消费品真实性检测技术研究进展

消费品与人们日常生活密不可分。随着社会经济的快速发展和人民生活水平的逐年提高,消费品的质量和品质越来越受到广大消费者的普遍关注。近年来,新材料和新工艺不断涌现,在造福广大消费者的同时,也对消费品真实性检测鉴别提出了更高要求。精准可靠的检测鉴别技术是消费品打假鉴伪的治本之策。该文综述了感官检验、显微鉴别、理化检验、仪器分析和多元统计分析等技术在消费品真实性检测和质量溯源中的研究进展,并展望了其应用前景,旨在为消费品真实性检测和质量控制提供有益的技术参考。     

化妆品分析样品前处理方法研究进展

作为与人们日常生活紧密相关的消费品之一,化妆品中禁、限用成分的分析检测,对于监控化妆品质量、保证消费者使用安全具有重要的研究意义。由于化妆品基质复杂,基体干扰严重,难以对目标物进行直接检测,因此需要采用样品前处理技术对其进行分离富集。该文综述了近年来的化妆品样品前处理方法,包括消解法、液-液萃取、固相萃取、固相微萃取、液相微萃取技术、微波辅助萃取以及超声波辅助提取等,并对其发展方向进行了展望。     

化妆品样品前处理与检测技术研究进展

随着我国经济和人民生活水平的不断提高,作为日常消费品的化妆品产业发展迅猛,其安全性日益受到广泛关注。随之而来的化妆品检测量的大幅增长对检测技术提出了更高的要求。传统样品前处理和检测技术因有机试剂消耗量大,检测通量低、检测周期长已无法满足当前绿色化学发展和高通量检测的需求。对此,科研人员开发了一系列环境友好型前处理技术以及高通量现场快速检测方法,为化妆品质量安全保驾护航。该文综述了当前化妆品样品前处理及检测技术的研究进展,并展望了其发展趋势和应用前景,以期为从事化妆品检测的科研和检验人员提供技术参考。     

食源性致病菌快速检测方法研究进展

食源性致病菌污染是导致食品安全问题的重要因素,食源性致病菌的检测已成为近年来研究的热点。以免疫分析、分子生物学、生物传感器、代谢组学、核酸适配体等技术为基础的快速检测方法发展迅速,已成为检测食源性致病菌的主要方法。该文结合近年来各种快速检测方法的相关研究进展,介绍了以上述技术为基础的快速检测食源性致病菌的方法,并讨论了现有方法存在的问题和未来的发展方向,以期为食源性致病菌的防控和保障消费者身心健康提供借鉴。     

洗涤用品质量安全检测技术研究进展

洗涤用品是日常使用的产品,其质量安全受到广大消费者的关注。洗涤用品中可能存在的化学风险物质,将对消费者的健康安全产生负面影响。为了减少和避免洗涤用品质量安全问题,研究人员采用多种分析测试技术,开发、建立了洗涤用品中化学风险物质的检测方法。该文综述了近年来洗涤用品质量安全检测技术的研究进展,以期为相关领域的科技人员提供理论支持和技术参考。     

消费品中限用化学物质的法规要求及相关检测技术

近期国内外市场相继发生多起消费品因含有重金属、邻苯二甲酸酯增塑剂、致癌芳香胺等有害化学物质而大规模召回的质量安全事件,引致各国陆续发布涉及消费品化学物质的技术性法规和标准,对其中含有的化学物质提出越来越高的要求.该文研究了欧盟、美国和中国等国家涉及玩具、纺织品服装、电子电气产品、家具和食品接触材料等重要消费品的质量安全技术法规的状况及相关的禁(限)用化学物质的要求,并针对检测这些化学物质所涉及的多种最新样品前处理技术和先进仪器分析检测技术进行了综述,以满足其在生产和外贸通关的检验需求.     

蔬菜中多种有机磷农药残留量检测方法的比较

农药残留是影响蔬菜质量安全的一个重要因素,已成为各国衡量蔬菜卫生及质量状况的首要指标.发展快速、可靠和实用的农药残留检测方法是保障消费者健康的有效手段.     

化妆品中植物原料组分检测技术研究进展

化妆品已成为当今社会人们生活中不可或缺的日用消费品。近年来,随着人们追求天然、绿色、安全、健康的意识日益增强,以植物活性成分为主的天然化妆品越来越受到广大消费者的青睐。与传统化妆品相比,植物中的天然物质更容易被皮肤吸收,且不易在体内产生沉积。该文介绍了化妆品中已使用的植物原料组分,并对其相关检测技术进行了综述,以期对植物资源的有效开发利用和化妆品的检验检测提供理论指导和技术支持。     

化妆品质量安全检测技术研究进展

近年来,化妆品质量安全问题日益成为公众关注的焦点,许多知名品牌化妆品相继检出含有禁用或限用物质,这不仅损害了消费者权益,而且也给化妆品企业带来了重大经济损失。为减少或避免不断涌现的化妆品质量安全事件,研究人员采用多种分析测试技术,建立了化妆品中化学风险物质的一系列检测方法。该文综述了近年来国内外重要学术期刊在化妆品质量安全检测技术领域的研究进展,并介绍了代表性的化妆品检测新技术,以期为从事化妆品检测的科研和检验人员提供相关理论支持和技术参考。     

CNAS认可实验室质量安全风险管理

随着人们生活质量的提高和科学技术的进步,消费品的质量安全已经成为各个国家关注的焦点,很多国家都制定了相应的技术法规来确保本国消费品的质量安全。美国、欧盟等发达国家对消费品中有毒、有害物质的限量正在逐步降低,这就对公共检测机构的技术水平提出了更高的要求,检得出、检得快、检得准,并出具权威、公正、可信、准确的试验报告,必然要求公共检测机构进行严格、规范、科学的质量安全风险管理,以确保公共检测机构对实验室     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.