超高效液相色谱-串联质谱法检测小米及面粉中4种镰刀菌毒素

目的建立小米及面粉中脱氧雪腐镰刀菌烯醇(deoxynivalenol,DON)、3-乙酰脱氧雪腐镰刀菌烯醇(3-acetyl deoxidized snow-scylienol,3-AC-DON)、15-乙酰脱氧雪腐镰刀菌烯醇(15-acetyl deoxidized snow-scyloxanol,15-AC-DON)和玉米赤霉烯酮(zearalenone,ZEN)的超高效液相色谱-串联三重四极杆质谱测定方法。方法经乙腈-水(84:16,V:V)提取样品,通过多功能净化柱净化,以BEH C_(18)柱(2.1 mm×100 mm,1.7μm)分离,流动相为0.2%氨水:乙腈梯度洗脱,电喷雾离子(multiple reaction monitoring,MRM)模式检测。结果玉米赤霉烯酮检出限为0.1μg/kg,定量限为0.3μg/kg,线性范围为2.0～30.0μg/L;脱氧雪腐镰刀菌烯醇及其衍生物的检出限为0.2μg/kg,定量限为0.6μg/kg,线性范围为10.0～150.0μg/L。加标回收率88.9%～106.0%。结论本方法快速、准确、灵敏度高,能满足4种镰刀菌毒素的同时检测。     

小麦和玉米中脱氧雪腐镰刀菌烯醇与雪腐镰刀菌烯醇的免疫亲和净化-高效液相色谱检测方法研究

目的建立小麦和玉米中脱氧雪腐镰刀菌烯醇与雪腐镰刀菌烯醇的免疫亲和净化-高效液相色谱检测方法。方法样品经纯水提取后,用免疫亲和柱净化,经甲醇洗脱,在C18色谱柱上等度洗脱分离,采用紫外检测器检测。结果标准曲线在0.1~2.0 mg/kg范围内线性良好。小麦基质中脱氧雪腐镰刀菌烯醇的回收率为72.8%~110.1%,精密度为3.6%~10.8%,实验室内Hor Rat值为0.24~0.48;玉米中脱氧雪腐镰刀菌烯醇的回收率为72.2%~90.6%,精密度为1.2%~5.2%,实验室内Hor Rat值为0.07~0.31。小麦基质中雪腐镰刀菌烯醇的回收率为58.9%~100.4%,精密度为3.6%~11.3%,实验室内Hor Rat值为0.23~0.63;玉米中雪腐镰刀菌烯醇的回收率为56.9%~91.9%,精密度为2.5%~7.8%,实验室内Hor Rat值为0.11~0.43。结论该方法具有灵敏度高、重现性好、操作简便、准确可靠等特点,适用于小麦和玉米中脱氧雪腐镰刀菌烯醇与雪腐镰刀菌烯醇的测定。     

脱氧雪腐镰刀菌烯醇酶联免疫检测方法的建立

应用抗脱氧雪腐镰刀菌烯醇单克隆抗体12D1建立了竞争间接ELISA方法,用于检测小麦、玉米中的脱氧雪腐镰刀菌烯醇(DON),最低检出限为20ng/mL,检测范围为20￣460ng/mL。用蒸馏水提取掺合DON(250￣4000ng/g)的小麦样品,回收率为82.1%￣96.6%,变异系数为0.6%￣7.1%。     

谷物中DON、ZEA毒素的净化、检测、毒性与生物脱毒技术的研究

禾谷镰刀菌在侵染谷物过程中所产生的次生代谢产物——单端孢霉烯族毒素[脱氧雪腐镰刀菌烯醇(deoxynivalenol,DON)、雪腐镰刀菌烯醇(nivalenol,NIV)]以及玉米赤霉烯酮(zearalenone,ZEA)是世界上粮食安全的一个重大问题。毒素经固液萃取技术提取后,需要通过净化处理才能进行检测与分析。目前有多种净化技术用于毒素的净化,如免疫亲和柱、多功能净化柱等固相萃取柱等,以及广泛使用且简便经济的QuEChERS前处理技术。本文还介绍了禾谷镰刀菌毒素中DON、ZEA的检测方法、产毒条件、毒性以及生物脱毒技术等方面的研究进展,旨在开发与应用更安全、高效、经济的生物脱毒技术进行毒素的防御与去除,以提供安全、优质的粮食与食品。     

