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中华绒螯蟹对常用饲料原料氨基酸的消化率 总被引:2,自引:0,他引:2
钱国英 《宁波大学学报(理工版)》1998,(4)
用Cr2O3间接测定法测定了中华绒螫蟹对秘鲁鱼粉、国产鱼粉、豆粕、麦麸、四号粉、虾肉壳粉、啤酒酵母粉等7种常用饲料中蛋白质和氨基酸的表现消化率.结果表明,中华绒螫蟹对这7种原料的蛋白质消化率分别为:90.45%、89.41%、8525%、69.05%、78.45%、89.65%和83.95%;总的氨基酸消化率为:91.83%、92.23%、86.33%、79,29%、79.86%、91.29%和84.99%.动物性原料的消化率均高于植物性原料.经分析,蛋白质和氨基酸的消化率与原料中的粗纤维含量呈负直线相关关系(rp=-0.6672P<0.1,rA=-0.8763,P<0.01). 相似文献
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Using LiF and YF3 as starting materials,we prepare feed material from fluorides according to the molar ratio of LiF:YF3=51.5:48.5.The anhydrous LiYF4 polycrystalline material is synthesized via the fluoridation process with a dried HF flow at elevated temperature.By charging the feed material and adding a small amount of active carbon powder in a sealed platinum crucible,the crystal can be grown via the vertical Bridgman method in a nonvacuum atmosphere.This is possible because the oxidization and volatilization of the melt is avoided.Using optimum conditions,that is,a growth rate of 0.5-0.6 mm/h and a temperature gradient of 25-30℃/cm across the solid-liquid interface under a furnace temperature of 920-930℃,the colorless crystal LiYF 4 with the size of φ25 × 50 (mm) is successfully grown.The optical transmittance of the crystal is as high as 85% above the absorption edge at 190 nm.The induced absorption bands are observed below 700 nm in the transmission spectrum after the crystal is subjected to a high dose of γ-ray irradiation. 相似文献
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液相色谱-串联质谱法测定饲料原料中26种霉菌毒素 总被引:1,自引:0,他引:1
建立了同时检测玉米、豆粕等饲料原料中脱氧雪腐镰刀菌烯醇等26种霉菌毒素的液相色谱-串联质谱(LC-MS/MS)方法。玉米和豆粕样品经乙腈-水-甲酸(84∶15.9∶0.1,V/V)超声提取1 h,取1 m L上清液经Mycospin 400多功能净化柱净化,浓缩干燥,0.25 m L水-甲醇-甲酸(95∶4.9∶0.1,V/V)复溶,上机测定。采用反相C18色谱柱分离,以0.1%甲酸-水和0.1%甲酸-甲醇溶液作为流动相进行梯度洗脱,采用多反应监测离子模式进行定性分析。基质效应考察发现,样品提取液经Mycospin 400多功能净化柱净化后,大部分毒素仍有较强的基质效应。因此,采用基质匹配标准曲线外标法进行定量分析。在高、中、低3种添加浓度水平下,26种霉菌毒素的平均回收率为61.9%~119.5%,相对标准偏差介于0.8%~18.6%之间。针对不同目标物,本方法的定量限为0.5~25μg/kg。 相似文献
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