Qu ECh ERS EMR-Lipid结合LC-MS/MS测定鸡蛋中磺胺类和喹诺酮类药物残留

采用Qu ECh ERS EMR-Lipid技术处理样品,建立快速检测鸡蛋中14种磺胺类药物和16种喹诺酮类药物残留的液质联用检测方法。将鸡蛋样品用2%甲酸乙腈8 mL提取,再加入0.5 mL pH 7.0、0.1 mol/L的EDTA缓冲液震荡,用Qu ECh ERS EMR-Lipid快速样品提取技术净化,最后用0.2%甲酸溶液(A相)和乙腈溶液(B相)作为流动相进行梯度洗脱,采用电喷雾离子源的动态多反应监测模式(dynamic MRM)对30种磺胺类药物和喹诺酮类药物进行定性和定量分析。结果显示,30种抗生素添加水平在8~32μg/kg的回收率为50.09%~102.11%,相对标准偏差小于15.66%,方法检出限为0.00131~0.09717μg/kg。建立的鸡蛋中磺胺类药物和喹诺酮类药物残留检测的检测方法前处理简单易行,便于操作,方法精密度高,可以满足对鸡蛋中磺胺类药物和喹诺酮类药物快速、准确的检测要求,并适合大批量样品的准确定性和定量分析检测。     

UPLC-MS/MS法同时检测水产品中喹诺酮类药物残留

利用UPLC-MS/MS技术建立一种同时检测水产品中喹诺酮类药物残留的分析方法.对样品进行前处理及分离条件的优化,样品经柠檬酸磷酸盐缓冲液(Mcllvaine)超声提取,采用固相萃取(SPE)方法净化提取液,并对目标物质进行富集,用UPLC-MS/MS法检测.结果表明:依诺沙星、奥索利酸、培氟沙星、帕珠沙星、氟罗沙星含量在3～300 μg/kg 范围,萘啶酸、氟甲喹含量在0.5～50 μg/kg 范围,其余13种喹诺酮类化合物含量在1～100μg/kg范围均具有良好的线性关系,相关系数0.9981～0.9999,定量限(LOQ)0.34～8.13 μg/kg.药物含量在5～150μg/kg范围,除氟甲喹、萘啶酸外,其它喹诺酮的回收率均在63.6%～92.8%之间,相对标准偏差1.51%～11.32%.该方法可满足水产品中喹诺酮类药物多残留检测的要求.     

QuEChERS HPLC-MS/MS法测定禽肉中9种喹诺酮类兽药残留量

建立Qu ECh ERS-液相色谱串联质谱法同时检测禽肉中的丹诺沙星、恩诺沙星、沙拉沙星、环丙沙星、氧氟沙星、诺氟沙星、依诺沙星、培氧沙星、双氟沙星9种喹诺酮类兽药残留量方法。样品以乙腈、EDTA-Mcllvaine和乙酸为提取试剂,无水硫酸钠为脱水剂,C18为吸附剂进行净化,以甲醇-0.1%甲酸水为流动相,反相C18色谱柱分离,正离子多反应监测模式进行质谱分析。9种喹诺酮在1.0μg/kg~200μg/kg范围内具有良好的线性关系,相关系数(r2)均在0.993以上。检出限范围为0.07μg/kg~0.20μg/kg,定量限范围在0.23μg/kg~0.67μg/kg之间。平均回收率介于70.8%~93.0%之间,相对标准偏(RSD)低于8.9%。该方法适合于检测禽肉中的喹诺酮类药物残留量的测定。     

超高效液相色谱-串联质谱测定猪肉中16种喹诺酮药物残留量

建立同时测定猪肉中萘啶酸、恶喹酸、依诺沙星、氟甲喹、诺氟沙星、环丙沙星、洛美沙星、丹诺沙星、恩诺沙星、氧氟沙星、沙拉沙星、二氟沙星、麻保沙星、培氟沙星、司帕沙星、奥比沙星16种喹诺酮类药物残留的超高效液相-串联质谱(ultra performance liquid chromatography-tandem mass spectrophy,UPLC-MS/MS)的检测方法。样品采用乙酸-乙腈(1∶99,V/V)一次性振荡提取,用弱阴离子固相萃取柱净化,内标法定量。结果表明:16种喹诺酮药物的检出限为0.2μg/kg,定量限为0.8μg/kg,空白猪肉中添加2.0、5.0、10.0μg/kg水平,16种喹诺酮的回收率在70%~120%。该方法分析速度快、样品前处理干净、杂质污染少,可用于猪肉样品中喹诺酮类的残留检测。     

