高效液相色谱法快速测定小麦粉中过氧化苯甲酰

目的:用高效液相色谱准确、快速测定小麦粉中过氧化苯甲酰。方法:小麦粉直接以水溶解,经振荡及超声提取,滤膜过滤后上高效液相色谱进行测定。结果:苯甲酸在0.2μg/ml～100μg/ml范围内呈良好线性,检出限为0.3mg/kg。平均回收率在94.1%～99.0%范围内。相对标准偏差小于2%。经检验,本法对CNCA能力验证剩余样品的检测结果与CNCA公布结果基本一致。结论:本法简单快捷,结果准确,重现性好,适用于小麦粉中过氧化苯甲酰的测定。     

高效液相色谱法测定小麦粉中过氧化苯甲酰

面粉中过氧化苯甲酰经甲醇提取后,用KI将其还原成苯甲酸,通过测定苯甲酸的含量,间接测定过氧化苯甲酰的含量。检出限为0.4mg/kg,加标平均回收率为98.0%,RSD为3.4%。     

高效液相色谱法测定小麦粉中的过氧化苯甲酰

采用高效液相色谱法测定小麦粉中的过氧化苯甲酰,相关系数〉0．97,同一样品多次测定结果的标准偏差为0．076,RSD％为1．12,与气相色谱法的测定结果相比较,该法操作简便、快捷,重现性好,且两者的撩测结果不存在显著性差异。     

小麦粉中过氧化苯甲酰含量测定的不确定度评定

近几年来．过氧化苯甲酰作为小麦粉增白剂,被广泛使用在各种用途的小麦粉中,它具有明显的漂白杀菌作用,但过量食用对人体有一定毒性。利用气相色谱法测定小麦粉中过氧化苯甲酰已被列入国家标准,测量结果的质量直接影响着人们的健康。为评定检测工作和检测结果的准确性,实验室通常采用不确定度对检测结果进行说明。本文就气相色谱法测定小麦粉中过氧化苯甲酰含量的检测结果不确定度进行评定。     

小麦粉及其制品中过氧化苯甲酰测定的研究

根据GB/T22325-2008测小麦粉及其制品中过氧化苯甲酰的方法,其测得结果与快检试剂盒检测的结果往往不吻合,因此,有必要建立更科学的检测方法。本文介绍了对这项工作的研究,探讨了一种测定方法。     

小麦粉中过氧化苯甲酰含量的测定

本文介绍增白剂的作用机理、使用增白剂的优缺点及危害和应用气相色谱法来测定小麦粉中过氧化苯甲酰的含量的方法     

高效液相色谱法在小麦粉添加物检测中的应用

综述了高效液相色谱法在小麦粉中甲醛次硫酸氢钠、过氧化苯甲酰、溴化钾、偶氮甲酰胺等添加物检测中的应用。     

液相色谱法测定面粉中过氧化苯甲酰

过氧化苯甲酰是一种常见的面粉增白剂,本文介绍了高温过氧化苯甲酰自我还原成苯甲酸的液相色谱测定法,无需添加还原剂,利用过氧化苯甲酰高温分解的特性,自动分解成苯甲酸,作为测定苯甲酸的样品直接进行提取、测定.     

高效液相色谱法测定乌苯美司胶囊中乌苯美司含量

用高效液相色谱法测定乌苯美司胶囊中乌苯美司含量实验,采用色谱柱为ODS柱,流动相为乙腈-0.6%磷酸二氢钠(17:83),流速为1.0mL/min,检测波长为254nm,柱温为25℃.用外标法测定,线性范围为0.2～2.0mg/mL(r=0.9999),平均回收率为99.24%,RSD=0.52%.本方法简便、准确、重现性好,可用于该产品的质量控制.     

