果胶酶提高番茄出汁率的工艺研究

通过单因素和正交试验确定果胶酶提高番茄出汁率的最佳工艺条件,结果表明,果胶酶的添加量为0．18％,酶解时间为90min,酶解温度为50℃时番茄的出汁率最高,为75．5％,与未经果胶酶处理的番茄相比,出汁率可以提高19．7％。     

功能性番茄饮料工艺研究

以番茄为原料进行饮料的加工,针对提高番茄出汁率、饮料稳定性、饮料色泽的保持工艺研究实验,结果发现,对番茄预热后,再加果胶酶处理、加压过滤工艺可使番茄的出汁率达到81.5%,提高了番茄的利用率;番茄饮料中添加2‰,质量比5:2:3的羧甲基纤维素钠、黄原胶、琼脂复配增稠剂可使饮料在常温保存三个月仍具有良好的稳定性。通过实验研制出营养丰富、色泽鲜艳、风味自然、功能性强的番茄饮料。     

仙人掌多糖原汁提取工艺的研究

比较了酶榨法、热榨法、鲜榨法和冷榨法四种方法对仙人掌多糖原汁的提取效果，结果表明：鲜榨法出汁率最低，冷榨法其次，而酶榨法(酶浓度为0．05％)和热榨法(100℃蒸汽热烫5min)出汁率较高。而仙人掌多糖原汁中多糖的含量又以热榨法的方式含量最高，达到0．487％。考虑出汁率和多糖两个因素，采用热榨法和酶法结合的方式作为适宜的仙人掌多糖原汁的提取方式。通过正交试验得出了仙人掌多糖原汁提取工艺的最佳参数组合为热烫温度100℃，热烫时间3min，酶用量0．01％。在此最佳参数组合条件下，仙人掌出汁率为58．875％，多糖含量为0.495％。     

酶法提高青椒出汁率的研究

主要研究果胶酶、纤维素酶、半纤维素酶在提高青椒出汁率中的应用。结果表明，在单一酶试验中，果胶酶提高青椒出汁率效果最好，明显优于纤维素酶和半纤维素酶，纤维素酶次之，半纤维素酶相对较差。在复合酶试验中，果胶酶与纤维素酶按6：1复配，提高青椒出汁率效果最好。其在较佳酶解工艺条件：总酶用量0．0075％、加水量40％、酶解温度55℃、时间50min、pH3．0下，青椒出汁率可达74．4％，比单一果胶酶处理高出13．8％，比未经酶处理（23．4％）高出51％。     

酶法提高穗醋粟出汁率的研究

采用酶解法对穗醋粟取汁工艺进行了探讨。正交试验表明，酶作用时间、温度、酶的加入量依次为3h、45－55℃、0．038％－0．05％的组合效果最好，出汁率可达71％－73．8％。     

营养南瓜汁饮料的工艺研究

采用酶处理南瓜浆液，可降低其粘度，提高出汁率，维持该体系的稳定性；确定了南瓜汁饮料生产的工艺条件，用0．3％稀醋酸溶液热烫南瓜5min，Novo公司提供的果浆酶制剂对南瓜浆进行酶解，复合稳定剂(果胶：黄原胶=1：1)用量为1．6g／kg。     

高F值寡肽酸乳饮料的开发与功能评价研究

利用复合酶水解玉米蛋白粉制得的高F值寡肽（F值为21．7）进行酸乳饮料配方与功能特性研究。结果表明，饮料最佳工艺配方为：添加高F值寡肽3％，白砂糖8％，柠檬酸0．15％；试验组与对照组相比，高、中剂量组缺氧存活时间分别提高了48％（P〈0．01）和33％（P〈0．05）；游泳时间分别提高了64％（P〈0．01）和38％（P〈0．05），肝糖原含量分别为对照组的2．75倍（P〈0．001）和1.88倍（P〈0．01）；游泳前后小鼠血乳酸含量分别与对照组相比降低了63．5％（P〈0．01）和35．6％（P〈0．05），证明了玉米高F值寡肽酸乳饮料的抗缺氧和抗疲劳功能。     

提高番茄浓缩汁中番茄红素含量研究

以番茄为原料，采用多因素正交试验，优化番茄浓缩汁加工工艺条件。本文对番茄浓缩汁加工过程中，对影响番茄红素稳定性的浓缩终点可溶性固形物浓度、杀菌时间、防腐剂加量等因素进行了研究。结果表明，番茄榨汁时加入0．7％NaCl，出汁率最高(68％)；番茄汁浓缩的真空度为87～93kPa、温度50℃、浓缩至可溶性固形物含量23％、杀菌时间10min、防腐剂加量0.0％，在保藏1星期后，番茄红素的含量为97．20μg/100g，维生素C的含量为5．85mg／100g。影响浓缩汁中番茄红素含量的主要因素是浓缩终点的可溶性固形物浓度，其次是杀菌时间。     

豆乳饮料的稳定性及控制技术研究

对影响豆乳饮料稳定性的因素及其控制措施进行了研究。试验结果表明，复合乳化稳定剂的配方为：单甘酯0．15％，蔗糖酯0．10％，卡拉胶0．05％，CMC 0．05％；影响豆乳饮料风味的因素大小为：奶粉〉蔗糖〉香精，最佳的风殊配方为：奶粉2％，草莓香精2mL，蔗糖10％。     

番茄、胡萝卜乳酸菌发酵饮料的研制

开发研制新疆地产番茄、胡萝卜混合汁乳酸菌发酵饮料。方法：以优质番茄酱和胡萝卜浓缩汁为原料，用保加利亚乳杆菌和嗜热链球菌为菌种，采用四因素三水平正交实验，确定中间种子扩大液、发酵液及发酵饮料口感稳定性的最佳工艺配方。结果：用保加利亚乳杆菌和嗜热链球菌按1：1比例作为菌种；种子扩大液的最佳配方：番茄、胡萝卜混合汁配比3：7，2％葡萄糖，2％脱脂乳，3％接种量；发酵液最佳配方：番茄、胡萝卜混合汁配比3：7，发酵温度41℃，发酵时间24h，接种量3％；发酵饮料调配最佳配方；发酵原液中添加蔗糖5％，柠檬酸0．02％，耐酸羧甲基纤维素钠（CMC-Na）0．2％，黄原胶0．03％。     

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.