pH-Controlled fermentation of strawberry waste as phenol solubilisation method

JOURNAL OF CLEANER PRODUCTION

卷:266

Article

Serrano, Antonio^1,2  Newton, Georgia¹  Alonso-Farinas, Bernabe³  Fermoso, Fernando G.²  Villa-Gomez, Denys K.¹ 

[1] Univ Queensland, Sch Civil Engn, Campus St Lucia AEB Ed 49, St Lucia, Qld 4067, Australia

[2] CSIC, Inst Grasa, Ctra Utrera,Km 1, Seville, Spain

[3] Univ Seville, Dept Ingn Quim & Ambiental, Escuela Tecn Super Ingn, Camino Descubrimientos S-N, Seville 41092, Spain

关键词: Anthocyanins;    Energy balance;    Fermentation;    Methane;    Soluble phenols;    Volatile fatty acids;   

DOI  :  10.1016/j.jclepro.2020.121924

来源: Elsevier

【 摘 要 】

The present study aims to use pH as a control parameter for the accumulation of target compounds. Solubilisation of wasted strawberry through fermentation at different operational pH (pH 4, 7, and 9) was evaluated. Methane as a target compound was achieved at pH 7, reaching a value up to 353 +/- 10 mL CH4/g VS (VS, volatile solids). Operation at pH 9 was hardly controlled due to the low pH of the substrate and the accumulation of VFA. pH 9 resulted in the highest accumulation of VFA, mainly acetic acid. The operation at pH 4 resulted in the inhibition of the biogas production, leading to the concentration of soluble phenols up to 3 times the initial concentration in the reactors. The concentrations of pelargonidin 3-glucoside and p-coumaric acid showed a significant increase at pH 4 (p = 0.157 and p = 0.058, respectively). Acidogenic fermentation could be a suitable method to solubilise bioactive compounds from wasted strawberries without the necessity of high-energy pre-treatments. The low energy demand, i.e. 19 equivalent kJ/g gallic acid, as well as the high phenol solubilisation capacity, indicates that the acidogenic fermentation at pH 4 it is a promising method for the recovery of phenols from wasted strawberry. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free