Efficient and selective method to separate triterpene acids by direct treatment of apple peels with alkaline ethanol

Triterpene acid extraction from dried apple peels of Fuji and Gala varieties in 2%NaOH/ethanol at room temperature, followed by filtration and acidification (pH 3), was investigated, comparing to a classical exhaustive extraction (Soxhlet, 2 h, with ethanol and methanol, >97% recovery). Alkali-et...

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Bibliographic Details
Published in:Separation science and technology 2016-08, Vol.51 (12), p.1986-1993
Main Authors: Tostes, João Batista de Freitas, Nakamura, Marcos Jun, de Saboya, Caroliny Gomes Franca, Mazzei, José Luiz, Siani, Antonio Carlos
Format: Article
Language:English
Subjects:
Acidification
Apple peels
cutin depolymerization
Ethanol
Ethyl alcohol
Extraction
Filtration
Methyl alcohol
Recovery
Solvents
triterpenes
ursolic acid
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Summary:Triterpene acid extraction from dried apple peels of Fuji and Gala varieties in 2%NaOH/ethanol at room temperature, followed by filtration and acidification (pH 3), was investigated, comparing to a classical exhaustive extraction (Soxhlet, 2 h, with ethanol and methanol, >97% recovery). Alkali-ethanol process yielded 4.35-6.86% (w/w) of whitish extracts, up to 15 times less than Soxhlet but with same recovery (P > 0.05) of ursolic and oleanolic acids. Alkaline extraction of previously defatted peels led to same recovery (P > 0.05), but the yield increased slightly (P < 0.01). The cost-effective and environmental-friendly procedure prepares triterpene-rich extracts from apple peels at high recovery, directly eliminating the cutin and avoiding prior treatments with hazardous organic solvents.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2016.1200088