Preparation and characterization of calcium-shellac spheres as a carrier of carbamide peroxide.

Abstract:

:This paper describes a novel approach to prepare and characterize calcium-shellac spheres as a carrier of a tooth whitening agent carbamide peroxide. Calcium-shellac spheres were prepared using an extrusion technique based on dropping aqueous ammonium shellac solution into calcium chloride solution. The effects of formulation and processing conditions on the encapsulation efficiency of carbamide peroxide, physical and mechanical properties of the formed calcium-shellac spheres were investigated. The inner structure of the spheres was characterized using X-ray micro-computed tomography and their mechanical strength was determined using a Lloyds Material Testing Machine. Possible reactions between ammonium shellac and calcium chloride and carbamide peroxide, respectively, have been proposed based on experimental measurements using Fourier Transform Infrared Spectroscopy (FTIR).

journal_name

J Microencapsul

authors

Xue J,Zhang Z

doi

10.1080/02652040802049638

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

523-30

issue

8

eissn

0265-2048

issn

1464-5246

pii

792371718

journal_volume

25

pub_type

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