应用氢化物发生-微波等离子体原子发射光谱分析食用菌中总砷含量

建立氢化物发生-微波等离子体原子发射光谱（microwave plasma-atomic emission spectroscopy,MP-AES）测定食用菌中总砷含量的分析方法。食用菌样品经湿法消解后采用预还原混合溶液（50 g/L硫脲＋10 g/L碘化钾）将砷（V）还原砷（III）,采用多模式样品导入系统将砷（III）转变为气态三氢化砷,采用MP-AES进行测定。选择As 188.979 nm为MP-AES的分析谱线避开光谱重叠干扰,应用快速线性干扰校正模型校正背景干扰。砷的检出限为0.93 μg/L,不同种类食用菌中总砷含量在0.087～0.482 mg/kg之间。分析方法用于国家标准参考物质GBW10022（蒜粉）中的总砷分析,测定结果与GBW10022（蒜粉）的认定值一致,验证本实验的准确性。本实验为测定食用菌中总砷含量提供快速、准确、可靠的高通量分析方法。MP-AES使用氮气发生器从空气中产生的氮气为等离子体工作气,具有运行成本低的明显优势。     

微波等离子体-原子发射光谱法测定 食用植物油中的多种微量金属元素

摘要：研究简单快速测定食用植物油中多种微量金属元素的方法。食用植物油样品经微波酸消解处理后采用微波等离子体-原子发射光谱法（MP-AES）测定消解液中微量金属元素Mg、Al、K、Na、Ca、Fe、Cu、Zn、Sr、Mn的含量。通过选择各元素的分析波长避免了大量光谱干扰,利用快速线性干扰校正（FLIC）技术校正了潜在光谱干扰和背景干扰,选择Y、La、Lu为内标元素校正基体效应,采用加标回收实验并利用电感耦合等离子体质谱法（ICP-MS）的对比分析结果评价了方法的准确性。结果表明,各元素的检出限在0.12~4.29 μg/L之间,加标回收率在95.4%~104.0%之间,相对标准偏差（RSD）小于等于4.1%,MP-AES和ICP-MS的分析结果无显著性差异。建立的分析方法具有分析成本低、检出限低、准确性好等特点,可用于食用植物油中多种微量金属元素含量的测定。     

微波等离子体原子发射光谱测定啤酒中的常量和微量金属元素

建立微波等离子体原子发射光谱（microwave plasma-atomic emission spectroscopy,MP-AES）测定啤酒中4?种常量金属元素（Na、Mg、K、Ca）和10?种微量金属元素（Al、Mn、Fe、Ni、Cu、Zn、Sr、Cd、Ba、Pb）的分析方法。在密闭的消解罐内采用质量分数65% HNO3溶液对啤酒样品进行微波消解,选择分析元素的波长并结合快速线性干扰校正技术校正光谱干扰,通过加入内标元素校正基体效应,采用电感耦合等离子体质谱（inductively coupled plasma-mass spectrometry,ICP-MS）法对相同的样品溶液进行分析比较验证方法的准确性。在优化条件下,分析元素的检出限在0.13～230?μg/L之间,加标回收率为95.6%～104%,相对标准偏差为1.8%～4.0%。采用MP-AES成功测定啤酒样品中的常量和微量金属元素,并与ICP-MS的测定结果基本一致。方法具有简单快速、稳定性好、运行成本低、准确性好的特点,适合于啤酒中多种金属元素的高通量分析。     

微波等离子体原子发射光谱法(MP-AES)测定出口营养强化剂中十种元素

建立了一种微波等离子体原子发射光谱(MP-AES)测定出口营养强化剂中元素快速分析的方法,测定了八种石家庄辖区出口营养强化剂中Zn、Cd、Cu、Ni、Fe、Pb、Mn、V、Al、Cr十种元素的含量。实验结果表明,样品测定值均满足试验要求,各元素标准曲线线性良好,线性相关系数R2≥0.999,加标回收率在80.00%~115.00%之间,相对标准偏差(RSD)小于5%。且MP-AES法使用氮气作为助燃气,比传统方法安全经济。该方法可一次测定十种元素,精密度及回收率良好、经济、快捷,可作为营养强化剂元素快速分析方法。     

