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Production of decaffeinated green tea leaves using liquefied dimethyl ether

Paper ID Volume ID Publish Year Pages File Format Full-Text
19102 43045 2013 5 PDF Available
Title
Production of decaffeinated green tea leaves using liquefied dimethyl ether
Abstract

We developed a new technique for green tea decaffeination involving ingredient extraction and drying of green tea leaves by using liquefied dimethyl ether (DME) as a safe extraction solvent. After hot water extraction with water content of 74.6–76.2%, green tea leaves were tested to verify the DME extraction in both laboratory- and bench-scale processes. The distributions of caffeine and catechins in the extracted residue, organic extracts, and removed water were tested by high-performance liquid chromatography. Caffeine was completely removed from the green tea leaves. Approximately 25.2–56.0% of catechins remained in the residue after DME extraction. In particular, 56.0% of epigallocatechin gallate, which has the greatest activity of all catechins remained in the residue.

► A single step method combined decaffeination, drying, and ingredients extraction for green tea leaves. ► Caffeine was completely removed from the green tea leaves using liquefied dimethyl ether. ► 25.2–56.0% of catechins remained in green tea leaves after DME extraction, especially, 56.0% of EGCG. ► This method is safely, economically and environmentally friendly.

Keywords
Green tea; Decaffeination; Catechins; Dimethyl ether; Safe extraction solvent; Tea leaves drying
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Production of decaffeinated green tea leaves using liquefied dimethyl ether
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 91, Issue 4, October 2013, Pages 376–380
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