谷物中DON、ZEA毒素的净化、检测、 毒性与生物脱毒技术的研究

禾谷镰刀菌在侵染谷物过程中所产生的次生代谢产物——单端孢霉烯族毒素[脱氧雪腐镰刀菌烯醇(deoxynivalenol, DON)、雪腐镰刀菌烯醇(nivalenol, NIV)]以及玉米赤霉烯酮(zearalenone, ZEA)是世界上粮食安全的一个重大问题。毒素经固液萃取技术提取后, 需要通过净化处理才能进行检测与分析。目前有多种净化技术用于毒素的净化, 如免疫亲和柱、多功能净化柱等固相萃取柱等, 以及广泛使用且简便经济的QuEChERS前处理技术。本文还介绍了禾谷镰刀菌毒素中DON、ZEA的检测方法、产毒条件、毒性以及生物脱毒技术等方面的研究进展, 旨在开发与应用更安全、高效、经济的生物脱毒技术进行毒素的防御与去除, 以提供安全、优质的粮食与食品。     

北京地区部分市售食用植物油中玉米赤霉烯酮和脱氧雪腐镰刀菌烯醇的污染状况分析

目的分析北京市售植物油中玉米赤霉烯酮和脱氧雪腐镰刀菌烯醇的污染状况。方法实验采用同位素稀释-超高效液相色谱-串联质谱法,在多反应监测模式下对所采集玉米油、花生油、调和油等食用油样中的玉米赤霉烯酮(ZEN)、脱氧雪腐镰刀菌烯醇(DON)进行了检测,并对其污染现状进行分析。结果 ZEN和DON在3~500 ng/mL浓度范围内线性良好,相关系数为0.999,加标回收率为95.05%~107.10%,ZEN和DON方法的检出限分别为0.03μg/kg和0.9μg/kg;ZEN和DON方法的定量限分别为0.1μg/kg和3μg/kg。对北京市售30个油样检测结果表明,DON为未检出,ZEN检出率为100%,最高含量为333μg/kg,最低含量为1.95μg/kg,平均含量为67.7μg/kg,低于欧盟规定的限量标准400μg/kg。结论通过分析食用油中真菌毒素的含量状况,初步了解了北京市售植物油中玉米赤霉烯酮和脱氧雪腐镰刀碱烯醇的污染状况。     

免疫亲和柱净化—高效液相色谱法同时检测小麦中脱氧雪腐镰刀菌烯醇及其衍生物

建立脱氧雪腐镰刀菌烯醇(DON)及其衍生物3-乙酰基—脱氧雪腐镰刀菌烯醇(3-ADON)和15-乙酰基—脱氧雪腐镰刀菌烯醇(15-A-DON)的免疫亲和柱净化—高效液相色谱同时检测方法。小麦样品经超纯水提取、免疫亲和柱净化、吹干、定容后,用配有紫外检测器的高效液相色谱仪进行DON、3-A-DON和15-A-DON三种毒素的同时检测,并与液相色谱质谱法比对。结果表明:该方法检出限,DON、3-A-DON和15-A-DON均为100μg/kg,样品加标回收率范围86.6%~96.5%,变异系数小于10%,具有较好的准确性和精密度。该方法简单、快速、灵敏度高、选择性好,适用于小麦中DON、3-A-DON和15-A-DON的同时检测。     

