Obtaining Multiple Coproducts from Red Grape Pomace via Anthocyanin Extraction and Biogas Production

Abstract

Red grape pomace (RGP), a byproduct of red wine production, is an abundant food processing waste stream in California, rich in both anthocyanins, a class of red-blue pigments, and lignocellulose. Extraction of anthocyanins and biofuel production from RGP have been investigated independently, but no research has examined employing both strategies together for maximal valorization. In this study, anthocyanins were most effectively extracted from RGP at 80 °C. Convection- and vacuum-oven drying of the pomace were found to decrease anthocyanin yield, whereas lyophilization did not significantly affect yield. Fermentable sugars were successfully separated from the crude extract via solid-phase extraction. Ionic liquid pretreatment of RGP was determined to be a nonviable option for application to anaerobic digestion. Extraction reduced biomethane output, but supplementation with the aqueous fraction of the extract mitigated much of this difference, indicating sequential extraction and fractionation of anthocyanins from RGP can minimize the impact on biofuel yields.

Valorisation of grape pomace: an approach that is increasingly reaching its maturity – a review

“…With an ever increasing need to shift towards renewable energy (also improving waste management), innovations to combine these goals are particularly attractive as recently reported by Allison & Simmons (). The study developed a multi‐coproduct pipeline for red grape pomace to target both anthocyanins and biomethane.…”

Influences of Organic Loading, Feed-To-Inoculum Ratio, And Different Pretreatment Strategies On The Methane Production Performance of Eggplant Stalk

“…The theoretical maximum methane potential (MMP) was computed by Eqs. ( 1) and (2) (Ji et al 2017;Allison and Simmons 2018). The biodegradability (B d ) was calculated from Eq.…”

Composition and antioxidant activity of anthocyanins from Aronia melanocarpa extracted using an ultrasonic-microwave-assisted natural deep eutectic solvent extraction method

“…However, organic solvents are volatile, toxic, and harmful to the environment. In addition, waste liquid treatment is expensive [6] . Therefore, since the introduction of green chemistry in 1998, the demand for sustainable development has prompted an investigation on non-toxic, low-cost, pollution-free, and degradable green solvents as alternatives to organic solvents [7] , [8] , [9] .…”