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高效液相色谱法测定青贮饲料桑中的乳酸、乙酸和丙酸含量条件探讨 总被引：1，自引：0，他引：1
本文应用高效液相色谱法（HPLC）对青贮饲料桑中的乳酸、乙酸和丙酸含量测定进行了研究。通过对色谱柱、流动相、流速及样品处理条件进行优化，建立了一种应用HPLC法同时测定青贮饲料桑中乳酸、乙酸和丙酸含量的方法。研究结果表明：乳酸、乙酸和丙酸在一定浓度下具有良好的线性关系，且相关系数R2均大于0.999，加标回收率为98.35% ~ 104.24%，标准品中回收率和精密度试验相对标准偏差（RSD）为0.01%~0.58%，表明该方法准确性较好。3种物质检出限为4.928 ~ 9.489 mg/L，适用于青贮饲料桑中有机酸的定量检测。
[关键词] 高效液相色谱（HPLC）|青贮饲料桑|乳酸|乙酸|丙酸 相似文献
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To evaluate the importance of acetic acid and 3-hydroxybutyric acid (3-HB) in cerebrospinal fluid (CSF) of cattle, CSF samples were taken from a population of 60 cattle including healthy and sick animals with central nervous disorders. Mean acetic acid and 3-HB levels in blood plasma were 0.30 (SD 0.24) and 0.30 (SD 0.28) mM, and those in CSF were 0.14 (SD 0.06) and 0.08 (SD 0.07) mM, respectively. Significant differences were observed between plasma and CSF samples for both acetic acid and 3-HB levels. Acetic acid levels in CSF showed less relationship with those in blood plasma, whereas plasma 3-HB levels accompanied proportional changes with its CSF levels, which were about 30% of plasma 3-HB. It was revealed that both acetic acid and 3-HB levels in plasma and CSF have less relationship to glucose levels in plasma and CSF; therefore, the decrease of glucose levels in plasma or CSF is not necessarily accompanied by hyperketonemia. 相似文献
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为分析评价鲜牦牛肉的氨基酸及脂肪酸组成及营养价值,采用氨基酸分析仪测定了氨基酸并进行氨基酸评分(AAS),脂肪酸甲酯的气相色谱分析法分析了脂肪酸。结果表明:从新鲜牦牛肉中检测出十七种氨基酸和十种脂肪酸。新鲜牦牛肉的氨基酸总量为19.19g/100g,EAA/TAA为38.83%,EAA/NEAA为63.31%;脂肪含量3.99g/100g,脂肪酸含量为51.63%。鲜牦牛肉是一种具有独特风味的优质蛋白质来源,也是具有均衡脂肪酸的高营养价值的鲜肉。 相似文献
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建立了HPLC法测定复方多聚甲醛粉中水杨酸和苯甲酸的方法。采用AgilentZORBAXEclipseXDB-C18色谱柱（4．6mm×250mm,5μm）,以0．05mol／L磷酸二氢钾溶液（pH6．0）-甲醇（90：10）为流动相,流速1．0mL／min,检测波长230nm,柱温40cC,进样量10μL,以外标法定量。水杨酸和苯甲酸在1．0～50μg／mL范围内均线性关系良好,相关系数r均为0．9999,平均回收率分别为99．06％～99．69％（RSD=0．09％～0．63％）和99．12％～99．73％（RSD=0．16％～0．48％）,n=3。本方法简便、准确,可快速测定复方多聚甲醛粉中水杨酸和苯甲酸的含量,为产品质量控制提供了依据。 相似文献
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Knowledge of the fatty acid profile of microbial lipids is of great nutritional importance to the animals and, subsequently, their products. This study was conducted to examine the fatty acid profiles of mixed rumen bacteria and protozoa. Bacterial and protozoal cells were isolated by differential centrifugation of rumen contents. The main fatty acids were palmitic (16:0) and stearic (18:0) in both the bacterial and protozoal fractions. Palmitic acid was 74% greater in the protozoal fatty acids than in the bacterial fatty acids, whereas bacteria had 2.25-times greater stearic acid (18:0) proportions compared with protozoa. The total odd-chain plus branched-chain fatty acids were 16.5% of bacterial fatty acids and 11.0% of protozoal fatty acids. The anteiso-17:0 proportions in bacterial and protozoal fatty acids were 1.4 and 2.9%, respectively. The most abundant trans-18:1 isomer, vaccenic acid (18:1 trans-11), was 6.6% of total fatty acids in protozoa and 2.0% of total fatty acids in bacteria. The cis-9, trans-11 CLA was 8.6-times greater in the protozoal fraction (1.32% of total fatty acids) than in the bacterial fraction (0.15%). These results suggest that the presence of protozoa in the rumen may increase the supply of CLA and other unsaturated fatty acids for lower gut absorption by ruminants. 相似文献
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动物维持正常的酸碱平衡,是发挥机体细胞整体功能效应的必要前提。当某种酶活性对微小ｐＨ值变化敏感时,许多中间代谢产物反应,调控着动物细胞酸碱平衡。酸碱平衡是氢离子浓度的一种功能。当难于测定细胞内液和亚细胞内ｐＨ变化时,一般测定细胞外液中氢离子浓度,大多数哺乳动物细胞外液氢离子浓度维持在低水平状态(40×10-9ｍｏｌ/Ｌ或40ｎＥｑ/Ｌ,ｐＨ74)。细胞内液氢离子浓度比细胞外液高,哺乳动物肌肉细胞胞液ｐＨ值67～71变化,这种差异是维持细胞内代谢产物浓度的重要因子。但在细胞内,亚细胞器与胞液间也存在氢离子浓度差异。线粒体内… 相似文献
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Ying‐Chao Zhang Dong‐Xia Li Xue‐Kai Wang Yan‐Li Lin Qing Zhang Xiao‐Yang Chen Fu‐Yu Yang 《Animal Science Journal》2019,90(4):513-522
The objective of this study was to examine the fermentation quality and aerobic stability of mulberry (Morus alba L.) silage prepared with lactic acid bacteria (LAB) and propionic acid (PA). The selected LAB strains Lactobacillus (L.) plantarum LC365281 (L1) and L. brevis LC365282 (L2), and commercial inoculant strains L. plantarum Gaofuji (GF) and L. buchneri Fresh (FR), and PA were used as additives for silage preparation. Silage treatments were designed as control, L1, L2, GF, FR, PA, PA + L1, PA + L2, PA + GF, or PA + FR. After 30 days of ensiling, the fermentation quality of silages treated with PA + L1 was improved, with a lower (p < 0.05) pH and NH3‐N content than those of other treatments. During the aerobic exposure, the PA + LAB‐treated silages displayed an aerobic stability with stable pH value and lactic acid content. The results confirm that L. plantarum L1 and PA were the best additive combination for ensiling mulberry. 相似文献
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K L Campbell 《Veterinary Clinics of North America: Small Animal Practice》1990,20(6):1475-1486
The importance of dietary fatty acids to the health of the skin was recognized more than 60 years ago. Fatty acids are important in providing membrane fluidity and maintaining the cutaneous water permeability barrier. Fatty acids function as precursors of eicosanoids. Eicosanoids, which include prostaglandins and leukotrienes, influence cellular interactions, cellular proliferation, and inflammation. Certain diseases, such as atopy and hypothyroidism, are characterized by abnormalities in fatty acid metabolism. Dietary manipulations may be useful in the treatment of diseases mediated by eicosanoids. 相似文献
