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磷脂的提取与分析检测技术 总被引:2,自引:0,他引:2
磷脂的提取方法主要是萃取法;总含量的测定方法有称重法、比色法、紫外分光光度法等;磷脂不同组分的分离和测定方法有TLC、HPLC和31P-NMR等;利用RP-HPLC和GC可以对磷脂的脂肪酸的组成分析测定;使用HPLC、GC等和MS的联合使用可以对磷脂分子量及分子结构进行分析。本文分别对上述5个方面进行综述,并对不同方法的特点进行了初步探讨。 相似文献
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食用植物油掺假鉴别方法研究进展 总被引:7,自引:3,他引:4
阐述了食用植物油掺伪的现状,综述了理化方法、色谱法、核磁共振波谱法、红外光谱法、拉曼光谱法的检测原理,以及在食用植物油掺假鉴别中的研究进展.着重介绍了应用最广泛的色谱法,它主要通过对脂肪酸、甾醇、生育酚等物质的测定来进行掺伪鉴别.同时,对核磁共振波谱法、红外光谱法、拉曼光谱法在油脂掺伪检测中的初步应用进行了归纳.对掺伪检测技术的研究方向进行了展望. 相似文献
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乙醇氧化酶经固定化制成酶膜与过氧化氢电极构成酶电极,研究了乙醇酶电极分析方法的分析条件及参数,与常规比重瓶法测定乙醇含量进行比较,结果显示两者之间有较好的一致性.采用酶电极法测定玫瑰酒中乙醇含量具有成本低、方法简便、快速等优点. 相似文献
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磷脂作为保健食品之一,具有强精益肾,保肝补血,增强人体免疫功能,抗衰老等作用。通常可以由钼蓝比色法、薄层扫描法、高效液相色谱法对磷脂含量进行测定。本文首次采用红外光谱法对其进行测定,并 相似文献
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就蒽醌类化合物的定性、定量方法研究进展进行了综述。其中定性方法包括薄层色谱法,质谱法(MS)、氢谱法(HNMR)、碳谱法(CNMR)、核磁法(DEPT)的联用,红外光谱法、可见光谱法、紫外光谱法等。定量方法包括比色法、高效液相色谱法(HPLC)、薄层扫描法、毛细管电泳法(CE)等。 相似文献
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目的:研究GB 5009.266-2016《食品安全国家标准食品中甲醇的测定》在颜色深浅不一的蒸馏酒及其配制酒中,采用直接进样法与蒸馏前处理法的前处理方法的适用性。方法:以蒸馏酒及其配制酒为研究对象,按照该国家标准的要求,采用上述两种前处理方法进行检测数据比较。结果:样品颜色的深浅未能影响其中甲醇含量的测定结果,而且测定结果重现性及准确性都符合要求。结论:直接进样法操作简便、经济快速,适用于白酒、伏特加、朗姆酒、威士忌、白兰地这5种无论颜色深浅不一,但非复杂基质样品的蒸馏酒中,甲醇含量的快速测定。但是配制酒属于复杂基质样品,即使颜色很浅,如不进行蒸馏前处理的话,易对气相色谱仪器造成严重的污染,因此建议配制酒应采用蒸馏前处理法。 相似文献
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目的探究联合研发便携式近红外检测仪检测白酒基酒中甲醇含量的可行性。方法分别用比色皿、液体探头取样检测白酒基酒中甲醇的含量,借助化学计量学方法建立白酒中甲醇含量的预测模型,并与实验室VECTOR33型近红外光谱仪所建模型的预测能力进行比较。结果校正集决定系数分别为:0.819、0.838、0.886,校正标准差分别为:16.13、15.78、14.60mg/L,验证集的决定系数分别为:0.814、0.820、0.844,预测标准差分别为:19.99、19.25、20.44 mg/L,平均相对误差分别为:8.94%、8.32%、9.34%。结论研发的便携式近红外检测仪与实验室仪器的检测结果具有较好的一致性,可以用来检测白酒基酒中甲醇含量。 相似文献
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Determination of the botanical origin of hops (Humulus lupulus L.) using different analytical techniques in combination with statistical methods 下载免费PDF全文
Miha Ocvirk Jože Grdadolnik Iztok Jože Košir 《Journal of the Institute of Brewing》2016,122(3):452-461
Beer flavour and aroma depend mostly on the hop variety used in the brewing process. For this reason it is of crucial importance for brewers to be certain about the botanical origin of the hop variety. Metabolic fingerprinting is one of the approaches that can be used for determination of the botanical origin of many agricultural and food products. The aim of the current work was to differentiate between the five most important hop varieties in Slovenia. Gas chromatography, high‐performance liquid chromatography (HPLC) and Fourier transform infrared spectroscopy were carried out in combination with three different chemometric methods – principal component analysis, regularized discriminant analysis and hierarchical clustering – on 121 hop samples. The chemometric classification of the hop varieties was obtained with nearly 100% success. The best results were obtained with GC and HPLC data, within one year of harvesting. Copyright © 2016 The Institute of Brewing & Distilling 相似文献