羊奶及奶粉中27种β-受体激动剂类药物残留UPLC-MS/MS检测方法

采用超高效液相色谱串联质谱建立羊奶及奶粉中吡布特罗、丙卡特罗、瑞普特罗、克伦普罗、奥达特罗等27种β-受体激动剂类药物残留检测方法。样品经过1%甲酸乙腈提取、Oasis PRi ME HLB柱净化后,经Acquity UPLC BEH C18(100 mm×2.1 mm,1.7μm)分离,以甲醇和0.1%甲酸水溶液为流动相进行梯度洗脱,多通道MRM信号采集模式,27种β-受体激动剂类药物能在10.5 min内出峰完好,在1.0~100.0μg/L浓度范围内,27种β-受体激动剂类药物线性良好,相关系数均在0.993以上;羊奶中最低定量限均低于0.5μg/kg,通过0.5、2.5、5.0μg/kg三个浓度的加标回收实验表明,回收率为65.7%~119%,批内变异系数为0.79%~10.4%,批间变异系数为2.13%~15.7%。奶粉中最低定量限均低于2.0μg/kg,通过2.0、10.0、20.0μg/kg三个浓度的加标回收实验表明,回收率为60.5%~109%,批内变异系数为1.91%~12.4%,批间变异系数为3.06%~17.2%。所建立方法为一种高通量检测羊奶及奶粉中β-受体激动剂类药物残留确证分析方法。     

同位素内标-超高效液相色谱串联质谱法测定禽类食品中喹诺酮与四环素残留量

摘 要：目的 建立测定禽类食品中11种喹诺酮与4种四环素兽药残留的超高效液相色谱-串联质谱(ultra performance liquid chromatography-tandem mass spectrometry，UPLC-MS/MS)分析方法。方法 鸡肉和鸡蛋样品经Mcllvaine-Na2EDTA缓冲液提取，7%钨酸钠溶液沉淀蛋白，HLB柱净化后，喹诺酮类药物采用10 mmol/L乙酸铵(含0.1%甲酸，v/v)与甲醇为流动相，四环素类药物采用0.1%甲酸与乙腈为流动相。两种类型药物均采用电喷雾电离，正离子扫描，多离子反应监测模式，基质匹配同位素内标，标准曲线法定量。结果 15种兽药残留在0.1~50.0 μg/L的浓度范围内线性良好，相关系数r2均大于0.9927，检出限范围为0.05~0.20 μg/kg，平均回收率为60.6％~117.9％，相对标准偏差范围为0.51%~15.3%。采用建立的方法检测安徽省市售2016~2018年的鸡肉和鸡蛋样品中喹诺酮与四环素残留，检测结果通过食品安全指数(international foundation for science ，IFS)评估，发现鸡肉和鸡蛋中喹诺酮类IFS均值分别为0.00048 μg/kg?bw?d与0.000097 μg/kg?bw?d，四环素类IFS均值分别为0.00073 μg/kg?bw?d与0.00098μg/kg?bw?d，均小于1，说明其膳食暴露风险较低。结论 该方法的样品前处理沉淀蛋白完全，净化效果好，减少了基质效应的影响，适用于大批量禽类食品中喹诺酮与四环素兽药残留量的快速测定。     

UHPLC-MS/MS同位素内标法测定豆制品中16种喹诺酮类药物残留

建立了同时测定豆制品中16种喹诺酮类药物(依诺沙星、氟罗沙星、诺氟沙星、氧氟沙星、培氟沙星、环丙沙星、洛美沙星、达氟沙星、恩诺沙星、奥比沙星、沙拉沙星、双氟沙星、司帕沙星、恶喹酸、萘啶酸、氟甲喹)残留的同位素内标结合超高效液相色谱-串联质谱法检测方法。样品用0.1mol/L EDTAMcllvaine缓冲溶液提取,经HLB固相小柱净化,氮吹定容后,采用超高压反相C18色谱柱分离,质谱分析采用电喷雾电离,正离子扫描,多反应监测模式,内标法定量。在优化条件下,16种喹诺酮类药物在0.50～50.00ng/mL的质量浓度范围内线性良好,相关系数R2均在0.99以上,检出限(LOD)为0.5μg/kg,在检出限的1倍、2倍和10倍添加浓度下,16种喹诺酮类药物平均回收率在80.7%～107.1%之间,相对标准偏差(RSD,n=6)在1.5%～10.6%之间。该方法前处理简便快速,选择性好,灵敏度、回收率和精密度高,适用于豆制品中喹诺酮类药物残留的定性定量检测。     

