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氨基酸微量元素螯合物的合成方法研究 总被引:4,自引:0,他引:4
以甘氨酸和金属硫酸盐为原料,通过调节pH值并加热使金属离子与氨基酸螯合,利用有机溶剂沉淀分离法制备了甘氨酸钢和甘氨酸锌螯合物,以螯合率为指标考察了影响合成工艺的主要因素,确定了最佳的投料摩尔比、pH值、反应时间和温度。用化学分析和红外光谱对螯合物进行了研究,确证了氨基酸螯合物的形成。 相似文献
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甲硫氨基酸螯合锌(Ⅱ)的合成与制备 总被引:1,自引:0,他引:1
本文介绍了高纯度甲硫氨基酸螯合锌(Ⅱ)内络盐的合成与制备方法。实验表明,获得螯合产物的最佳条件是:反应液的甲硫氨基酸浓度为3.5—4.5%,pH值为5.5。通过红外光谱分析和锌,甲硫氨基酸的摩尔七定量,论证了制得的螯合物为甲硫氨基酸螯合锌(Ⅱ)内络盐。 相似文献
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桑诚诚陶建军彭红星周长虹 《饲料研究》2023,(8):99-103
研究旨在得到一种晶型不同的甘氨酸锌螯合物。试验通过调节反应温度、pH值、原料的物质的量的比合成新型甘氨酸锌晶体,采用红外、元素分析及单晶X-射线衍射对合成得到的甘氨酸锌螯合物进行定性定量研究。结果显示,甘氨酸型为2∶1型,化学式为Zn(C2H4NO2)2·H2O,晶体为单斜晶系,空间群为c2/c,晶胞参数为a=17.567 (3)?,b=5.207 3 (16)?,c=9.829 9 (13)?,α=90°,β=121.072 (1)°,γ=90°,Z=4,V=770.205?3。锌与甘氨酸中的氮及氧配位形成四配位的五元螯合环,水不参与配位,为结晶水。研究表明,该单晶制备方法过程简单、无副产物,产物结构新颖、收率高。 相似文献
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氨基酸螯合锌是研究最早和应用最广泛的第三代锌添加剂,其优良的营养功能已有大量试验证实.与传统氨基酸锌螯合物制备工艺相比,采用微波固相合成法反应速度更快,并且产率高. 相似文献
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氨基酸螯合锌对动物生产性能和免疫功能的影响 总被引:1,自引:0,他引:1
1氨基酸螯合锌(Zn-AA)的定义根据美国饲料管理委员协会(AAFEO)(1996)的定义,金属氨基酸螯合物(Metal amino acid chelate)是由1~3mol蛋氨酸、赖氨酸或甘氨酸与1mol铁、锌、锰和铜等微量元素按比例经配位键形成的一类具有独特环状结构的螯合物,是一种类似动物体内吸收形式和生物 相似文献
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第三代微量元素饲料添加剂氨基酸微量元素螯合物是由氨基酸或短肽物质与微量元素通过化学方法螯合而成的一种新型饲料添加剂。研究表明 ,氨基酸微量元素螯合物作为饲料添加剂应用于畜禽饲料中 ,具有毒性小、易消化吸收、抗干扰、增重快和饲料报酬高等特点。目前已应用的产品主要有 :蛋氨酸铁、蛋氨酸锌、甘氨酸铁、蛋氨酸锰、蛋氨酸铜、蛋氨酸钴、赖氨酸锌、赖氨酸铜等。1 氨基酸微量元素螯合物的特性1 1 化学稳定性好 微量元素氨基酸螯合物是微量元素金属离子与氨基酸分子在一定工艺条件下反应形成的络合物。金属离子与氨基酸分子通过… 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献