风味蕨菜罐头的研制

以鲜嫩的蕨菜为原料,探讨蕨菜护绿最佳工艺条件及其风味蕨菜罐头生产的可行性。结果表明:蕨菜的最佳护绿工艺条件为温度95℃、漂烫时间3min、pH值4、Cu(COOH)2护绿液的浓度250mg/kg,所得到的蕨菜护绿效果最好;利用0.2%的CaCl2溶液作为蕨菜的保脆溶液能够达到比较好的保脆效果;以泡椒型和酸辣型蕨菜罐头的风味为最好。     

软罐头青椒护绿保脆工艺的研究

采用正交实验方法对软罐头装青椒的护绿保脆工艺条件进行了系统的研究。实验结果表明,用Cu2+浓度为250mg/kg,pH为7.0或Zn2+浓度为350mg/kg,pH为8.0的溶液浸泡22h,护绿效果最佳;以0.4%海藻酸钠浸泡后再用0.4%CaCl2浸泡,保脆效果最好;杀菌的最佳条件为:汤汁pH4.4～4.5,100℃,15min。产品经检测,铜含量符合国家有关标准。     

软包装即食蕨菜加工工艺的研究

蕨菜具有食用、营养和保健功能,具有很高的开发价值,把蕨菜做成软包装即食食品具有重要的经济和社会意义。研究以新鲜蕨菜为原料,利用全因子设计、正交设计,确定风味蕨菜的工艺流程和保脆及护绿的工艺参数。结果显示:乙酸锌作为护绿剂,最佳工艺参数为乙酸锌的浓度400mg/kg,pH值为3,护绿时间为40min,温度为70℃;氯化钙为保脆剂,最佳添加量为0.2%,保脆时间为40min。成品色泽黄绿、汤汁清澈透明,具有风味蕨菜特有的清香味,无异味,口感脆嫩。     

超高压灭菌莴笋软罐头预处理工艺研究

研究超高压莴笋软罐头的热烫灭酶、护绿和保脆等预处理工艺.采用分光光度计法测定过氧化物酶酶活,色差仪检测莴笋色泽,质构仪检测莴笋脆度,国标方法测定铜离子残留量,并通过正交实验优化工艺参数.在500MPa下超高压处理莴笋软罐头15min.结果表明,在100℃下热烫2min后,过氧化物酶酶活不再有显著变化,采用0.02%乙酸铜溶液护绿.0.3%海藻酸钠溶液和0.2%氯化钙溶液复合保脆,莴笋片色泽和脆度最好,铜残留量为3.66mg/kg.可见,通过热烫、护绿和保脆实验的研究,所得工艺条件可以有效地改善超高压果蔬软罐头的感官品质,产品中铜残留量符合国家限量卫生标准.     

即食调味海带结生产工艺研究

探讨了以干海带为原料,通过打结、脆化、护绿、脱腥、调味、杀菌等加工工序,生产即食调味海带结的方法,并对其生产过程中关键工艺技术进行研究,得出即食调味海带结生产的最佳工艺条件。护绿最佳条件:乙酸铜溶液浓度为15mg/kg、pH4.5、温度为100℃、时间为10min;在60℃下,海带结泡于0.2%醋酸与0.6%柠檬酸混合液中15min,脱腥效果好;以0.08?Cl2溶液脆化处理15min 口感脆嫩。     

椿芽保鲜工艺研究

通过实验,对椿芽的护绿、保脆、保藏液汁液配比和杀菌条件探讨研究。结果表明,护绿最佳工艺为:含锌离子浓度300μg/mL、铜离子浓度500μg/mL的浸泡汁液,70℃浸泡温度和1h浸泡时间;保脆最佳工艺为含0.1%氯化钙、3.0%食盐的浸泡汁液,2h浸泡时间;保藏汁液最佳配比为0.1%醋酸、0.02%山梨酸钾、3.0%食盐、0.1%氯化钙和0.1%异Vc钠;最佳杀菌工艺为75℃杀菌40min。椿芽经上述处理后能长久的保持色泽、脆度和香味。     

茭白加工过程中的护绿研究

以新鲜茭白为原料,通过CuCl2、ZnCl2、CaCl2和柠檬酸的护绿单因素实验与联合护色的L9(34)正交实验,研究了不同种类的护绿液,在不同浓度条件下,采用烫漂、常温浸泡等护绿措施,对茭白叶护绿效果的影响.结果表明:用浓度为300mg/kg的CuCl2、ZnCl2、柠檬酸和浓度为250mg/kg的CaCl2复合护绿液,在100℃温度下烫漂90s,护绿效果最佳.     

猕猴桃酒发酵过程中的护绿方法研究

为了获得色泽好且稳定的猕猴桃酒,现以杨凌"秦美"猕猴桃为试材,对其果酒生产主要环节的护绿技术进行优化,研究采后贮藏时间、不同的果汁护绿剂、发酵温度、酒成品贮藏温度以及光照条件对猕猴桃酒护绿及护绿效果的影响,通过测定叶绿素、类胡萝卜素的含量,结合感官评定选出较佳的护绿条件。结论为:猕猴桃采后贮藏30 d色素能较好的保持,其清汁中加入的护绿剂最优复配组合浓度分别为2220 mg/L CaCl_2、101.5 mg/L Zn(CH_3COO)_2、1 mg/L CuSO_4和40 mg/L EDTA-2Na。在15℃发酵且猕猴桃酒在(0±0.5)℃或(5±0.5)℃避光玻璃瓶中贮藏,其叶绿素的含量最高。该技术参数为色泽较佳的猕猴桃酒生产提供了理论指导。     

仙人掌发酵醋饮的研究

以仙人掌为原料,讨论了仙人掌制汁的工艺及护色条件,结果表明:仙人掌用0.15%的NaHCO3溶液在50℃浸泡5h、再用100℃水浸5min处理后,出汁率最高,打浆时添加0.01%EDTA和0.15%抗坏血酸护色效果良好;研究了仙人掌醋酸发酵的工艺及仙人掌醋饮的产品定型等,表明仙人掌果汁醋酸发酵的最佳工艺条件:发酵温度36℃、菌种接入量14%、发酵时间56h、初始酒精度10%,调配醋饮的最佳配方为糖10%、pH3.0、芦荟香精0.05%、白柠檬香精0.015%。     

绿叶蔬菜的护色腌制保藏技术研究

常温下采用不易被H 取代的Zn2 、Cu2 、Cr3 替代叶绿素中Mg2 进行新鲜芹菜的护绿,从常温浸泡时间、金属离子浓度、腌制盐浓度等三方面考察了最佳护绿条件,并分析了护绿后芹菜的果胶含量。结果显示,芹菜在Zn2 (250mg/kg) Cu2 (200mg/kg)的护绿液(pH6.0)中常温浸泡12h为最佳护绿条件,最佳腌制贮藏的盐水浓度为20%。实验表明,产品的残留重金属离子含量明显低于相关的国家卫生标准。     

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.