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建立间接酸量滴定法测定家禽组织中铝含量的分析方法。样品经湿法消解,在用酒石酸钠掩蔽Fe3+后的pH7~8的消化液中,用稀氢氧化钠溶液将铝沉淀为氢氧化铝,沉淀完全后,加入氟化钾,反应置换出的氢氧化钾溶液,以酚酞为指示剂,用酸标准溶液进行滴定。结果表明,改进后的本法,具有简单、准确、快捷、干扰现象不明显等特点,测定结果的相对标准偏差小于2.5%,平均回收率在96.6%~99.5%之间,准确度和精密度与标准方法一致,相对偏差小于3.0%。 相似文献
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为了分析禽肉中的矿物质含量及营养价值,于深圳市大型农贸市场采集老母鸡、走地鸡、乌骨鸡、鹌鹑以及鹧鸪5种禽肉,对其中的钙、钾、钠、镁、铁、锌、铜、锰、碘、硒、钼11个矿物质元素进行测定分析,并采用营养质量指数法对禽肉中矿物质含量进行营养评价,同时比较禽肉与猪肉、牛肉、羊肉的矿物质营养水平。结果表明,鹌鹑和鹧鸪的矿物质营养价值大于老母鸡、走地鸡和乌骨鸡,除了鹌鹑中的钙和锰元素和鹧鸪中的钠和锰元素外,鹌鹑和鹧鸪中其他元素INQ值均大于1,以鹧鸪中钙的营养价值最为突出,INQ值高达5.69,是其他4种禽类的10倍~50倍。此外,相比于猪肉、牛肉和羊肉的矿物质营养价值,5种禽肉中各元素的INQ值整体水平较高,尤其是相较于猪肉,禽肉有更好的矿物质营养水平。因此,禽肉具有较高的矿物质营养价值,是居民良好的肉类食材选择,其中以鹧鸪和鹌鹑最为突出。 相似文献
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Marrow from cervical, lumbar and femur bones of 5 steers and 5 cows fed only on native range (grass fed) and 5 steers and 5 cows fed a finishing ration (grain fed) was analyzed for cholesterol content. The cholesterol content of the marrow was significantly different when diet or anatomical locations were compared. Bovine marrow from grass-fed animals averaged 119.6 mg/100g and marrow from grain-fed animals averaged 150.6 mg/100g marrow. The cholesterol content of marrow from the cervical, lumbar, and femur was 190.1, 124.1, and 91.0 mg/100g marrow, respectively. Mechanically deboned meat (MDM) and beef lean had a mean cholesterol content of 153.3 and 50.9 mg/100g tissue. Spinal cord material in MDM can account for the increased concentration of cholesterol in some MDM samples over the values for lean and marrow. 相似文献
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The aim of this study was to examine variability in cholesterol content and fatty acid composition in musculuslongissimus (MLLT) of various genotypes of pigs. Out of 30 male castrated animals used in the trial, 20 were Mangalitsa pigs (Swallow Belly - SBM and White - WM) while 10 were of the Swedish Landrace breed – SL. The representative of pig meat breeds, SL had significantly less cholesterol in MLLT compared to SBM and WM pigs. The total monounsaturated fatty acids (MUFA) and unsaturated fatty acids (USFA) content was higher in SBM and WM than in SL pigs (p< 0.001). 相似文献
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目的:对GB/T5009.87-2003中样品处理过程进行改进,建立一套微波消解处理法.方法:使用微波消解仪,在肉与肉制品中加入硝酸密闭消解,消解液用磷钼蓝分光光度法在660nm波长处测定样品中磷的含量.结果:微波消解技术可将样品消解完全,采用磷钼蓝分光光度法测定体系中磷酸盐(以磷酸根计)的含量在0~150 μ g(25ml比色管)时,磷酸盐的含量与吸光度呈线性关系,相关系数0.9999;对实际样品的加标平均回收率在97.0%-105.5%之间.结论:该法操作简单,试剂用量少、重现性好,用微波消解技术大大缩短了样品前处理时间,适于肉与肉制品中磷酸盐含量的测定. 相似文献
