凝固型莲藕汁发酵酸奶的生产工艺研究

为了制备具有保健功能的复配型莲藕汁发酵酸奶,本研究采取感官评价、质构测定等方法,对影响莲藕汁发酵酸奶的工艺参数进行了优化。结果表明,莲藕汁发酵酸奶的最佳配方组合是莲藕汁用量15%、蔗糖用量7%,稳定剂用量0.15%和接种量4%。在此组合条件下,最终制得口感细腻、风味较佳的产品,质量符合国家发酵乳安全标准。     

凝固型莲藕酸奶加工技术研究

本文以莲藕汁和鲜牛乳为主要原料,采用保加利亚乳杆菌和嗜热链球菌做发酵剂进行乳酸发酵,制成具有莲藕和酸奶特有双重营养与保健作用的复配型保健酸奶。重点研究了莲藕浆液的最佳浓度、莲藕浆液与鲜牛奶的最佳配比和发酵、后熟、贮藏期间酸奶质量参数的变化,并通过正交试验设计筛选出莲藕酸奶的最佳工艺参数及配方。试验结果表明:采用50%的藕浆液与牛乳按4:6的比例混合,添加8%的蔗糖,加入4%的乳酸菌发酵剂,经40℃发酵6h,可制得组织状态、色泽良好,既有酸乳固有的香味,又有莲藕特有风味的双重营养保健酸牛乳。     

莲藕风味酸乳饮料的研制

以新鲜莲藕汁和鲜牛奶为主要原料,采用保加利亚乳杆菌和嗜热链球菌（1∶1）发酵鲜牛奶的工艺,研制出一种风味独特兼具营养与保健作用的莲藕酸奶。通过L（934）正交试验优化了发酵工艺参数,即藕汁酶解时间为30min、蔗糖用量3%、莲藕水解液与牛奶配比为1∶5（w/w）、发酵时间10h;制成的莲藕酸奶香气浓郁,具有较高的营养和保健价值。     

巴河莲藕汁发酵酸奶的研究

以藕汁和鲜牛乳为主要原料,配以蔗糖、稳定剂等,研制出一种具有营养和保健双重功能的藕汁型酸奶。通过正交试验确定最佳配方。结果表明:藕汁添加量5%,蔗糖用量6%,接种量4%,发酵时间4h,可制成质量优良的藕汁型酸奶。     

山药保健酸奶的研制

以奶粉和山药为原料研制保健酸奶.通过单因素和正交试验,得出山药保健酸奶的优化条件:山药汁的添加量为10％,加糖量8％,接种量1.5％,发酵时间为6h.     

苦剂茶茶汁酸奶的研制

研究以大别山特产植物苦剂茶汁和鲜牛奶为原料的保健酸奶的工艺.探讨苦剂茶汁对乳酸菌发酵作用的影响,以及糖量对苦剂茶苦味的的改善,结果表明,当茶汁量为10%～30%、发酵时间为4 h时,酸奶质量为最佳;利用L9(33)正交设计实验确定苦剂茶汁酸奶最佳配方是:糖用量为10%、茶汁量为10%、发酵温度40 ℃、发酵时间为5 h.     

搅拌型龙眼酸奶的研制

以龙眼汁和奶粉为主要原料研制一种复合型发酵酸奶。从产品感官质量和稳定性入手,应用正交实验法,确定了合理的配方和适宜的发酵工艺条件。结果表明,龙眼酸奶的主要原料最佳配比为奶粉与水质量之比为1∶8,龙眼汁添加量7.5%,复合稳定剂为淀粉0.10% 果胶0.025% CMC0.05%,最佳的发酵工艺条件为接种量5%,发酵温度为42℃,发酵时间为2.5h,将得到保健功效的搅拌型龙眼酸奶。     

银杏保健酸奶的研制

研究了以银杏果和鲜牛奶为原料的保健酸奶的制作。从酸乳发酵菌种的选择,食品添加物对酸奶发酵速度的影响,各种食品添加物添加量的确定,银杏酸奶配方的确定等5个方面研究了银杏酸奶的制作条件。结果表明,在银杏汁添加量为6%,低聚糖添加量为5%,稳定剂添加量为0.2%(均为质量分数),酸度为70°T时,所得产品的品质最佳。     

桑葚功能性酸奶的研究

由桑葚和牛奶为主原料,研制出了集桑葚和酸奶的保健功能于一体的新型保健饮料一桑葚功能性酸奶.采用正交实验筛选出最优组合,结果表明:桑葚汁6%,接种量为5%,加糖量为4%,发酵时间3.5 h为最佳的工艺条件,得到的酸奶的品质最好.     

金银花凝固型酸奶制作工艺研究

为充分发挥金银花的保健功效,以金银花汁与全脂乳粉为主要原料,研究了金银花凝固型酸奶制作工艺。试验结果表明:金银花汁浸提条件为:95℃,40 min;金银花凝固型酸奶最佳工艺参数:金银花汁添加量8%,白砂糖添加量9%,发酵剂接种量5%,发酵时间4 h。     

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.