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1.
冷却猪肉生产中保鲜技术的研究   总被引:15,自引:1,他引:14  
为了寻求天然、安全、效果良好的冷却猪肉保鲜剂,本试验筛选了乳酸菌肽、茶多酚、壳聚糖三种天然保鲜剂,用浸泡的方式对肉块进行处理,结合真空包装技术对冷却肉的保鲜效果进行研究,并测定菌落总数、TVB—N值和pH值指标。主要以TVB—N值来判定冷却肉最终新鲜度。结果表明:3种天然保鲜剂单独使用都有一定的保鲜效果,复合试验中对照组的保质期仅为7d,壳聚糖、Nisin复合组和壳聚糖、茶多酚、Nisni复合组均可使冷却肉的保质期达到15d以上,后者对冷却肉的保鲜效果明显优于其它组,可使保质期达到21d以上。  相似文献   

2.
生物保鲜和辐射保鲜技术在冷却肉上的应用研究   总被引:4,自引:8,他引:4  
本文利用自制的天然生物保鲜剂,结合真空包装和辐照保鲜技术,从细菌总数、TBA、TVB-N和感官指标等方面,考察了综合保鲜技术对冷却肉的保鲜效果。结果表明,生物保鲜剂和辐照技术对冷却肉的保鲜具有协同作用,经真空包装,保质期可以达到21天以上。  相似文献   

3.
壳聚糖和气调包装在冷却肉保鲜中的应用   总被引:3,自引:0,他引:3  
利用不同浓度和不同溶解性的壳聚糖,以及不同气体配比的气调包装对冷却肉进行保鲜处理,比较其保鲜效果.结果表明壳聚糖在鲜猪肉中有明显的保鲜作用,且浓度越高,保鲜效果越好 ;酸溶性壳聚糖的保鲜效果好于水溶性壳聚糖,2.5%的水溶性壳聚糖能使冷却肉保质期达到5d左右,而1.5%的壳聚糖醋酸溶液能使保质期达到6d, 但会使肉样产生酸味,影响感官.与壳聚糖相比较,气调包装对冷却肉具有更好的保鲜效果,且感官质量也更好, 气体配比为50% O2 +25%CO2+25%N2的处理组效果最佳,能使冷却肉保质期达到7d以上;气体配比中二氧化碳的含量越高,保鲜效果越好;氧气含量超过50%以上时,肉样还具有良好的鲜红色泽.  相似文献   

4.
壳聚糖和气调包装在冷却肉保鲜中的应用   总被引:36,自引:5,他引:31  
利用不同浓度、不同溶解性的壳聚糖,以及不同气体配比的气调包装对冷却肉进行保鲜处理,比较其保鲜效果。结果表明:壳聚糖在鲜猪肉中有明显的保鲜作用,且浓度越高,保鲜效果越好;酸溶性壳聚糖的保鲜效果好于水溶性壳聚糖,2.5%的水溶性壳聚糖能使冷却肉保质期达5d左右,而1.5%的壳聚糖醋酸溶液能使保质期达到6d,但会使肉样产生酸味,影响感官。与壳聚糖相比,气调包装对冷却肉具有更好的保鲜效果,且感官质量也更好,气体配比为50%O2+25%CO2+25%N2的处理组效果最佳,能使冷却肉保质期达到7d以上;气体配比中二氧化碳的含量越高,保鲜效果越好;氧气含量超过50%以上时,肉样还具有良好的鲜红色泽。  相似文献   

5.
采用乙醇提取法从芦笋下脚料中提取抗菌活性物质,用其对冷却肉进行涂膜处理,以感官指标、菌落总数、pH、挥发性盐基氮(TVB-N)的变化为指标,评价芦笋提取物对冷却肉的保鲜效果。结果表明,芦笋提取物对冷却肉具有一定的保鲜效果,与对照组相比,经芦笋提取物涂膜处理后,可以使冷却肉的保质期延长6 d。  相似文献   

