固相微萃取在气相色谱-质谱联用检测纺织品中有机磷农药的应用

针对纺织品中微量甚至痕量有机磷农药残留难于采集和制备，进而给分析检测带来较大误差的问题，将固相微萃取（SPME）技术应用在气相色谱-质谱（GC—MS）联用法中，以棉纺织品为例，对其中常见的马拉硫磷、甲基对硫磷和喹硫磷3种有机磷农药进行吸附富集、萃取和检测。测试结果表明，采用100μm的聚二甲基硅氧烷（PDMS）纤维对样品萃取30min，在GC仪器的进样口热解脱附180S后，即可进行GC—MS定量检测，线性范围0．1～500μg／L，检出限低于0．05μg／L，实际样品平均回收率介于94．5％～96．2％之间，相对偏差（R.S．D）介于9％～13％之间，说明SPME法是一种简便可行的有机磷农药的样品预处理方法。     

北京市蔬菜、水果中有机磷农药残留现状调查

为了解北京市蔬菜、水果中有机磷农药残留情况，2002年在北京市抽检样品354件进行13种有机磷监测，其中蔬菜28l件，水果73件。检测结果显示7．6％的检品不符合国家标准。叶菜类(14，占9．3％)和根茎类(8，占17．4％)蔬菜的不合格率明显高于瓜菜、果菜类(2，占2．4％)蔬菜和水果(3，占4．1％)。13种有机磷检测出12种，其中禁用农药占53％。本市种植的蔬菜、水果与外埠进京产品的有机磷农药残留情况无显差别，超市、集贸市场、批发市场销售的产品的不合格率亦无显差别。     

茶叶中优乐得和菊酯类农药的监测与污染评价

采用气相色谱分离，ECD测定茶叶中优乐得、甲氰菊酯、氰戊菊酯的残留量。结果：对3种农药检测的回收率范围为72．0％-100.3％，相对标准偏差为2．5％-5．6％，最小检出限为O．01μg／mL-0．05μg／mL。采用本文的测定方法检测了采自福鼎、永川、蜀永、缙云山和川茶五个茶园的茶叶样品中的优乐得和菊酯类农药含量，结果表明不同茶园的茶叶中优乐得和菊酯类农药的检出量差异很大。同时，对这几种茶叶的农药残留进行了污染评价。     

双柱固相萃取-高效液相色谱法测定大米中氨基甲酸酯农药残留量的研究

本文研究了用高效液相色谱-紫外检测器方法同时检测大米中八种氨基甲酸酯类农药(杀线威、灭多威、涕灭威、抗芽威、残杀威、苯恶威、西维因、仲丁威)的残留量。本文对多种氨基甲酸酯农药的提取、净化方法、色谱分离条件、线性关系、回收率和重现性进行了研究，并对方法进行了验证，研究结果表明用丙酮作为提取剂，用florisil和C18固相萃取净化柱双柱净化样品，简化了净化操作，且提高了检测灵敏度。采用Spherisorb C8色谱柱，流动相用乙腈：水(33．5：66．5)，八种氨基甲酸酯类农药得到完全分离。八种氨基甲酸酯类农药的平均回收率分别为杀线威80．9％-89．5％，灭多威82．9％-91．6％，涕灭威82．6-91．2％，抗芽威81．2％-86．7％，残杀威82．3％-93．9％，苯恶威84．7％-94．4％，西维因82．4％-90．0％，仲丁威83．1％-91．0％。变异系数(Cv％)均在3．97以下，检测低限分别为：杀线威0．005，灭多威0．01，涕灭威0．005，抗芽威0．005，残杀威0．0025，苯恶威0．0025，西维因0．005，仲丁威O．01。方法的检测低限、回收率和精密度均满足残留分析要求。     

UPLC-MS／MS法测定大米中9种硫代氨基甲酸酯类农药残留

本文建立了超高效液相色谱-串联质谱（UPLC-MS/MS）检测大米中9种硫玳禽基甲酸酯类农药残留的方法。9种硫代氨基甲酸酯类农药在1．0-100岭／L范围内线性良好,相关系数为0．9966-0．9993,定量限小于0．5μg／L;9种目标物的回收率为76．0％-120．0％,相对标准偏差为2．2％19．6％。该方法准确、灵敏、快速,可满足大米中9种氨基甲酸酯类农药残留量的检测需要,该研究对食品安全及风险预警具有一定参考意义。     

