菌、细菌等微生物的污染及生长的状况,选用了过氧化氢酶活性检测与经典的平板菌落计数检测进行比对试验。结果表明,对灰绿曲霉菌(Aspergillusglaucus)、黄曲霉菌(Aspergillusflavus)和枯草芽孢杆菌(Bacillussubtilits
2、)等与粮食及加工品的储藏和流通品质及安全性密切相关的菌种进行梯度稀释菌悬液检测时,过氧化氢酶法检测值的相对偏差较小,且线目关性系数均达到或大于0.99,其检测值与平板菌落计数法检测值的相关性系数均大于0.95。对于不同微生物污染程度的粮食及加工品,两种方法的检测数值变化趋势完全一致。相对于同一带茵量的样品,当粮食或加工品中的微生物处于生长状态时,过氧化氢酶检测法显示出更高的检测灵敏度,酶活性检测值超过微生物非生长态下同一带菌量样品检测值2倍以上。因此,过氧化氢酶检测法可以作为检测粮食及加工品中微生物污染及生长状况的有效手段。关键词:真菌;细菌;酶活性;农产品;检测文章篇号:
3、1673.9078(2014)8.231.237RapidDetecti0n0fMicrobialContaminati0nandGrowthinWheatandCornZHAIHuan~hen,z姒NGShuai-bing,HUANGShu.xia,CAIJing-ping(1.CollegeofBioengineering,HenanUniversityofTechnology,Zhengzhou,Henan450001,China)(2.ResearchCenterofGrainStorage&transport,HenanUniversityofTechnology
4、,Zhengzhou,Henan450001,China)Abstract:Todetectcontaminationandgrowthoffungi,bacteria,andothermicroorganismsingrainanditsprocessedproductsmpi~y,acomparativeexperimentalstudywasconductedbyusingcatalaseactivitydetectionandplateculturecountmethods.Forthispurpose,gradientdilutionswereusedinAspe
5、rgillusglauc~,Aspergitsfl删S,Bacillussubtilis,andothermicrobialsuspensions,whicharecloselyrelatedtothequalityandsafetyofgrainanditsprocessedproductsduringstorageandcirculation.Theresultsshowedthatforthemethodinvolvingdetectionofcatalaseactivity,deviationswererelativelysmall,alllinearcorrela
6、tioncoeficientswereequaltoormorethan0.99,andthecorelationcoeficientsbetweentheme~uredvaluesusingthismethodandthoseobtainedusingtheplatecountmethodweregreaterthan0.95.Forgrainanditsprocessedproductswithdifferentdegreesofmicrobialcontamination,thechangeinthetrendofthemeasuredvaluesusingthetw
7、omethodswasconsistent.Forsampleswiththesametypeofmicroorganismsingrainanditsprocessedproducts,thecatalaseactivitydetectionmethodshowedrelativelyhighsensitivity.Additionally,whenthesemicroorganismswereinthegrowthstate,thevaluesforenzymeactivityweretwotimeshighe
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