高效液相色谱法测定肉中五种磺胺类药物残留

采用反相高效液相色谱法，同时测定肉中五种磺胺类药物残留。用瞄柱、紫外检测器，流动相为甲醇＋乙腈＋2％乙酸；9＋18＋73，流速1．0ml／min，柱温25℃，于270nm波长处检测。最低检测限达到5μg／kg，相关系数在0．1-2μg／ml范围内为0．9999，回收率在85．5％-96．6％。     

液相色谱-串联质谱同时测定婴幼儿奶粉中5种四环素类抗生素残留

本文建立了婴幼儿配方奶粉中5种四环素类抗生素残留量的高效液相色谱-串联四极杆质谱联用测定方法。该方法用0．005mol／LNa2EDTA水溶液提取样品,以ZORBAX Aq-C18柱（2．1×150mm,5μm）分离,流动相为乙腈和0．1％甲酸水溶液（梯度洗脱）,电喷雾正离子MRM模式检测。该方法的检出限0．5ng／ml～1．0ng／ml,方法定量下限5．0μg／kg～10μg／kg,线性范围0．5ng／ml～20．0ng／ml,加标回收率84．2％～92．3％,相对标准偏差为2．20％～4．07％。     

HPLC法测定鳗鱼中三种喹诺酮药物残留

目的建立一种高效液相色谱方法测定鳗鱼中环丙沙星、恩诺沙星和恶喹酸3种喹诺酮类药物残留量,方法试样用含1％乙酸的乙腈提取,用正己烷脱脂、浓缩,缓冲盐＋乙腈（80＋20,体积分数）溶解,超高速离心净化,用荧光检测器测定,外标法峰面积定量。结果试样在10、0～60．0μg／kg范围内校正曲线呈良好的线性关系,3种物质的相关系数都在0．999以上。加标回收率：恶喹酸为87．4％～105．1％,环丙沙星为70．0％～85．7％,恩诺沙星为76.0％～92．8％,相对标准偏差均小于10％;检出限：恶喹酸为1.4μg／kg,环丙沙星为2．7μg／kg,恩诺沙星为1．5μg／kg。结论该方法操作简单、快捷．结果准确、可靠。     

液相色谱-电喷雾质谱同时测定肉类中的莱克多巴胺与克伦特罗

建立了液相色谱-质谱法（LC/MS）同时测定肉类中莱克多巴胺与克伦特罗残留的方法。用乙腈-盐酸溶液提取试样中的莱克多巴胺与克伦特罗，旋转蒸干，用甲醇溶解后进行液相色谱-质谱法测定。肉类中莱克多巴胺与克伦特罗的定量检出限均分别为0．2μg／kg与0．5μg／kg。加标回收率分别为82.0％～87.5％与83．6％～89．2％。批内相对标准偏差均小于7．1％。该方法灵敏、定量准确，可广泛应用于肉类中莱克多巴胺与     

LC-APCI-MS同时检测猪肉中7种磺胺类药物残留

为检测猪肉中磺胺类药物残留，建立了猪肉中7种磺胺类药物残留的LC—APCI—MS同时测定方法；样品经过匀浆、酸性甲醇超声波提取、柱净化后进行液相色谱-大气压化学电离-质谱分析；采用Zorbax XDB C18色谱柱，以均含0．2％乙酸的水和甲醇为流动相进行梯度洗脱，外标法定量；7种磺胺类药物的加标回收率为61，0％～114．7％（添加水平为1μg／kg，5pg／kg，10μg／kg），方法精密度1.5％～15.3％，方法检出限为3.92μg／kg～4.20μg／kg。     

高效液相色谱法同时检测调味品中的苏丹红和对位红

建立了调味品中苏丹红Ⅰ、Ⅱ、Ⅲ、Ⅳ和对位红的同时检测方法。样品用正己烷提取，提取液用氧化铝层析柱净化。采用Zorbax SB C18柱分离，以95％甲醇为流动相，流速1mL／min，检测波长505nm。上述5种色素组分在其质量浓度为0．16～2．56mg／L时有良好的线性关系，方法的检测限为17～69μg／kg；平均加标回收率为85％～125oA，相对标准偏差为2．6％～6．7％。该方法灵敏可靠，适合于调味品中苏丹红与对位红的同时检测。     

鸡肉中多种喹诺酮类兽药残留量的高效液相色谱测定研究

建立了一种测定鸡肉中氧氟沙星、诺氟沙星、环丙沙星、恩诺沙星兽药残留的高效液相色谱法。样品经乙腈提取，正己烷液一液分配去除蛋白和脂类物质，旋转蒸发除去乙腈，乙腈与水溶解残渣，过微孔滤膜，采用高效液相色谱荧光检测，外标法定量。氧氟沙星、诺氟沙星、环丙沙星、恩诺沙星在0．05～1．2μg／ml浓度范围内线性良好，相关系数为0．9997～0．9999。在0．05～1．0mg／kg浓度范围内，平均加标回收率在78．3％～101．8％之间，相对标准偏差为3．89％～12．43％。方法的最低检出限氧氟沙星为0．0037mg／kg、诺氟沙星为0．0037mg／kg、环丙沙星为0．0035mg／kg、恩诺沙星为0．0022mg／kg。该方法简便、快速，可满足鸡肉中多种唆诺酮类兽药残留量的检测。     

高效液相色谱测定猪肉中醋酸美仑孕酮的残留

建立了高效液相色谱测定猪肉样品中新型兽药醋酸美仑孕酮残留的方法。样品用V（甲醇）：V（0．1％H3PO4）=70：30混合溶液提取,经离心后用PCX固相萃取小柱净化,以Symmetry C8色谱柱为分离柱,线性范围为10～500μg／kg,检出限为5．0μg／kg,平均回收率为93．1～105．5％,相对标准偏差为1．5～4．6％,批间相对标准偏差为1．8～5．6％,检测效果良好。     

Seasonings by Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

建立了超高效液相色谱-串联质谱／质谱法高通量快速测定调料中吗啡、可待因、蒂巴因、罂粟碱、那可丁含量。样品通过乙腈一盐酸溶液提取,MCX固相萃取柱净化预处理后用超高效液相色谱-串联质谱／质谱仪进行检测。流动相为0．1％的乙酸-乙腈溶液＋10mmol／L乙酸铵溶液,梯度洗脱,流速为0．2mL／min,柱温40℃。该方法对调料中罂粟碱、那可丁最低检出限分别为O．8、1．0μg／kg,吗啡、可待因和蒂巴因的最低检出限为50μg／kg,8min就可以全部检出。     

高效液相色谱-串联四极杆质谱联席测定饼干中丙烯酰胺残留量

建立饼干中丙烯酰胺残留的高效液相色谱-串联四极杆质谱联用测定方法。该方法经纯水提取样品,以ZORBAXSB-Aq柱（4．6×150mm,5μm）分离,流动相为0．1％甲酸水溶液和乙腈（体积比为97：3）,电喷雾正离子MRM模式检测。该方法的检出限0．3μg／L,方法定量下限3．0μg/kg,线性范围0．3μg,/L-100．0μg/L,加标回收率91．5％～99．5％．相对标准偏差为4．44％。     

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.