Article(id=1222466390532023064, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1222466387184968430, articleNumber=null, orderNo=null, doi=10.16438/j.0513-4870.2018-0786, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1535299200000, receivedDateStr=2018-08-27, revisedDate=1540742400000, revisedDateStr=2018-10-29, acceptedDate=null, acceptedDateStr=null, onlineDate=1769388299830, onlineDateStr=2026-01-26, pubDate=1547222400000, pubDateStr=2019-01-12, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1769388299830, onlineIssueDateStr=2026-01-26, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1769388299830, creator=13701087609, updateTime=1769388299830, updator=13701087609, issue=Issue{id=1222466387184968430, tenantId=1146029695717560320, journalId=1189982191388893191, year='2019', volume='54', issue='1', pageStart='1', pageEnd='186', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1769388299030, creator=13701087609, updateTime=1769389216051, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1222470233521115434, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1222466387184968430, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1222470233521115435, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1222466387184968430, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=41, endPage=47, ext={EN=ArticleExt(id=1222466391354106681, articleId=1222466390532023064, tenantId=1146029695717560320, journalId=1189982191388893191, language=EN, title=Mechanism studies on solubility enhancement of ibuprofen by complexation with nicotinamide, columnId=1222466389101761499, journalTitle=Acta Pharmaceutica Sinica, columnName=Special Reports: Promoting the Dissolution of Poorly Soluble Drugs, runingTitle=null, highlight=null, articleAbstract=
The aim of this study is to investigate the effect of nicotinamide (NIC) on the solubility/dissolution of a poorly soluble drug ibuprofen (IBU), and to explore the mechanism of the formed soluble complex by complexation model, fluorescence quenching and Raman spectroscope. The results showed that NIC could significantly improve the solubility of IBU, and exhibited an Ap type complexation profile. The calculated complexation constants of K1:1 and K1:2 were 0.24 and 4.00, respectively. In the solution, the fluorescent intensity of IBU gradually decreased with the increase of NIC, exhibiting the typical fluorescence-quenching phenomenon. The Raman spectrum showed stretching vibrations, bending vibrations, and rocking vibrations ascribed to benzene ring of IBU and pyridine ring of NIC disappeared or significantly shifted, suggested that the soluble complex was formed by dipole-dipole interaction force between the benzene group on IBU and pyridine group on NIC, resulting in the aqueous solubility enhancement of IBU. In comparison to IBU alone, the physical mixture of IBU and NIC showed significantly higher dissolution rate (1.6-fold) and extent.
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本文研究了烟酰胺(nicotinamide,NIC)对难溶性药物布洛芬(ibuprofen,IBU)的增溶作用,并通过络合模型,结合荧光淬灭、拉曼光谱等分析络合物的形成机制。结果表明,NIC可显著提高IBU的溶解度,且随着NIC浓度的增加,IBU的溶解度也随之增大,呈现Ap型络合曲线,其络合常数K1:1与K1:2分别为0.24和4.00。荧光光谱表明,随着NIC浓度的增加,IBU所产生的荧光逐渐减弱,呈现明显的荧光淬灭现象,结合拉曼光谱分析可能是由于IBU分子中的苯环与NIC分子中吡啶环之间产生偶极-偶极作用力,形成水溶性络合物,使IBU溶解度显著增加。
