固相萃取-超高效液相色谱-串联质谱法测定土壤中的高氯酸盐

目的建立了一种同位素稀释超高液相色谱-串联质谱法测定土壤中高氯酸盐含量的分析方法。方法试样经0.2%乙酸水溶液和二氯甲烷提取,上清液经HLB小柱净化,液相色谱-串联质谱法测定,内标法定量。结果高氯酸盐在0.1～100μg/L浓度范围内线性关系良好,相关系数为0.9995,检出限为0.3μg/kg,定量限为1.0μg/kg,加标回收率在85.2%～102%,相对标准偏差(relative standard deviation, RSD)小于8.0%。结论该方法简便、可靠、稳定,可用于土壤中高氯酸盐含量的测定。     

超高效液相色谱-串联质谱法同时测定食品中的氯酸盐和高氯酸盐残留量

目的 建立了超高效液相色谱-串联质谱法测定食品中氯酸盐和高氯酸盐残留量的方法。方法 食品样品经纯水溶解,乙腈提取,固相萃取柱净化,超高效液相色谱-串联质谱测定。采用多反应监测模式,电喷雾电离源负离子模式,内标法定量。结果 氯酸盐在0~200 ng/mL、高氯酸盐在0~100 ng/mL范围内线性关系良好,相关系数(r)均大于0.99,检出限(S/N=3)为氯酸盐6.0μg/kg和高氯酸盐1.0 μg/kg,定量限(S/N≥10)为氯酸盐18.0μg/kg和高氯酸盐3.0 μg/kg。以不含氯酸盐和高氯酸盐的样品作为空白样品进行添加回收试验,氯酸盐的回收率为83.7%~106.9%,相对标准偏差(RSD)为2.9%~6.2%,高氯酸盐的回收率为87.8%~112.8%,相对标准偏差(RSD)为2.9%~7.5%。结论 该方法不但可以有效排除复杂基体的干扰,而且简单、灵敏、稳定。     

离子色谱-串联质谱法测定生活饮用水中的高氯酸盐、氯酸盐和溴酸盐

目的建立离子色谱-串联质谱法同时测定生活饮用水中高氯酸盐、氯酸盐和溴酸盐含量的分析方法。方法选用高容量、亲水性IonPacAS-20阴离子交换柱为分析柱对高氯酸盐、氯酸盐和溴酸盐进行分离,以淋洗液自动发生器在线产生KOH为淋洗液进行洗脱。采用外接水模式,串联质谱进行检测。采用电喷雾离子源负离子模式和多反应监测测定,外标法定量。结果高氯酸盐、氯酸盐和溴酸盐的线性范围分别为0.04～20.00μg/L, 0.02～10.00μg/L, 0.04～20.00μg/L,相关系数r~20.999,检出限分别为0.02、0.01和0.02μg/L,定量限分别为0.04、0.02和0.04μg/L,加标回收率在90.0%～98.8%,相对标准偏差(relative standard deviation,RSD)小于8.0%。结论该方法简便、可靠、稳定、灵敏度高,可用于生活饮用水中高氯酸盐、氯酸盐和溴酸盐含量的快速测定与确认。     

同位素稀释-超高效液相色谱-串联质谱法测定茶叶中的高氯酸盐

目的建立茶叶中高氯酸盐的超高效液相色谱-串联质谱测定方法。方法茶叶中高氯酸盐用0.2%乙酸提取,经石墨炭黑柱净化,优选Synergi~(TM)MAX-RP柱(4.6 mm×250 mm,4μm)为分析柱,以超高效液相色谱-串联质谱法测定,内标法定量。结果高氯酸盐在0.25~50.0μg/L范围内线性良好,回归方程y=1.569x+0.0268,相关系数r~2=0.999 6。加标浓度为0.05~0.50 mg/kg时,回收率95.6%~120.0%,相对标准偏差(RSD)1.9%~17.5%。检出限为2.5μg/kg。结论本方法前处理简单、准确、灵敏度高,适用于茶叶中高氯酸盐的测定。     

UPLC-MS/MS测定特殊医学用途配方乳粉中氯酸盐和高氯酸盐

建立一种特殊医学用途配方乳粉中氯酸盐和高氯酸盐测定的超高效液相色谱-串联质谱法。样品用0.1%（体积比）甲酸水-乙腈提取，经Oasis PRiME HLB固相萃取柱净化，复合离子交换色谱柱分离后，以乙腈-20 mmol/L甲酸铵溶液为流动相进行梯度洗脱，多反应模式检测，同位素内标法定量。结果显示，氯酸盐和高氯酸盐在1～200 ng/mL质量浓度范围内呈良好的线性关系，相关系数大于0.999，检出限为3.75μg/kg，定量限为7.5μg/kg。氯酸盐和高氯酸盐在7.5、50、500、1 500μg/kg 4个加标水平回收率为97.1%～104.8%之间，相对标准偏差为2.55%～6.05%(n=6)。该方法简单快速、定量准确，能用于特殊医学配方乳粉中氯酸盐和高氯酸盐含量的测定。     

