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《食品工业》2015,(11)
以泡椒凤爪为试验材料,研究生姜、大葱、八角等7种香辛料的保鲜效果。采用正交试验方法优选出香辛料液最佳配方,即以250 m L黄酒为提取溶剂,生姜颗粒30 g、八角粉6 g、葱白颗粒60 g、干辣椒段15 g、当归粉15g、黄芪粉10 g、桂皮粉4 g,和最优超声辅助提取工艺,采用频率为40 k Hz的超声波设备在提取功率60%,温度70℃条件下提取20 min。将超声提取香辛料液应用于泡椒凤爪加工中,通过测定泡椒凤爪的水分活度、感官评定、菌落总数、挥发性盐基氮、p H,研究其对泡椒凤爪保鲜效果的影响。37℃保鲜试验结果表明,超声辅助提取香辛料液能够有效地保持鸡爪的贮藏品质,延缓水分活度、p H、挥发性盐基氮和菌落总数的升高。 相似文献
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为了降低大菱鲆即食制品水分活度,延长制品保藏期,选择丙三醇、乳酸钠、麦芽糖醇3种水分活度降低剂,在单因素试验基础上,根据Box-Behnken原理设计三因素三水平响应面试验,建立二次多项数学模型,并进行保藏实验。以水分活度为指标,得到大菱鲆即食制品水分活度降低剂的最佳配比为丙三醇添加量4.1 mL/100 g、乳酸钠添加量1.5 mL/100 g、麦芽糖醇添加量4.0 g/100 g,在此配比下含水量40%的大菱鲆即食制品水分活度为0.781。将产品在37℃贮藏7 d后其菌落总数为4.04(lg(CFU/g))、TVB-N值为12.47 mg/100 g、TBA值为1.48 mg/100 g,均在国家标准限量范围内。说明利用水分活度降低剂能有效提高产品的保藏性能,延长产品的保藏期。 相似文献
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栅栏技术在膏状肉类香精防腐中的应用 总被引:2,自引:0,他引:2
栅栏技术在膏状肉类香精防腐中有明显作用,膏状香精体系中水分活度、包装、保藏温度、辐照、防腐剂均应作为栅栏应用,水分活度Aw为主要栅栏因子,在充分运行HACCP体系的情况下,反应型产品以Aw<0.76为安全,酶解物Aw<0.74,不需添加防腐剂。 相似文献
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为提高真空冷冻干燥即食水竹笋的品质,采用真空包装袋、高温蒸煮袋、复合铝箔袋对即食水竹笋进行包装,4℃贮藏30 d,研究其水分含量、水分活度、脂肪含量、过氧化值4个指标的变化,并结合电子鼻分析挥发性物质的变化规律。结果表明:随着贮藏期的延长,3种包装的即食水竹笋的水分含量、水分活度、过氧化值逐渐升高,脂肪含量逐渐下降;电子鼻检测结果显示,氮氧化合物、萜烯类、含硫化物和芳香族化合物是即食水竹笋主要的挥发性成分,其释放量随着贮藏期的延长逐渐提高。贮藏30 d,与真空包装袋、高温蒸煮袋相比,复合铝箔袋包装即食水竹笋的水分含量最低,为2.8 g/100 g,水分活度增加最小,为0.04,脂肪损失最少,为2.6%,过氧化值增加最少,为5.2 g/100 g,挥发性物质变化最小。经综合评定,在4℃条件下,复合铝箔袋包装能够更好地保持即食水竹笋产品的品质。 相似文献
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不同工艺条件对酱腌菜保藏品质的影响 总被引:2,自引:0,他引:2
以萝卜为原料,进行酱菜制作,重点研究酱腌菜加工工艺条件对其保藏品质的影响,并确定了酱腌菜的最佳工艺.结果表明,不同防腐剂,酱腌菜水分含量以及杀菌温度、杀菌时间都不同程度地影响酱腌菜的保藏品质;采用天然生物防腐剂乳酸链球茵素与纳他霉素复配,可有效提高酱腌菜保藏性能;酱腌菜加工最佳工艺条件为乳酸链球菌素(200 mg/kg) 纳他霉素(150 mg/kg),控制酱腌菜水分含量为80%,杀菌温度85℃,杀菌时间15 min. 相似文献
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栅栏效应理论在高水分波纹巴非蛤肉软罐头开发中的应用 总被引:2,自引:0,他引:2
运用栅栏效应理论 ,合理设置多个强度缓和的栅栏因子 ,即杀菌强度、酸度 (pH)、水分活度、氧化还原电势及防腐剂 ,通过它们之间的交互作用 ,形成有效防止制品腐败变质的栅栏 ,开发出感官品质良好的风味波纹巴非蛤肉软罐头。实验结果表明 ,各栅栏因子的强度为杀菌温度 95~ 10 0℃ ,时间 3 0min ,pH 5 .5、水分活度 0 .90 ,添加 0 .0 5 %的山梨酸和山梨酸钾 ,并且采用真空包装 ,研制出的高水分波纹巴非蛤肉软罐头 ,较好地保持了鲜品的质地及风味 相似文献
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以市售凤爪为原料,建立凤爪凝胶特性的综合评价指标,研究压力、pH、氯化钠添加量和柠檬酸钙添加量对去骨凤爪凝胶强度、弹性、脆度和持水率的影响。试验结果表明:四个单因素均能显著提高凤爪的凝胶性能。各因素对去骨凤爪凝胶特性综合指标影响的主次顺序为:氯化钠添加量〉柠檬酸钙添加量〉压力〉pH。由正交试验结果表明去骨凤爪凝胶特性最佳的组合为:500MPa压力下保压25min、pH4.0、氯化钠添加量为1.0%,柠檬酸钙添加量为0.04%。在此组合下,去骨凤爪凝胶特性最好,综合指标为94.765。 相似文献
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以栅栏效应理论为指导,研究不同栅栏因子对高水分即食牡蛎产品的抑菌效果。通过合理设置多个强度缓和的栅栏因子,即杀菌温度、酸度(pH 值)、水分活度、包装方式,通过它们之间的交互作用,形成有效防止制品腐败变质的栅栏,开发出感官品质良好的高水分半干牡蛎食品。结果表明,各栅栏因子在不同强度下的抑菌效果不同,产品最适抑菌模式和强度为:在60℃烘烤2h,采用10% 醋酸加入量调节产品pH 值在5.5 左右,在调味时添加16% 的白砂糖调节产品的水分活度在0.90 左右,杀菌强度为100℃、30min,并且采用真空包装。研制出的高水分即食牡蛎产品,较好地保持了产品的质地和风味。 相似文献
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以谷物小米、黑米、黑玉米与牛奶为主要原料制备谷物牛奶复合发酵乳,以感官评分为评价指标,通过单因素试验和响应面试验对其发酵工艺条件进行优化,并对其贮存品质进行分析。结果表明,谷物牛奶复合发酵乳的最佳发酵工艺条件为:谷物与水按照料水比1∶15(g∶m L)打浆,以牛奶质量为基准,谷物浆添加量20%,发酵剂添加量0.55%、白砂糖添加量6%,在42℃条件下发酵6 h。在此优化条件下,谷物牛奶复合发酵乳的感官评分为93分,p H值为4.57,酸度为81.8°T,持水力为95%,黏度为11.5(Pa·s),蛋白质含量为3.32 g/100 g,花青素含量为5.33 mg/L;在2~4℃条件下贮存的保质期为21 d,保质期内乳酸菌活菌数≥1×106 CFU/m L。 相似文献
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Guynot ME Ramos AJ Sanchis V Marín S 《International journal of food microbiology》2005,101(2):161-168