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Influence of nicotinamide (NIC) concentration on the solubility of ibuprofen (IBU) in water , figureFileSmall=O8COPm2oKmg6fnIzNK9KFQ==, figureFileBig=LURMBjy6KaoyylfuSVA5qg==, tableContent=null), ArticleFig(id=1222466397955940672, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=EN, label=null, caption=null, figureFileSmall=ZBjCkeZE75OPfLkxC/uj4w==, figureFileBig=WvPPXPG/aFtxouEnk+74wA==, tableContent=null), ArticleFig(id=1222466398060798281, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=CN, label=Figure 2, caption=
Plot of equation (4) for determination of K1:1 and K1:2 for the complexation of IBU and NIC , figureFileSmall=ZBjCkeZE75OPfLkxC/uj4w==, figureFileBig=WvPPXPG/aFtxouEnk+74wA==, tableContent=null), ArticleFig(id=1222466398157267283, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=EN, label=null, caption=null, figureFileSmall=5MZPxXnz/u8Igj4iYWg08Q==, figureFileBig=RG1mugwFxy3wUUGlpPJTng==, tableContent=null), ArticleFig(id=1222466398287290717, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=CN, label=Figure 3, caption=
Fluorescence spectra of solutions containing 0.01 mol·L-1 IBU, 0.01 mol·L-1 NIC, and 0.01 mol·L-1 IBU with NIC at various molar ratios (5:1, 2:1, 1:1, 1:2 and 1:5) , figureFileSmall=5MZPxXnz/u8Igj4iYWg08Q==, figureFileBig=RG1mugwFxy3wUUGlpPJTng==, tableContent=null), ArticleFig(id=1222466398421508457, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=EN, label=null, caption=null, figureFileSmall=Wclsa5LFAjks3A0lq9uIag==, figureFileBig=2w09V5gqmLeNCK9V6GG8Rg==, tableContent=null), ArticleFig(id=1222466398526366068, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=CN, label=Figure 4, caption=
Electrostatic potential at the surface of IBU (a) molecular and NIC (b) molecular , figureFileSmall=Wclsa5LFAjks3A0lq9uIag==, figureFileBig=2w09V5gqmLeNCK9V6GG8Rg==, tableContent=null), ArticleFig(id=1222466398614446460, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=EN, label=null, caption=null, figureFileSmall=82nx8cmahO4fjLAtlAUt4g==, figureFileBig=2A0fT1BjFJMXkkFPOYFoIw==, tableContent=null), ArticleFig(id=1222466398736081287, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=CN, label=Figure 5, caption=
Raman spectra of aqueous solutions containing 0.1 mol·L-1 IBU, 0.1 mol·L-1 NIC, and 0.1 mol·L-1 IBU with NIC at the molar ratio of 1:1 , figureFileSmall=82nx8cmahO4fjLAtlAUt4g==, figureFileBig=2A0fT1BjFJMXkkFPOYFoIw==, tableContent=null), ArticleFig(id=1222466398840938896, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=EN, label=null, caption=null, figureFileSmall=3KxsLfuSTWfW8P66d4GPJw==, figureFileBig=E1Ctmp2PpjfdnbhaNctJbA==, tableContent=null), ArticleFig(id=1222466398945796505, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=CN, label=Figure 6, caption=
Intrinsic dissolution profiles of IBU from IBU alone and physical mixture of IBU and NIC (molar ratio, 1:1) in water (n = 3, x±s) , figureFileSmall=3KxsLfuSTWfW8P66d4GPJw==, figureFileBig=E1Ctmp2PpjfdnbhaNctJbA==, tableContent=null), ArticleFig(id=1222466399084208548, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=EN, label=null, caption=null, figureFileSmall=w+U0Vxy4T/5l8Ot2/RVpBQ==, figureFileBig=8+pCsTsdd00U/2CpDjPeBw==, tableContent=null), ArticleFig(id=1222466399226814890, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=CN, label=Figure 7, caption=
