24小时热门版块排行榜    

查看: 896  |  回复: 6

yufu0522

木虫 (正式写手)


[交流] 翻译美国药典拉米夫定

Identification—
A: Infrared Absorption 197M.
B: The retention time of the major peak in the chromatogram of the Test solution corresponds to that in the chromatogram of the Resolution solution, as obtained in the test for Limit of lamivudine enantiomer.
Light absorption— Its absorptivity (see Spectrophotometry and Light-Scattering 851) at 440 nm, determined in 4-cm cells with a 50 mg per mL solution in water, is not more than 0.0015.
Water, Method Ic 921: not more than 0.2%.
Limit of lamivudine enantiomer—
0.1 M Ammonium acetate solution— Dissolve about 7.7 g of ammonium acetate in water, and dilute with water to 1000 mL.
Mobile phase— Prepare a suitable mixture of 0.1 M Ammonium acetate solution and methanol (95:5), mix, filter, and degas.
Resolution solution— Dissolve an accurately weighed quantity of USP Lamivudine Resolution Mixture A RS in water to obtain a solution having a known concentration of about 0.25 mg per mL.
Test solution— Transfer about 25 mg of Lamivudine, accurately weighed, to a 100-mL volumetric flask, dissolve in and dilute with water to volume, and mix.
Chromatographic system (see Chromatography 621)— The liquid chromatograph is equipped with a 270-nm detector and a 4.6-mm × 25-cm column that contains packing L45. The column temperature is maintained at a constant temperature of between 15 and 30. The flow rate is about 1.0 mL per minute. Chromatograph the Resolution solution, and record the peak responses as directed for Procedure: the resolution, R, between lamivudine and lamivudine enantiomer is not less than 1.5. [note—The relative retention times are about 1.0 for lamivudine and about 1.2 for lamivudine enantiomer.]
Procedure— Inject a volume (about 10 µL) of the Test solution into the chromatograph, record the chromatogram, and measure the responses for the major peaks. Calculate the percentage of lamivudine enantiomer in the portion of Lamivudine taken by the formula:
100[rU /(rU + rS)]
in which rU and rS are the peak responses of lamivudine enantiomer and lamivudine, respectively: not more than 0.3% is found.
Limit of residual solvents—
Internal standard solution— Transfer about 1 mL of 2-pentanone, accurately measured, to a 100-mL volumetric flask, dilute with a mixture of dimethyl sulfoxide and water (1:1) to volume, and mix.
Standard solution— Transfer 10 mL of Internal standard solution to a 100-mL volumetric flask. To the same flask add an accurately measured quantity of about 100 µL of each of the following: dehydrated alcohol, isopropyl acetate, methanol, and triethylamine. Dilute with a mixture of dimethyl sulfoxide and water (1:1) to volume, and mix.
Test solution— Transfer about 5 g of Lamivudine, accurately weighed, to a 100-mL volumetric flask, add 10 mL of Internal standard solution, dilute with a mixture of dimethyl sulfoxide and water (1:1) to volume, and mix.
Chromatographic system (see Chromatography 621)— The gas chromatograph is equipped with a split injection port, a flame-ionization detector, and a 0.53-mm × 50-m column coated with a 5-µm film of phase G1. The carrier gas is hydrogen at a pressure of 5 psig. The split flow rate is about 320 mL per minute. The chromatograph is programmed as follows. Initially the temperature of the column is maintained at 70 for 3 minutes, then increased at a rate of 30 per minute to 200, and maintained at that temperature for 6.5 minutes. The injection port temperature is maintained at 150 and the detector temperature is maintained at 250.
Procedure— Separately inject equal volumes (about 0.5 µL) of the Standard solution and the Test solution into the chromatograph, record the chromatograms, and measure the peak areas. Calculate the percentage of each residual solvent in the portion of Lamivudine taken by the formula:
10(C/W)(RU / RS)
in which C is the concentration, in mg per mL, of the respective analyte in the Standard solution; W is the weight, in g, of Lamivudine taken; and RU and RS are the peak response ratios of the respective analyte to the internal standard obtained from the Test solution and the Standard solution, respectively: not more than 0.2% of alcohol is found; not more than 0.2% of isopropyl acetate is found; not more than 0.1% of methanol is found; not more than 0.1% of triethylamine is found; and not more than 0.3% of total residual solvents is found.
