Pharmaceutical Research

, Volume 27, Issue 11, pp 2374–2383

Crystallization of Trehalose in Frozen Solutions and its Phase Behavior during Drying

  • Prakash Sundaramurthi
  • Thomas W. Patapoff
  • Raj Suryanarayanan
Research Paper

ABSTRACT

Purpose

(i) To study the crystallization of trehalose in frozen solutions and (ii) to understand the phase transitions during the entire freeze-drying cycle.

Method

Aqueous trehalose solution was cooled to −40°C in a custom-designed sample holder. The frozen solution was warmed to −18°C and annealed, and then dried in the sample chamber of the diffractometer. XRD patterns were continuously collected during cooling, annealing and drying.

Results

After cooling, hexagonal ice was the only crystalline phase observed. However, upon annealing, crystallization of trehalose dihydrate was evident. Seeding the frozen solution accelerated the solute crystallization. Thus, phase separation of the lyoprotectant was observed in frozen solutions. During drying, dehydration of trehalose dihydrate yielded a substantially amorphous anhydrous trehalose.

Conclusions

Crystallization of trehalose, as trehalose dihydrate, was observed in frozen solutions. The dehydration of the crystalline trehalose dihydrate to substantially amorphous anhydrate occurred during drying. Therefore, analyzing the final lyophile will not reveal crystallization of the lyoprotectant during freeze-drying. The lyoprotectant crystallization can only become evident by continuous monitoring of the system during the entire freeze-drying cycle. In light of the phase separation of trehalose in frozen solutions, its ability to serve as a lyoprotectant warrants further investigation.

KEY WORDS

in situ freeze-drying XRD lyoprotectant crystallization phase transformation trehalose 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Prakash Sundaramurthi
    • 1
    • 2
  • Thomas W. Patapoff
    • 3
  • Raj Suryanarayanan
    • 1
  1. 1.Department of Pharmaceutics, College of PharmacyUniversity of MinnesotaMinneapolisUSA
  2. 2.Scientific Affairs, Teva Parenteral Medicines Inc.IrvineUSA
  3. 3.Early Stage Pharmaceutical Research and Development Genentech, Inc.South San FranciscoUSA

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