液相色谱-串联质谱法检测蜂蜜中15种喹诺酮类和17种磺胺类药物残留

目的建立同时测定蜂蜜中15种喹诺酮和17种磺胺类药物残留的液相色谱-串联质谱(liquid chromatography-tandem mass spectrometry,HPLC-MS/MS)检测方法。方法样品经过磷酸盐缓冲溶液(pH=8)提取,过HLB(hydrophile-lipophile balance)固相萃取柱净化。以CORTECS C18色谱柱(2.1 mm×100 mm,1.6μm)分离,以5 mmol乙酸铵、0.1%甲酸水(A)和0.1%甲酸-乙腈(B)作为流动相进行梯度洗脱。质谱分析以电喷雾为离子源(electrospray ionization,ESI+),采用多反应监测(multiple reaction monitoring,MRM)。结果本方法在15 min内完成32种目标化合物的分离。15种喹诺酮和17种磺胺类药物在1.0、5.0和10.0μg/kg添加水平的回收率为54.9%~122.5%,相对标准偏差(relative standard deviation,RSD)小于18.7%(n=6),方法检出限为0.4μg/kg,定量限为1.0μg/kg。结论该方法快速、准确、灵敏,适合测定蜂蜜中喹诺酮和磺胺类药物残留。     

QuEChERS-超高效液相色谱-串联质谱法同时测定畜禽肉中11 种喹诺酮类兽药残留

建立一种超高效液相色谱-串联质谱法测定畜禽肉中恩诺沙星、环丙沙星、氧氟沙星、培氟沙星、诺氟沙星、洛美沙星、沙拉沙星、双氟沙星、司帕沙星、氟罗沙星和达氟沙星共11 种喹诺酮类兽药残留的检测方法。畜禽肉样品经2%甲酸-乙腈均质提取,离心沉淀后上清液经QuEChERS净化剂净化后,经快速溶剂蒸发系统浓缩,采用Waters BEH C18色谱柱（2.1 mm×50 mm,1.7 μm）分离,以0.1%甲酸-水和0.1%甲酸-乙腈为流动相进行梯度洗脱,电喷雾离子源电离,多反应监测模式采集信号,内标法定量。结果表明：11 种喹诺酮类兽药在2～80 ng/mL质量浓度范围内线性关系良好（R2＞0.99）,方法的检出限和定量限分别为0.5～2.0 μg/kg和1.5～6.0 μg/kg;空白样品加标量为10、25、50 μg/kg 3 个水平时,11 种喹诺酮类兽药的平均加标回收率为74.52%～106.83%,相对标准偏差为1.8%～8.7%（n=6）。该方法检测过程简单快捷、准确度好、灵敏度高,适用于畜禽肉中喹诺酮类兽药残留的检测。     

液相色谱-串联质谱法测定猪肉中13种磺胺类药物残留

利用液相色谱-电喷雾串联质谱建立猪肉中13种磺胺类药物残留的同时、快速分析方法.猪肉样品中的残留药物用1%乙酸-乙腈均质提取,浓缩后用0.1%甲酸-乙腈定容,并用正己烷液-液分配除脂后,用Kinetex C18色谱柱(100mm×2.1mm,2.6μm)分离,以0.1%甲酸-乙腈作为流动相梯度洗脱,采用电喷雾正离子电离,多反应监测模式检测,基质匹配外标法定量.13种磺胺类药物在1~300μg/kg范围内线性关系良好,定量限均小于10μg/kg.在1、2μg/kg和10μg/kg这3个添加水平下,回收率在60.0%~78.1%之间,相对标准偏差(RSD)在0.24%~8.88%之间.此方法操作简便,灵敏度、准确度、精密度均满足残留分析的要求.     

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.