6.
研究了洋葱、生姜和大蒜提取物对冷却肉的冷藏保鲜效果。冷却肉分别用洋葱、生姜和大蒜提取物溶液浸泡3min,以蒸馏水浸泡作为对照,晾干后用聚乙烯薄膜密封包装,于4℃下贮藏,分别测定冷却肉在冷藏期间感官指标、保水能力与汁液流失率、pH与酸度、挥发性盐基氮(TVB-N)和硫代巴比妥酸反应物值(TBARS)的变化规律。结果表明:洋葱、生姜和大蒜提取物均能显著抑制冷却肉冷藏过程中感官评分和酸度的下降,延缓汁液流失率及pH的上升,提高冷却肉的保水能力,有效阻止TBARS值及TVB-N值的增加,使冷却肉贮藏品质得到明显改善;三者中以大蒜提取物保鲜效果最佳,可将冷却肉的保质期延长到12d以上。  相似文献   

7.
为了延长冷却肉的货架期,文中采用不同浓度茶多酚结合壳聚糖与可食性膜溶液混合制成涂膜保鲜剂,通过测定贮存过程中冷却肉的细菌总数、挥发性盐基氮(TVB-N值)、pH值、色差值、硫代巴比妥酸值(TBA值)等指标的变化,对冷却肉保鲜效果进行研究。结果表明:0.7%茶多酚、1.0%壳聚糖涂膜保鲜冷却肉效果较好,显著优于对照组和单纯使用壳聚糖涂膜保鲜组,在0~4℃条件下能将冷却肉保鲜期延长至16 d以上。  相似文献   

8.
壳聚糖联合茶多酚对南湾鳙鱼肉的保鲜效果   总被引:2,自引:0,他引:2  
目的:分析壳聚糖与茶多酚对南湾鳙鱼肉进行涂膜保鲜的可行性。方法:用壳聚糖和茶多酚混合液处理南湾鳙鱼肉,结合PE保鲜袋包装低温贮藏,评定鱼肉冷藏过程中质地、色泽及气味的变化,并测定其pH、挥发性盐基氮(TVB-N)等理化指标和细菌总数的变化,研究壳聚糖和茶多酚联合对南湾鳙鱼的保鲜效果。结果:壳聚糖中添加茶多酚可明显抑制鱼肉pH、TVB-N值和细菌总数的上升、感官品质下降较慢。结论:壳聚糖联合茶多酚对鳙鱼肉的保鲜效果优于单一保鲜剂和不处理组,1%壳聚糖+0.3%茶多酚的复合保鲜剂对鳙鱼肉的保鲜效果最佳,鱼肉的保质期比对照延长10d以上。  相似文献   

9.
以样品细菌总数、TVB-N值、pH及感官评分为指标,探讨超声波协同中草药提取液对牛肉丸的保鲜效果.试验结果表明:超声波与中草药液的协同作用对牛肉丸有较好的保鲜效果,可使其在0℃~4℃条件下的贮藏期达至12 d~15 d左右,相比对照组可延长保质期3d~6d.  相似文献   

10.
对冷却鲜猪肉分别用保鲜剂(含乳酸钠5%、异维生素C钠0.2%和乙酸0.4%的混合保鲜溶液)处理加PE塑料袋包装、PF/PA塑料袋气调包装(25%CO2、25%N2和50%O2混合气体)和保鲜剂处理加PF/PA塑料袋气调包装,与PE塑料袋包装对照,研究其在0~4℃冷却保存条件下不同处理方法的保鲜效果。每隔2d对猪肉进行感官评定、测定其TVB-N值、菌落总数,并进行球蛋白沉淀试验,以判定猪肉新鲜度的变化。结果表明:PE/PA塑料袋气调包装和保鲜剂处理均明显延长冷却鲜猪肉的保存期,可使其保存期分别达到12d和9d:两者同时应用效果更好,可使冷却鲜猪肉的保存期达到15d以上;气调包装的冷却保存猪肉颜色始终保持鲜红状态;课题组自主设计、制造的气体比例混合器,用于冷却肉的气调包装,保鲜效果优良。  相似文献   

11.
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   

12.
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   

13.
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   

14.
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   

15.
16.
BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H2O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.  相似文献   

17.
A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.  相似文献   

18.
A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.  相似文献   

19.
20.
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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