A novel rice hull - microalgal biorefinery for the production of natural phenolic compounds comprising of rice hull acid pretreatment and a two-stage Botryococcus braunii cultivation process

被引：2

作者：

Papavasileiou, Polytimi ^{[1
,2
]}

Koutras, Stamatis ^{[1
,2
]}

Koutra, Eleni ^{[1
,2
]}

Ali, Sameh S. ^{[3
,4
]}

Kornaros, Michael ^{[1
,2
]}

机构：

[1] Univ Patras, Dept Chem Engn, Lab Biochem Engn & Environm Technol LBEET, Patras 26504, Greece

[2] Univ Patras, Inst Circular Econ & Environm ICEE, Res & Dev Ctr, Patras 26504, Greece

[3] Tanta Univ, Fac Sci, Bot Dept, Tanta 31527, Egypt

[4] Jiangsu Univ, Biofuels Inst, Sch Environm & Safety Engn, Zhenjiang 212013, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2023年 / 387卷

关键词：

Acid pretreatment; Microalgae natural phenolic compounds; Rice hull biorefinery; Two -stage cultivation;

D O I：

10.1016/j.biortech.2023.129621

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Recently, the rising demand of the industry for natural phenolic antioxidant compounds has turned to the study of microalgae as potential sources. Yet, more economic substrates for microalgal cultivation are sought to lower production costs. To this end, the present work deals with the utilization of rice hull hydrolysate (RHH) as substrate for microalgae Botryococcus braunii through a novel two-stage cultivation system. Initially, RHH was optimized to maximize the contained nutrients while minimizing its inhibitors content. The optimum point was reached under 121 degrees C, 60 min, 2% (v/v) H2SO4, 30% (w/v) loading. