分子蒸馏法脱除油脂中塑化剂效果的研究

研究了利用分子蒸馏法脱除油脂中邻苯二甲酸酯类塑化剂(PAEC)的工艺条件和脱除效果。结果显示,在刮膜转速190 r/min,进料速率50滴/min、蒸馏温度200℃的分子蒸馏条件下,油脂中邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二异丁酯(DIBP)、邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二乙基己酯(DEHP)的脱除率分别达到46.5%、68.1%、96.0%、97.3%、71.5%,残留量分别为0.927、0.536、0.246、0.179、0.853 mg/kg。DBP、DEHP残留量达到并优于国标限量要求(≤0.3 mg/kg、≤1.5 mg/kg)。与水蒸汽蒸馏法脱除植物油脂中塑化剂相比,分子蒸馏法能在较低温度和很短时间条件下高效脱除油脂中的PAEs,尤其是对DBP和DEHP的脱除效果显著。     

GC-MS法测定白酒中DBP、DEHP、DINP含量的不确定度评定

邻苯二甲酸盐对人体健康有一定的威胁,因此食品及饮品中其含量有一定的限度,这类化合物性质类似植物油且有一定的挥发性,因此采取GC-MS法测定白酒中邻苯二甲酸二丁酯(DBP)、邻苯二甲酸(2-乙基己基)酯(DEHP)、邻苯二甲酸二异壬酯(DINP)等邻苯二甲酸盐的含量,并对对白酒中DBP,DEHP,DINP测量结果的不确定度进行了评定。结果表明,白酒样品中DBP,DEHP,DINP含量的合成不确定度和扩展不确定度分别为0.004 mg/kg,0.008 mg/kg,0.004 mg/kg和0.008 mg/kg,0.016 mg/kg,0.008 mg/kg。     

青岛市市北区居民主要邻苯二甲酸酯类物质膳食暴露水平及其风险评估

目的分析青岛市北区主要食品中邻苯二甲酸二(2-乙基己基)酯(DEHP)和邻苯二甲酸二丁酯(DBP)含量水平,计算本区居民膳食暴露水平并进行初步风险评估。方法全区采集7类样品共281份,采用气相色谱-质谱法测定食品中DEHP和DBP的含量。利用食品中DEHP和DBP的平均含量,同时结合居民平均食物消费量,计算7类食品的DEHP和DBP的膳食暴露水平,并分别与DEHP和DBP的每日可耐受摄入量(tolerable daily intake,TDI)比较,初步评估市北区居民主要食品中DEHP和DBP的暴露风险。结果 7类食品中DEHP和DBP的含量范围分别为0.00~5.90和0.00~7.20 mg/kg BW。市北区居民经7类食品中DEHP和DBP暴露量分别为0.006 927和0.005 558mg/kg BW,均未超过相应的TDI。结论市北区居民经7类食品摄入DEHP和DBP的的健康风险较低。     

不同制作工艺对猪油理化与风味品质的影响

通过猪油品质对比分析优化猪油制备工艺。将猪肥膘和猪板油按2 个质量比（1∶4和2∶3）混合,考察加水量及炼制温度对猪油感官品质、酸价和过氧化值的影响;采用气相色谱-质谱联用和电子舌技术分析以最佳工艺制作的2 种猪油风味间的差别。结果表明：猪油的最佳制作工艺为加水量2%、炼制温度160 ℃、炼制时间15 min;2 种猪油中共鉴定出75 种风味化合物,包括酮类、醛类、酸类、醇类、酯类、烷烃和其他杂环化合物共7 类,2 个不同原料配比猪油样品中各风味物质的种类及含量存在差异,醛类化合物含量均较高,其次是酸类及醇类化合物;电子舌检测结果表明,2 种猪油挥发性风味差异显著,猪肥膘、猪板油质量比1∶4的样品滋味优于猪肥膘、猪板油质量比2∶3的样品。炼制原料、炼制工艺对猪油成品的感官、理化及风味品质有显著影响。     

