Encapsulation of Vitamin A palmitate for animal supplementation: Formulation, manufacturing and stability implications

J Microencapsul. 2010;27(2):150-61. doi: 10.1080/02652040903052036.

Abstract

Two manufacturing methods and numerous formulative approaches have been evaluated to obtain a stable oral pharmaceutical form of Vitamin A palmitate (VAP), a substance very sensitive to light, temperature, humidity and metal ions. The best results were obtained by formulating VAP, stabilized with butylated hydroxytoluene (BHT), in double layer microcapsules constituted by a core of chitosan, Tween 20, CaCl(2) and EDTA surrounded by a first chitosan-alginate membrane and an outer membrane of calcium-alginate. This formulation design enabled the production of beads with high drug loading (42% w/w) and high encapsulation efficiency (94%). The stability of VAP-loaded microcapsules was assessed according to EMEA guidelines. This formulation design showed the best performance in terms of VAP recovery (t(50%) > 360 days) after 1 year of storage at room conditions. This is a very important result considering the poor shelf-life (45 days) of pure VAP stabilized with BHT stored at the same conditions.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Capsules / chemistry
  • Diterpenes
  • Drug Compounding / economics
  • Drug Compounding / methods*
  • Drug Stability
  • Light
  • Retinyl Esters
  • Temperature
  • Vitamin A / administration & dosage
  • Vitamin A / analogs & derivatives*

Substances

  • Capsules
  • Diterpenes
  • Retinyl Esters
  • Vitamin A
  • retinol palmitate