The effect of water plasticization on the molecular mobility and crystallization tendency of amorphous disaccharides

Ville Petteri Heljo (Corresponding Author), Antti Nordberg, Mikko Tenho, Tommi Virtanen, Kirsi Jouppila, Jarno Salonen, Sirkka Liisa Maunu, Anne Mari Juppo

Research output: Contribution to journalArticleScientificpeer-review

38 Citations (Scopus)

Abstract

Purpose To study how water plasticization affects the molecular mobility and crystallization tendency of freeze-dried trehalose, sucrose, melibiose and cellobiose. Methods Freeze-dried disaccharides were subjected to different relative humidity atmospheres and their physical stabilities were evaluated. Lyophilizate water sorption tendencies and glass transition temperatures were modeled using Brunauer-Emmett-Teller (BET) and Gordon-Taylor (GT) equations, respectively. Sucrose and cellobiose crystallization tendencies were compared by using the concept of reduced crystallization temperature (RCT), and the molecular mobilities of trehalose and melibiose were compared by measuring their T1H relaxation time constants. Results Based on the BET and GT models, water sorption tendency and the resulting plasticizing effect were different in sucrose when compared to the other disaccharides. Trehalose and melibiose exhibited generally slower crystallization rates when compared to sucrose and cellobiose. Amorphous melibiose was shown to be particularly stable within the studied water content range, whichmay have partly been caused by its relatively slow molecular mobility. Conclusions Slow amorphous-to-crystalline transition rate is known to be important for lyoprotecting excipients when formulating a robust drug product. The physical stabilities of amorphous trehalose and melibiose even with relatively high water contents might make their use advantageous in this respect compared to sucrose and cellobiose.

Original languageEnglish
Pages (from-to)2684-2697
Number of pages14
JournalPharmaceutical Research
Volume29
Issue number10
DOIs
Publication statusPublished - Oct 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • Amorphous
  • Crystallization
  • Disaccharide
  • Mobility
  • Water

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