汉莲牌红曲灵芝丹参胶囊的配方论证及标志性 成分和功能学研究

目的对汉莲牌红曲灵芝丹参胶囊配方进行论证并对其标志性成分和功能学进行研究。方法依据中医理论和现代健康理念,对其配方进行论证,按照国家标准要求和相关规定,对其标志性成分进行鉴定,同时通过动物和人体试食试验来评价其功效。结果本品组分经典、科学合理,有效成分清楚、含量较高,每100 g中含洛伐他丁550 mg和丹参酮ⅡA 306 mg;动物和人体试食试验证明,各项指标均高于实验对照组,且差异显著(P0.01或P0.05),具有较为显著的辅助降血脂功能。结论本品在预防和早期干预血脂异常及相关疾病方面具有显著的优势和较为广阔的市场前景。     

Influence of temperature, [Ca2+], Ca/P ratio and ultrasonic power on the crystallinity and morphology of hydroxyapatite nanoparticles prepared with a novel ultrasonic precipitation method

Nanocrystalline hydroxyapatite was prepared by a precipitation method with the aid of ultrasonic irradiation using Ca(NO₃)₂ and NH₄H₂PO₄ as source material and carbamide (NH₂CONH₂) as precipitator. The influence of Ca/P molar ratio, precipitation temperature, concentration of Ca²⁺ ([Ca²⁺]) and ultrasonic power on the crystallinity of the nanopowder were systematically investigated by XRD analysis. The size of the as-prepared particles was analyzed using TEM and XRD methods. The results revealed that the monophase hydroxyapatite could be obtained at the following technological conditions: [Ca²⁺] = 0.01–0.1 mol/L, ultrasonic power = 300 W, Ca/P (mol) = 1.2–2.5 and T = 313–353 K. In addition, the acicular and spherical particles could be prepared at different ultrasonic powers of 300 and 200 W, respectively.     

气相色谱法测定粮食中有机氯农药残留的操作改进探讨

通过实验对GB/T 5009.19-2008《食品中有机氯农药多组分残留量的测定》中的第二法做了改进,方法是浓缩提取液时,水浴温度应设定为50℃;水分过高的样品,应通过无水硫酸钠过滤其提取液。同时,将色谱条件中要求的填充柱改进为DB-35石英毛细管柱,应用程序升温对样品进行分离,改进后8种有机氯的回收率在80.17%~100.2%之间,相对标准偏差为1.13%~3.56%,方法的灵敏度、回收率、重复性和分离效果都得到很大改善。