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猪源乳酸菌的分离、筛选、鉴定及产酸性能的研究 总被引：3，自引：0，他引：3
试验旨在分离、筛选出具有强抗逆性、产酸能力强的同源菌株。从28日龄断奶健康仔猪粪便分离得到30株乳酸菌,应用体外筛选法,筛选出在pH值2.5处理2h后的菌株13株;将此13株菌株通过浓度为0.2%胆盐后剩7株。采用牛津杯法进行抑菌试验,从7株菌中筛选出对大肠杆菌、沙门氏菌有较强抑菌作用的4株,分别为R11、R15、R18、R22,对此4株菌株进行产酸试验验证,都表现出强的产酸能力。对这4株菌进行鉴定性试验,结果R11为屎肠球菌,R15为鸡肠球菌,R18为嗜酸乳杆菌,R22为口乳杆菌。 相似文献
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在肉鸭养殖过程中 ,种雏鸭烟酸和泛酸缺乏所致的瘫症 ,在某些地区发病率很高。我们对河南省的许昌、禹州等县市的 1 97家种鸭户进行调查 ,仅2 0 0 2年 3月到 2 0 0 2年 5月就有 1 9户近 2万只种蛋雏鸭患有此病 ,死亡约 30 0 0余只 ,5 0 0 0余只留有严重的后遗症。平均发病率 1 0 %左右 ,病死率 1 5 %左右 ,留有后遗症的占发病总数的 2 5 %左右。其他也有轻重不同的生产力下降问题。治疗重在相应物质的补充 ,但还是有大批量的病鸭留有后遗症。对此 ,我们使用中药成方独活寄生汤加减进一步治疗 ,收到明显效果。介绍如下1 材料与方法1 .1 试… 相似文献
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烟酸的作用与需要量 总被引：4，自引：0，他引：4
1 烟酸的结构和理化特性烟酸是具有生物学活性的吡啶 - 3 -羧酸及其衍生物的总称 ,烟酰胺是它在动物体内的主要存在形式。烟酸的化学结构简单 ,理化性质稳定 ,不易被酸、碱、热破坏 ,预混料中的烟酸在 5℃、2 5℃和 3 5℃下贮存 2 4个月后 ,保存率均达 99% ,因而被认为是最稳定的维生素。2 饲料中的烟酸动物需要的烟酸有 4个基本来源 :天然饲料、动物特别是反刍动物瘤胃微生物合成、体内色氨酸转化及额外添加化学合成的烟酸。烟酸广泛分布于谷物籽实等天然饲料原料中 ,但不同植物品种中烟酸含量有很大差异 ,同一饲料由于受收获季节及加工… 相似文献
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赖文清 《国外畜牧学(猪与禽)》2004,24(2):19-21
叶酸也称为蝶酰谷氨酸,由三个基本部分构成：一个蝶啶内核,一个对氨基苯甲酸残基,以及一个谷氨酸分子;其生物学活性形式即为叶酸。天然叶酸是一种结合体,存在于每一个活细胞中,并存在于豆类中以及小麦的胚芽中。通常用于商品禽饲料的饲料原料不能提供足够量的叶酸来满足全部的营养需 相似文献
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K. Eder 《Journal of animal physiology and animal nutrition》1999,81(3):141-149
In laboratory animals, dietary cholesterol has been shown to cause increased levels of lipids in plasma and liver, and additionally markedly raises liver weights (Lee and Ho 1975; Huang et al. 1984; Stangl et al. 1994). In poultry, similar studies dealing with the effects of cholesterol are lacking. An effect of cholesterol on liver weights could be of particular interest in geese since the production of fatty livers ('Foie gras') by force-feeding techniques is common in some countries. Therefore, a previous study (Eder 1999) was concerned with the effects of feeding cholesterol on concentrations of various lipids in liver, plasma and muscle. This study demonstrated that dietary cholesterol has profound effects on lipid concentrations in liver, plasma and even in the muscle of geese which were additionally amplified by feeding cholic acid. This study was performed to investigate whether an accumulation of cholesterol in tissues also affects the metabolism of fatty acids. This question was of particular interest because it is known that both, cholesterol and fatty acids are constituents of membranes influencing important membrane properties such as fluidity, permeability or the activity of membrane-bound enzymes (Stubbs and Smith 1984). In order to clarify that question, the fatty acid composition was analysed in various tissues of geese that had been fed diets with cholesterol and/or cholic acid. 相似文献