LC-MS/MS法测定火锅食品中5种罂粟壳生物碱的不确定度评定

依据JJF 1059.1—2012《测量不确定度评定与表示》和CNAS—GL06—2019《化学分析中不确定度的评估指南》中不确定度评定的基本程序,通过建立数学模型,建立了高效液相色谱串联质谱法测定火锅食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因含量不确定度的分析方法。结果表明,罂粟碱、那可丁、蒂巴因、吗啡、可待因合成标准不确定度的最终结果分别为5.1×10-2,5.0×10-2,5.8×10-2,8.4×10-2,8.5×10-2;影响测量结果不确定度的主要因素是样品回收率,样品平行试验重复性,样品提取,校准曲线拟合,标准工作溶液的配置。从校准曲线拟合这一不确定度分量可以看出,采用内标法进行测定的吗啡和可待因明显优于外标法测量的其他3种物质,可通过内标法进行测定,以降低样品基质不同所引入的不确定度。     

LC-MS/MS法测定火锅食品中5种罂粟壳

依据JJF 1059.1—2012《测量不确定度评定与表示》和CNAS—GL06—2019《化学分析中不确定度的评估指南》中不确定度评定的基本程序,通过建立数学模型,建立了高效液相色谱串联质谱法测定火锅食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因含量不确定度的分析方法。结果表明,罂粟碱、那可丁、蒂巴因、吗啡、可待因合成标准不确定度的最终结果分别为5.1×10^-2,5.0×10^-2,5.8×10^-2,8.4×10^-2,8.5×10^-2;影响测量结果不确定度的主要因素是样品回收率,样品平行试验重复性,样品提取,校准曲线拟合,标准工作溶液的配置。从校准曲线拟合这一不确定度分量可以看出,采用内标法进行测定的吗啡和可待因明显优于外标法测量的其他3种物质,可通过内标法进行测定,以降低样品基质不同所引入的不确定度。     

超高效液相色谱-串联四级杆质谱法测定火锅底料中5种生物碱的方法改进

以上海市地方标准(DB 31/2010-2012)为基础,采用超高效液相色谱-串联四级杆质谱法检测了火锅底料中的罂粟碱、吗啡、那可丁、蒂巴因以及可待因5种生物碱成分的含量。样品经乙腈提取,采用C18和PSA吸附剂吸附净化后进行液相色谱-串联质谱分析,以电喷雾离子源(ESI)正离子多反应监测(MRM)模式检测。结果表明:罂粟碱、吗啡、那可丁、蒂巴因以及可待因的回收率控制在95%~105%以内,RSD为0.19%~1.33%。该方法灵敏度高、操作简便、准确,优化了样品预处理过程,可用于火锅底料中罂粟碱、那可丁、蒂巴因、吗啡和可待因含量的测定。     

市场监管总局发布《食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因的测定》《饮料中γ-丁内酯及其相关物质的测定》2项食品补充检验方法

正按照《食品补充检验方法工作规定》有关规定,国家市场监督管理总局通过2018年第3号公告,批准发布了《食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因的测定》《饮料中γ-丁内酯及其相关物质的测定》2项食品补充检验方法。《食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因的测定》规定了食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因的液相色谱-串联质谱测定方法,适用于香辛     

超高效液相色谱-串联质谱法测定调味料中吗啡、可待因、蒂巴因、那可丁和罂粟碱残留量

目的：建立超高效液相色谱-串联质谱法测定调味料中吗啡、可待因、蒂巴因、那可丁和罂粟碱残留量的分析方法。方法：样品用水分散、乙腈超声提取，经盐析、低温高速离心分层后，样液于40℃水浴氮吹近干，用10%乙腈溶液(含0.1%甲酸)溶解残渣，再经低温高速离心、过膜上机测定；以Kinetex^? 2.6μm Biphenyl 100?色谱柱(100 mm×3.0 mm)分离，0.1%甲酸-水和0.1%甲酸-甲醇为流动相进行梯度洗脱，电喷雾电离(ESI),正离子模式，多反应监测(MRM)下检测，吗啡、可待因用内标法定量，蒂巴因、那可丁、罂粟碱用外标法定量。结果：吗啡、可待因在0.5～20.0 ng/mL,蒂巴因在0.10～4.0 ng/mL,那可丁、罂粟碱在0.05～2.0 ng/mL范围内均有良好的线性关系，相关系数r均大于0.998。吗啡、可待因的方法检出限为1.0μg/kg,蒂巴因的方法检出限为0.2μg/kg,那可丁、罂粟碱的方法检出限为0.1μg/kg。5种生物碱的加标回收率在75.2%～117.3%之间，相对标准偏差均小于15%。结论：该方法操作简单，具有较高的灵敏...     

