Spent coffee ground oil as a valuable source of epoxides and epoxidation derivatives: Quantitation and characterization using low-field NMR

• DOI: 10.1016/j.lwt.2022.113719
• Publication Date: 2022-06-29T03:29:10Z
• Authors: Kathryn Williamson; Thomas Banker; Xiaoying Zhao; Joana Ortega-Anaya; Rafael Jimenez-Fl...; Yael Vodovotz; Emmanuel Hatzakis
• Keywords: Plasticizer; Coffee grounds; Biopolymer; Supercritical fluid extraction; Proton NMR

Coffee waste, commonly referred to as spent coffee grounds (SCG), is currently discarded and has a negative impact on the environment. However, SCG are rich in valuable ingredients including 15–20% oil, which profile comparable vegetable oils used production of epoxides, biobased polyols, polymers. Our first objective was evaluate efficiency three different methods, namely Soxhlet, pressurized fluid extraction, supercritical CO2 (scCO2) oil extraction. Additionally, we aimed test potential low-field (LF) NMR analyze monitor formation epoxides polyols. Finally, evaluated epoxidized plasticizer for improving properties poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) bioplastic. Overall, showed promising source biopolymer precursors, while LF can be an efficient economic tool evaluation reaction monitoring.