天然火棘色素的提取及稳定性的研究

对火棘色素的提取及其稳定性进行了研究,结果表明：火棘色素易溶于水、乙醇,不溶于丙酮、二氯甲烷等,适宜用酸性乙醇溶液提取;对热较稳定,但不耐60 ℃以上的温度;pH值对其影响较大,适宜在酸性条件下使用;金属离子、氧化剂、还原剂和糖对其有一定的影响.     

火棘色素的化学成份及性能研究

根据红外光谱、紫外光谱、质谱及纸层析等分析鉴定,得知火棘果的脂溶性色素主要化学成份为β-胡萝卜素、多顺式蕃茄红素及正二十九烷,水溶性色素主要为矢车菊-3-葡萄糖甙氯化物。并对水溶性色素的稳定性等进行了研究。首次阐述了火棘果的开发利用价值。     

紫苏色素稳定性的初步研究

本文研究了紫苏色素的热稳定性、光稳定性、pH值、金属离子和氧化还原剂对紫苏色素稳定性的影响．实验结果表明，紫苏色素对光、热都较稳定，在pH为3－4的范围内，紫苏色素降解缓慢，除Cu2 、Fe3 外，大多数金届离子对其影响很小，氧化还原剂对色素有破坏作用．     

野生火棘果汁饮料的研制

前言火棘（PyracantySP）又名红子、救军粮、火把果，属蔷薇科火棘属常绿野生灌木，全国分布区域较广。据中药资料记载，火棘果具有活血、消积止痢等功效。成熟的火棘果酸甜可口、香气浓郁、营养丰富，果实中含有Vc11mg／100g左右及糖、硫胺素、氨基酸、钙、钾、磷、天然大棘色素等物质，其中的天然火棘色素．颜色鲜亮，较耐热、耐光，不失为加工果汁饮料较为理想的野生原料。1．工艺流程火棘→采果→选果→清洗→破碎→浸提→酶解→榨汁→澄清→过滤→配制（白砂糖、柠檬酸）→脱气→灌装封口→杀菌→冷却→检验→成品消毒——空罐2操作…     

郑州市火棘果红色素的提取及理化特性研究

以郑州产火棘果为原料,经冲洗、干燥、粉碎后,用70%酸性乙醇浸提制得火棘红色素溶液,并对该色素的稳定性进行研究。旨在为郑州市区火棘资源的研究和功能性产品的开发提供依据。结果表明,该色素在酸性条件下对光、热、常用食品添加剂都比较稳定,是一种价廉易得、安全可靠、开发方便的天然植物色素。     

火棘果实中油、色素及果胶的联产工艺研究

对火棘果实中油、色素及果胶的提取提出了联产工艺研究，火棘种了、果肉中的油脂利用超临界二氧化碳萃取技术萃取，水溶性火棘红色素、果胶利用溶剂法提取。并对实验结果进行分析。     

β-环糊精与熊果酸在乙醇溶液中的包合效果研究

为了研究洋葱醇溶性色素的稳定性,本实验采用75%的乙醇浸提洋葱,研究了pH、温度、光照、氧化剂和还原剂、金属离子、食品添加剂和食品配料对洋葱色素稳定性的影响.实验结果表明:洋葱色素在酸性条件下较碱性条件下稳定;洋葱色素可以耐受较高温度;洋葱色素对日光和紫外线均不稳定;洋葱色素对氧化剂有较好的耐受力,还原剂中Na2SO3、抗坏血酸对该色素稳定性的影响不大,但FeSO4·7H2O对该色素的稳定性有明显的影响;洋葱色素对金属离子K+、Ca2+、Mg2+、Al3+表现出较好的稳定性,但Cu2+、Zn2+、Fe2+、Fe3+对该色素溶液稳定性的影响较大;洋葱色素对食品添加剂和食品配料较为稳定.     

洋葱醇溶性色素稳定性研究

为了研究洋葱醇溶性色素的稳定性,本实验采用75%的乙醇浸提洋葱,研究了pH、温度、光照、氧化剂和还原剂、金属离子、食品添加剂和食品配料对洋葱色素稳定性的影响.实验结果表明:洋葱色素在酸性条件下较碱性条件下稳定;洋葱色素可以耐受较高温度;洋葱色素对日光和紫外线均不稳定;洋葱色素对氧化剂有较好的耐受力,还原剂中Na2SO3、抗坏血酸对该色素稳定性的影响不大,但FeSO4·7H2O对该色素的稳定性有明显的影响;洋葱色素对金属离子K+、Ca2+、Mg2+、Al3+表现出较好的稳定性,但Cu2+、Zn2+、Fe2+、Fe3+对该色素溶液稳定性的影响较大;洋葱色素对食品添加剂和食品配料较为稳定.     

山茱萸果皮红色素稳定性的研究

本试验了pH，温度，光照，金属离子及食品中常用的几种食品添加剂对色素稳定性的影响，结果表明：该色素在酸性溶液中稳定，对热稳定，光照对色素具有降解作用，几种金属离子，蔗糖，β-CD及低浓度的苯甲酸钠对色素无不良影响，柠檬酸具有增色作用，抗坏血酸对色素有不良影响，亚硫酸钠可使色素褪色，但色素能基本复原，色素对Fe^[3 ],H2O2较敏感。     

火棘色素与果胶综合提取工艺优化

对火棘色素和果胶的综合提取工艺条件进行研究。先采用乙醇浸提法提取火棘色素,后采用盐酸水解法提取火棘果胶,并分别采用L9(33)和L9(34)正交试验对色素和果胶提取工艺进行优化。结果表明：火棘色素的最佳提取工艺为提取温度90℃、提取时间2h、料液比1:20(m/V),此条件下火棘色素粗提物的提取率为25.31%;用盐酸水解已提取色素的火棘渣提取火棘果胶,最优工艺条件为提取温度90℃、提取时间2.5h、pH1.5、料液比1:25(m/V),此条件下的火棘果胶提取率为4.72%。该工艺设备投入低、工艺简单、适合大规模生产。     

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.