Natural deep eutectic solvents pretreatment as an aid for pectin extraction from apple pomace

Three natural deep eutectic solvents (NADES; choline chloride (CC): lactic acid (LA), CC: oxalic acid (OA), CC: urea (U)) in the ratio 1:2 were tested as a pretreatment of apple pomace prior to hot water extraction of pectin. The pretreatment duration and temperature (for 0.5–2h, at 40–80 °C) was adjusted to limit cell wall polysaccharides losses and degradation. Extraction yields and sugar composition were used to evaluate the impact of the...