奶白花芸豆淀粉颗粒结构及理化特性研究-论文.pdf

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1、※基础研究食晶科学2012，Vo1．33,No．0363奶白花芸豆淀粉颗粒结构及理化特性研究韩春然，姚珊珊，许鑫(哈尔滨商业大学食品工程学院，黑龙江省高校食品科学与工程重点实验室，黑龙江哈尔滨150076)摘要：研究奶白花芸豆淀粉的颗粒结构及基本理化性质。结果表明：奶白花芸豆中直链淀粉含量较高，为37．1％；芸豆淀粉．碘的最大吸收光谱在波长617nm附近；芸豆淀粉颗粒较大的呈现卵形，颗粒大小分布较均匀。x射线衍射分析表明，该芸豆淀粉属于A型结晶结构；芸豆淀粉的粒度均呈光滑单峰型，分布曲线为正态分布，高峰出现在21．12~23．51／am处。芸豆淀粉颗

2、粒偏光十字极其明显。芸豆淀粉糊凝沉性质表明该淀粉容易老化；芸豆淀粉糊的透光率在0～12h内没有显著变化，12~24h内透明度呈显著下降趋势，24~48h内没有显著变化。在质量浓度为2g／100mL时，析水率最高，冻融稳定性最差；差示扫描量热仪(DSC)分析结果表明，起始糊化温度为61．3℃，2个糊化峰值温度分别为73℃和74．6℃，糊化结束温度为83．4℃，糊化所需焓值为50．55Jig。淀粉糊质量浓度对其黏度具有显著影响，4g／100mL为该芸豆淀粉成糊临界质量浓度。关键词：奶白花芸豆；颗粒形貌；理化特性GranuleStructureandPhy

3、sico—chemicalPropertiesofLightSpeckledKidneyBeanStarchHANChun—ran，YAOShan．shan，XUXin(Heilon~iangProvincialKeyLaboratoryofFoodScienceandEngineering，CollegeofFoodEngineering，HarbinUniversityofCommerce，Harbin150076，China)Abstract：Thegranulestructureandbasicphysico—chemicalproperti

4、esofstarchfromlightspeckledkidneybeangrowninHeilongjiangprovincewerestudied．Theamylosecontentoflightspeckledkidneybeanstarchwas37．1％．Thestarchshowedmaximumabsorbanceat617nlTlaftercomplexingwithiodine．Thestarchgranuleswerelargeandovalinshapeandshowedanuniformsizedistribution．The

5、crystalstructureofthestarch，asindicatedbyX—rayanalysis，belongedtotypeA．Thegranularitydistributionshowedasinglesmoothpeakat21．12—23．51umandWasinanormalmanner．ThebirefringencecrossofstarchgranulesWasveryobviousandthestarchrevealedanobviousretrogradationproperty．Inaddition，the~ans

6、parencyofthestarchgelhadnosignificantchangeduring0-12hand24—48h．whileasignificantchangeWasobserveddunng12—24h．Thefreeze—thawstabilityWastlleweakestattheconcentrationof2％．DSCresultsshowedthattheoriginalpastingtemperaturewas61．3℃andthatthepastingpeaktemperatureswere73℃and74．6℃．re

7、spectively．Thecompletepastingtemperaturewas83．4℃andtheenthalpyrequkedforcompletepastingwas50．55J／g．Theconcenfationofthestarchhadasignificanteffectonviscosity．ThecriticalconcenfationforthepastingofthestarchWas4％．Keywords：lightspeckledkidneybeen；granulemorphology：physico—chemical

8、properties中图分类号：TS235．3文献标识码：A文章编号：1002．6630(2012)03．0