共查询到19条相似文献,搜索用时 140 毫秒
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本文探讨了以粗蜂胶为原料,研制蜂胶冻干粉的的工艺。结果表明:蜂胶冻干粉的工艺流程为粗蜂胶—→醇溶法提取—→赋形—→冻干—→冻干粉。最佳工艺条件为:(1)醇溶法提取蜂胶的最佳条件:固液比:1:25,乙醇溶液浓度75%,提取温度80℃,提取时间1.5h。(2)赋形剂为22%甘露醇,赋形的最佳条件为:22%甘露醇与4%的蜂胶乙醇溶液按76:24的比例混合。(3)冻干条件:预冻温度-74℃,预冻时间2小时,抽真空时间24小时,升温干燥20℃,升温干燥30分钟,冷阱温度为-52℃。在此条件下生产的蜂胶冻干粉的溶解度为87%,水分含量为0.93,总黄酮含量为0.49%。 相似文献
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目的:建立注射用醋酸去氨加压素的最佳制备工艺。方法:采用真空冷冻干燥法,对注射用醋酸去氨加压素的工艺条件,如药液装量、预冻温度、升华干燥温度、解吸干燥温度等进行考察。结果:最佳制备工艺为药液装量0.8 m L/瓶,选取-40℃为本产品预冻温度,在真空状态下,以-40~-25℃进行升华干燥,在35℃下进行解吸干燥。结论:经验证,该注射用醋酸去氨加压素制备工艺适合批量生产,产品质量符合国家标准规定。 相似文献
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卵磷脂提取工艺的研究 总被引:4,自引:0,他引:4
研究建立了以新疆本地植物油脚为原料的卵磷脂提取工艺.水化油脚在0.065-0.085MPa、80℃条件下真空浓缩脱水,得浓缩磷脂,再经丙酮脱油、分离、干燥得粉状磷脂即粗磷脂;粗磷脂在55℃、30MPa条件下用超临界流体二氧化碳萃取2小时萃除油脂等杂质,纯化得磷脂;然后用三倍量85%的乙醇60℃下提取磷脂1小时,提取三次,最终得到以磷脂酰胆碱为主的产品即卵磷脂.大豆、葵花和胡麻三种卵磷脂的提取率分别为17.8%、12.6%及13.2%,含磷量分别为4.52%、2.93%及3.28%,磷脂酰胆碱含量分别为64.3%、53.3%及59.8%. 相似文献
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QPQ技术的工艺,渗层形貌及影响因素:QPQ盐浴复合处理技术之三 总被引:1,自引:0,他引:1
1.基本工艺过程 QPQ盐浴复合处理技术的主要工序有: 预热:350~400℃ 20~40min 渗氮:520~580℃ 10~180min 氧化:350~400℃ 15~20min 工艺过程为:装卡→去油清洗→预热→渗氮→氧化→去盐清洗→干燥→浸油。 各主要工序的基本作用为: 预热:预热的主要作用是烤干工件表面的水分,使冷工件升温后再入渗氮炉,以防带水工件入 相似文献
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《机电信息》2016,(35)
目的:优化奥硝唑冻干粉针的成型制备工艺。方法:选择甘露醇用量、活性炭用量、p H值为考察因素,以冻干粉针的外观评分、含量检测为考察指标,采用L9(34)正交试验优选奥硝唑冻干粉针的制备工艺。结果:按优选的最佳制备工艺,即甘露醇用量0.8%(g/m L)、活性炭用量0.05%(g/m L)、p H值4.0(±0.5)所制备的奥硝唑冻干粉针产品外形呈白色块状物、表面细腻、疏松饱满、成型性好,加水溶解后的药液澄清、复溶性好。结论:优选的奥硝唑冻干粉针制备工艺合理,产品的性状、鉴别、酸度、有关物质、水分、不溶性微粒、可见异物、细菌内毒素、无菌检查、p H值、含量测定等质量属性检查均符合标准,表明该方法重现性好,可用于奥硝唑冻干粉针的生产。 相似文献
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香叶中挥发性组分的超临界萃取及气相色谱-质谱分析 总被引:4,自引:0,他引:4
用正交试验法研究超临界萃取香叶挥发性成分的条件,并用气相色谱-质谱联用技术分析了香叶挥发油的化学成分。结果显示萃取条件按对结果影响大小依次排列为:萃取压力、萃取温度、萃取时间,最佳萃取条件为萃取压力30 MPa、萃取温度40 ℃、萃取时间1 h。挥发油收率为2.6%,从中确认出47种化学成分,而用同时水蒸气蒸馏 溶剂萃取方法收率仅为0.8%,仅确认出30种挥发性成分。 相似文献
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10-hydroxycamptothecin,camptothecin analogue,is an antitumor agent that targets the nuclear enzyme topoisomerase I. 10-hydroxycamptothecin is injected by sodium salt form in clinic, and myelosuppression is the major toxicity. To enhance water solubility and reduce the toxicity, lipid nanoparticle which is water-soluble was designed. The quantitative analyses of liposomal and total 10-hydroxycamptothecin in dog plasma were developed and validated by liquid chromatographic-tandem mass spectrometry(LC-MS/MS). Two preparation procedures were developed to separate liposomal 10-hydroxycamptothecin, one was solid phase extraction, the other was liquid-liquid extraction. The analyte and internal standand(camptothecin) were separated on a Zorbax SB-C18 column using the mobile phase consisting of V(acetonitrile):V(water):V(formic acid)=70:30:0.2. Electropray ionization source of MS was applied and operated in positive ion mode. The peak area of the m/z 365→321 transition of 10-hydroxycamptothecin and that of m/z 349→305 transition of the IS were measured. The linear calibration curve for liposmal 10-hydroxycamptothecin is obtained in the concentration range of 1.00- 1 000μg L-1, and that for total 10-hydroxycamptothecin is obtained in the concentration range of 1.00- 2 000μg L-1. The recoveries of solid phase extraction and liquid-liquid extraction methods are 48.1%-52.4% and 79.6%-83.0%, respectively. This validated LC-MS/MS assay is successfully applied to pharmacokinetic study of 10-hydroxycamptothecin loaded lipid nanoparticle in dogs after administration single dosages of 0.5, 1, 2 mg kg-1 and multiple dosage of 1.0 mg kg-1 d-1 10-hydroxycamptothecin lipid nanoparticle. 相似文献
