两种保鲜液对南国梨保鲜效果的比较

目的探究两种保鲜液对南国梨保鲜效果。方法测定南国梨样品的外观变化、失重率、酸度及总糖含量的变化。结果两种保鲜液均具有良好的保鲜效果。保鲜液2的保鲜效果更明显,用此保鲜液制成的保鲜纸包装样品,35 d后果品外观良好,失重率比对照组降低了1.76%,酸度减少了0.07%。说明这种保鲜液制成的保鲜纸能有效地减少水分散失、保持果品风味。结论两种保鲜液对南国梨均具有良好的保鲜效果,将对发酵型天然保鲜剂的系统研究奠定基础。     

食用菌保鲜技术的研究进展

食用菌质地脆嫩,采收后易出现腐败、褐变、品质变劣等现象,严重影响其食用价值,也给食用菌产业带来巨大损失,因此开展食用菌保鲜技术研究具有十分重要的意义。综述近年来食用菌保鲜技术的研究进展,包括低温保鲜、辐照保鲜、气调保鲜、涂膜保鲜以及栅栏技术等,并对食用菌保鲜技术的发展方向进行展望。     

两种保鲜液处理冷却猪肉后的微生物、理化以及生物胺含量的变化

在以往实验的基础上,将优选的两种天然生物保鲜液用于冷却猪肉的保鲜处理,进一步验证保鲜液对延长冷却猪肉的保鲜效果。结果显示,经过1#保鲜液处理的冷却猪肉,在冷藏过程中其微生物和理化指标变化非常缓慢;2#保鲜液和1#保鲜液相比效果较差,但与对照组相比效果达显著水平(α<0.05)。处理组和对照组在贮存第21d时的生物胺积累量均较低,除了亚精胺含量最高在17.75～21.33mg/kg范围外,其他生物胺含量均在0～4.36mg/kg范围内,大大低于对人体毒害剂量30mg/kg的限值。     

食用菌保鲜与加工技术研究进展

食用菌具有丰富的营养价值以及广泛的药理价值,其产品受到市场越来越多的关注。食用菌的保鲜与加工也在快速发展之中。本文对食用菌保鲜、加工的研究现状和发展进行概述,并进一步提出食用菌保鲜加工的研究方向。     

水解胶原/海藻酸钠/纳米粒子复合保鲜液用于水果涂膜保鲜的研究

目的:研究水解胶原、海藻酸钠、纳米氧化钛或纳米氧化硅复合保鲜液对枇杷与樱桃的涂膜保鲜效果;方法:用复合保鲜液对枇杷与樱桃进行涂膜处理,着重探讨贮藏过程中腐烂指数、呼吸强度、失水率、总酸及可溶性固形物含量的变化;结果:该复合保鲜液可减少枇杷的失水率,降低枇杷的呼吸强度与腐烂指数,纳米氧化硅粒子经六偏磷酸钠分散后制得的复合保鲜溶液,时枇杷的保鲜效果较为明显;复合保鲜溶液可在一定程度上降低樱桃呼吸强度与腐烂指数,纳米二氧化硅对樱桃的保鲜效果优于纳米二氧化钛;结论:纳米粒子在水果涂膜保鲜方面有一定应用前景.     

食用菌菌体自溶机制的研究进展

食用菌营养丰富,具有一定的药用价值,已成为我国重要的经济作物之一。但由于食用菌水分含量较高,菌体细嫩没有保护结构,采后代谢旺盛,使其不易保鲜且容易发生自溶现象。食用菌菌体自溶是引起其采后损失的主要原因,严重影响其食用品质和商品价值,是限制食用菌贮运保鲜的关键因素之一。因此有必要对食用菌自溶的相关物质、影响因子和可能的发生机制进行深入系统地研究,明确其参与的主要成分和发生机制,为进一步的调控研究和应用奠定基础。本文综述了食用菌在自溶过程中几丁质、葡聚糖、果胶等细胞壁物质的代谢、细胞膜脂氧化及超微结构的变化,探讨了食用菌的自溶机制,为其贮藏保鲜提供理论依据。     

