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ID:21492385
大小:44.50 KB
页数:16页
时间:2018-10-22
《麦芽炒制过程中近红外在线监测模型的建立及“炒香”终点判断研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、麦芽炒制过程中近红外在线监测模型的建立及“炒香”终点判断研究 [摘要]炒??芽一直沿用“炒黄炒香”的入药传统,而“炒黄炒香”终点的判断一直是炒制研究的重点与难点。该实验建立指标成分与NIRS之间的定量校正模型用于快速检测总还原糖、总氨基酸、总黄酮、A420及含水量,并提出基于“成分变化率”的炒制终点判断方法。以近红外光谱仪采集不同炒制时间样品光谱,建立基于近红外光谱的定量分析模型,并对光谱预处理、建模波段等参数进行优选;采用HCA,PLS-DA研究成分与“炒香”的关系,确定炒制终点。所建立的校正模型性能良好,采用所建模型进行在线分析,预测结果与实际测定值相关系数均大于0
2、.9,预测相对偏差小于10%;HCA方法将在不同炒制时间的麦芽分为4类,PLS-DA分析表明总还原糖对区分不同炒制时间的麦芽具有显著的贡献率,当总还原糖的变化率为80%时,即可判断“炒香”终点的到达。结果表明,近红外光谱可快速准确地测定麦芽不同炒制时间样品中总还原糖、总氨基酸、总黄酮、A420及含水量,并可判断“炒香”工艺终点,为中药炒制工艺的评价及终点判断提供新的研究方法。 [关键词]近红外光谱;麦芽;炒制过程;在线监测;终点判断 [Abstract]HordeiFructusGerminatushasbeenalwaysusedby"stir-frying"asa
3、traditionalmedicineandtheendpointjudgmentof"fragrant"and"yellow"hasbeenthefocusanddifficultyinfryingprocessresearch.Inthisstudy,aquantitativecalibrationmodelbetweenindexcomponentsandNIRSwasestablishedinordertorapidlydetectthecontentsofreducingsugar,totalaminoacids,totalflavonoids,A420andm
4、oisture;besides,anendpointjudgmentmethodoffryingprocesswasputforwardbasedonthe"componentchangerate".Near-infraredspectraofsampleswithdifferentfryingtimewerecollected,andaquantitativeanalysismodelbasedonnear-infraredspectroscopywasestablishedtooptimizetheparameterssuchasspectralpretreatmen
5、tandmodelingband.HCAandPLS-DAwereusedtostudytherelationshipbetweencomponentand"stir-frying",andtheendpointoffryingprocesswasdetermined.Theestablishedcalibrationmodelhadagoodperformancethatthecorrelationcoefficientsbetweenthepredictedresultsandtheactualmeasuredvalueswerebothmorethan0.9,wit
6、hpredictedrelativedeviationslessthan10%.HordeiFructusGerminatuswithdifferentfryingtimewasdividedinto4categoriesbyHCAanalysis.PLS-DAanalysisshowedthattotalreducingsugarhadasignificantcontributiontodistinguishingtheHordeiFructusGerminatusofdifferentfryingtime.Whenthechangerateoftotalreducin
7、gsugarwas80%,itcouldjudgethattheendpointoffryinghadbeenobtained.ResultsshowedthatNIRScouldnotonlyquicklyandaccuratelydeterminethecontentsofreducingsugar,totalaminoacid,totalflavonoid,A420andmoistureinHordeiFructusGerminatussamplesofdifferentfryingtime,butalsojudgeth
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