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对生产新工艺白酒的基本原料必须严格要求及进行必要的处理,原酒必须符合国家标准GB2757的卫生指标和理化指标;食用酒精要求符合GB10343标准的一级以上;加浆用水必须进行软化和纯净处理;食品添加荆必须符合食品级GB2760国家卫生标准。生产的新工艺白酒的主要理化指标如酒精度、总酸、总酯、己酸乙酯含量、固形物及卫生指标和调加的其他添加剂必须符合国标要求。 相似文献
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SEBASTIANO PORRETTA LUCA SANDEI PAOLA MARIA CRUCITTI GIOVARRA POLI MARIA GLORIA ATTOLINI 《International Journal of Food Science & Technology》1992,27(2):145-152
Methods commonly used in quality control analysis of tomato paste were compared as a means of selecting improved means of specification for trade. Methods studied included reducing sugars using Fehling's reagent, HPLC, and enzymatic analysis; total acidity by volumetric titration (with indicator and combined electrode); volatile acidity with two different steam distillation apparatus and separation columns; and citric acid using HPLC and enzymatic methods. The use of nonspecific methods of analysis, such as Fehling's method and volumetric titration using phenolphtalein for total acidity determination, causes significant errors; moreover, the results strictly depend on the concentration of the samples. 相似文献
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Xiuyi Wang Qian Ai Yanfen Chen Zhiwei Wang Shiyi Ou 《International Journal of Food Properties》2013,16(7):1505-1512
The carpaine was isolated from Carica papaya L. leaf, was identified by means of Fourier transform infrared spectroscopy, mass spectrometry, nuclear magnetic resonance, and was determined by HPLC. The powder of dried leaves was macerated and extracted with ethanol/water/HCl (89:10:1 V/V/V) to produce crude alkaloid. The extract was fractionated on a silica gel column chromatography using methanol/chloroform (5:95 v/v) as the eluate. The major fraction was isolated according to Rf values of thin-layer chromatography (TLC) (silica gel, methanol/chloroform [15:85 v/v]) exposed by Dragendroff’s reagent. The extraction procedure, sample preparation, and HPLC conditions were evaluated and optimized. The method was fully validated in terms of accuracy, precision, specificity, and calibration model. Results showed that the developed HPLC method was suitable for the determination of carpaine using a single-point calibration. The calibration model was linear in the concentration range from 0.20 to 1.8 mg/mL. Analysis of different days showed that the method was precise with an average concentration of 0.93 g/kg and relative standard deviation of 0.062%. A recovery of between 97.6 and 100.1% was obtained in a 95% confidence interval indicating that the method was accurate and the content of the carpaine in the powdered Carica papaya leaves was 0.93 g/kg. 相似文献