Non-sink dissolution profiles of IBU from IBU alone and physical mixture of IBU and NIC (molar ratio, 1:1) in water (n = 6, x±s) , figureFileSmall=w+U0Vxy4T/5l8Ot2/RVpBQ==, figureFileBig=8+pCsTsdd00U/2CpDjPeBw==, tableContent=null), ArticleFig(id=1222466399348449711, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| No. | Frequency/cm-1 | Absorption ascription |
| Ref. reported[28] | IBU | IBU-NIC |
| 1 | 1 609 | 1 611 | - | υin plane CCring |
| 2 | 1 453, 1 461, 1 466 | 1 451 | 1 451 | υCC, βCHring, τCH, bending CH |
| 3 | 1 390 | 1 391 | 1 393 | δHCC |
| 4 | 1 270, 1 283 | 1 276, 1 283 | 1 281 | υCCring, βCHring, δHCC, ωHO |
| 5 | 1 258 | 1 257 | 1 251 | Ωphenyl, ρ-substituted |
| 6 | 1 188 | 1 186 | 1 190 | υCHisopropyl |
| 7 | 1 116, 1 123 | 1 116 | 1 112 | βCHring, τCH, δCCH, bending CH |
| 8 | 834 | 833 | 833 | υasCCC, δin planeCCring, ρCH, τCH |
| 9 | 637 | 632 | 635 | δCCring |
), ArticleFig(id=1222466399457501622, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=CN, label=Table 1, caption=
Vibrational frequencies of 0.1 mol·L-1 IBU alone and the complexation with NIC (molar ratio, 1:1). υ: Stretching vibration; β: In-plane bending vibration; ρ: In-plane rocking vibration; ω: Out-of-plane rocking vibration; δ: Scissoring vibration; τ: Twisting vibration; υas: Asymmetrical stretching vibration; βtrig: In-plane trigonal radial breathing bending vibration
, figureFileSmall=null, figureFileBig=null, tableContent=
| No. | Frequency/cm-1 | Absorption ascription |
| Ref. reported[28] | IBU | IBU-NIC |
| 1 | 1 609 | 1 611 | - | υin plane CCring |
| 2 | 1 453, 1 461, 1 466 | 1 451 | 1 451 | υCC, βCHring, τCH, bending CH |
| 3 | 1 390 | 1 391 | 1 393 | δHCC |
| 4 | 1 270, 1 283 | 1 276, 1 283 | 1 281 | υCCring, βCHring, δHCC, ωHO |
| 5 | 1 258 | 1 257 | 1 251 | Ωphenyl, ρ-substituted |
| 6 | 1 188 | 1 186 | 1 190 | υCHisopropyl |
| 7 | 1 116, 1 123 | 1 116 | 1 112 | βCHring, τCH, δCCH, bending CH |
| 8 | 834 | 833 | 833 | υasCCC, δin planeCCring, ρCH, τCH |
| 9 | 637 | 632 | 635 | δCCring |
), ArticleFig(id=1222466399604302271, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| No. | Frequency/cm-1 | Absorption ascription |
| Ref. reported[29, 30] | NIC | IBU-NIC |
| 1 | 1 672 | 1 668 | - | υCO |
| 2 | 1 597 | 1 596 | 1 600 | υCCring, υNCring, ρCHring |
| 3 | 1 489 | 1 485 | - | ρCHring, υCCring, υNCring |
| 5 | 1 154 | 1 153 | - | υCCring, ρCHrin, βtrigpyridyl |
| 6 | 1 032 | 1 033 | 1 033 | βtrigpyridyl |
| 7 | 787 | 787 | - | βpyridyl, υCringCamide |
| 8 | 631 | 632 | 632 | βpyridyl, ρCNamide |
| 9 | 394 | 391 | 393 | τpyridyl, ωNH2, ωCringCamide |
), ArticleFig(id=1222466399734325706, tenantId=1146029695717560320, journalId=1189982191388893191, articleId=1222466390532023064, language=CN, label=Table 2, caption=
Vibrational frequencies of 0.1 mol·L-1 NIC alone and the complexation with IBU (molar ratio, 1:1)
, figureFileSmall=null, figureFileBig=null, tableContent=
| No. | Frequency/cm-1 | Absorption ascription |
| Ref. reported[29, 30] | NIC | IBU-NIC |
| 1 | 1 672 | 1 668 | - | υCO |
| 2 | 1 597 | 1 596 | 1 600 | υCCring, υNCring, ρCHring |
| 3 | 1 489 | 1 485 | - | ρCHring, υCCring, υNCring |
| 5 | 1 154 | 1 153 | - | υCCring, ρCHrin, βtrigpyridyl |
| 6 | 1 032 | 1 033 | 1 033 | βtrigpyridyl |
| 7 | 787 | 787 | - | βpyridyl, υCringCamide |
| 8 | 631 | 632 | 632 | βpyridyl, ρCNamide |
| 9 | 394 | 391 | 393 | τpyridyl, ωNH2, ωCringCamide |
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