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《食品与药品》2016,(2)
目的建立保健食品胶囊壳中铬含量测定前处理方法和分析条件,了解重庆市辖区内在售胶囊剂保健食品胶囊壳中铬含量状况,并进行安全风险评估,为有关部门制定保健食品用明胶空心胶囊质量标准提供数据参考。方法随机抽取重庆市辖区在售胶囊剂保健食品121批,采用微波消解法进行样品前处理,以石墨炉原子吸收法测定胶囊壳中铬含量,并进行方法学研究。结合人体最大耐受剂量,进行安全风险评估。结果方法线性关系在5~50μg/L范围内良好,检出限为0.90μg/L,精密度和稳定性良好,回收率在92.3%~108.6%之间。121批样品胶囊壳中铬含量均低于2 mg/kg。结论该方法线性关系良好,检出限、精密度、稳定性和回收率均可满足分析要求。参照《中国药典》(2010年版)二部"明胶空心胶囊"项下限量标准(≤2 mg/kg)进行评价,均符合要求。按人体最大耐受剂量进行评估,抽查的保健食品胶囊壳中铬含量对人体健康无安全风险。 相似文献
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为优化食用明胶中微量铬测定方法,通过微波消解,湿法消解,干法灰化等3种前处理方法,采取原子吸收-石墨炉法和电感耦合等离子质谱法测定明胶中铬含量。结果表明,食用明胶经硝酸-双氧水消解体系进行微波密闭消解,采用原子吸收-石墨炉法测定其微量铬,铬在0~16 ng/mL浓度范围内线性关系良好,相关系数r~2=0.999 1,方法检出限为0.01 mg/kg,加标平均回收率98.7%,相对标准偏差1.7%(n=7),质控样测定结果接近其中值。 相似文献
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建立微波消解-石墨炉原子吸收光谱法测定大米中重金属铬含量的方法。采用微波消解法对样品进行消解,用石墨炉在波长357.9 nm处测定样品中铬的含量。结果表明,该方法线性关系良好,相关系数为0.999 7,检出限为0.006 mg/kg,定量限为0.02 mg/kg,回收率为81.6%~93.1%。该方法具有快速、简便、准确等优点,可用于大米中铬的含量测定。 相似文献
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目的建立微波消解-石墨炉原子吸收分光光度法测定固体、液体和软胶囊3种基质的保健食品中铝元素含量的分析方法。方法前处理方法经实验确定为5 mL硝酸和2 mL过氧化氢(30%,V:V)双溶剂消解,经微波消解仪消解,采用石墨炉原子吸收分光光度测定保健食品中铝元素的含量。结果铝元素在0~500μg/mL的浓度范围内线性关系良好,相关系数为0.998;铝元素的检出限为0.24 mg/kg;回收率为81.2%~98.7%;相对标准偏差小于3.2%(n=6)。结论该方法操作简单、灵敏度高、检出限低,满足保健食品中铝元素含量的测定。 相似文献
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目的评定全自动石墨加热消解-石墨炉原子吸收法测定麦苗粉中铅含量的不确定度。方法麦苗粉样品经全自动石墨加热消解后,石墨炉原子吸收法测定,外标法定量,根据建立的数据模型对每个不确定度分量进行评定,最终得出对合成不确定度的贡献度。结果置信概率为95%,取包含因子k=2,湿法消解-石墨炉原子吸收法测定麦苗粉中铅含量结果报告为X=(0.17±0.01)mg/kg。结论该方法测量铅不确定度的主要因素是曲线拟合的不确定度。 相似文献
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陈亮 《食品安全质量检测学报》2021,12(6):2219-2223
目的 建立快速消解-石墨炉原子吸收光谱法测定食品中砷含量的方法。方法 采用快速消解法消解3类食品,用石墨炉原子吸收光谱法测定砷的含量。结果 本实验测定砷的方法检出限和定量限分别为0.051 mg/kg和0.170 mg/kg。与微波消解-原子荧光法测定结果相比,两种方法测定大米和茶叶的绝对差值占算数平均值分别为7.2%、7.6%,两种方法测定奶粉中砷的结果均为0 mg/kg。快速消解-石墨炉原子吸收光谱法的回收率在83.1%~94.4%。结论 本实验建立的快速消解-原子吸收光谱法测定食品中砷的检测方法准确、可靠,适用于食品中砷含量的检测。 相似文献
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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. 相似文献
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Sophie Guillot Laurence Peytavi Sylvie Bureau Renaud Boulanger Jean-Paul Lepoutre Jean Crouzet Sabine Schorr-Galindo 《Food chemistry》2006
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. 相似文献
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Jesus Simal-Gandara Miguel Sarria-Vidal Arjen Koorevaar Rinus Rijk 《Food Additives & Contaminants》2000,17(8):703-711
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. 相似文献
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M. S. Garcí a-Falc n J. Simal-G ndara S. T. Carril-Gonz lez-Barros 《Food Additives & Contaminants》2000,17(12):957-964
A simple, rapid and inexpensive method has been developed for the determination of benzo[a 相似文献
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H. J. Van Den Top A. Boenke P. A. Burdaspal J. Bustos H. P. Van Egmond T. Legarda A. Mesego A. Mourino W. E. Paulsch C. Salgado 《Food Additives & Contaminants》2001,18(9):810-824
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. 相似文献
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《肉类研究》2014,(2)
<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 相似文献
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《印刷工业》2014,(11):95-95
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%. 相似文献
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《印刷工业》2014,(8):103-103
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 相似文献
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《印刷工业》2014,(12):102-103
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. 相似文献