微波消解-电感耦合等离子体质谱法测定面制食品中的铝含量

目的建立微波消解-电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)测定面制食品中Al元素含量的方法。方法面制食品样品经微波消解后,使用ICP-MS测定,并对方法的线性范围、检出限、精密度和回收率等进行考察。结果 Al元素在20.0~200.0μg/kg范围内的相关系数大于0.999,线性良好,方法检出限为0.2μg/kg,定量限为0.6μg/kg。加标浓度为5.0~15.0μg/kg时,回收率在99.3%~105.0%之间,且相对标准偏差(relative standard deviation,RSD)在0.93%~2.11%之间。结论该检测方法简单、快速、准确、灵敏度高,适用于面制食品中Al元素的测定。     

高效液相色谱-串联质谱法测定蜂蜜中的甲基乙二醛

目的建立一种蜂蜜中甲基乙二醛的高效液相色谱-串联质谱法的测定方法。方法采用高效液相色谱-串联质谱法测定蜂蜜中的甲基乙二醛,蜂蜜样品直接用水提取,2,3-二氨基萘为衍生化试剂,常温下避光反应8 h以上,以0.1%甲酸水-乙腈为流动相,色谱柱分离,通过质谱电喷雾离子源,正离子模式进行定性和定量分析。结果甲基乙二醛的线性范围为0.05~1.0μg/m L,相关系数0.999以上,线性良好,检出限为0.2 mg/kg,定量限为0.5 mg/kg。回收率92.4%~97.5%之间,相对标准偏差(relative standard deviation,RSD)均小于1.3%。结论该方法的精密度、回收率均满足要求,适用于大批量样品的快速检测。     

液液萃取-气相色谱-质谱法同时测定奶嘴中12种N-亚硝胺释放量

目的建立液液萃取-气相色谱-质谱法同时测定奶嘴中12种N-亚硝胺释放量的分析方法。方法样品经人工唾液提取,采用HP-INNOWax色谱柱进行分离,采用分流进样的方式对样品进行上机分析。结果在浓度25~150μg/L内12种N-亚硝胺的线性关系良好,相关系数均大于0.995。12种N-亚硝胺的检出限为2μg/kg,定量限为5μg/kg。方法回收率在94.44%~103.93%之间,相对标准偏差(relative standard deviation,RSD)在1.39%~2.73%之间。结论该方法操作简单,灵敏度高,准确可靠,适用于奶嘴中12种N-亚硝胺的测定。     

高效液相色谱-串联质谱法测定牛奶中的高氯酸盐和氯酸盐

建立了高效液相色谱-串联质谱(HPLC-MS/MS)同时检测牛奶中高氯酸盐和氯酸盐的分析方法。样品用乙腈-甲醇-乙酸溶液(90∶10∶1,体积比)提取同时沉淀蛋白,正己烷去除脂肪,在非修饰多孔石墨化碳柱(Hypercarb)上进行分离,然后采用电喷雾离子化三重四极杆串联质谱测定。结果表明,高氯酸盐和氯酸盐在各自的线性范围内峰面积与其质量浓度线性关系良好,相关系数(r~2)大于0.999;高氯酸盐的定量限(S/N=10)为0.8μg/kg,氯酸盐的定量限为3μg/kg;两种化合物的平均回收率为83.8%~97.3%,相对标准偏差为2.2%~8.8%。     

茶叶中蒽醌的内标-气相色谱-串联质谱法测定

建立测定茶叶中蒽醌的快速气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)。茶叶样品加入蒽醌-D8同位素内标应用液后,经乙腈提取,使用QuEChERS方法净化,氮吹浓缩后,在选择多反应监测模式(multiple reaction monitoring,MRM)下扫描,以HP-5MS(30 m×250μm,0.25μm)色谱柱进行分离,内标法定量。蒽醌在10 ng/mL～200 ng/mL范围内线性关系良好,相关系数(r=0.999 5)。该方法的检出限为3μg/kg,定量限为10μg/kg,加标回收率在87.1%～98.4%之间,加标回收试验相对标准偏差(relative standard deviation,RSD)在1.23%～4.12%之间。该方法适用于茶叶中蒽醌的定性定量检测。     

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.