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采用正交试验法研究了产速康口服液的制备工艺,对挥发油的提取时间,水提取工艺中的加水量、浸泡时间、煎煮时间、煎煮次数,乙醇沉淀中的乙醇用量进行了筛选.确定的最佳制备工艺为:挥发油提取时间6 h;水提工艺每次加水12倍量、浸泡1 h、煎煮0.5 h、煎3次,2倍量乙醇除杂质. 相似文献
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探索了一条简便制备SOD的工艺路线。通过60℃热变性、氯仿—乙醇沉淀和丙酮沉淀。结果从猪血红细胞中提取的SOD的比活达3400U·mg-1,总回收率为72%。该工艺操作简单,所需的仪器设备少,易于调控,适宜工业化生产。 相似文献
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猪胰脂肪酶制备工艺研究 总被引：2，自引：0，他引：2
以猪胰脏为原料生产高纯度的胰脂肪酶。利用有机溶液提取、沉淀蛋白,再利用盐析和凝胶层析分离纯化蛋白,采用真空低温冻干获得猪胰脂肪酶。制备的胰脂肪酶活性为266ku/g,收率为18%。该工艺简单,提取效率好,酶活性高。 相似文献
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优化清解合剂的提取工艺,充分提取药物中的有效成分。采用单因素试验确定不同因素对提取工艺的影响以及正交试验的因素与水平;用高效液相色谱检测黄芩苷的含量,以黄芩苷含量和干膏得率为综合评价指标,采用加权评分法进行综合评分,筛选出清解合剂的最佳提取工艺。结果表明,最优提取工艺为料液比1∶15(g∶mL),提取时间1 h,提取次数2次,黄芩苷的线性回归方程为y=37 499x-112 622(R2=0.999 6),黄芩苷对照品质量浓度在7.81～500.00μg/mL范围内呈现良好的线性关系。表明优选的提取工艺稳定可行,为规模化生产提供一定的理论依据。 相似文献
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微波法从玉米皮中提取肌醇的条件研究 总被引：1，自引：0，他引：1
采用正交试验,以玉米皮为原料,研究了微波制备肌醇的最佳工艺条件,并采用高效液相色谱法对肌醇的含量进行了测定.结果表明,最佳制备的工艺条件为提取功率500 W,提取温度70℃,反应时间为9 min,肌醇得率为1.5024%. 相似文献
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建立了测定普抗合剂中黄芩苷含量的反相高效液相色谱法。采用Symmetry C18分析柱(150 mm×4.6 mm,5μm);流动相为甲醇-0.006%磷酸(50∶50);流速1.0 mL/m in;色谱柱温度25℃;检测波长278 nm;进样体积10μL;外标法计算含量。结果表明,黄芩苷进样量在0.412~4.12μg范围内,其色谱峰面积与进样量间有良好的线性关系,r=0.999 5,n=5,回收率为99.48%,RSD=1.07%(n=5)。该方法可用于控制普抗合剂中黄芩苷含量。 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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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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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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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