ICP-MS法直接测定氢化植物油中的重金属元素

建立了煤油稀释样品,电感耦合等离子体质谱(ICP-MS)法直接测定氢化植物油中Cr、Ni、Cu、As、Cd、Sb、Hg、Pb等8种重金属元素的分析方法。通过向等离子体气中混入20%的氧气以消除有机样品中高碳的影响,详细地研究了在加氧情况下载气流速、等离子体功率和样品提升量对等离子体稳定性的影响,采用碰撞/反应池(CRC)技术校正了多原子离子质谱干扰,选择内标法校正了基体效应。结果表明,8种重金属元素定量标准曲线的线性相关系数不小于0.999 8,检出限在0.13~2.06 ng/g之间,RSD为2.26%~4.81%,加标回收率在91.23%~106.55%之间。方法能满足氢化植物油中重金属元素的分析要求。     

电感耦合等离子体原子发射光谱法测定不锈钢中镍含量

介绍电感耦合等离子体原子发射光谱法测定不锈钢镍含量。给出实验应注意的问题:(1)测量前优化仪器工作参数;(2)试样称量为0.100 0 g,定容至100 mL;(3)分析谱线波长选择221.647 nm。实验结果线性相关系数大于0.999 5,相对标准偏差小于1.00%,镍元素线性关系和精密度良好。电感耦合等离子体原子发射光谱法简便、快速、准确,适用于不锈钢镍质量分数为2.00%～25.00%的测定。     

电感耦合等离子体质谱测定茎瘤芥(榨菜)中无机元素的研究

采用微波消解法处理茎瘤芥样品,建立了电感耦合等离子体质谱(ICP-MS)法同时测定其中Mg、P、K、Ca、Mn、Fe、Ni、Cu、Zn、As、Se、Mo、Cd、Sb、Hg、Pb共16种无机元素含量的分析方法。采用碰撞反应池(CRC)技术消除了多原子离子质谱干扰,以Rh为内标元素校正了质谱分析中基体效应并补偿了信号漂移,研究了不同碰撞/反应气流速对待测元素预估检测限(EDL)的影响。16种待测元素的检出限为0.006~0.20μg/L,利用标准参考物质(GBW10049,大葱)验证了分析方法的准确度和精密度,结果表明,标准物质的分析结果与参考值基本一致,方法可快速、灵敏、准确地测定茎瘤芥中16种无机元素含量。     

电感耦合等离子体质谱法测定固体饮料中复合磷酸盐含量的研究

建立了电感耦合等离子体质谱法测定固体饮料中复合磷酸盐含量的分析方法。样品经微波消解赶酸后进行分析,应用碰撞/反应池技术有效地消除了多种原子离子对磷元素的干扰,并选用Sc、Bi、Rh元素为内标混合液校正基体干扰和漂移。研究结果表明:本法的检出限为0.11 mg/L,加标回收率在90.0%~96.8%之间,测定值的相对标准偏差(n=6)在1.63%~2.80%之间;具有检出限低,灵敏度高、线性范围宽、快速等优点,能确保实验数据的准确性和稳定性,满足固体饮料中复合磷酸盐含量的分析要求。     

微波消解-电感耦合等离子体质谱法测定衢枳壳中17种微量元素的含量

目的建立微波消解-电感耦合等离子体原子发射光谱-质谱法测定衢枳壳药材中17种元素的分析方法。方法采用微波消解进行前处理,电感耦合等离子体原子发射光谱-质谱联用技术结合内标元素校正基体抑制效应,外标法定量。结果在0.5～500μg/L的浓度范围内,各元素有良好的线性关系,相关系数均大于0.999。各元素的检出限为2ng/L～1μg/L,加标回收率为67.3%～109%,相对标准偏差均小于15%。结论本研究建立的方法准确、可靠、灵敏度高,适用于衢枳壳基质中多元素测定。     

微波等离子体-原子发射光谱仪(MP-AES)测定葡萄酒中10种金属元素方法

采用常压消解-微波等离子体原子发射光谱仪(MP-AES)测定了葡萄酒中铅、镉、锰、铁、铜、锌、钒、铝、铬、镍10种金属元素,实验结果表明,标准曲线均有良好线性关系,10种元素方法回收率为85.0%~120.5%,RSD%为0.41%~3.12%。方法简便快捷、成本低廉。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

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     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.