| 查看: 335 | 回复: 2 | |||
| 当前主题已经存档。 | |||
[交流]
【求助】美国药典头孢丙烯的的质量标准
|
|||
| 求助：美国药典头孢丙烯的的质量标准 |
回复此楼» 猜你喜欢
欢迎发来filecode的Mz6后的代码验证其规律
已经有56人回复
-
有时候，自然基金真的不能太认真 （我的申报经验）
已经有9人回复
-
售SCI文章，我:8O.5.5.1O.54,科目全,可十急
已经有3人回复
-
售一区SCI文章T0P，我:8O.551.O54,科目全,可十急
已经有3人回复
-
关于Filecode分析方法
已经有13人回复
-
时间戳又变了8-15
已经有9人回复
-
售SCI文章，我:8O5.5.1.O.54,科目齐全,可+急
已经有8人回复
-
售一区SCI文章T0P，我:8O.551.O54,科目全,可十急
已经有5人回复
-
售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急
已经有9人回复
-
哪位老哥知道今年的国自然具体哪一天放榜？
已经有6人回复
abitcom
金虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 663.2
- 散金: 1
- 帖子: 289
- 在线: 159.1小时
- 虫号: 45020
- 注册: 2004-05-08
- 性别: GG
- 专业: 药物资源
★ ★ ★
小木虫(金币+0.5):给个红包，谢谢回帖交流
狼狼晴空(金币+2):谢谢提供 2010-03-09 20:02
小木虫(金币+0.5):给个红包，谢谢回帖交流
狼狼晴空(金币+2):谢谢提供 2010-03-09 20:02
|
Cefprozil C18H19N3O5S·H2O 407.44 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-[[amino(4-hydroxyphenyl)acetyl]amino]-8-oxo-3-(1-propenyl)-, monohydrate, [6R-[6,7(R*)]]- (6R,7R)-7-[(R)-2-Amino-2-(p-hydroxyphenyl)acetamido]-8-oxo-3-propenyl-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid monohydrate [121123-17-9]. Anhydrous 389.43 [92665-29-7]. » Cefprozil contains not less than 900 µg and not more than 1050 µg of cefprozil (C18H19N3O5S) per mg, calculated on the anhydrous basis. Packaging and storage— Preserve in tight containers. USP Reference standards 11— USP Cefprozil (Z)-Isomer RS . USP Cefprozil (E)-Isomer RS . Identification— A: Infrared Absorption 197K— Standard specimen: USP Cefprozil (Z)-Isomer RS. B: The retention times of the cefprozil (Z)-isomer and cefprozil (E)-isomer peaks in the chromatogram of the Assay preparation correspond to those of the Standard preparations, as obtained in the Assay. Crystallinity 695: meets the requirements. pH 791: between 3.5 and 6.5, in a solution containing 5 mg per mL. Water, Method I 921: not less than 3.5% and not more than 6.5%. Cefprozil (E)-isomer ratio— Calculate the ratio of the cefprozil (E)-isomer to the total cefprozil taken by the formula: E / (E + Z) in which E is the content of cefprozil (E)-isomer, in µg per mg, as determined in the Assay, and Z is the content of cefprozil (Z)-isomer, in µg per mg, as determined in the Assay; the ratio is between 0.06 and 0.11. Assay— Mobile phase— Dissolve 20.7 g of monobasic ammonium phosphate in 1800 mL of water, and adjust, if necessary, with phosphoric acid to a pH of 4.4. Add 200 mL of acetonitrile, and mix. Filter this solution through a filter having a porosity of 0.5 µm or finer, and degas. Make adjustments if necessary (see System Suitability under Chromatography 621. [note—Decreasing the proportion of acetonitrile increases retention times and improves the separation of the cefprozil isomer peaks.] Standard cefprozil (Z)-isomer preparation—Dissolve an accurately weighed quantity of USP Cefprozil (Z)-Isomer RS. quantitatively in water to obtain a solution having a known concentration of about 0.25 mg per mL. [note—Use this solution within 6 hours.] Standard cefprozil (E)-isomer preparation—Dissolve an accurately weighed quantity of USP Cefprozil (E)-Isomer RS. quantitatively in water to obtain a stock solution having a known concentration of about 0.25 mg per mL. Transfer 5.0 mL of this stock solution to a 50-mL volumetric flask, dilute with water to volume, and mix. [note—Use this solution within 6 hours.] Resolution solution— Prepare a mixture of equal volumes of the Cefprozil (Z)-isomer standard preparation and of the stock solution used to prepare the Cefprozil (E)-isomer standard preparation.[note—Use this solution within 6 hours.] Assay preparation— Transfer about 15 mg of Cefprozil, accurately weighed, to a 50-mL volumetric flask, dilute with water to volume, and shake to assure dissolution. [note—Use this solution within 6 hours.] Chromatographic system (see Chromatography 621)—The liquid chromatograph is equipped with a 280-nm detector and a 3.9-mm × 25-cm column that contains 5-µm packing L1. The flow rate is about 1 mL per minute. Chromatograph the Resolution solution, and record the responses as directed under Procedure: the relative retention times are about 0.7 for cefprozil (Z)-isomer and 1.0 for cefprozil (E)-isomer, and the resolution, R, between the cefprozil (Z)-isomer peak and the cefprozil (E)-isomer peak is not less than 2.5. Chromatograph the Cefprozil (Z)-isomer standard preparation, and record the responses as directed under Procedure: the column efficiency, determined from the cefprozil (Z)-isomer peak, is not less than 2500 theoretical plates when calculated by the formula: 5.545(tr / Wh / 2)2 the tailing factor, determined from the cefprozil (Z)-isomer peak, is not less than 0.9 and not more than 1.1, when calculated by the formula: W0.1 / 2f in which W0.1 is the width of the peak at 10% height, and the relative standard deviation for replicate injections is not more than 2.0%. Procedure— Separately inject equal volumes (about 10 µL) of the Cefprozil (Z)-isomer standard preparation, the Cefprozil (E)-isomer standard preparation, and the Assay preparation into the chromatograph, record the chromatograms, and measure the areas for the major peaks. Calculate the quantity, in µg, of cefprozil (Z)-isomer and cefprozil (E)-isomer in each mg of the Cefprozil taken by the formula: 50(CP / M)(rU / rS) in which C is the concentration, in mg per mL, of USP Cefprozil (Z)-Isomer RS in the Cefprozil (Z)-isomer standard preparation or of the USP Cefprozil (E)-Isomer RS in the Cefprozil (E)-isomer standard preparation, as appropriate; P is the assigned potency, in µg per mg, of the appropriate USP Reference Standard; M is the quantity, in mg, of Cefprozil taken to prepare the Assay preparation; and rU and rS are the peak responses of the cefprozil (Z)-isomer or the cefprozil (E)-isomer, as appropriate, obtained from the Assay preparation and the relevant Standard preparation, respectively. Calculate the quantity, in µg, of cefprozil (C18H19N3O5S) in each mg of the Cefprozil taken by adding the values, in µg per mg, obtained for the cefprozil (Z)-isomer and for cefprozil (E)-isomer. Auxiliary Information— Please check for your question in the FAQs before contacting USP. Topic/Question Contact Expert Committee Monograph Ahalya Wise, M.S. Scientist 1-301-816-8161 (MDANT05) Monograph Development-Antibiotics Reference Standards Lili Wang, Technical Services Scientist 1-301-816-8129 RSTech@usp.org USP32–NF27 Page 1855 USP32–NF27 Supplement : No. 2 Page 4129 |
2楼2010-03-09 14:52:49
3楼2010-03-09 16:29:14
