芦荟糯米保健醋的研制

以芦荟原汁、糯米、酿酒干酵母、醋酸菌为原料,通过单因素实验和正交试验,探索了芦荟糯米醋的发酵工艺。通过正交试验确定了最佳组合为酵母活化液接种量为1.0%(V/V)、糯米与芦荟汁混合比为3∶2(g/mL),加水量为芦荟糯米混合量的1.5倍,发酵温度为28℃。芦荟糯米醋的最佳醋酸发酵条件为发酵温度30℃、酒精度10%(V/V)、接种量4%(V/V)、发酵时间96 h,可获得6.48 g/100 mL芦荟糯米保健醋。酿制的芦荟糯米醋香味独特,品位纯正。     

芦荟营养保健豆腐的研制

以芦荟和大豆为原料研制了芦荟保健豆腐,其最佳工艺参数豆乳浓度1∶6,GDL添加量0.25%,豆乳芦荟汁比为6∶2。该产品呈淡绿色,具有一定的芦荟香和纯正的豆香味,并有保健和美容作用,发展前景十分广阔。     

芦荟山楂汁复合饮料的研制

以山楂、芦荟和白砂糖为主要原料,采用正交试验和感官评定确定了产品配方和加工工艺,最佳工艺参数为:山楂汁115mL、芦荟汁135mL、白砂糖9%。     

芦荟浸泡酒的工艺研究

以库拉索芦荟为原料,以浓香型的蒸馏白酒为基酒,对芦荟浸泡酒的工艺进行了研究。在单因素实验基础上,利用正交实验研究芦荟添加量、超声波萃取时间、陈酿时间对芦荟浸泡酒感官品质和芦荟多糖含量的影响以确定最佳工艺条件,并进行了后期调味实验。结果表明:芦荟添加量90 g/100 mL,超声波萃取时间10 min,陈酿时间15 d,甜菊糖苷添加量0.08 g/100 mL时,得到的芦荟浸泡酒品质最佳。     

芦荟酸奶的研制

研究了芦荟原汁的制取工艺,通过添加助滤剂和稳定剂可得到性质稳定达6个月的芦荟原汁,以制得的芦荟原汁为原料,研制保健型饮料（芦荟酸奶）。通过正交实验,得到芦荟酸奶的最佳制取工艺,结果表明,芦荟原汁的助滤剂为添加活性剂,以3000r/min离心地滤20min为最佳澄清效果,芦荟原汁的稳定剂以0.03g/mL,的Vc,0.03g/mL柠檬酸,0.02g/mL,Na2SO3均有较好的稳定效果,芦荟酸奶制作的最佳工艺条件为蔗糖8％,Na2SO3均养时间3h,培养温度44℃,接种量6mL.     

芦荟枸杞饮料的研制

对芦荟枸杞饮料生产工艺进行了研究 ,结果表明 :芦荟叶肉的最适固化工艺是将原料在浓度 1mg/mL乳酸钙溶液中浸泡 10h ,产品最适糖酸比为蛋白糖 0 .18mg/mL ,柠檬酸0 .12mg/mL ,蜂蜜 0 .15mg/mL ,较为适宜的复合护色液为含 0 .0 0 2mg/mLNa2 SO3和 0 .5mg/mLVc 的溶液 ,产品最适稳定剂配方为 0 .1mg/mL黄原胶、0 .1mg/mL海藻酸钠、0 .0 5mg/mL琼脂 ,最佳灭菌条件为 80℃、2 0min     

芦荟花生枸杞复合保健饮料的工艺研究

该文以芦荟、花生和枸杞为主要原料,对其复合饮料的工艺进行了研究.试验结果表明,芦荟花生枸杞复合保健饮料的最佳配方为芦荟汁添加量20mL,花生汁添加量60mL,枸杞汁添加量20mL、水添加量100mL、白砂糖添加量6％、柠檬酸添加量0.08％;将芦荟、花生和枸杞进行复配制成的复合型保健饮料口味独特、营养丰富,风味良好.     

凝固型芦荟酸奶的工艺研究

以奶粉、芦荟为主要原料,采用正交实验研制出凝固型芦荟酸奶生产的最佳工艺条件为:奶粉17g、芦荟汁7mL、白砂糖8%、接种量3%、发酵温度44℃、发酵时间3h。该产品口感柔和爽快、风味独特,是一种兼具营养保健与疗效作用的新型乳制品。     

响应面法优化芦荟总黄酮提取工艺及抗氧化能力研究

采用超声辅助乙醇提取芦荟中总黄酮，以总黄酮得率为指标，在单因素试验的基础上通过响应面法优化提取工艺，并评价不同产地芦荟的抗氧化能力。结果表明：最优提取工艺为乙醇体积分数60%、浸泡时间2 h、料液比1∶16(g/mL)、提取时间18 min,在此条件下芦荟总黄酮得率为4.99%。在相同质量浓度下，印尼芦荟对DPPH·、ABTS⁺·和·OH的清除率最高，当质量浓度为1.0 mg/mL时，依次为79.08%、99.82%、75.94%;各产地芦荟总黄酮抗氧化能力与其质量浓度呈正相关，且均具有较好的抗氧化能力。     

中华芦荟多糖醇提法工艺优化及体外抗氧化能力测定

通过单因素和正交试验优化闽南地区中华芦荟多糖醇提法工艺,并测定其体外抗氧化活性。结果表明,中华芦荟多糖提取率影响因素由大到小依次为:提取温度提取时间芦荟液与乙醇用量体积比;在芦荟液与乙醇用量体积比1:6、提取时间1.5 h、提取温度80℃的组合条件下,多糖得率最高,达0.35%。提取的中华芦荟多糖有较好的体外抗氧化活性,对DPPH自由基的清除能力呈明显的剂量效应,5.0 mg/mL的芦荟多糖对DPPH自由基清除率达27.49%;对铁氰化钾的还原能力也和多糖浓度正相关,5.0 mg/mL中华芦荟多糖溶液对应5.80μg/mL没食子酸的还原能力。     

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.     

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