亲水作用液相色谱-串联质谱法快速测定食品中罂粟壳的生物碱残留

目的建立亲水作用液相色谱-串联质谱法快速测定食品中的罂粟壳残留生物碱的分析方法。方法样品中的罂粟壳成分采用优化后的Qu ECh ERS方法进行提取,BEH HILIC色谱柱分离(2.1 mm×100 mm,1.7μm),最后采用串联质谱仪对吗啡、可待因、罂粟碱、那可丁及蒂巴因进行检测。结果吗啡、可待因在2.0~100ng/mL范围内线性关系良好,罂粟碱、那可丁、蒂巴因在0.10~5.0 ng/mL范围内线性关系良好。平均加标回收率(n=6)在70%~120%之间,相对标准偏差小于12%。吗啡、可待因、粟碱、那可丁、蒂巴因的检出限分别为10、10、3.8、3.8、7.5μg/kg。结论该方法简便、快速、灵敏,可用于食品中残留罂粟壳成分的检测。     

QuEChERS/HPLC-MS法测定食品中的生物碱

采用QuEChERS/HPLC-MS法测定食品中罂粟碱、那可丁、蒂巴因、可待因、吗啡等五种生物碱,方法简便,准确度符合要求.吗啡、可待因用内标法定量,罂粟碱、那可丁和蒂巴因用外标法定量.经计算,加标回收率满足要求.     

Oasis MCX柱-高效液相色谱/三重四极杆质谱联用法测定火锅底料中罂粟壳不确定度评定

目的 评定Oasis MCX柱-高效液相色谱/三重四极杆质谱联用法测定火锅底料中罂粟壳不确定度。方法 用Oasis MCX柱法做前处理,高效液相色谱/三重四极杆质谱联用法进行分析,测定火锅底料中可待因,蒂巴因,吗啡,那可丁含量,并根据建立的数学模型对各分量进行不确定度评定。结果 当火锅底料中可待因含量为43.1 μg/kg时,扩展不确定度为2.2μg/kg（k=2）;蒂巴因含量为46.3μg/kg时,扩展不确定度为1.3μg/kg（k=2）;吗啡含量为42.0μg/kg时,扩展不确定度为1.4μg/kg（k=2）;那可丁含量为48.3μg/kg时,扩展不确定度为2.1μg/kg（k=2）。结论 曲线拟合是标准不确定度的最大来源,其次为重复性实验 。     

固相萃取-液质联用测定火锅底料中5种生物碱

建立双柱串联固相萃取-高效液相色谱-串联质谱法(HPLC-MS/MS)测定火锅底料中罂粟碱、吗啡、那可丁、可待因和蒂巴因5种生物碱成分的含量。样品用酸化乙腈提取,PSA和PXC固相萃取柱串联净化,经Hillic色谱柱分离,以电喷雾离子源(ESI)在正离子多反应监测(MRM)模式下进行测定,内标法定量。在优化的试验条件下,罂粟碱、吗啡、那可丁、可待因、蒂巴因的检出限分别为0.033、1.5、0.066、1.2、0.15μg/kg。5种生物碱类药物在3个加标水平下的回收率范围为96.0%~112.5%,RSD为2.0%~5.7%。该方法操作简便、准确、灵敏度高,适用于火锅底料中罂粟碱、吗啡、那可丁、可待因和蒂巴因含量的测定     

市场监管总局关于发布《食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因的测定》《饮料中γ-丁内酯及其相关物质的测定》2项食品补充检验方法的公告

正2018年第3号按照《食品补充检验方法工作规定》有关规定,《食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因的测定》《饮料中γ-丁内酯及其相关物质的测定》2项食品补充检验方法已经国家市场监督管理总局批准,现予发布。特此公告。附件:1.食品中吗啡、可待因、罂粟碱、那可丁和蒂巴因的测定(BJS 201802)     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

低温带皮菜籽粕微粉的不同粒级部分的功能特性

为研究低温带皮菜籽粕微粉的不同粒级部分的功能特性,以经低温脱脂的带皮菜籽粕为原料,经微粉碎后筛分成212~425μm、150~212μm和106~150μm的3个不同粒级的微粉样品,检测这些样品的吸水性、吸油性、乳化性和乳化稳定性、蛋白质体外消化率。结果表明:1 3个不同粒级的微粉样品之间的粗纤维含量存在显著差异,表明三者的结构组成成分有一定差异。23个微粉样品的乳化活性和乳化稳定性随粒度级别的减小而显著增加(P0.01)。33个微粉样品的蛋白质体外消化率随粒度级别的减小而显著增加(P0.01)。4不同粒级带皮菜籽粕微粉样品的吸水性与吸油性受其结构组成物质不同和粒度的双重影响,与粒度的相关性不明显。     

Microbiology of food taints

Fresh and processed foods are often spoilt by the presence of undesirable flavours and odours caused by microbial action. The aim of this paper is to review the current knowledge of microbiologically induced taints that occur in a wide range of foodstuffs, including meats, poultry, fish, crustaceans, milk, dairy products, fruits, vegetables, cereals and cereal products. Examples have been chosen where the compounds responsible for the taint have been identified and sufficient data obtained to demonstrate the involvement of microorganisms. However, in some cases the full identity of the causative organism may not have been elucidated. The types of microorganisms covered by this review include bacteria, fungi, yeasts, actinomycetes and cyanobacteria. Although cyanobacteria do not in general infect foods, their presence in aqueous systems and water supplies can lead to off-flavours in aquatic organisms and processed foodstuffs. Several examples of each of these processes are discussed. Wherever possible, the likely biosynthetic pathway used by the microorganism to produce the offending compound in a foodstuff is indicated.     

