HPLC法测定功能性饮料中维生素B6的研究

建立了功能性饮料中VB6的高效液相色谱测定法.方法采用C18(5μm,4.6mm×250mm i.d)反相色谱柱,流速1.0mL/min;柱温30℃;流动相v(甲醇)v(0.2g/L辛烷磺酸钠,体积分数为0.25%的三乙胺溶液,用乙酸调pH3.2)=3565;进样量50μL;激发波长310nm,发射波长395nm.方法的检出限为30μg/L,线性范围0.0150～5 μg/mL,加标回收率86.0%～98.0%,相对标准偏差为4.27%.该法具有样品预处理简单、灵敏度高、分析时间短等优点,可用于功能性饮料中VB6的直接测定.     

HPLC法测定山茱萸及其保健酒中马钱苷的含量

建立了测定山茱萸及其保健酒中马钱苷含量的高效液相色谱分析法.样品用80%甲醇回流提取并用0.45μm微孔滤膜过滤.色谱柱为Phenomsil C18 BDS柱(250mm×4.6mm,5μm),柱温为35℃,马钱苷检测波长为236nm,流动相为乙腈-水(1486),流速为1mL/min.该方法测得马钱苷的线性范围为0.092μg/mL～0.92μg/mL,回归方程为A=1264.1C 18.992(R=0.9997),平均回收率为99.82%,RSD=l.95%(n=5)山茱萸及其保健酒中马钱苷的含量分别为1.378%、0.703%.此法准确、快捷、重复性好,适合于马钱苷的含量测定.     

GPC-HPLC-FLD 法测定动植物油脂中的苯并(a)芘

建立动植物油脂中苯并(a)芘残留量的凝胶净化-高效液相色谱-荧光检测的测定方法。方法采用凝胶色谱净化系统处理样品,可除去油脂中甘油三酯等杂质的干扰。色谱条件：Hypersil ODS2(150mm×4.6mm,5μm)反相色谱柱,流动相为甲醇-水(94:6,V/V),流速1.0mL/min,激发波长365nm,发射波长406nm,柱温30℃。方法的检出限0.1μg/kg,线性范围0.1～50μg/kg,加标回收率92.0%～106.0%,相对标准偏差为1.86%(n＝6)。该法具有样品预处理简单、灵敏度高、精密度高等优点,可用于动植物油脂样品中苯并(a)芘的快速准确测定。     

功能食品中番茄红素的高效液相色谱检测方法

建立了一种广泛适用于功能食品的测定番茄红素含量的高效液相色谱检测方法。样品前处理采用水油两相萃取方法;色谱条件为色谱柱InertsilODS-SP柱(5μm,4.6×250mm),流动相为乙腈:甲醇=1:1,流速为1.2mL/min,检测波长为472nm。分析结果表明,番茄红素在0.30～50.0μg/mL线性良好,相关系数R2=0.9998,加标回收率98.6%,RSD为3.0%,说明该方法准确可靠。     

利用钛胶高效液相色谱法测定食品中叶酸含量

建立了利用钛胶高效液相色谱法测定食品中叶酸含量的方法。色谱条件:钛胶固定相(250mm×4.6mmi.d.,5μm),流动相为水:甲醇=70:30(v/v)、流动相中含磷酸盐(PBS)20mmol/L,流速0.9mL/min,柱温60℃,检测波长280nm。线性范围为5～25μg/mL,检出限1.9220μg/mL,回收率为92.7%～95.1%,RSD(n=8)<0.68%。应用于食品样品中叶酸的测定,结果满意。     

高效液相色谱法测定鸡蛋中三聚氰胺

建立采用固相萃取净化,高效液相色谱法测定鸡蛋中三聚氰胺含量的方法。样品采用三氯乙酸和乙酸铅溶液提取,优化样品提取时间、色谱柱及固相萃取柱,最终确定为样品提取20min、采用TC-C18(4.6mm×150mm,5μm)色谱柱和PCX固相萃取柱。采用紫外检测器,检测波长为240nm,流动相为乙腈:辛烷磺酸钠-柠檬酸缓冲液(10:90,V/V),流速1.0mL/min,进样量20μL,外标法定量。三聚氰胺在1～50μg/mL范围内,具有良好的线性关系(R2=1),在添加质量浓度为5～20mg/kg范围内,三聚氰胺添加回收率在72.8%～87.6%,RSD(n=6)为1.5%～4.0%,最低检测限为0.54mg/kg。     

凝胶渗透色谱-高效液相色谱法测定植物油中苯并芘

建立了用凝胶渗透色谱-高效液相色谱法测定植物油中苯并芘的方法。该方法以乙酸乙酯-环己烷(1:1,v/v)提取样品,凝胶渗透色谱净化,以ZORBAXSB-C18柱(4.6mm×250mm,5μm)分离,流动相为甲醇和水(90+10),流速1.0mL/min,激发波长365nm,发射波长412nm,柱温25℃,进样量25μL。该方法的检出限0.4μg/kg,线性范围0.1~10.0μg/L,加标回收率98.7%~109.2%,相对标准偏差为3.81%~8.76%。     

高效液相色谱-二极管阵列法测定高蛋白食品中的三聚氰胺

建立用高效液相色谱-二极管阵列法测定高蛋白食品中的三聚氰胺的检测方法.对不同样品采用不同的前处理方法,然后用Agilent TC-C18 4.6×250 mm色谱柱,柱温为40℃,流动相为0.02 mol/L硫酸铵∶甲醇=94∶6(V∶V),流速0.8 mL/min,二极管阵列检测器于235 nm波长下进行检测,并以保留时间和三维光谱图相似性系数进行定性,外标法定量.不同样品的加标回收率为98.8%～101.5%,RSD小于1.2%.方法线性范围为0.1～150μg/mL,检测限为0.01μg/mL,相关系数R=0.999 9.     

HPLC法测定动物组织中氯氰碘柳胺的残留量

将样品经乙腈提取,色谱柱为COSMOSIL 5C18-AR-Ⅱ(250 ×4.6 mm,5μm);柱温为35℃;紫外检测波长设在260 nm:流动相为甲醇:0.1%甲酸水溶液(95:5,V:V);流速1.0 mL/min;进样量50μL.结果氯氰碘柳胺样品平均回收率为74.35%～95.92%,相对标准偏差(ItSD)为3.19%～7.69%;最低检测限(LOD)为50μg/kg.该方法简便,准确,灵敏度高,是快速检测和监测动物组织中氯氰碘柳胺的残留可借鉴的分析方法.     

高效液相色谱法测定植物性样品中三聚氰胺的含量

建立了高效液相色谱法检测植物性样品中三聚氰胺的方法.样品由1%三氯乙酸-乙腈超声提取,加入蛋白沉淀剂进行纯化.色谱柱ZORBAX SB-Aq(250 mm × 4.6 mm,5 μm),流动相为磷酸-三乙胺溶液,流速为0.6 mL/min检测波长为240 nm,回收率为89.8%～91.1%,相对标准偏差在0.75%～1.60%之间.     

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.