A hurdle technology approach has been applied to control common mold species causing spoilage of intermediate moisture bakery products (Eurotium spp., Aspergillus spp., and Penicillium corylophilum), growing on a fermented bakery product analogue (FBPA). The factors studied included a combination of different levels of weak acid preservatives (potassium sorbate, calcium propionate, and sodium benzoate; 0-0.3%), pH (4.5-5.5), and water activity (a(w); 0.80-0.90). Potassium sorbate was found to be the most effective in preventing fungal spoilage of this kind of products at the maximum concentration tested (0.3%) regardless of a(w). The same concentration of calcium propionate and sodium benzoate was effective only at low a(w) levels. On the other hand, potassium sorbate activity was slightly reduced at pH 5.5, the 0.3% being only effective at 0.80 a(w). These findings indicate that potassium sorbate may be a suitable preserving agent to inhibit deterioration of a FBPA of slightly acidic pH (near 4.5) by xerophilic fungi. Further studies have to be done in order to adjust the minimal inhibitory concentration necessary to obtain a product with the required shelf life. 相似文献
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The objective of this study was to evaluate the shelf life of powdered guavira pulp obtained by a foam mat drying process. The dehydrated guavira pulp was packed into low density polyethylene (LDPE) bags and stored under two controlled conditions: environmental (25 °C, RH 75%) and accelerated (35 °C, RH 90%) for 90 days. The shelf life was accompanied by carrying out the following analyses every 10 days: moisture content, water activity, vitamin C content, pH and titratable acidity. Vitamin C was the quality attribute used to determine the shelf life of the product, by determining its degradation kinetics as a function of storage time. The linear regression data showed that the vitamin C degradation reaction fitted the zero and first order kinetic models. The shelf life of the powdered guavira pulp under environmental conditions was approximately 49 days, and under accelerated conditions (35 °C) 45 days. The Q10 was equal to 1.09, predicting a shelf life similar to that found under environmental conditions. The moisture content for these conditions was 10.0% e 5.4% for 35 °C and 25 °C, respectively. The above demonstrate the efficiency of the accelerated test in predicting the shelf life of the product. 相似文献
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The study was envisaged to develop and extend the shelf life of the highly perishable Indian traditional meat product, chevon (capine) keema, through the application of hurdle technology.The hurdles used were water activity (a(w)) and pH as variable hurdles as well as vacuum packaging, preservatives and heat treatment as constant hurdles. The water activity of the product was adjusted to 2 levels viz., 0.90 and 0.88 by the addition of humectants. The product with 0.90 was preferred for sensory quality. The pH of the keema was adjusted with lactic acid to 3 desired levels viz. 5.50, 5.65 and 5.80. The product with pH 5.8 was the most acceptable and with pH 5.50 was the least acceptable. Standardised keema with a(w) 0.90 and pH 5.80 was stored at ambient temperature (36.2±1.2°C) and evaluated for physico-chemical, microbiological and sensory characteristics. A gradual increase in moisture, a(w), thiobarbituric acid reactive substances (TBARS) number and tyrosine value were observed throughout the storage period. There was a decrease in the growth rate of aerobic and anaerobic counts and complete inhibition of Staphylococcus aureus. Although sensory scores for hurdle treated keema declined upon storage, the product was well accepted up to the 3rd day and fairly accepted up to 5th day whereas the keema prepared by the traditional method was acceptable only on the first day. Hurdle technology significantly improved the shelf life of keema. 相似文献