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1、现代食品科技ModernFoodScienceandTechnology2014,Vol.30,No.5一株荔枝生物保鲜乳酸菌的筛选及鉴定1122112马锞,徐匆,张长勇,黄应维,罗华建,罗诗,胡文锋(1.东莞市农业科学研究中心,广东东莞523086)(2.华南农业大学食品学院,广东广州510642)摘要:本文旨在从荔枝果实发酵液中筛选具抑菌活性的拮抗菌,并研究其对荔枝霜疫霉菌、炭疽菌、多酚氧化酶和过氧化物酶的抑制作用。采用平板培养法筛选出拮抗菌后,采用改良的琼脂扩散法和平板对峙法研究其对炭疽菌和荔枝霜疫霉菌的影响
2、;分别以邻苯二酚、愈创木酚为底物测定其对多酚氧化酶、过氧化物酶的抑制作用。结果显示,带菌体发酵液对荔枝霜疫病菌抑菌半径可达1.5cm,对荔枝炭疽病菌抑菌半径约为0.75cm;代谢产物粗品对荔枝果皮多酚氧化酶的抑制率接近60%,破碎菌体、代谢产物粗品对过氧化物酶的抑制率为分别为58.8%和51.4%。根据菌株的形态特征、培养特征、生理生化特征结合16SrDNA基因序列分析、系统发育树构建来鉴定菌株,最终确定从荔枝果实发酵液中筛选到的乳酸菌是植物乳杆菌,其在荔枝生物保鲜上具有良好的应用前景。关键词:乳酸菌;荔枝;保鲜;
3、筛选;鉴定文章篇号:1673-9078(2014)5-111-117ScreeningandIdentificationofaLacticacidbacteriaStrainWithLycheeFresh-keepingFunction1122112MAKe,XUCong,ZHANGChang-yong,HUANGYing-wei,LUOHua-jian,LUOShi,HUWen-feng(1.DongguanAgriculturalScienceResearchInstitution,Dongguan523079
4、,China)(2.CollegeofFood,SouthChinaAgriculturalUniversity,Guangzhou510642,China)Abstract:Anantagonisticbacteriafromlitchifermentationmedium,andtheinhibitoryeffectsofantagonismonPeronophythoralitchii,Colletotrichumgloeosporioides,polyphenoloxidase(PPO)andperoxid
5、ase(POD)werestudied.Astrainwasisolatedbyplatingmethod,andtheimprovedagardiffusionmethodandplateconfrontationmethodwereusedtodetecttheeffectofthisstrainonColletotrichumgloeosporioidesandPeronophythoralitchi,respectively.TheactivityofPPOandPODweredeterminedbyoxo
6、phenicacidandguaiacolassubstrate.ResultsshowedthattheinhibitionzoneradiusoffermentationbrothantagonizePenorophythoralitchiwas1.5cmandColletotrichumgloeosporioideswas0.75cm,andtheinhibitionrateofcrudemetabolitesonlitchipeelPPOwascloseto60%.Crudemetabolitesandce
7、llhomogenatesonPODwas58.8%and51.4%,respectively.Thisisolationwasidentifiedasastrainoflactobacillusplantarumaccordingtotheresultsofmorphologicalcharacteristics,physiologicalandbiochemicalcharacteristic,the16srDNAanalysisandphylogenetictreeconstruction,whichhada
8、goodapplicationprospectinlitchibiopreservation.Keywords:Lacticacidbacteria;litchi;fresh-keeping;screening;identification荔枝是起源于我国的世界级名果,果皮鲜艳美观,尽去矣”的特点,荔枝由于在盛夏高温季节采收,加肉质细腻多汁,香甜可口,营养丰