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建立一测多评( QAMS) 法同时测定淫羊藿提取物中4种黄酮类化合物的含量,并验证了该方法的准确性和可行性。采用C18色谱柱,乙腈-水为流动相,检测波长270 nm,建立朝藿定A、朝藿定B、朝藿定C与内标物淫羊藿苷的相对校正因子(RCF),比较分析QAMS法与外标法含量测定结果的差异性。结果显示,6批不同产地和批号的淫羊藿提取物中4种黄酮类成分采用一测多评法与外标法的实测值之间无显著性差异。 相似文献
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曾泽张华琦桂干北罗杰钱玺丞胡桂芬 《饲料研究》2023,(8):120-124
博落回是我国传统中药，其主要活性物质为异喹啉类生物碱，具有抗菌、抗炎、抗氧化和抗肿瘤等多种生物学功能，是一种潜在的抗生素替代品。文章主要介绍了博落回的主要活性成分（血根碱和白屈菜红碱）的特性，综述了博落回的抗菌、抗炎、抗氧化和抗肿瘤等生物学特性及其在动物生产中的应用，为博落回的进一步开发与应用提供参考。 相似文献
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建立同时测定白头翁口服液中3种生物碱成分含量的一测多评法。采用Agilent ZORBAX SB C_(18)(4.6 mm×250 mm,5μm)色谱柱分离,乙腈-0.05 mol/L磷酸二氢钾溶液(50∶50)(每100 mL中加十二烷基硫酸钠0.4 g,再以磷酸调节pH为4.0)为流动相,流速为1.0 mL/min,采用347 nm作为检测波长进行检测。以小檗碱为内参物,分别计算与黄连碱和巴马汀的相对校正因子及相对保留时间,实现一测多评。本研究拟为白头翁口服液质量控制提供新的思路。 相似文献
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高效毛细管电泳法在中药分析中的应用 总被引：1，自引：0，他引：1
简要介绍了高效毛细管电泳的六种主要分离模式及其在分析中药材的生物碱、黄酮、有机酸、香豆素类、醌类、苷类等成分和中药复方制剂中的应用，并分析了该技术的发展前景。 相似文献
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博落回[Macleaya cordata (willd.) R.Br.]又名"号筒杆",是罂粟科博落回属的多年生草本植物。博落回富含生物碱资源,其主要功能活性成分为血根碱、白屈菜红碱、原阿片碱、别隐品碱等异喹啉类生物碱,具有抗微生物、抗炎、抗氧化、杀虫、抗病毒、抗肿瘤等多种生物学活性。文章通过对博落回主要功能成分血根碱、白屈菜红碱、原阿片碱、别隐品碱等异喹啉类生物碱的抗微生物、抗炎、抗氧化、改善肠道健康等生物学活性及其在动物生产中的应用进行综述,以期为博落回功能成分的开发和应用提供参考。 相似文献
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抑制鹿源多药耐药结核菌中药的筛选 总被引：1，自引：0，他引：1
为了筛选对鹿源多药耐药结核菌有效的中药耐药抑制剂,通过MABA法检测24种中药的水和乙醇提取物对多药耐药结核菌及标准菌H37Rv的体外抗菌效果,将筛选出的抗菌效果好的黄连醇提物和黄连水提物采用紫外分光光度法进行活性成分含量测定,同时以MABA法与标准品比较体外抗结核菌活性。结果显示,黄连、独活和侧柏叶有明显的抗结核活性,其中黄连水粗提物和乙醇粗提物效果最佳,测得它们活性成分即总生物碱含量分别为22.74%和35.23%,并显示二者与小檗碱的体外抗结核作用相同。 相似文献
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目前，中药提取的常规方法有煎煮法、水蒸馏法、溶剂浸提法等，其提取时间长，影响提出率。近年来，人们用超声波提取植物中的生物碱、俄类、生物活性物质、动物组织浆中的毒质等，都表明超声波在较短的时间内能得到比常规法提取物要多，主要的化学成分与常规法相比没有变化。本文简介了超声技术在杜仲叶药用成分（没膏粉、绿原酸）提取中的应用。1、超声波提高杜仲浸膏粉得率的研究对超声剂量＼超声波频率、浸泡时间、浸提温度与杜仲浸膏粉得率的关系进行了实验研究，以常规煎煮法提取杜仲叶浸膏粉为对照实验。2、超声波提高绿原酸得率的实… 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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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
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献
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Billinghurst RC Brama PA van Weeren PR Knowlton MS McIlwraith CW 《American journal of veterinary research》2004,65(2):143-150
OBJECTIVE: To determine whether serum concentrations of biomarkers of skeletal metabolism can, in conjunction with radiographic evaluation, indicate severity of osteochondrosis in developing horses. ANIMALS: 43 Dutch Warmblood foals with varying severity of osteochondrosis. PROCEDURE: 24 foals were monitored for 5 months and 19 foals were monitored for 11 months. Monthly radiographs of femoropatellar-femorotibial and tibio-tarsal joints were graded for osteochondral abnormalities. Serial blood samples were assayed for 8 cartilage and bone biomarkers. At the end of the monitoring period, foals were examined for macroscopic osteochondrosis lesions. RESULTS: Temporal relationships were evident between certain serum biomarkers and osteochondrosis severity in foals during their first year. Biomarkers of collagen degradation (collagenase-generated neoepitopes of type-II collagen fragments, type-I and -II collagen fragments [COL2-3/4C(short)], and cross-linked telopeptide fragments of type-I collagen) and bone mineralization (osteocalcin) were positive indicators of osteochondrosis severity at 5 months of age. In foals with lesions at 11 months of age, osteochondrosis severity correlated negatively with COL2-3/4C(short) and osteocalcin and positively with C-propeptide of type-II procollagen (CPII), a collagen synthesis marker. Radiographic grading of osteochondrosis lesions significantly correlated with macroscopic osteochondrosis severity score at both ages and was strongest when combined with osteocalcin at 5 months and CPII at 11 months. CONCLUSIONS AND CLINICAL RELEVANCE: The ability of serum biomarkers to indicate osteochondrosis severity appears to depend on stage of disease and is strengthened with radiography. In older foals with more permanent lesions, osteochondrosis severity is significantly related to biomarker concentrations of decreased bone formation and increased cartilage synthesis. 相似文献