壳聚糖保鲜剂涂膜对保鲜葡萄的效果研究

研究了壳聚糖保鲜剂涂膜保鲜葡萄。采用壳聚糖为成膜主剂,表面活性剂为助剂,测定了添加不同表面活性剂的壳聚糖溶液的吸光度和涂布效果。在此基础上,添加不同金属离子的壳聚糖复合保鲜液对葡萄进行了涂膜保鲜处理,并测定了葡萄在贮藏过程中失重率、褐变指数、VC含量和总酸度等生理指标的变化。结果表明：在1%的壳聚糖溶液中添加2%吐温-20、Ca2＋或Cu2＋对葡萄的保鲜效果较好,能有效降低葡萄的失重率,延缓葡萄中总酸度的变化。添加了Ca2＋和Cu2＋的壳聚糖保鲜液对葡萄有较明显的保鲜效果。     

天然保鲜液对真空包装冷却猪肉的保鲜效果

考察了经3种不同配方保鲜液处理后的真空包装冷却猪肉,在(4±1)℃的温度条件下贮存过程中的微生物指标、理化指标和感官指标变化,进而比较3种保鲜液的抑菌效果。试验结果表明:保鲜液A(茶多酚和壳聚糖各5g/L、香辛料浸提液25mL/L、蜂胶1g/L、nisin1.5g/L)是一种抑菌效果比较好的天然防腐剂;保鲜液B(丁香浸提液132.5mL/L、桂皮浸提液193.5mL/L、乳酸菌发酵液176.5mL/L、生姜汁91.6mL/L、大蒜汁61.5mL/L)在微生物指标上弱于保鲜液A,但色泽较好,也可以应用于实际生产;保鲜液C(乳酸菌发酵液)虽然能够抑制贮存初期假单胞菌属的生长,并在一定程度上抑制肠杆菌科菌的生长,但产品贮存末期腐胺的含量较高,因此不适合作为真空包装冷却猪肉的保鲜液使用。     

几种香辛料提取物对红提葡萄保鲜效果的影响

目的比较大蒜、八角和肉桂提取物处理对红提葡萄在贮藏过程中的烂果率、呼吸强度、失重率及葡萄糖等主要的风味品质的影响,确定保鲜效果较好的提取物保鲜液。方法用0.1%、0.5%和1.0%3种浓度的大蒜、八角及肉桂保鲜液对红提葡萄进行处理,在温度为2℃、湿度分别为50%、70%和90%环境下贮藏,根据烂果率变化确定适于经提取物保鲜液处理后红提葡萄的贮藏条件及保鲜液浓度。在优化条件下,研究红提葡萄的贮藏品质的变化。结果通过比较对照组和处理组发现,经3种不同浓度的大蒜(A-0.1%、A-0.5%、A-1.0%)、八角(H-0.1%、H-0.5%、H-1.0%)和肉桂(N-0.1%、N-0.5%、N-1.0%)提取物保鲜液处理后,90%湿度条件下各组的烂果率较低,而1.0%浓度的3种提取物保鲜液能更好地降低红提葡萄的烂果率。其中,A-1.0%组红提的呼吸强度较低,风味品质含量保持较好。在贮藏63 d时,该组葡萄糖、可滴定酸、失重率和硬度分别为10.17 g/100 g、1.34 g/100 g、0.26%和1009 g,保持在较优水平。结论大蒜提取物保鲜液能有效地延长贮藏时间,对红提葡萄的保鲜效果优于八角和肉桂提取物保鲜液。     

怀远石榴皮提取液对黄瓜保鲜效果的影响

探讨怀远石榴皮提取液对黄瓜保鲜效果的影响.分别将黄瓜放入石榴皮提取液、壳聚糖溶液及乳酸钙溶液中浸泡2min,以蒸馏水为对照,室温下进行保鲜实验,检测了不同时间段黄瓜的质量损失率、Vc和丙二醛(MDA)的含量变化以及瓜体的软化腐烂情况,并对这三种保鲜液的保鲜效果进行比较.结果显示,三种保鲜液均可在不同程度上降低黄瓜的质量损失和Vc的损失情况,减缓丙二醛(MDA)的增加量,抑制瓜体的软化腐烂.其中怀远石榴皮提取液的保鲜效果最好.     

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.