奶茶杯内膜中增塑剂含量的检测分析

采用高效液相色谱法测定奶茶杯内膜材料中的邻苯二甲酸(2-乙基己基)酯(DEHP)、邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二辛脂(DOP)3种增塑剂向脂溶性模拟液(牛奶、植物油、异辛烷)中的迁移溶出量。结果表明,奶茶杯内膜材料经过脂溶性模拟液浸泡后有DEHP和DBP的检出,DOP未检出,DBP检出量在欧盟指令2007/19/EC的规定范围内,DEHP检出量远大于英国农渔食品部规定的的每日耐受量。     

烟台市居民经饮料和白酒摄入邻苯二甲酸二(2-乙基己基)酯和邻苯二甲酸二丁酯的风险评估

目的通过对烟台市居民饮料及白酒中邻苯二甲酸二丁酯(DBP)和邻苯二甲酸二(2-乙基己基)酯(DEHP)含量检测分析,计算烟台市居民膳食暴露风险并进行初步评价。方法在烟台市采集饮料和白酒样品共385份,采用气相色谱-质谱法测定饮料及白酒中DBP和DEHP的含量。利用饮料及白酒中DBP和DEHP的平均含量,结合居民平均食物消费量,计算烟台市居民经饮料和白酒摄入的DBP和DEHP水平,并分别与DBP和DEHP的每日可耐受摄入量(TDI)进行比较,初步评估烟台市居民经饮料及白酒摄入的DBP和DEHP的健康风险。结果饮料及白酒中DBP和DEHP含量范围分别为未检出(ND)~4.106和ND~3.285 mg/kg。烟台市居民饮料和白酒中DBP和DEHP暴露量分别为0.038和0.031μg/kg BW,远远低于健康指导值。结论烟台市居民经饮料及白酒摄入DBP和DEHP的健康风险较低。     

塑料食品接触材料中邻苯二甲酸酯的迁移研究

邻苯二甲酸酯类(PAEs)是塑料中常用的一类添加剂,对人体的免疫系统、生殖系统、神经系统都有一定的伤害。以塑料食品接触材料为研究对象,通过10%乙醇、4%乙酸、50%乙醇和异辛烷为食品模拟物研究邻苯二甲酸二异丁酯(DIBP)、邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二环己酯(DCHP)、邻苯二甲酸二(2-乙基)己酯(DEHP)迁移。结果表明:DBP是最容易迁移出的一种增塑剂,在四种模拟物中DBP迁出量大小依次为异辛烷50%乙醇4%乙酸10%乙醇。PAEs迁移量随着接触时间的延长和接触温度的升高而增加。     

温度对食品级PVC中4种增塑剂迁移量的影响

以食品包装材料聚氯乙烯(PVC)为研究对象,研究PVC中邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二异丁酯(DIBP)、邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二(2-乙基)己酯(DEHP)4种增塑剂在30℃～80℃条件下,水、乙酸、乙醇、正己烷4种模拟液中的迁移情况。结果表明,此4种增塑剂都在正己烷的环境下迁移量最大,并且在各种食品模拟液中的迁移量均随温度的升高而增大。     

食品塑料包装材料中邻苯二甲酸酯类物质的检测

采用固相萃取-气相色谱法测定9种不同食品塑料包装材料中的6种邻苯二甲酸酯[邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二丁酯(DBP)、邻苯二甲酸丁基苄基酯(BBP)、邻苯二甲酸二(2-乙基己基)酯(DEHP)、邻苯二甲酸二正辛酯(DNOP)]的含量。结果表明,回收率介于83.2%~106.9%区间,相对标准偏差(RSD)介于1.6%~6.2%区间。9种抽检的食品塑料包装材料中全部检出了邻苯二甲酸酯(PAEs),其中DBP存在于所有抽检样品中,且66.67%的样品中含有DEHP,检出的邻苯二甲酸酯类物质的含量均高于欧洲规定的每天0.3 mg/kg体重的标准。     

白酒中塑化剂GC-MS检测方法的研究

以邻苯二甲酸二丁酯（DBP）、邻苯二甲酸二（2-乙基）己酯（DEHP）、邻苯二甲酸二异壬酯（DINP）3种邻苯二甲酸酯类塑化剂为例,通过改进气相色谱-质谱法测定条件,研究得出适合白酒中塑化剂检测的方法。并采用不同包装的6个未知酒样进行方法应用测试,测试结果显示DBP含量高达2.03mg/kg,DEHP、DINP含量均在限量范围之内。     

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.