ZnO辅助催化植物油热聚合制备大豆油基油墨连结料

以大豆油为原料,蒽醌为催化剂,ZnO作为辅助催化剂进行大豆油基连结料的制备,研究了ZnO对大豆聚合油黏度、酸值和相对分子质量等的影响,并分析了不同ZnO用量对大豆油基油墨连结料以及印刷油墨性能的影响.结果表明,ZnO作为辅助催化剂制备的聚合油能够适合油墨的生产,并赋予油墨良好的性能.     

天然香茅纳米胶囊的制备

通过界面聚合法，采用SDS和Span作为乳化剂，利用单体IPDI与催化剂四甲基乙二胺反应聚合形成壁材，包覆香茅醛与辛葵酸甘油酯，制备天然香茅纳米胶囊。通过改进芯壁比、香茅油与油相乳化剂的比例、超声温度与时间、聚合反应温度与时间、催化剂用量和添加方式、致孔剂用量、乳化剂用量等对制备工艺进行优化，得到制备香茅醛纳米胶囊的优化聚合工艺。     

大豆低聚糖对大米粉老化性质的影响及其机理研究

为了更好的在大米粉中使用功能性低聚糖(大豆低聚糖),本实验研究了大豆低聚糖对大米粉老化性质的影响,并研究其作用机理。添加大豆低聚糖可以改善大米凝胶的质构特性。碘结合实验表明大豆低聚糖可以降低大米凝胶的结晶度,延缓凝胶老化。而傅里叶红外光谱证明了大豆低聚糖延缓大米凝胶老化是通过与淀粉链形成分子间氢键从而阻止淀粉链的相互靠近、降低结晶度。因此,大豆低聚糖可用于抑制大米类食品的老化、延长货架期。     

大豆卵磷脂氢化催化剂的筛选

本实验通过考察Ni、二元金属Cu-Si、SRNA-2型非晶态、Pd/C四种催化剂对大豆卵磷脂氢化的影响,筛选出Pd/C作为大豆卵磷脂氢化的催化剂。选择氢化条件为:温度60℃,催化剂添加量5%,压力1.5MPa,时间3h,获得了碘值为25.4gI2/100g的淡黄色氢化大豆卵磷脂。     

野生香薷籽油脂肪酸组成及氧化稳定性研究

采用气相色谱对野生香薷籽油的脂肪酸组成进行分析测定,通过Rancimat氧化稳定性测定仪测定香薷籽油氧化稳定性,并分析比较不同抗氧化剂对香薷籽油的抗氧化效果。结果表明:香薷籽油中不饱和脂肪酸含量超过90%,其中亚麻酸含量达到58.65%;诱导期的对数与温度之间呈线性相关,香薷籽油在20℃时货架期为52.8 d,在抗氧化剂添加量相同的情况下,TBHQ的抗氧化效果最好;柠檬酸具有很好的增效作用,添加0.02%TBHQ+0.01%柠檬酸作为香薷籽油的抗氧化剂,在20℃时货架期为334.9 d,货架期延长282.1 d,抗氧化效果显著。     

酶法催化甘油解制备亚麻籽油甘油二酯及其氧化稳定性分析

甘油二酯（diacylglycerol,DAG）具有防止动脉硬化,抑制脂肪堆积的作用,是一种重要的功能性油脂。为提高亚麻籽油DAG产量,探究亚麻籽油DAG氧化稳定性,以甘油和亚麻籽油为原料,Lipozyme CALB脂肪酶为催化剂,在无溶剂体系中通过酶法催化甘油解反应制备DAG。通过单因素实验探究了底物物质的量比、反应温度、反应时间、初始水分添加量和酶添加量对产物中DAG质量分数的影响。并对分子蒸馏精制亚麻籽油DAG的氧化稳定性进行研究。结果表明,在甘油与亚麻籽油物质的量比为20∶1,反应时间10 h,反应温度80℃,初始加水量（质量分数）为0,加酶量2.0%（质量分数,以底物质量计）的条件下,DAG质量分数可达到47.13%,分子蒸馏后质量分数达到57.18%。通过添加TBHQ(0.20 g/L)作为抗氧化剂,亚麻籽油DAG氧化稳定性得到显著提升,理论货架期由37 d延长至109 d。     

2种酚类抗氧化剂对牡丹籽油氧化稳定性影响研究

通过Schaal烘箱实验,以过氧化值(PV)、茴香胺值(ρ-AnV)、全氧化值及脂肪酸组成为指标研究2种天然酚类抗氧化剂咖啡酸和阿魏酸及合成抗氧化剂TBHQ对牡丹籽油氧化稳定性影响,并建立牡丹籽油氧化动力学模型,以Rancimat法预测其货架期。研究表明:0.02%咖啡酸和0.02%阿魏酸对牡丹籽油都有一定的抗氧化效果,与不添加抗氧化剂相比货架期延长2.65、2.55倍,但较TBHQ仍有提升空间,几种抗氧化剂能力大小为TBHQ咖啡酸阿魏酸。咖啡酸、阿魏酸能够有效延缓牡丹籽油中α-亚麻酸等不饱和脂肪酸分解,提高牡丹籽油氧化稳定性和产品质量,能够作为高效、安全的天然抗氧化剂应用于油脂工业。     

水溶性大豆多糖对淀粉老化特性的影响

豆渣中含有丰富的纤维素,从中可以提取出水溶性大豆多糖,该多糖特性优良.对该多糖进一步改性修饰之后,将其与淀粉作用,通过DSC实验发现:水溶性大豆多糖能显著降低老化淀粉的吸热焓,有效延缓淀粉的老化作用.水溶性大豆多糖的这种延缓淀粉老化的作用,可以延长食品货架期,对食品加工业有着重要意义.     

酸催化地沟油与醇类酯化反应研究

以酸作为催化剂对地沟油与甲醇、乙醇酯化反应进行正交实验,实验中酸催化地沟油最佳反应条件,对于甲醇:温度为70℃,油醇摩尔比为1:40,催化剂浓度为7%,反应时间为6h,级差顺序依次是:油醇摩尔比、反应时间、催化剂浓度、温度;对于乙醇:温度为80℃,油醇摩尔比为1:30,催化剂浓度为5%,反应时间为6h,级差顺序依次是:油醇摩尔比、温度、催化剂浓度、反应时间。     

植物油的酶催化脱胶过程分析

探讨了大豆毛油在脱胶过程中利用生物化学反应－酶作为催化剂水解磷脂分子。研究表明：酶可在比较温和的条件下将毛油中的非水合磷脂转变成水合磷脂，然后再经离心分离去除胶质得到高质量脱胶油，同时也将油中的其他杂质，如重金属Ｆｅ，Ｃａ等降低至理想范围内。     

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.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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