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分光光度法测定畜禽骨素中胶原蛋白含量 总被引:2,自引:0,他引:2
本文提供了一种快速、简单、准确、成本低的畜禽骨素中胶原蛋白含量的测定方法。通过热法和酸法提取畜禽骨中胶原蛋白,计算其中胶原蛋白与羟脯氨酸含量的比值,得到不同原料骨的胶原蛋白换算系数:猪骨为6.12-6.17,牛骨为6.77,鸡骨为6.27-6.30,羊骨为6.34-6.35,结果表明水溶性和酸溶性的胶原蛋白换算系数差异不显著(P〉0.05)。根据骨素生产实际情况,选用水溶性胶原蛋白换算系数作为骨素中胶原蛋白测定的换算系数,用分光光度法测定热提骨素中羟脯氨酸含量,乘以对应的胶原蛋白换算系数,得到猪骨素、牛骨素和鸡骨素中胶原蛋白含量分别为9.19%、7.92%、9.78%。该方法测定骨素中胶原蛋白含量的相对标准偏差在0.01-0.03%之间,变异系数在0.44-2.26%之间,平均回收率在99.36-100.44%之间,说明分光光度法适用于骨素中胶原蛋白含量的测定。 相似文献
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RACHAMIM PALOMBO PIETER S. VAN ROON ALBERT PRINS BEREND KROL 《Journal of food science》1991,56(5):1453-1454
Measurement of air content in meat batters is useful, as larger amounts of air negatively affect some properties of comminuted products. Three methods were compared. One method (Vemag) involved liberation of entrapped air from the batter by the combined effects of vacuum and mechanical forces. The other two methods involved application of under- (Smrat) or over- (Handtmann) pressure and calculation of the air content using Boyle's ideal gas law. The Smrat showed the lowest reproducibility. However, being the most rapid and easy to use, it was the method of choice for routine quality and process control. The Vemag and more favorably the Handtmann were recommended for accurate and reproducible determinations. 相似文献
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GC-MS法测定烟熏腊肉中的甲醛含量 总被引:1,自引:0,他引:1
以烟熏腊肉为研究对象,经过条件优化,建立用气相色谱-质谱测定烟熏肉制品中甲醛含量的方法。结果 表明,最优的衍生化处理与萃取的条件为:加入0.3 mL 2,4-二硝基苯肼,衍生化温度60 ℃,衍生化时间30 min,用 二氯甲烷进行萃取,萃取2 次;根据已建立的烟熏腊肉中的甲醛检测方法,低、中、高3 个水平的平均回收率依次 为79.8%、84.0%以及89.4%;重复性相对标准偏差为2.89%,检出限为0.50 mg/kg。该方法简便快速、结果准确、灵 敏度高,可作为测定烟熏肉制品中甲醛的有效方法。 相似文献
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GC-MS法测定食品中胆固醇含量的研究 总被引:2,自引:0,他引:2
目的:建立一种简单、快速而又重现性好的胆固醇测定方法,以监测食品中胆固醇的确切含量。方法:饼干样品经石油醚萃取后用50% KOH-乙醇(40:12)皂化后用乙醚二次萃取,上层溶液水洗至中性后无水Na2SO4脱水过滤并浓缩至1ml,氮气吹干后用正己烷溶解,注入GC-MS进行定量分析。研究结果显示,该方法胆固醇的回收率在96.64%~100.13%之间,平均值为98.43%。方法的精密度高,重现性好,标准偏差S=0.02193,相对标准偏差RSD(n=6)=1.4393%,最低检测限为0.0659μg/ml,最小定量限为0.22μg/ml:若以称样量0.5g计算,方法的最低检测限为1.318μg/g。 相似文献
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[Objective]The aim was to find a way to measure the cholesterol content in deserted oil.[Method]Dual-wavelength spectrophotometry method was used for the determ... 相似文献
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The Microbiology of Meat and Poultry 总被引:1,自引:0,他引:1
Martin R. Adams 《International Journal of Food Science & Technology》1998,33(2):193-194
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