Analysis for organic residues from aids to polymerization used to make plastics intended for food contact

Polymers intended for food contact use have been analysed for organic residues which could be attributed to a range of substances employed as polymerization aids (e.g. initiators and catalysts). A wide range of polymers was extracted with solvents and the extracts analysed by gas chromatography-mass spectrometry (GC-MS). The overwhelming majority of substances identified were not derived from aids to polymerization but were oligomers, additives and adventitious contaminants. However, a small number of substances were identified as initiator residues. These included tetramethylsuccinonitrile (TMSN) which was observed in two polymers and it derived from recombination of two azobisisobutyronitrile (AIBN) initiator radicals. Methyl benzoate, benzoic acid, biphenyl and phenyl benzoate were detected in one poly(methyl methacrylate) sample and in two polyvinylchlorides and they are thought to be derived from benzoyl peroxide initiator. TMSN was subsequently targeted for analysis of poly-(methyl methacrylate) plastics using proton nuclear magnetic resonance spectrometry (¹     

Tests of potential functional barriers for laminated multilayer food packages. Part II: Medium molecular weight permeants

Experiments were performed to characterize the kinetics of the permeation of different medium molecular weight model permeants: bisphenol A, warfarin and anthracene, from liquid paraffin, through a surrogate potential functional barrier (25 microns-thick orientated polypropylene--OPP) into the food simulants olive oil and 3% (w/v) acetic acid. The characterization of permeation kinetics generally observed the permeation models previously reported to explain the experimental permeation results obtained for a low molecular weight group of model permeants. In general, the model permeants exhibited behaviour consistent with their relative molecular weights with respect to (a) the time taken to attain steady-state permeation into the food simulant in which they were more soluble, (b) their subsequent steady-state permeation rates, and (c) their partition between liquid paraffin and the OPP membrane.     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. I: Interlaboratory studies of methods of analysis

This paper describes the first part of a project undertaken to develop mussel reference materials for Paralytic Shellfish Poisoning (PSP) toxins. Two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin (STX) and decarbamoyl-saxitoxin (dc-STX) in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the second part of the project: the certification exercise. In the first study, 18 laboratories were asked to measure STX and dc-STX in rehydrated lyophilized mussel material and to identify as many other PSP toxins as possible with a method of their choice. In the second interlaboratory study, 15 laboratories were additionally asked to determine quantitatively STX and dc-STX in rehydrated lyophilized mussel and in a saxitoxin-enriched mussel material. The first study revealed that three out of four postcolumn derivatization methods and one pre-column derivatization method sufficed in principle to determine STX and dc-STX. Most participants (13 of 18) obtained acceptable calibration curves and recoveries. Saxitoxin was hardly detected in the rehydrated lyophilized mussels and results obtained for dc-STX yielded a CV of 58% at a mass fraction of 1.86 mg/kg. Most participants (14 out of 18) identified gonyautoxin-5 (GTX-5) in a hydrolysed extract provided. The first study led to provisional criteria for linearity, recovery and separation. The second study revealed that 6 out of 15 laboratories were able to meet these criteria. Results obtained for dc-STX yielded a CV of 19% at a mass fraction of 3.49mg/kg. Results obtained for STX in the saxitoxin-enriched material yielded a CV of 19% at a mass fraction of 0.34mg/kg. Saxitoxin could not be detected in the PSP-positive material. Hydrolysis was useful to confirm the identity of GTX5 and provided indicative information about C1 and C2 toxins in the PSP-positive material. The methods used in the second interlaboratory study showed sufficiently consistent analysis results to undertake a certification exercise to assign certified values for STX and dc-STX in lyophilized mussel.     

The Ministry of Environmental Protection Issued "Feasible Technology Guidelines for Pollution Prevention and Control in Wood Pulping Process of the Paper Industry (Trial)" and Two Other Guiding Technical Documents

On December 27t＂, 2013, the Ministry of Environmenta Protection announced that, in order to implement ＂The Environmental Protection Law of the People＇ s Republic of China＂, improve the working system in environmenta protection technologies, and promote technologica advancement in pollution prevention, the Ministry of Environmental Protection sponsored the formulation of three guiding technical documents including ＂Feasible Technology Guidelines for Pollution Prevention and Contro n Wood Pulping Process of the Paper Industry （Trial）＂     

1~(st) Intelli-Tissue~ EcoEc Tissue Machine Supplied by PMP Group Successfully Put into Operation in China

正On April 29th,2014,Intelli-Tissue EcoEc tissue machine supplied by PMP Group successfully put into operation at Hebei Xuesong Paper Co.,Ltd.,this is the first such kind of paper machine of PMP Group in China.