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微生物及微生物酶作用于脂肪和蛋白质发生水解氧化反应,反应及反应产物相互影响使发酵肉制品呈现出复杂的体系。发酵肉制品中的微生物对其产生的作用具有两面性。一方面,微生物的酶作用于肉中的各成分,降解了大分子物质使发酵肉制品营养物质更易吸收,且蛋白质和脂肪适度水解氧化呈现出特殊发酵风味;另一方面,微生物可能产生有毒物质,还可能导致脂肪和蛋白质过度氧化,从而产生食用危险,危害人体健康。调控肉制品的水解氧化程度对其品质具有重要意义。本文主要综述了微生物对发酵肉制品中脂肪及蛋白质的水解氧化作用及益生菌和益生素对发酵肉制品氧化稳定性的影响等。 相似文献
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在肉制品贮藏和加工过程中,脂质水解是影响肉制品质量和风味的重要影响因素之一。脂质水解主要是由于脂肪酶的作用,不同的内源性脂肪酶作用于不同的脂质位点,进而使得脂质水解形成不同的醛类、醇类、酯类、烃类等物质,这也在很大程度上影响肉制品风味。适当的水解有利于改善肉制品的风味,但是过度水解会导致肉制品的品质下降,出现蛋白氧化、哈喇味等现象。同时,脂质水解和脂质氧化之间具有一定的联系,脂质水解所形成的游离脂肪酸会发生氧化,导致肉制品的品质下降,风味物质减少。控制脂质水解程度有利于提高肉制品的品质,确定更加有利于肉制品贮藏和加工的条件。脂质水解对不饱和脂肪酸影响较大,脂肪酶对脂质位点的作用也受到众多学者的关注。本文综述肉及肉制品中脂质水解及其发生机制、肉品中脂质水解所导致的化学变化、脂质水解对肉及肉制品品质和风味的影响。 相似文献
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即食发酵肉制品有着悠久的加工制作历史,因其营养丰富且具有独特的色泽和风味而深受消费者欢迎。迄今为止,未见即食发酵肉制品的熟化过程及其机制的全面综述。本文结合了近年来即食发酵肉制品相关研究进展,系统地阐述了其熟化过程中理化性质的变化,包括蛋白质和脂质的水解氧化、风味物质的形成以及质构的变化等。同时也总结了影响熟化的因素及其作用机制,包括酶的水解、发酵剂的抗氧化等以及腌制剂的呈味和增色的作用机制。最后讨论了现今研究存在的不足,并对未来的研究方向进行了展望,旨在为即食发酵肉制品的深入研究和发展提供理论依据。 相似文献
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发酵肉制品因生产周期较长、营养物质丰富,极易受到微生物的污染,从而影响产品品质并对人体健康带来不利的影响。由于消费者对发酵肉制品风味以及安全性的关注日益增加,因此对肉制品的安全性以及风味特征的研究非常重要。乳酸菌是最早从发酵肉制品中分离出来的微生物,是传统发酵肉制品中重要的优势菌群,与产品品质密切相关。在发酵肉制品中,乳酸菌不仅可以产生具有抑菌作用的物质抑制有害微生物生长,提高肉制品的安全性;还可以通过影响碳水化合物代谢、蛋白质以及脂质的分解氧化,从而改善发酵肉制品的风味。本文主要从乳酸菌影响发酵肉制品中有害微生物的生长、提高产品安全性及其对风味形成的影响方面进行综述,以期为今后发酵肉制品的研究提供新思路。 相似文献
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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. 相似文献
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John Gilbert Catherine Simoneau David Cote Achim Boenke 《Food Additives & Contaminants》2000,17(10):889-893
An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium. 相似文献
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Sophie Guillot Laurence Peytavi Sylvie Bureau Renaud Boulanger Jean-Paul Lepoutre Jean Crouzet Sabine Schorr-Galindo 《Food chemistry》2006
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. 相似文献
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Jesus Simal-Gandara Miguel Sarria-Vidal Arjen Koorevaar Rinus Rijk 《Food Additives & Contaminants》2000,17(8):703-711
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. 相似文献
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M. S. Garcí a-Falc n J. Simal-G ndara S. T. Carril-Gonz lez-Barros 《Food Additives & Contaminants》2000,17(12):957-964
A simple, rapid and inexpensive method has been developed for the determination of benzo[a 相似文献
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H. J. Van Den Top A. Boenke P. A. Burdaspal J. Bustos H. P. Van Egmond T. Legarda A. Mesego A. Mourino W. E. Paulsch C. Salgado 《Food Additives & Contaminants》2001,18(9):810-824
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. 相似文献
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《肉类研究》2014,(2)
<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 相似文献
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《印刷工业》2014,(11):95-95
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%. 相似文献
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《印刷工业》2014,(8):103-103
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 相似文献