气-质谱联用法测定罗汉果中有机磷农药残留

建立气相色谱-质谱联用法(gas chromatography-mass spectrometry,GC-MS)测定罗汉果中11种常用有机磷农药残留量的方法。样品经石油醚-丙酮(体积比2∶1)超声提取,提取物通过活性炭净化后选用HP-5MS毛细管柱对11种有机磷农药进行分离,GC-MS检测,外标法计算含量。11种有机磷农药在线性范围内(10μg/L~750μg/L),相关系数均大于0.999 0,检出限为LOD为0.432μg/L~3.901μg/L。样品3个加标水平(0.125、0.25、0.375μg/g)下,罗汉果中11种有机磷农药回收率均在83.3%~112.4%,相对标准偏差(RSD,n=6)为1.45%~8.28%。     

固相萃取-毛细管气相色谱法测定小白杏中拟除虫菊酯类农药多残留

应用固相萃取技术和毛细管气相色谱法，并采取程序升温模式和不分流进样方式在μ-ECD检测器上同时测定小白杏样品中四种拟除虫菊酯类农药多残留组分。测定结果表明：四种拟除虫菊酯类农药分离效果较好，其线性范围较宽，并在此浓度范围内与峰面积呈良好的线性关系；同时方法的最小检测限低于0．6μg／L（0．214～0．594μg／L），相对标准偏差均小于10％（2.48％-8．05％），其加标回收率在76．46％-102.96％之间。因此，本研究建立的方法简便、快速、经济，具有良好的灵敏度、精密度和准确度，可以满足小白杏样品中拟除虫菊酯类农药多残留检测要求，同时对其他果品中拟除虫菊酯类农药多残留分析具有一定的参考价值。     

气相色谱法检测黄瓜中的48种有机磷农药残留的方法研究

建立了固相萃取气相色谱法测定黄瓜中的48种有机磷农药残留的方法。方法：用体积比1：1的环己烷和乙酸乙酯提取样品中的有机磷农药，固相萃取（SPE）柱净化，气相色谱FPD检测。结果表明：54种有机磷农药在46min内分离良好，在0．01mg／L-1．0mg／L范围内线性良好，相关系数为0．9939～0．9999；在0．01mg／kg～0．05mg／kg浓度范围内，外标加标法平均回收率在65％～136％之间；相对标准偏差为0．12％～16％；方法检出限为0．0065mg／L～0．15mg／L。结论：该方法提取完全、净化彻底、定量准确、操作简便、灵敏度高、符合实际应用需要。     

微波辅助萃取-气相色谱法测定茶叶中多种有机氯和拟除虫菊酯农药残留

建立了茶叶中18种有机氯和9种拟除虫菊酯农药残留微波辅助萃取．气相色谱分析方法。运用正交设计法对微波萃取条件进行了优化，茶叶样品用正己烷-二氯甲烷混合溶N（1：2，V／V）进行萃取，萃取液用弗罗里硅土和中性氧化铝混合层析柱净化，采用J＆WDB-1701毛细管柱分离，GC．ECD法同时测定。在0．4、0．2、0．1ml（0．5μg／m1有机氯农药＋1．0μg／ml拟除虫菊酯农药）三个水平添加时的平均回收率（n=5）分别为80．9％～118．5％、88．4％～120．7％、80．9％～116．3％；相对标准偏差分别为2．09％～6．70％、1．89％～6．49％、1．98％～11．87％。该方法的检出限为：有机氯农药0．0004～0．0048mg／kg，拟除虫菊酯农药0．0033～0．0400mg／kg。     

正已烷萃取法测定进口水果中六六六、滴滴涕

采用气相色谱法（带有电子捕获检测器ECD），以正已烷、丙酮为提取溶剂，用浓硫酸磺化法净化提取液，对进口水果中的六六六、滴滴涕各4种异构体农药进行了多残留检测。结果表明：以正己烷与丙酮的混合提取剂的提取效果好，其平均回收率范围为93．7％-122．7％，相对标准偏差分别为1％-6％，在程序升温的条件下，8种农药可很好地分离，检出限范围为0．0006—0．006mg／kg，准确度和精确度均达到了进口水果中六六六、滴滴涕农药残留分析的要求。     

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.     

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     

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     

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,     

Anti-mutagenic compounds from corn

In previous studies with aflatoxin-contaminated corn an uncharacteristic response for AFB₁ in the Salmonella/microsomal mutagenicity assay (Ames test) was observed and the presence of anti-aflatoxin factors in the corn was suggested. In the current study, corn was extracted and fractionated using thin layer chromatography (TLC) using different developing solvent systems and the Ames test was used to monitor for anti-mutagenic activity in the corn fractions. Both Salmonella tester strains TA98 and TA100 with metabolic activation (S9) were used. Several corn fractions, at different stages in the isolation and purification process, showed anti-mutagenic dose-responses when exposed to pure AFB₁. Corn extracts were non-toxic to the tester strains and TLC fractions that showed the best anti-mutagenic dose-responses were selected for further partial characterization analyses.