共查询到19条相似文献,搜索用时 62 毫秒
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冻藏于不同温度下做不同处理方法的草鱼肉质构变化的研究 总被引:2,自引:0,他引:2
研究了草鱼的冻藏温度和质构之间的关系。将草鱼背部肉分为不作处理的对照组和镀冰衣组,将两组草鱼样品分别在-18、-25、-30、-80℃4个温度下共贮藏360d,每隔15d对草鱼肉进行质地多面剖析(Texture Profile Analysis,TPA)模式的测定。选用硬度、恢复性、弹性、胶黏性和咀嚼性这五个指标作分析。结果表明,随着冻藏时间的延长,各项指标均都在下降。冻藏于-80℃下的草鱼肉的各项指标最高,冻藏于-18℃下的草鱼肉的各项指标则最低。同时发现,在同一冻藏温度下,镀冰衣组的各项指标要高于对照组的各项指标。 相似文献
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研究了草鱼的冻藏温度和质构之间的关系。将草鱼背部肉分为不作处理的对照组和镀冰衣组,将两组草鱼样品分别在-18、-25、-30、-80℃4个温度下共贮藏360d,每隔15d对草鱼肉进行质地多面剖析(Texture Profile Analysis,TPA)模式的测定。选用硬度、恢复性、弹性、胶黏性和咀嚼性这五个指标作分析。结果表明,随着冻藏时间的延长,各项指标均都在下降。冻藏于-80℃下的草鱼肉的各项指标最高,冻藏于-18℃下的草鱼肉的各项指标则最低。同时发现,在同一冻藏温度下,镀冰衣组的各项指标要高于对照组的各项指标。 相似文献
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通过对不同冻藏时间游离氨基酸和呈味核苷酸含量分析,探究养殖大黄鱼滋味组分物质的变化规律。结果显示,养殖大黄鱼冻藏过程中游离氨基酸含量波动较大,ΣUAA和ΣSAA在第180天最高;ΣBAA无明显变化;AMP含量在第90天最高,IMP的TAV值始终大于1,为养殖大黄鱼肉呈现鲜甜滋味贡献最大,属于滋味活性物质;除0 d外,养殖大黄鱼冻藏180 d EUC值最高。表明随着冻藏时间的延长,养殖大黄鱼整体滋味呈波动变化,冻藏0 d和180 d养殖大黄鱼鲜甜味和呈味丰富性较强,风味品值较好。 相似文献
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目的研究模拟物流条件下养殖大黄鱼品质及新鲜程度的变化。方法设定4种物流模型,分别测定模拟物流条件下养殖大黄鱼pH、挥发性盐基氮(total volatile basic nitrogen,TVB-N)、菌落总数、K值、三甲胺(trimethylamine oxide,TMA)、硫代巴比妥酸(thiobarbituric acid,TBA)的变化。结果 4种模拟物流条件中温度变化大及空气包装条件下的养殖大黄鱼品质变化较大,温度变化大的真空包装条件下的养殖大黄鱼品质变化居中,温度变化小真空包装条件下的养殖大黄鱼品质变化小。温度变化对养殖大黄鱼的品质影响较大。对比终点时间的2个模型,模型Ⅱ-真空的TMA(2.42 mg/100 g)小于模型Ⅰ-真空(3.19 mg/100 g)。模型Ⅱ-真空中TVB-N(28.47 mg/100 g)远小于模型Ⅰ-真空(52.80 mg/100 g)。结论模型Ⅱ-真空的物流条件可以更好地保持养殖大黄鱼的品质。 相似文献
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采用高压转换冷冻法(PSF法)和常规空气冷冻法(CAF法)冷冻大黄鱼,并在-20℃下储藏3个月。结果表明,CAF法生成的冰晶大而少,肌纤维严重收缩和变形,相反PSF法生成的冰晶少而多,分布均匀,对肌纤维的破坏程度小,且205MPa下冰晶更小。3个月后PSF冷冻的样品组织显微结构均没有明显改变;PSF法冷冻的样品在冻藏期间盐溶性蛋白含量均没有显著变化(p>0.05),而CAF法冷冻的样品在冻藏期间盐溶性蛋白含量显著减少(p<0.05);较之CAF,PSF法冷冻的样品弹性和咀嚼性均显著提高(p<0.05)。因此,PSF法在大黄鱼保鲜方面具有潜在的应用前景。 相似文献
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本文重点研究-20、-40、-80℃冻藏温度对大黄鱼色泽、感官、质构和抗氧化性的影响,并对感官各指标评分与感官综合得分进行比较。结果表明,与新鲜大黄鱼冻藏第0d(对照组)相比,不同冻藏温度下第60d的色泽均发生显著变化(p<0.05),-20℃色泽变化幅度最大。时间延长导致感官各指标评分和综合得分下降,口感变差,综合得分能整体反映出鱼肌肉的感官变化情况,硬度、胶着性、咀嚼性和回复性下降,弹性先上升后下降,-80℃感官综合评分和质构指标下降最缓慢。丙二醛含量(MDA)增加,总抗氧化能力(T-AOC值)、超氧化物歧化酶(SOD)活力和谷胱甘肽过氧化物酶(GSH-PX)活力明显下降,-80℃抗氧化性指标变化速率最慢。冻藏温度越低,大黄鱼色泽、感官、质构和抗氧化性指标变化越缓慢,为大黄鱼冷冻保存提供数据支持。 相似文献
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Frantisek Vacha Milos Cepak Martin Urbanek Pavel Vejsada Petr Hartvich Michael Rost 《International Journal of Food Properties》2013,16(2):241-250
The aim of the work was to measure and confirm changes in the qualitative properties of frozen carp flesh (Cyprinus carpio L.) during 84 days of storage at -20°C, using instrumental texture profile analysis focused on hardness, cohesiveness, and springiness. Hardness in fresh fish was 2.908 N, in fish stored 28 days 1.238 N, after 56 days 0.505 N, and after 84 days 0.491 N. Cohesiveness (dimensionless unit) in fresh fish was 