Chromatographic purity—
0.025 M Ammonium acetate solution, Mobile phase, System suitability solution, and Chromatographic system— Proceed as directed in the Assay.
Salicylic acid solution— Dissolve an accurately weighed quantity of salicylic acid in Mobile phase, and dilute quantitatively, and stepwise if necessary, with Mobile phase to obtain a solution having a concentration of about 0.625 µg per mL.
Standard solution— Use the Standard preparation, prepared as directed in the Assay.
Test solution— Use the Assay preparation.
Procedure— Separately inject equal volumes (about 10 µL) of Salicylic acid solution and the Test solution into the chromatograph, record the chromatograms, and measure all the peak responses. Calculate the percentage of salicylic acid in the portion of Lamivudine taken by the formula:
(10C/W)(rU / rS)
in which C is the concentration, in µg per mL, of salicylic acid in the Salicylic acid solution; W is the weight, in mg, of Lamivudine taken for the Test solution; and rU and rS are the salicylic acid peak responses obtained from the Test solution and the Salicylic acid solution, respectively. Calculate the percentage of other individual impurities in the portion of Lamivudine taken by the formula:
100(ri / rs)
in which ri is the peak response for each impurity other than salicylic acid obtained from the Test solution; and rs is the sum of the responses for all the peaks: not more than 0.3% for any peak at a relative retention time of about 0.4 is found; not more than 0.2% for any peak at a relative retention time of about 0.9 is found; not more than 0.1% of salicylic acid is found; not more than 0.1% of any other individual impurity is found; and not more than 0.6% of total impurities is found.
Assay—
0.025 M Ammonium acetate solution— Transfer about 1.9 g of ammonium acetate to a 1000-mL volumetric flask, dissolve in about 900 mL of water, adjust with acetic acid to a pH of 3.8 ± 0.2, dilute with water to volume, and mix.
Mobile phase— Prepare a filtered and degassed mixture of 0.025 M Ammonium acetate solution and methanol (95:5). Make adjustments if necessary (see System Suitability under Chromatography 621).
System suitability solution— Dissolve an accurately weighed quantity of USP Lamivudine Resolution Mixture B RS in Mobile phase to obtain a solution having a known concentration of about 0.25 mg per mL.
Standard preparation— Dissolve an accurately weighed quantity of USP Lamivudine RS in Mobile phase, and dilute quantitatively, and stepwise if necessary, with Mobile phase to obtain a solution having a known concentration of about 0.25 mg per mL.
Assay preparation— Transfer about 25 mg of Lamivudine, accurately weighed, to a 100-mL volumetric flask, dissolve in and dilute with Mobile phase to volume, and mix.
Chromatographic system (see Chromatography 621)— The liquid chromatograph is equipped with a 277-nm detector and a 4.6-mm × 25-cm column that contains packing L1. The flow rate is about 1.0 mL per minute. The column temperature is maintained at 35. Chromatograph the System suitability solution, and record the peak responses as directed for Procedure: the resolution, R, between lamivudine and lamivudine diastereomer is not less than 1.5. [note—The relative retention times are about 1.0 for lamivudine and 0.9 for lamivudine diastereomer.] Chromatograph the Standard preparation, and record the peak responses as directed for Procedure: the relative standard deviation for replicate injections is not more than 2.0%.
Procedure— Separately inject equal volumes (about 10 µL) of the Standard preparation and the Assay preparation into the chromatograph, record the chromatograms, and measure the responses for the lamivudine peaks. Calculate the quantity, in mg, of C8H11N3O3S in the portion of Lamivudine taken by the formula:
100C(rU / rS)
in which C is the concentration, in mg per mL, of USP Lamivudine RS in the Standard preparation; and rU and rS are the peak responses obtained from the Assay preparation and the Standard preparation, respectively.
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Behnam Davani, Ph.D., M.B.A.
Senior Scientist
1-301-816-8394 (MDAA05) Monograph Development-Antivirals and Antimicrobials
Reference Standards Lili Wang, Technical Services Scientist
1-301-816-8129

