药食两用食品中微量元素和重金属含量的测定

建立了微波消解电感耦合等离子体发射光谱法测定药食两用食品中微量元素的方法,并用该法分别测定了14种药食两用食品中Mn、Fe、Zn、Cu、Ni、Cr、Cd和Pb等元素的含量.结果表明,该方法的加标回收率在95.0%～104.0%之间,RSD≤4.35%.药食两用食品中Zn含量高于其它可食性花卉,Fe含量比普通叶菜类蔬菜更高.而其Cu/Zn比值较低,重金属含量普遍较低.此测定结果可为探讨药食两用食品的保健作用与微量元素含量的相关性提供科学数据.     

凯里市木姜子中微量元素的研究

旨在研究凯里木姜子调味品中微量元素的含量,为开发利用木姜子提供参考。采用FAAS法测定了凯里木姜子中的Fe,Zn,Cu,Mn,Co,Ni,Cd,Pb含量,结果表明:Fe,Zn,Cu,Mn,Co分别为260,34,17,210,1mg/kg,而重金属Ni,Cd,Pb未检出。分析认为凯里木姜子是一种营养元素含量较高的香料,可对其进行开发利用。     

微波消解-ICP-AES法同时测定7种天然调味品中的10种无机元素

采用微波消解、电感耦合等离子体-原子发射光谱法(ICP-AES)对7种市售天然调味品(香叶、小茴香、草果、花椒、八角、桂皮、胡椒)试样中的10种无机元素Ca,Mg,Fe,Zn,Mn,Cu,Cr,Al,Ni,Pb同时测定。结果表明:7种天然调味样品中富含Ca,Mg,Fe,Zn,Mn,Cu等对人体有益的无机元素,Cr,Al,Ni,Pb等对人体相对有害的元素含量较低,同一元素在不同试样中存在一定的差异性。方法的加标回收率在95.6%~105.7%之间,相对标准偏差RSD(n=5)≤3.06%,该方法简单、快速、准确。研究结果为进一步研究天然调味品提供参考依据。     

火焰原子吸收光谱法测定海螵蛸中15种微量元素含量

用火焰原子吸收光谱法测定海螵蛸中微量元素(Ca、Mg、K、Cu、Zn、Mn、Cr、Co、Ni、Fe、Si、Al、Pb、As和Cd)的含量,并对结果进行分析比较。该方法的加标回收率为96.5%～108.7%,RSD小于2.8%,具有良好的准确度和精密度。人体必需的重要微量元素Zn、Fe、Mn、Cu含量均较高。另外,样品中还检出微量有毒元素铅、砷和镉。     

绿茶饮料中微量元素含量的测定分析

采用等离子体发射光谱法测定了3种品牌30批次绿茶饮料中K、Ca、Mg、Fe、Mn、Cu和Zn等7种微量元素的含量,方法的加标回收率在92.5%~105.0%之间,相对标准偏差RSD≤4.35%,结果表明,绿茶中微量元素K、Ca、Mg和Mn含量丰富,而Fe、Cu和Zn的含量相对较低;绿茶和其它饮品可乐、雪碧、矿泉水相比较,绿茶中K、Mg和Fe含量较高。数理统计分析结果表明,不同批次3种品牌的绿茶中K、Mg、Mn、和Zn的含量没有显著性差别,K、Mg、Mn、和Zn的含量可以作为判断绿茶品质的重要指标。     

微波消解-FAAS法测定鱼酱酸中八种微量元素

采用微波消解火焰原子吸收光谱法测定苗族、侗族同胞传统制作的原生态发酵型调味品鱼酱酸中的Fe,Zn,Cu,Mn,Cd,Ni,Cr,Pb含量,为原生态民族风情旅游地区黔东南发酵型调味品鱼酱酸的开发利用提供参考.     

鱼蓼中微量元素的研究

研究鱼蓼中的微量元素含量,为开发利用鱼蓼提供重要参考。采用火焰原子吸收光谱法分析了鱼蓼中的Fe,Zn,Cu,Mn,Co,Cd,Pb含量。结果表明:鱼蓼中的Fe,Zn,Cu,Mn,Co含量分别为543.08,183.01,15.91,145.22,5.97mg/kg,而重金属元素Cd,Pb未检出。分析认为,黔东南州榕江县原生态鱼蓼是一种富含营养元素的香料,可对其进行开发利用。     

云南金平小米辣微量元素含量分析

用原子吸收光谱法测定云南省金平县猛拉、营盘、马鞍底、地西北和勐桥5个地方的小米辣中Fe、Zn、Cu、Co、Cr、Ni等微量元素的含量,方法的相关系数在0.9986～1.0000之间,相对标准偏差在0.43%～1.86%之间,回收率在97.20%～107.15%之间,分析结果满意。结果表明:Fe是马鞍底小米辣最高,Zn、Cu、Co是地西北小米辣最高,Cr、Ni是猛拉小米辣最高。Fe在测定的元素中含量最高,平均含量为38.60mg/kg,其次是Zn,平均含量为13.35mg/kg,Cu平均含量为11.46mg/kg,Co、Cr、Ni含量相对较低,其含量顺序为Fe>Zn>Cu>Ni>Cr>Co。小米辣不仅可以调味,还可以补充人体必需的微量元素Fe、Zn、Cu、Co、Cr、Ni等。     

原子吸收光谱法测定敞口山楂中微量元素

用干法灰化处理样品,火焰原子吸收光谱法测定山楂中9种微量元素Fe、Cu、Ca、Zn、Mn、Mg、Se、Cr和Pb的含量。结果表明:除Cr、Pb和Cu未检出外,山楂中6种微量元素Fe、Ca、Zn、Mn、Mg和Se的含量分别为31.70,1 359.58,5.07,8.01,165.91和32.51μg/g。在试验浓度范围内,各元素的线性关系良好,加标回收率(n=3)在96.64%~103.83%之间,检出限在0.004 4~0.039μg/m L之间,相对标准偏差(n=6)在0.35%~3.10%之间。该方法操作简单,具有良好的精密度和准确度,适于山楂中微量元素的含量测定。     

山东植烟土壤与烤烟微量元素分布特点及相关分析

为摸清山东烟区土壤-烤烟系统中微量元素的分布特点,采用野外调查及室内化验分析相结合的方法,研究了土壤与烤烟中Fe、Mn、Cu、Zn的交互关系。结果表明,山东烟区土壤有效Fe、Mn丰富,有效Cu适中,有效Zn较低。山东烟区烤烟Fe、Mn含量较高,Cu、Zn含量适中。逐步回归与偏相关分析结果显示,烟叶中的微量元素都与土壤中对应的微量元素有效态含量具有显著或极显著的正相关关系,微量元素之间表现出一定的协同或拮抗关系。本试验结果表明,山东烟区土壤中应适当补充Cu、Zn两种微量元素,特别是质地较粗的土壤中这2种元素缺乏较严重。     

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.