气相色谱-三重串联四极杆质谱法测定粮谷中169种农药的残留量

建立了粮谷中169种农药多残留的气相色谱-三重串联四极杆质谱(GC-MS/MS)的检测方法。样品经改进的QuEChERS净化处理,气相色谱分离,串联四级杆质谱多反应监测方式检测。结果表明,169种农药在粮谷中的检出限为0.3～13.0μg/kg,定量限为1.0～40.0μg/kg,线性范围在0.005 mg/L～2.0 mg/L之间,线性相关系数大于0.99,平均回收率在65.3%～143.6%之间,97%的农药相对标准偏差小于20%,该方法具有前处理简单、净化效果好、灵敏度高的特点,适用于粮谷中多组分农药残留的快速确认和定量检测。     

气相色谱-串联质谱结合QuEChERS方法检测蔬菜、水果中37种农药残留

本文旨在探究气相色谱-串联质谱结合QuEChERS方法检测蔬菜、水果中37种农药残留的效果。方法:对选取的蔬菜水果进行取样和提取,采用气相色谱-串联质谱结合QuEChERS方法进行农药残留检测。结果:130份样品中有4份为阳性,样品中农药残留率为3.08%。对检测结果为阳性的样品利用GB/T19648-2006的标准程序和方法,进行GC-MS/MS法进行重新检测,结果与本研究所用方法检测结果一致,且农药残留量基本相当。结论:气相色谱-串联质谱结合QuEChERS方法在检测蔬菜、水果的农药残留上具有较高的准确性,同时还具有快速、灵敏的优点。     

气相色谱-串联质谱法检测蔬菜中8种氨基甲酸酯类农药残留

目的建立气相色谱-串联质谱(gaschromatography-massspectrometry,GC-MS)同时测定蔬菜样品中8种氨基甲酸酯农药残留的检测方法。方法样品加入内标溶液后,经乙腈提取,氯化钠分层,上清液用石墨化炭黑固相分散萃取净化,残留农药经DB-5MS毛细管色谱柱分离,气相色谱-质谱联用仪检测分析。结果 8种氨基甲酸酯农药在0.01～1.0μg/mL范围内的加标线性关系良好,相关系数均大于0.99,方法检出限为0.01 mg/kg,加标回收率范围在72.58%～98.48%之间,相对标准偏差为4.38%～12.63%。结论该方法灵敏度好,选择性高,操作简单,定性定量准确可靠,适合多种蔬菜样品中氨基甲酸酯农药的多残留检测。     

QuEChERS-气相色谱-串联质谱法检测鱼腥草中121种农药残留

建立鱼腥草中121种农药残留的QuEChERS-气相色谱-串联质谱方法,并应用于68批样品筛查。对样品前处理和色谱方法进行优化。最终确定样品以乙腈进行提取,QuEChERS法进行净化处理,采用气相色谱-串联质谱在多反应监测模式下进行检测分析。121种农药在一定含量范围内线性关系良好,相关系数(r)均大于0.997 3;3个添加水平进行回收率实验表明,回收率在60%~140%范围内的农药数占总数的90.9%,86.8%的农药相对标准偏差小于15%。121种农药检出限(R_(SN)=3)范围为0.000 1~0.1 mg/kg,绝大多数小于0.01 mg/kg。68批样品种共检出27种农药。该方法简便、灵敏、准确,可用于鱼腥草中多农药残留的快速筛查与检测。检测结果为鱼腥草的种植生产和流通监管提供参考依据。     

固相微萃取-气相色谱-串联质谱法快速筛查葡萄酒中农药残留

目的建立固相微萃取-气相色谱-串联质谱法快速筛查检测葡萄酒中农药残留。方法葡萄酒样品稀释后进行固相微萃取,直接进行气相色谱-串联质谱检测。优化选择了萃取纤维类型、萃取方式、萃取时间等固相微萃取的实验条件,考察了方法性能(检出限、添加回收率和精密度等)。结果确定方法可检测目标农药为94种,其检出限10μg/L,平均回收率在60%~110%之间,且方法的重复性和再现性标准偏差分别在20%和30%之内。结论该检测方法操作简便、快速,单个样品分析时间不超过1 h,适用于葡萄酒中农药残留的快速筛查检测。     

烟草中有机磷农药残留的GC/MS快速分析

为快速检测烟草中多有机磷农药残留,建立了乙腈提取,PSA吸附剂净化,气相色谱/质谱联用法测定烟草中有机磷农药残留量的方法。结果表明,20种有机磷农药的回收率为70%～118%,相对标准偏差0.5%～11.9%。该方法适合批量烟草样品中多有机磷农药残留的快速检测。     

QuEChERS结合气相色谱-三重四级杆串联质谱法测定动植物混合型食品中多种农药残留

建立了气相色谱串联质谱(GC-MS/MS)定量和定性检测动植物混合型食品中7种农药残留量的方法。样品中的待测农药组分经乙腈-乙酸乙酯混合溶剂(85∶15,v/v)提取,采用改进的Qu ECh ERS法为净化方法,以外标法进行定量,以气相色谱-三重四级杆串联质谱(GC-MS/MS)多反应监测模式(MRM)检测。在动植物混合性食品基质中,以该方法检测的大部分农药的线性范围为0.01μg/L~0.50μg/L,检测低限最低可以达到1.0μg/kg,添加回收率为67.2%~118.6%,相对标准偏差(RSD)为5.2%~16.3%(n=6)。该方法的准确性高、重复性好、操作简便,适用于动植物混合型食品中多种农药残留同时测定。     