» 猜你喜欢

» 抢金币啦!回帖就可以得到:

查看全部散金贴

已阅   关注TA 给TA发消息 送TA红花 TA的回帖

pulllantern

木虫 (小有名气)


yufu0522(金币+1, 翻译EPI+1): 2010-12-23 23:06:00
ringzhu(翻译EPI-1):发放错误~~~ 2010-12-27 10:55:43
很好很强大。
2楼2010-12-23 10:58:06
已阅   关注TA 给TA发消息 送TA红花 TA的回帖

yufu0522

木虫 (正式写手)


高手啊,出手吧!
3楼2010-12-23 23:05:48
已阅   关注TA 给TA发消息 送TA红花 TA的回帖

yufu0522

木虫 (正式写手)


唉 金币发错了!
4楼2010-12-23 23:07:18
已阅   关注TA 给TA发消息 送TA红花 TA的回帖

yufu0522

木虫 (正式写手)


金币有加了20个,
请高手帮忙!
5楼2010-12-28 09:36:21
已阅   关注TA 给TA发消息 送TA红花 TA的回帖

gfbrjmk

木虫 (正式写手)


★ ★
ringzhu(金币+2):哈哈 元旦快乐~~· 2011-01-01 13:39:49
小抠, 大抠, 特抠
鉴定完毕
6楼2010-12-29 20:33:49
已阅   关注TA 给TA发消息 送TA红花 TA的回帖

pulllantern

木虫 (小有名气)


引用回帖:
Originally posted by yufu0522 at 2010-12-23 23:07:18:
唉 金币发错了!

我不要,版主扣了我的还楼主好了。
7楼2010-12-31 14:06:18
已阅   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 yufu0522 的主题更新
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 考研求调剂 +3 橘颂. 2026-03-17 4/200 2026-03-17 21:43 by 有只狸奴
[考研] 材料专硕306英一数二 +7 z1z2z3879 2026-03-16 9/450 2026-03-17 17:31 by ccjequ
[考研] 304求调剂 +8 小熊joy 2026-03-14 8/400 2026-03-17 17:29 by ruiyingmiao
[考研] 308求调剂 +4 是Lupa啊 2026-03-16 4/200 2026-03-17 17:12 by ruiyingmiao
[考研] 一志愿苏州大学材料工程(085601)专硕有科研经历三项国奖两个实用型专利一项省级立项 +6 大火山小火山 2026-03-16 8/400 2026-03-17 15:05 by 无懈可击111
[考研] 290求调剂 +6 孔志浩 2026-03-12 11/550 2026-03-17 14:41 by 周舟舟77
[考研] 工科材料085601 279求调剂 +3 困于星晨 2026-03-17 3/150 2026-03-17 14:08 by ms629
[考研] 一志愿985,本科211,0817化学工程与技术319求调剂 +5 Liwangman 2026-03-15 5/250 2026-03-16 17:10 by 我的船我的海
[考研] 一志愿211 0703方向310分求调剂 +3 努力奋斗112 2026-03-15 3/150 2026-03-16 16:44 by houyaoxu
[考研] 0703化学调剂 +6 妮妮ninicgb 2026-03-15 9/450 2026-03-16 16:40 by houyaoxu
[考研] 070300化学学硕求调剂 +6 太想进步了0608 2026-03-16 6/300 2026-03-16 16:13 by kykm678
[考研] 0856专硕279求调剂 +5 加油加油!? 2026-03-15 5/250 2026-03-15 11:58 by 2020015
[考研] 328求调剂 +3 5201314Lsy! 2026-03-13 6/300 2026-03-14 15:31 by hyswxzs
[考研] 331求调剂(0703有机化学 +5 ZY-05 2026-03-13 6/300 2026-03-14 10:51 by Jy?
[考研] 330求调剂 +3 ?酱给调剂跪了 2026-03-13 3/150 2026-03-14 10:13 by JourneyLucky
[考研] 279求调剂 +3 Dizzy123@ 2026-03-10 3/150 2026-03-13 23:02 by JourneyLucky
[考研] 304求调剂 +6 Mochaaaa 2026-03-12 7/350 2026-03-13 22:18 by 星空星月
[考研] 336求调剂 +6 Iuruoh 2026-03-11 6/300 2026-03-13 22:06 by JourneyLucky
[考研] 求材料调剂 +5 隔壁陈先生 2026-03-12 5/250 2026-03-13 22:03 by 星空星月
[考研] 0703化学求调剂 +7 绿豆芹菜汤 2026-03-12 7/350 2026-03-13 17:25 by njzyff
信息提示
请填处理意见