脱氧雪腐镰刀菌烯醇及其乙酰化产物的培养提取及制备

以禾谷镰刀菌Fusarium graminearum大型分生孢子定量接种大米培养物,制备毒素粗提液,采用硅胶柱一步洗脱分离、分段收集可同时获得脱氧雪腐镰刀菌烯醇（deoxynivalenol,DON）和乙酰化脱氧雪腐镰刀菌烯醇（acetyldeoxynivalenol,AcDON）,采用一步结晶法即可分别制备获得毒素纯品,并经红外光谱法、液相色谱-质谱联用技术及核磁共振氢谱等分析确证,液相色谱分析表明两种毒素纯度均大于98%。该培养提取及分离制备方法改变了常规多步骤繁琐过程,提供了一种切实有效的、大量制备纯化DON及乙酰化DON毒素的简便方法。     

超高效液相色谱串联质谱法检测谷物中8种真菌毒素

建立了液质联用法同时测定脱氧雪腐镰刀菌烯醇、3-乙酰基脱氧雪腐镰刀菌烯醇、15-乙酰基脱氧雪腐镰刀菌烯醇、黄曲霉毒素B_1、B_2、G_1、G_2、玉米赤霉烯酮共8种真菌毒素谷物中的含量。样品经乙腈-水溶液提取,通过多功能净化柱净化、Waters Acquity UPLC? BEH C18色谱柱分离、超高效液相色谱串联质谱系统测定,脱氧雪腐镰刀菌烯醇及其衍生物同位素内标法定量,黄曲霉毒素和玉米赤霉烯酮外标法定量。结果表明,8种真菌毒素在线性范围内线性相关性R~2≥0.999,检出限在0.3~1.0μg/kg之间,加标回收率在72.2%~101.7%之间,相对标准偏差在1.22%~9.69%之间。该方法操作简单、灵敏度高、回收率好,适用于谷物及其制品中多种真菌毒素的同时检测。     

高效液相色谱串联质谱法测定花生及制品中的五种真菌霉素

建立了高效液相色谱-串联质谱(HPLC-MS/MS)测定花生及制品中黄曲霉毒素B1、黄曲霉毒素M1、脱氧雪腐镰刀菌烯醇、赭曲霉毒素A、玉米赤霉烯酮五种真菌霉素的快速分析方法。用甲醇-水(55:45,V/V)对样品进行提取,采用真菌毒素免疫亲和柱萃取,在ESI+模式下采用多反应监测(MRM)模式进行检测。目标物在C18色谱柱上实现了有效分离,在6 min内完成一个样品的分析,相关系数(r2,n=6)大于0.999,检测结果稳定、灵敏。黄曲霉毒素B1、黄曲霉毒素M1、脱氧雪腐镰刀菌烯醇线性范围0.5~50.0μg/L,检出限为0.05μg/kg(LOD,S/N=3),赭曲霉毒素A、玉米赤霉烯酮线性范围5.0~100.0μg/L,检出限为0.5μg/kg(LOD,S/N=3),方法回收率为86.8~102.7%,精密度RSD为0.36~4.79%。该方法快速、灵敏,适用于花生及制品中黄曲霉毒素B1、黄曲霉毒素M1、脱氧雪腐镰刀菌烯醇、赭曲霉毒素A、玉米赤霉烯酮五种真菌霉素的检测与确证。     

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     

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     

Contamination of animal feed and food from animal origin with mineral oil hydrocarbons

Oils and fats used for the production of animal feed can become contaminated with mineral oil material originating from gas oils (C₁₈-C₃₅) or synthetic oils (poly alpha olefins, C₂₅ to beyond C₄₅). An important cause is assumed to be the discharge of waste oils, such as motor oil and hydraulic oils. Mineral oil material was analysed by on-line LC-GC-FID directly in the fat or in a raw extract from animal feed or foodstuffs. In Switzerland in summer/autumn 1999 concentrations in oils and fats for feed production were often found to be between 100 and 1000mg/kg. In the feeds, the average concentration was around 100mg/kg with values ranging up to a maximum of 1000mg/kg; few samples were free of contamination. In animal body fat, the average concentration determined in summer 1999 was 25mg/kg, with a maximum of 150mg/kg, although in samples from December 1999, contamination was substantially lower. In the fat phase of eggs, the average concentration was 30mg/kg, with a maximum of 80mg/kg. Paraffin oil is used for feed production, which may account for part of the contamination problem (e.g. eggs).