酶法提取葡萄皮渣中白藜芦醇工艺研究

本实验研究了酶法提取葡萄皮渣中白藜芦醇工艺。对影响酶法提取的酶解温度、酶解时间、浸提温度、浸提时间和浸提次数五个因素进行考察,得出最佳提取工艺条件为:葡萄皮渣与纤维素酶的配比为1000:1,在60℃下酶解90min,酶解后加入乙酸乙酯,在30℃下浸提0.5h,浸提两次。在此条件下,白藜芦醇得率为0.93mg/g。     

酶法提取黑木耳多糖

研究了酶法提取黑木耳多糖的最佳工艺条件。以提取率为指标,分别考察了浸提剂倍数、酶解pH、温度、时间、加酶量对果胶酶或纤维素酶酶解反应的影响。试验确定了果胶酶酶解木耳的最佳工艺条件:浸提剂倍数50,pH5.0,温度55℃,时间80min,酶加量1.1%,在此条件下,黑木耳多糖的提取率为4.15%;纤维素酶酶解木耳的最佳工艺条件:浸提剂倍数50,pH5.0,温度50℃,时间80min,酶加量为1.3%,黑木耳多糖的提取率为4.71%。     

洋葱杜仲山葡萄酒的研制

以洋葱、杜仲、山葡萄酒为原料,经过浸提、调配、冷冻处理等工艺,采用了正交设计试验确定了洋葱杜仲山葡萄酒的最佳工艺条件和配方。结果表明:杜仲浸提液的最佳工艺条件:杜仲与乙醇比为1∶10,浸提温度60℃,浸提时间1.5h。洋葱杜仲山葡萄酒口味最佳配比,洋葱浸提液添加量10%,杜仲浸提液添加量2%,加糖量10%。洋葱杜仲山葡萄酒稳定性的最佳处理为果胶酶加量0.02g/100mL,酶解温度50℃,酶解时间1.5h。洋葱杜仲山葡萄酒最佳冷冻条件:冷冻温度-6℃,冷冻时间7d。     

太谷壶瓶枣酒生产工艺的研究

以山西太谷壶瓶枣为原料,通过单因素和正交试验,研究了红枣汁浸提以及红枣酒发酵的最佳方式及工艺参数。结果表明,热水浸提(加水量4倍,浸提温度90℃,浸提时间100 min)与果胶酶酶解浸提(果胶酶添加量0.1%,酶解温度50℃,酶解时间3 h)结合浸提效果最佳;红枣酒发酵的最佳工艺条件为:发酵温度20℃,酵母接种量0.4%,发酵时间7 d。     

酶法提取怀菊花总黄酮工艺研究

用正交实验确定酶法提取怀菊花总黄酮的最佳提取工艺条件为:料液比为1∶ 10,酶解温度45 ℃,pH=6.2,纤维素酶用量0.25 g/L,果胶酶用量0.3 g/L,酶解时间150 min,浸提时间60 min,浸提液体积40 mL.在此条件下怀菊花总黄酮的得率可达6.83%.     

双酶法提取赤霞珠酿酒葡萄皮渣白藜芦醇工艺优化及抗氧化性研究

以赤霞珠酿酒葡萄皮渣为原料,研究双酶法（纤维素酶和果胶酶）辅助浸提白藜芦醇工艺的最佳条件及其体外抗氧化活性。通过单因素试验及正交试验考察纤维素酶添加量、果胶酶添加量、酶解温度、酶解时间、液固比对白藜芦醇浸提工艺的影响。结果表明,最佳白藜芦醇浸提工艺为纤维素酶和果胶酶添加量分别为2.5%和1.2%,酶解温度为45 ℃,酶解时间为100 min,液固比为30∶1（mL∶g）。在此优化条件下,白藜芦醇得率为927 μg/g干质量。体外抗氧化试验结果可知,在质量浓度0.1～0.5 mg/mL的范围内,白藜芦醇对DPPH·和·OH的清除作用较好,最大清除率分别达到83.1%和74.0%。     

酶法提取长枣红色素的研究

研究了酶解-醇提从长枣中提取长枣色素的工艺过程及工艺条件,通过单因素和正交试验得到的最佳工艺参数:料水比为1∶20,粉碎度60目,酶加量为1%,酶解温度50 ℃,酶解时间40 min,酶解pH 6,乙醇浸提的体积比为1∶3,此条件下长枣色素的得率为9.85%.     

酶技术在红枣汁提取中的应用研究

以红枣为原料,采用果胶酶酶解浸提的方法制备红枣汁。主要研究了预煮工艺和酶解条件对红枣汁提取效果的影响。结果表明:最佳预煮条件为:预煮温度100℃,预煮时间20 min,料水比为1︰16;酶解浸提的最佳工艺条件为:果胶酶0.3%,酶解温度50℃,酶解时间3 h,酶解pH3。在此最佳工艺条件下做验证试验,枣汁提取率可达51.89%,总糖35.93%,可溶性固形物10.57%,所得枣汁色泽自然、枣香浓郁、具有较好的稳定性。     

水酶法提取葵花籽油的研究

采用水酶法提取葵花籽油并对其提取条件进行研究,以脱壳葵花籽为原料,采用复合纤维素酶提取葵花籽油,通过单因素实验及正交试验,研究了料液比、浸提温度、浸提时间、加酶量、酶解温度、酶解时间等因素对出油效率的影响,确定最佳提油工艺参数。结果表明最佳提取条件为料液比1∶10,浸提温度90℃,浸提时间9 h,复合纤维素酶添加量0.10 g,酶解温度50℃,酶解时间1 h,出油效率可达到79.07%。     

新鲜菊苣提取和纯化菊粉的工艺

研究比色法测定菊粉含量的方法,并采用正交设计优选了从新鲜菊苣根中热水浸提菊粉的提取工艺条件和脱蛋白以及脱色的最佳条件。实验结果表明,菊粉提取的最佳工艺条件为:料液比1∶1,浸泡时间40 min,加热浸提温度为100℃,加热浸提时间40 min,菊粉的提取率达14.74%;脱蛋白时菊液与活性炭的最佳比例为1∶1.5;提取液最佳脱色工艺条件为:脱色温度70℃,脱色时间50 min,活性碳用量为30 g/L,脱色率为74.36%。     

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.