0.838, after 28 days 0.740, after 56 days 0.720, and after 84 days 0.712. Springiness (dimensionless unit) in fresh fish was 0.682, after 28 days 0.625, after 56 days 0.577, and at 84 days of storage 0.534. The texture profile analysis effect was determined by several regression and linear models. It is possible to calculate a certain time period in which changes develop up to the level of 50% of deterioration—in hardness 17.5 days and in cohesiveness 12.9 days, as this was proven to a defined significance level (P > 0.01). Only changes in springiness showed a linear regression in the level of 0.002 (rounded) for each day. Studies showed that the intensity of the most important changes in instrumental textural properties occurred during the initial 56 days after freezing and after up to 84 days of storage the changes continued at a lesser rate. 相似文献
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Bülent Ergönül 《International Journal of Food Properties》2013,16(7):1530-1533
Traditional mesir paste bar samples were kept at different temperatures (4 ± 1°C, 20 ± 1°C, or 30 ± 1°C) and their textural properties were determined by conducting instrumental texture profile analysis. Total sugar content of mesir was 85 g/100 g sample, whereas the inverted sugar amount was 79 g/100 g. Saccharose content of mesir was 10 g/100 g. It was determined that temperature significantly affected the textural attributes of mesir paste samples (P < 0.05). Hardness of mesir paste kept in a refrigerator was 2241 N, whereas it was 273 N and 8.24 N for the samples kept at ambient temperature and 30 ± 1°C, respectively. 相似文献
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生物胺是影响养殖大黄鱼贮藏品质的重要因素,研究探讨不同贮藏温度下生物胺、菌落总数、p H值、挥发性盐基氮及三甲胺的变化规律,并对生物胺与其他品质指标进行相关性分析。结果表明,贮藏温度对养殖大黄鱼生物胺等品质指标具有显著的影响,随着贮藏温度的升高,品质下降速度加快。25℃和4℃贮藏条件下,养殖大黄鱼菌落总数分别于18 h和6 d超出临界值,达到5.56 lg(CFU/g)和5.03 lg(CFU/g),挥发性盐基氮分别于36 h和10 d超出临界值,达到33.85 mg/100 g和31.81 mg/100 g。研究发现腐胺和尸胺与其他品质指标均显著相关,通过SPSS回归分析,建立相应的回归方程,相关系数R~2分别为0.915和0.766。 相似文献
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ABSTRACT: A novel process using pH-shift to recover fish proteins has been intensively studied. However, little information of its frozen stability has been revealed. The highest gel texture was found for samples frozen at pH 5.5 (5) and 7.0 (7) with cryoprotectants (C) and without freeze/thaw (F), whereas the lowest gel texture was obtained from frozen/thawed samples without cryoprotectants (NC). 5NC-F and 7NC-F demonstrated the lowest surface hydrophobicity and total sulfhydryl (SH), perhaps suggesting more protein aggregation through hydrophobic interactions and disulfide bonds. A slightly less stability of alkali-treated protein isolates (AKPI) kept at pH 5.5 than at pH 7 was noticed. AKPI, whether kept at pH 5.5 or 7.0, requires cryoprotectants to maintain frozen stability for longer shelf life. 相似文献