| 5 | 1/1 | 返回列表 |
| 查看: 1754 | 回復: 6 | ||
| 當前只顯示滿足指定條件的回帖,點擊這里查看本話題的所有回帖 | ||
[求助]
美國藥典USP37中Ascorbyl Palmitate質(zhì)量標準 已有2人參與
|
||
| 如題,急求最新生效的USP37,我需要其中的Ascorbyl Palmitate專論的復印件或掃描件。謝謝了! |
銀蟲 (著名寫手)
銀蟲 (著名寫手)
|
Ascorbyl Palmitate (as kore' bil pal' mi tate). C22H38O7414.53 l-Ascorbic acid, 6-hexadecanoate; l-Ascorbic acid 6-palmitate [137-66-6]. DEFINITION Ascorbyl Palmitate contains NLT 95.0% and NMT 100.5% of C22H38O7, calculated on the dried basis. IDENTIFICATION • A. Procedure Sample solution: 40 mg/mL in alcohol Analysis: To 25 mL of Sample solution add 1 mL of a 1-in-1000 solution of 2,6-dichlorophenol-indophenol sodium in alcohol. Acceptance criteria: The blue color of the 2,6-dichlorophenol-indophenol sodium solution is discharged immediately. • B. Infrared Absorption 197K ASSAY • Procedure Sample solution: Dissolve 300 mg of Ascorbyl Palmitate in 50 mL of alcohol, and add 30 mL of water. Analysis: Immediately titrate the Sample solution with 0.1 N iodine VS to a yellow color that persists for NLT 30 s. Each mL of 0.1 N iodine is equivalent to 20.73 mg of C22H38O7. Acceptance criteria: 95.0%–100.5% on the dried basis IMPURITIES Inorganic Impurities • Residue on Ignition 281: NMT 0.1% • Heavy Metals, Method II231: NMT 10 ppm SPECIFIC TESTS • Melting Range or Temperature 741: 107–117 • Optical Rotation, Specific Rotation781S: +21 to +24 Sample solution: 100 mg/mL, in methanol • Loss on Drying 731: Dry a sample in vacuum at 60 for 1 h: it loses NMT 2.0% of its weight. ADDITIONAL REQUIREMENTS • Packaging and Storage: Preserve in tight containers, in a cool, dry place. • USP Reference Standards 11 USP Ascorbyl Palmitate RS Auxiliary Information— Please check for your question in the FAQs before contacting USP. Topic/Question Contact Expert Committee Monograph Galina Holloway, Ph.D. Scientific Liaison (301) 816-8133 (EXC2010) Monographs - Excipients Reference Standards RS Technical Services 1-301-816-8129 rstech@usp.org USP37–NF32 Page 5856 Pharmacopeial Forum: Volume No. 38(6) Chromatographic Column— ASCORBYL PALMITATE Chromatographic columns text is not derived from, and not part of, USP 37 or NF 32. |
金蟲 (初入文壇)
銀蟲 (著名寫手)
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 哈爾濱工業(yè)大學材料與化工專碩378求調(diào)劑 +3 | 塔比烏斯 2026-03-30 | 3/150 |
|
|---|---|---|---|---|
|
[考研] 抱歉 +4 | 田洪有 2026-03-30 | 4/200 |
|
|
[考研] 一志愿華中師范化學332分求調(diào)劑 +3 | Lyy930824@ 2026-03-29 | 3/150 |
|
|
[考研] 生物學 296 求調(diào)劑 +5 | 朵朵- 2026-03-26 | 7/350 |
|
|
[考研] 一志愿鄭州大學,080500學碩,總分317分求調(diào)劑 +10 | 舉個栗子oi 2026-03-24 | 11/550 |
|
|
[考研] 0703一志愿9,初試成績:338,四六級已過,有科研經(jīng)歷,求調(diào)劑! +7 | Zuhui0306 2026-03-25 | 7/350 |
|
|
[考研] 070305高分子化學與物理 304分求調(diào)劑 +12 | c297914 2026-03-28 | 12/600 |
|
|
[考研] 332求92調(diào)劑 +8 | 蕉蕉123 2026-03-28 | 8/400 |
|
|
[考研] 356求調(diào)劑 +4 | gysy?s?a 2026-03-28 | 4/200 |
|
|
[考研] 071000生物學求調(diào)劑,初試成績343 +7 | 小小甜面團 2026-03-25 | 7/350 |
|
|
[考研] 322求調(diào)劑 +5 | 舊吢 2026-03-24 | 5/250 |
|
|
[考研] 340求調(diào)劑 +5 | jhx777 2026-03-27 | 5/250 |
|
|
[考研] 275求調(diào)劑 +10 | jjjjjjjjjjl 2026-03-27 | 10/500 |
|
|
[考研] 070300化學求調(diào)劑 +4 | 起個名咋這么難 2026-03-27 | 4/200 |
|
|
[有機交流]
高溫高壓反應求助
10+4
|
chibby 2026-03-25 | 4/200 |
|
|
[考研] 一志愿211院校 344分 東北農(nóng)業(yè)大學生物學學碩,求調(diào)劑 +5 | 丶風雪夜歸人丶 2026-03-26 | 8/400 |
|
|
[考研] 085600,材料與化工321分,求調(diào)劑 +9 | 大饞小子 2026-03-27 | 9/450 |
|
|
[考研] 321求調(diào)劑 +6 | wasdssaa 2026-03-26 | 6/300 |
|
|
[考研] 中國科學院深圳先進技術研究院-光纖傳感課題組招生-中國科學院大學、深圳理工大學聯(lián)培 +5 | YangTyu1 2026-03-26 | 5/250 |
|
|
[考研]
|
平樂樂樂 2026-03-26 | 4/200 |
|