气相色谱-三重四极杆串联质谱法对甜瓜中11种农药残留的测定

目的建立用气相色谱-串联质谱联用法检测甜瓜中甲胺磷等11种农药残留的分析方法。方法样品用QuEChERS法提取,经MgSO_4、PSA净化,气相色谱-串联质谱法测定,外标法定量。结果 11种农药在添加浓度为0.05、0.10、0.20 mg/kg水平时具有良好的线性关系,相关系数均大于0.991,回收率为80.10%~111.30%,相对标准偏差(relative standard deviation,RSD)范围为1.32%~11.00%,检出限在0.0003~0.01 mg/kg。结论该方法简便、快捷,准确性、精确性和灵敏度均满足农药残留分析的要求。     

气相色谱-质谱联用法测定茶叶中21种农药残留

该实验建立了茶叶中21种农药残留的气相色谱-质谱(GC-MS)多反应监测模式(MRM)定性、定量分析检测方法,探讨不同提取方法、提取溶剂、浓缩方式等试验因素对茶叶农药多残留测定结果的影响。结果表明,以正己烷-丙酮(1∶1,V/V)混合溶剂超声提取、氮吹浓缩,用气相色谱-质谱法对茶叶样品中21种农药进行定性定量检测,21种农药在0.05～1.00μg/mL范围内呈良好的线性关系,相关系数(R~2)为0.9980～0.9999。在茶叶样品中分别添加质量浓度0.05mg/kg、0.20mg/kg、0.40mg/kg的农药组分,平均回收率为83.46%～92.13%,相对标准偏差(RSD)为4.88%～8.51%,检出限为0.0027～0.0219mg/kg,该方法具有前处理简便快捷、灵敏度高、成本低等优点,在实际茶叶农药残留检测中得到了广泛应用,能满足日常的茶叶农药残留检测。     

QuEChERS结合气相色谱-串联三重四极杆质谱快速测定水产品中100种农药残留

目的：建立Qu ECh ERS结合气相色谱-串联三重四极杆质谱快速测定水产品中100种农药残留的方法。方法：样品经改进Qu ECh ERS方法提取，分散固相萃取净化，通过气相色谱-串联三重四极杆质谱联用技术检测。结果：100种农药在0.005～0.500 mg/L范围内具有良好的线性关系，相关系数均大于0.995，对于5.00 g样品的100种农药的检出限范围为1.00×10^–6～2.97×10^–3 mg/kg，定量限范围为2.00×10^–6～9.90×10^–3 mg/kg,3个浓度添加水平的回收率在60.2%～120.0%，相对标准偏差(RSD,n=6)在0.26%～10.96%。结论：该方法具有操作简便、快速、可靠性强的特点，适用于鲩鱼、牛蛙、基围虾等水产品中多种农药残留的检测。     

Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications

Microgels are ‘soft’ microscopic cross-linked polymeric particles that are being increasingly exploited in a variety of industries for rheology control, encapsulation and targeted delivery. They are valued because of the ability to tune their functionality to address specific applications in oil recovery, coatings, drug delivery, cosmetics, personal care and foods. Food microgels are typically biopolymer hydrogels in the form of microspheres, nanospheres (also called nanogels), spheroids and fibres. The utilisation of engineered microgels in foods has so far been limited, despite their great potential to address several needs in the food industry, including: satiety control, encapsulation of phytonutrients and prebiotics, texture control for healthier food formulations (e.g. reduced fat products), and targeting delivery to specific areas in the digestive tract. We review the scientific and patent literature on the utilisation and manufacturing methods for producing microgels with an emphasis on micro-hydrogels for food applications.     

12—A CRITIQUE OF SOME HYPOTHESES RELATING TO THE HETEROGENEITY OF THE HIGH-SULPHUR PROTEINS OF WOOL

Joubert and Burns prepared a large number of fractions from the high-sulphur proteins of wool and estimated their molecular weights and amino-acid compositions. Their data have been re-examined in order to look for statistically significant interrelations between amino acids and between the proportion of various amino acids and molecular weight. Statistical analysis of the data is also used to examine the credibility of some hypotheses concerning the mechanism of keratin biosynthesis and to provide further evidence for the existence of families of proteins within the high-sulphur fractions of wool.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of     

The Latest Data about Development of Chinese Printing Industry in 2013

In the 2014 China（Shanghai）International Printing Week,Director Wang Yanbin released the latest data about development of Chinese printing industry in 2013.According to statistics,in 2013,the total output value of Chinese printing industry exceeded 1trillion Yuan for the first time,reaching 1.03985 trillion Yuan.There were 105,000 printing enterprises in China,employees were 3.415 million.The total asset was 1.06247 trillion Yuan;     

The State Council Issued "Directory of Government Approved Investment Projects(2013 Edition)"

正On December 2nd,2013,the State Council issued the notification of"Directory of Government Approved Investment Projects(2013 Edition)"(hereafter referred to as"notification").It is pointed out in the"notification"that in order to further deepen reforms in investment systems and administrative examination and approval systems,simplify administrative procedures and delegate powers to lower levels,earnestly     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,     

Top Ten News of China's Paper Industry 2013

On December 24th, 2013, the meeting on the selection of top 10 news of China＇s paper industry 2013 sponsored by 〈China Paper Newsletters〉 was held in Beijing. The yearly selection of the top l0 news, which began in 2000, has become a brand activity widely recognized in the industry thanks to the support from the authorities at all levels and public participation.     

National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the "13~(th) Five-Year Plan"

In Apri Commi major p Plan＂ （h 2014, the National Development and Reform ssion issued an announcement for selection of reliminary research projects for the ＂13th Five-Year ereafter referred to as ＂The Announcement＂）     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the latest scientific