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Updated: Jun 27, 2026

Valorization of the Red Seaweed Gracilaria gracilis Through a Biorefinery Approach
Published on: November 21, 2023
Studies on chemical constituents of Gracilaria verrucosa
Zeynep Aydoğmuş1, Gülaçti Topcu, Kasim Cemal Güven
1Faculty of Pharmacy, Department of Analytical Chemistry, Istanbul University, Beyazit, Istanbul, Turkey. aydogmus@istanbul.edu.tr
Abstract:
A new sterol glucoside, (24R)-5 alpha-stigmast-9-(11)-en-3beta-D-glucopyranoside (1) has been isolated from a methanol extract of the red alga Gracilaria verrucosa, while cholesterol and (Z)-9-hexadecenoic acid (palmitoleic acid) have been isolated from a dichloromethane-acetone extract of the same alga. Additionally, an oily fraction of a dichloromethane-acetone extract has been investigated by gas chromatography/mass spectrometry (GC/MS). The main components in the oily fraction were heneicosanoic acid (49.8%), (Z)-9-octadecenoic acid (15.8%), and 15-tetracosenoic acid (15.6%) in addition to a few hydrocarbons, simple aromatics and a new compound, namely 3,4-dimethyl-5-carboxyclic acid-1-oxacyclopent-3-en-2-one. The structures of the isolated compounds have been elucidated by spectroscopic methods.
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