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Mannitol Is a Good Anticaking Agent for Spray-Dried Hydroxypropyl-Beta-Cyclodextrin Microcapsules.

Xingran Kou1,2, Xinping Zhang1, Ying Cheng1

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Summary
This summary is machine-generated.

Mannitol is the best anticaking agent for spray-dried hydroxypropyl-β-cyclodextrin (HP-β-CD) microcapsules. At a 12% ratio, it improves powder flowability and reduces moisture absorption, preventing undesirable agglomeration.

Keywords:
cakingcrystallisationmannitolmicrocapsulesspray drying

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Area of Science:

  • Materials Science
  • Pharmaceutical Technology
  • Chemical Engineering

Background:

  • Powder agglomeration is a common challenge in spray-dried microcapsules, impacting product quality and handling.
  • Hydroxypropyl-β-cyclodextrin (HP-β-CD) microcapsules are susceptible to caking, necessitating effective anticaking solutions.
  • Evaluating anticaking agents is crucial for optimizing powder properties in pharmaceutical and food applications.

Purpose of the Study:

  • To identify the most effective anticaking agent for spray-dried HP-β-CD microcapsules from four candidates: calcium stearate, magnesium stearate, silicon dioxide, and mannitol.
  • To investigate the mechanisms by which these anticaking agents prevent powder agglomeration.
  • To determine the optimal concentration of the best-performing anticaking agent.

Main Methods:

  • Spray drying of HP-β-CD microcapsules with varying concentrations of four anticaking agents.
  • Assessment of powder flowability, hygroscopicity, and caking properties.
  • Analysis of anticaking mechanisms, including glass transition temperature and surface interactions.

Main Results:

  • Mannitol (MAN) demonstrated superior anticaking performance compared to calcium stearate (CaSt), magnesium stearate (MgSt), and silicon dioxide (SiO2).
  • A 12% ratio of MAN resulted in HP-β-CD microcapsules with enhanced powder flowability, reduced hygroscopicity, and improved anticaking properties.
  • CaSt, MgSt, and SiO2 functioned by increasing the glass transition temperature, while MAN formed a protective crystal layer on the microcapsule surface.

Conclusions:

  • Mannitol is the most effective anticaking agent for spray-dried HP-β-CD microcapsules.
  • The optimal concentration for MAN is 12%, yielding microcapsules with desirable physical properties.
  • Understanding the distinct anticaking mechanisms is key to selecting appropriate agents for specific powder formulations.