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目的:采用黑曲霉(Aspergillus niger)孢子悬液发酵淫羊藿,观察其对淫羊藿苷的影响,建立淫羊藿苷的检测方法。方法:淫羊藿在30℃、孢子浓度1.8×104/mL条件下固态预发酵7d。用水回流法、乙醇回流法、超声水提法、超声醇提法从淫羊藿中提取淫羊藿苷,HPLC法测定其含量。结论:发酵淫羊藿的色谱条件为:DiamonsilC18(250×4.6mm,5μm);流动相:甲醇-水-冰醋酸(60:40:0.25);检测波长:270nm;柱温:41℃;流速:1.0min/mL。发酵前后超声醇提法均优于其它方法,淫羊藿苷含量最高(5.06%、2.38%),水回流法(0.87、0.87%)、乙醇回流法(4.44、2.13%)、超声水提法(1.11、1.34%)发酵后淫羊藿苷含量发生变化,本研究为淫羊藿储藏期质量评价奠定基础。 相似文献
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A simple method for the analysis of capsaicin and dihydrocapsaicin in peppers by ultrasound assisted extraction (USAE) followed by gas chromatography–mass spectrometry (GC-MS) has been developed. USAE conditions were optimized by experimental design in order to maximize analyte extraction. A full factorial design involving extraction variables such as solvent (ethanol and water), extraction time (5–25 min), extraction temperature (25–50 °C), sample amount (0.25–0.5 g), and ultrasound amplitude (40–80%) was applied. The most significant conditions for capsaicinoid extraction by USAE were solvent type, extraction time, and sample amount. The obtained results were compared with other extraction methods: the official Soxhlet method and a previously reported solid phase microextraction method. Results showed that the extraction efficiency with the application of USAE (98%) was as good as that obtained with Soxhlet and the precision of recovery was less than 5%; in addition, the extraction time was decreased from 5 h to 25 min. The GC-MS analytical method was linear in the range 10–100 μg/mL for capsaicin and dihydrocpsaicin with correlation coefficient r = 0.998 and peak area variability of ~1% for both capsaicinoids. The method was applied to the analysis of 11 varieties of hot peppers cultivated in México. A large concentration range for capsaicin (101–6800 μg/g) and dihydrocapsaicin (110–2736 μg/g) was found in these pepper samples. 相似文献
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本文研究了铬(Ⅵ)—二苯偶氮羰酰肼(DPCO)—聚乙二醇(PEG)体系的萃取和显色反应条件。在pH值为2.0的盐酸-氯化钾缓冲体系中,采用萃取分光光度法,直接测定了油样中的铬(Ⅵ)。铬(Ⅵ)的最大吸收峰位于550nm处,铬(Ⅵ)含量在0~25μg/10mL范围内服从比尔定律。摩尔吸光系数ε550=1.9×105L·mol-1·cm-1,相关系数r=0.9996。实验结果表明:人工合成样的平均回收率为97.73%,相对标准偏差(RSD)为3.19%。采用该方法测定了阿曼原油和减二线油中的铬(Ⅵ),其含量分别为1.164μg·g-1和3.432μg·g-1,它们的相对标准偏差(RSD)分别为1.77%和2.16%。阿曼原油和减二线油中铬(Ⅵ)的加标平均回收率分别为97.80%和99.82%。研究结果表明,该方法具有操作简便、灵敏度较高、对环境无污染等特点,是集萃取和显色为一体的测定油样中铬(Ⅵ)的好方法。 相似文献
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为了最大程度上获取短乳杆菌49(Lactobacillus brevis 49)的蛋白质信息,分别优化了蛋白质的提取条件与酶解条件。用正交实验法考察细胞破碎方法、蛋白酶种类、酶解时间、酶添加量4个因素对 L. brevis 49的胞内蛋白提取方法以及酶解方法的影响,以质谱中检测到的蛋白质数目为参考指标进行优化;同时对培养基氮源进行优化,并分别选用TCA沉淀法、冷丙酮沉淀法、平衡酚 丙酮法和超滤法提取发酵液中的胞外蛋白。结果表明:L. brevis 49胞内蛋白最佳的提取破壁方法为超声破碎法,最佳水解酶为糜蛋白酶和胰蛋白酶共同作用,最佳的酶与蛋白质量比为 1∶50,最佳酶解时间为12 h,获得胞内蛋白数目527个。获得L. brevis 49胞外蛋白的最佳培养基为0.6%酵母浸粉做单一氮源的MRS培养基,最佳提取方法为三氯乙酸(TCA)法,可获得44个含信号肽蛋白。该方法有望为啤酒的安全检测提供参考。 相似文献