两种小麦粉中过氧化苯甲酰测定方法的对比分析

通过对现行两种小麦粉中过氧化苯甲酰的测定方法：GB/T 18415-2001和GB/T 22325-2008的测试比较,发现二者的差异与各自优势,为现实产品检测提供参考。     

紫外分光光度法测定面粉中的过氧化苯甲酰

本文基于在酸性条件下,过氧化苯甲酰(BPO)能把Fe2 氧化成Fe3 ,再与邻菲罗啉发生褪色反应,建立了紫外分光光度法测定面粉中过氧化苯甲酰的方法.测定过氧化苯甲酰线性范围为1.0 ×10-7g/mL-3.2×10-6g/mL和3.2 ×10-6g/mL～2.4×10-5g/mL,检出限6.0×10～g/mL,对8.0 ×10-7g/mL过氧化苯甲酰连续11次测定的相对标准偏差RSD为4.2%,已用于面粉中过氧化苯甲酰的测定.     

小麦种类及加工方式对全麦粉粉体特性的影响

为了研究全麦粉粉体特性,以卡尔指数原理为理论基础,使用粉体综合特性测试仪,对红麦、白麦、加麦3种不同种类的小麦面粉及不同加工方式下全麦粉粉体的特性,包括Carr流动性综合指数Fw和喷流性综合指数Fd,及其单项检测项目等进行逐一对比分析。结果表明,不同种类小麦的面粉及全麦粉的流动性呈显著性差异,面粉与全麦粉流动性呈极显著的差异性(p<0.01),但不同加工方式的全麦粉流动性没有显著性差异;面粉及全麦粉的流动性状均表现不太好,面粉有相当强的喷流性,但全麦粉仅表现出有倾向的喷流性状。     

Preparation and Comparative Clinical Evaluation of Liposomal Gel of Benzoyl Peroxide for Acne

A novel topical benzoyl peroxide (BP) gel formulation containing liposomal BP was shown to significantly reduce local irritation relative to its nonliposomal BP gel (plain BP gel) preparation and also to improve clinical efficacy (almost twofold) in the treatment of acne. BP liposomes were prepared, optimized, and formulated into a carbopol 934 gel base. Drug release evaluated using dialysis membrane has repeatedly shown that a new topical gel formulation containing liposomal BP (liposomal BP gel) significantly reduced BP penetration. Clinical evaluation data were also compared with those obtained with liposomal tretinoin (TRE) gel in an earlier investigation of ours. The overall improvement in terms of percentage reduction in total number of skin lesions demonstrated almost similar results for both BP and TRE. However, variation was observed in the treatment of separate types of lesions in which liposomal TRE gel was found to be more effective in treating comedones and liposomal BP gel in treating papules and pustules. Also, the liposomal gel formulation of both the drugs significantly reduced the local adverse effects, thereby improving patient compliance.     

Preparation and Comparative Clinical Evaluation of Liposomal Gel of Benzoyl Peroxide for Acne

A novel topical benzoyl peroxide (BP) gel formulation containing liposomal BP was shown to significantly reduce local irritation relative to its nonliposomal BP gel (plain BP gel) preparation and also to improve clinical efficacy (almost twofold) in the treatment of acne. BP liposomes were prepared, optimized, and formulated into a carbopol 934 gel base. Drug release evaluated using dialysis membrane has repeatedly shown that a new topical gel formulation containing liposomal BP (liposomal BP gel) significantly reduced BP penetration. Clinical evaluation data were also compared with those obtained with liposomal tretinoin (TRE) gel in an earlier investigation of ours. The overall improvement in terms of percentage reduction in total number of skin lesions demonstrated almost similar results for both BP and TRE. However, variation was observed in the treatment of separate types of lesions in which liposomal TRE gel was found to be more effective in treating comedones and liposomal BP gel in treating papules and pustules. Also, the liposomal gel formulation of both the drugs significantly reduced the local adverse effects, thereby improving patient compliance.     

高效液相色谱测定食品中的乙酰磺胺酸钾

试样中乙酰磺胺酸钾经高效液相反向C18柱分离后,测定其含量,试验结果证明,该方法快速简便、分析结果准确、工作效率高。