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1、现代食品科技ModernFoodScienceandTechnology2015,Vol.31,No.9胶原明胶化过程中分子结构的变化111,23111,2王雪蒙,于玮,马良,郭雪霞,周梦柔,黄丹丹,张宇昊(1.西南大学食品科学学院,重庆400715)(2.西南大学国家食品科学与工程实验教学中心,重庆400715)(3.农业部规划设计研究院,北京100125)摘要:本试验以猪皮胶原为原料,研究胶原明胶化过程微观结构的变化规律。研究表明,8h的酸处理诱导下,胶原明胶化程度较高,热水提胶后明胶得率可达83.
2、98%,随着酸处理时间进一步延长,明胶得率显著下降;差示量热扫描(DSC)、红外光谱(FTIR)和圆二色谱(CD)研究表明,随酸处理的进行,胶原的三螺旋结构逐渐松散,维系三螺旋结构稳定的价键逐渐被破坏,酸处理8h后,胶原三螺旋结构被过度破坏,是导致明胶得率降低的主要原因。聚丙烯酰胺凝胶电泳(SDS-PAGE)分析显示,在酸处理的过程中,胶原肽链的降解始终存在,且明胶化胶原中所保留的亚基量直接影响明胶中亚基含量。因此,在明胶化过程中必须在肽链降解和三螺旋结构松散之间寻找平衡点,以获得高得率和高品质明胶。关
3、键词:胶原;明胶;明胶化;微观结构文章篇号:1673-9078(2015)9-98-105DOI:10.13982/j.mfst.1673-9078.2015.9.017ChangesinMolecularStructureofCollagenduringGelatinization111,23111,2WANGXue-meng,YUWei,MALiang,GUOXue-xia,ZHOUMeng-rou,HUANGDan-dan,ZHANGYu-hao(1.CollegeofFoodScience,So
4、uthwestUniversity,Chongqing400715,China)(2.NationalFoodScienceandEngineeringExperimentalTeachingCenter,SouthwestUniversity,Chongqing400715,China)(3.ChineseAcademyofAgriculturalEngineering,MinistryofAgriculture,Beijing100125,China)Abstract:Themicrostructu
5、reofcollagenfrompigskinwasstudiedduringgelatinization.Theresultsshowedthatarelativelyhighdegreeofgelatinizationofcollagenwasachievedafter8-hacidtreatmentandtheyieldofgelatinreached83.98%afterhotwaterextraction,whiletheyieldofgelatindroppedsignificantlywi
6、thincreasingdurationofacidtreatment.Theresultsfromdifferentialscanningcalorimetry(DSC),Fouriertransforminfraredspectroscopy(FT-IR),andcirculardichroism(CD)revealedthatthetriple-helicalstructureofcollagenbecameprogressivelylooseandvalencebondsstabilizingt
7、hetriple-helixweregraduallydestroyedduringtheprocessofacidtreatment.Thetriple-helicalstructurewasexcessivelydestroyedafter8-hacidtreatment,whichcouldbethemainreasonforthedecreaseingelatinyield.Moreover,theresultsofsodiumdodecylsulfate-polyacrylamidegelel
8、ectrophoresis(SDS-PAGE)indicatedthatcollagenpeptidechainsweredegradedduringacidtreatmentandthegelatinsubunitcontentwasdirectlyinfluencedbytheamountofsubunitsthatremainedaftergelatinization.Therefore,duringthegelatinization