当前位置： SCI文献检索 > INTERNATIONAL JOURNAL OF PHARMACEUTICS期刊下所有文献 > Acid-base interactions in amorphous solid dispersions of lumefantrine prepared by spray-drying and hot-melt extrusion using X-ray photoelectron spectroscopy.

Acid-base interactions in amorphous solid dispersions of lumefantrine prepared by spray-drying and hot-melt extrusion using X-ray photoelectron spectroscopy.

Abstract：

:This study investigates drug-excipient interactions in amorphous solid dispersions (ASDs) of the model basic compound lumefantrine (LMN), with five acidic polymers. X-ray photoelectron spectroscopy (XPS) was used to measure the extent of the protonation of the tertiary amine in LMN by the five acidic polymers. The extent/efficiency of protonation of the ASDs was assessed a function of polymer type, manufacturing process (hot-melt extrusion vs. spray drying), and drug loading (DL). The most strongly acidic polymer, polystyrene sulfonic acid (PSSA) was found to be the most efficient polymer in protonating LMN, independently of manufacturing method and DL. The rank order for the protonation extent of LMN by each polymer is roughtly the same for both manufacturing processes. However, protonation efficiency of polymers of similar acidic strength ranged from ∼0% to 75% (HPMCAS and Eudragit L100-55, respectively), suggesting an important role of molecular/mixing effects. For some polymers, including Eudragit L100 55 and HPMCP, spray-drying resulted in higher protonation efficiency compared to hot-melt extrusion. This result is attributable to a more favorable encounter between acid and base groups, when exposed to each other in solution phase. Increasing DL led to decreased protonation efficiency in most cases, particularly for polyacrylic acid, despite having the highest content of acidic groups per unit mass. These results indicate that the combined effects of acid strength and mixing phenomena regulate the efficiency of acid-base interactions in the ASDs.

journal_name

Int J Pharm

journal_title

International journal of pharmaceutics

authors

Song Y,Zemlyanov D,Chen X,Su Z,Nie H,Lubach JW,Smith D,Byrn S,Pinal R

doi

10.1016/j.ijpharm.2016.06.126

subject

Has Abstract

pub_date

2016-12-05 00:00:00

pages

456-464

issue

2

eissn

0378-5173

issn

1873-3476

pii

S0378-5173(16)30616-0

journal_volume

514

pub_type

杂志文章

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