香蕉酸牛乳发酵工艺的研究

将香蕉泥与牛奶调配接种乳酸菌发酵制成凝固型香蕉酸牛乳。研究不同工艺、不同稳定剂及配方的优化对香蕉酸牛乳成品品质的影响,确定香蕉酸牛乳的最佳发酵工艺。结果表明:质量分数为10%的奶粉与质量分数为7%的蔗糖混合,加入质量分数为10%的香蕉果泥、0.05%的KMC与0.05%的明胶混合稳定剂,加热杀菌、冷却后接入质量分数为3%的菌种,在42℃下发酵3h,4～5℃下冷藏12～20h,所得产品凝乳结实、口感细腻、酸甜适口、香蕉味和酸乳味协调、风味独特。     

带皮香蕉酿制香蕉果酒的研究

对带皮香芽蕉酿造果酒的工艺进行初步探讨,结果表明：成熟度5级的香蕉单宁含量较低、总糖含量较高,从收得率和果酒风味的角度考虑适合酿造果酒;全果香蕉果浆酶解试验表明酶解时间2.5 h、酶解温度50℃、果胶酶X和纤维素酶用量分别为110 mg/L和600 mg/L时香蕉汁收得率最高,可达68.23%,较同条件下果肉酶解的香蕉汁收得率高2.62%;全果香蕉发酵试验表明酵母接种量0.023%,初始糖度21 g/100 mL,发酵温度23℃时所酿果酒的风味最佳,感官品评得分高达85.6分。     

山楂红枣酸乳的研制及其抗氧化性

以新鲜山楂、红枣汁和脱脂乳粉为原料制作酸乳。以产品的感官质量变化为指标,采用正交实验法与模糊综合评判法确定了山楂红枣酸乳的最佳配方和工艺条件为:100 mL脱脂乳添加山楂浆9 mL、红枣汁12 mL、白砂糖5 g;接种发酵剂4 mL,发酵温度40℃,发酵时间8 h。该条件下生产的山楂红枣酸乳酸甜适口,质地细腻,黄酮含量达(4.62±0.533)mg/m L。对DPPH自由基的清除率随酸乳浓度的增加而增强,25 mg/mL时达78.35%,高于市售某品牌红枣酸乳。     

松针富硒抗氧化酸乳的加工工艺研究

以松针提取液、富硒酵母、全脂乳粉为原料,研制出既富硒又具有抗氧化能力的功能性酸乳。通过单因素试验法、正交试验法、感官评定,确定松针富硒抗氧化酸乳的最佳工艺和配方。松针富硒抗氧化酸乳的最佳配方:以松针提取液为溶剂,全脂乳粉质量分数14%,白砂糖质量分数15%,富硒酵母质量分数0.075%,稳定剂明胶质量分数0.1%。松针富硒抗氧化酸乳最优发酵工艺:发酵剂添加质量分数0.14%,发酵时间9 h,发酵温度45℃。松针富硒抗氧化酸乳的硒含量为0.31 mg/kg,总抗氧化能力为22.57 U/m L。此工艺条件下制得的松针富硒抗氧化酸乳酸甜可口,口感细腻,具有松针清新香味,且符合富硒产品的要求。     

香蕉酸牛乳发酵工艺

将香蕉泥与牛奶调配接种乳酸菌发酵制成香蕉酸牛乳,研究不同工艺、不同稳定剂及配方的优化对香蕉酸牛乳成品品质的影响。确定香蕉牛乳的最佳发酵工艺：发酵剂4%、全脂乳4%、蔗糖6%、香蕉经微波处理30s、果肉10%、加入0.5% 柠檬酸和VC(2:1)、0.1% 明胶和0.1%CMC,在95℃水浴条件下杀菌5min,43℃温度条件下发酵5h,此条件下所得香蕉酸牛乳营养风味独特,感官评价最优。     

葛根酸乳加工工艺优化

以湘西葛根、脱脂乳粉为主要原料,添加果葡糖浆、黄原胶、羧甲基纤维素钠加工成葛根酸乳,并对加工过程中的关键工艺进行研究。结果表明：用质量分数0.1% 柠檬酸＋ 0.1% VC 复合护色剂,葛根汁色泽呈乳白色,质量良好;产品最佳配方：脱脂乳粉与水按1:8(m/V)的比例制得复原乳,葛根汁:复原乳体积比为2:5,以复原乳质量为基准,添加质量分数10% 果葡糖浆、质量分数0.05% 黄原胶、质量分数0.1% 羧甲基纤维素钠,灭菌温度95℃,保温10min,保加利亚乳杆菌和嗜热链球菌(1:1)接入量3%(V/V),于发酵温度43℃条件下发酵5h。在该最优工艺条件下制得的葛根酸乳产品酸甜适口,营养丰富,风味浓郁。     

香蕉橙混合果汁酸乳饮料的研制

研究了以香蕉和橙为原料制备酸乳饮料的工艺条件.试验表明:柠檬酸和Vc以2:l的质量比对香蕉进行护色,效果最佳.制备该饮料的最优工艺条件为:混合果汁的香蕉汁和橙汁的质量比为2/3,混合果汁添加量30%,奶粉添加量12%,蔗糖添加量6%,接种量8%,发酵时间4h,发酵温度42℃,得到一种营养丰富、酸甜适口,具有浓郁的香蕉、橙的香味,稳定性较好的混合汁酸乳饮料.成品在O～4℃下保质期为7d.     

富硒绿豆酸乳的研制

以富硒绿豆和全脂乳粉为主要原料制备富硒绿豆酸乳,研究富硒绿豆与水的比例、富硒绿豆浆与乳粉的比例、接种量、发酵时间等条件,对富硒绿豆酸乳品质的影响.结果表明,按1 kg富硒绿豆加7 kg水的比例混合,经打浆、过胶体磨制得富硒绿豆匀浆,富硒绿豆匀浆经高温淀粉酶酶解、过滤后,再按照10%的比例加入全脂乳粉,调配成的绿豆乳按300mg/L的接种量接入菌种,然后在42℃下发酵6h,4℃后熟24 h,制得的富硒绿豆酸乳品质最好.检测结果表明,产品的粗蛋白、脂肪及非脂乳固体含量分别为2.53%、2.01%及7.17%,硒含量为172μg/ks.     

香蕉果酒酿造工艺研究

以香蕉为主要原料,研究采用控温发酵技术酿制香蕉果酒的工艺流程,通过对比试验确定最佳工艺参数为:果胶酶用量100mg/L,SO2添加量50～100mg/L,发酵温度24℃,精度22%,酵母接种量6%.     

香蕉酸乳的开发研究

对香蕉酸乳的制作工艺进行了研究,将香蕉护色打浆后与复原乳调配,按1∶1混合接种嗜热链球菌和保加利亚乳杆菌发酵,通过L9(34)正交实验得出最佳配料组合,并对其稳定性进行改良,从而研制出凝乳均匀、酸甜适当、口感细腻爽口,具有香蕉酸乳味协调的乳酸菌发酵酸乳。      

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