Extraction and Solubility Modeling of Anthocyanins Rich Extract from Hibiscus sabdariffa L. using Supercritical Carbon Dioxide

Abstract

This study aimed to evaluate the extraction yield, and anthocyanins content of Hibiscus sabdariffa L. calyces extract using different temperatures (T) at 50 - 70°C, pressure (P) at 8 - 12 MPa, and modifier ratio at 5 - 10%. This work used a supercritical carbon dioxide (SCCO2) extraction with ethanol and water as a modifier. The solubility of the extract was then measured before correlating using Chrastil, del Valle & Aguilera (dVA), and Adachi-Lu (A-L) models. This study revealed that a low T and increase in P at a constant modifier ratio would boost the anthocyanins content, contradicted with the extraction of total yield value, which is higher when increase T and low P. Meanwhile, analyzed results show that the solubility of Hibiscus sabdariffa calyces' extracts has successfully fitted the Chrastil's model with AARD of 27.72% as compared with dVA (35.42%) and A-L models (50.23%).