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A comparative study on conventional and microwave-assisted extraction for microencapsulation of Garcinia fruit extract

Paper ID Volume ID Publish Year Pages File Format Full-Text
19289 43057 2013 8 PDF Available
Title
A comparative study on conventional and microwave-assisted extraction for microencapsulation of Garcinia fruit extract
Abstract

(−)-Hydroxycitric acid (HCA) is the principal acid present in the fruit rinds of certain species of Garcinia and is reported to have various health benefits. However, HCA is highly hygroscopic in nature and becomes lactonised during evaporation and drying. To reduce the lactonisation of HCA, Garcinia cowa fruit extract was obtained through two different extraction techniques, autoclave and microwave-assisted extractions, and was then microencapsulated using whey protein isolate (WPI) and denatured whey protein isolate (DWPI) with a 1:1 wall-to-core ratio using a spray drying technique. The microwave-assisted extracts encapsulated with WPI and DWPI had higher free HCA and net HCA recovery than the autoclaved extract encapsulated with similar wall materials. Furthermore, the microwave-assisted extracts and the associated encapsulated samples had higher antioxidant activity than their counterparts. The encapsulation of the microwave-assisted extracts with both wall materials had little variations in their free (55.04 and 54.58% for WPI and DWPI, respectively) and net HCA recovery (84 and 82%) and antioxidant activity (13.3 and 13.6%), which signified a smaller influence of the wall materials. These results indicated that microwave-assisted extraction had a higher extraction efficiency, encapsulation efficiency and antioxidant activity with both wall materials.

► Hydroxycitric acid is present in the fruit rinds of certain species of Garcinia. ► Garcinia fruit extract was encapsulated using spray drying technique. ► Whey protein isolate (WPI) and denatured WPI were used as wall materials.► Extraction technique and wall materials determine the quality of encapsulated powder.► Microwave-assisted extract yielded higher HCA recovery than autoclave extract.

Keywords
Microwave-assisted extractions; Autoclave extractions; Denatured whey protein; Microencapsulation
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A comparative study on conventional and microwave-assisted extraction for microencapsulation of Garcinia fruit extract
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 91, Issue 2, April 2013, Pages 103–110
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us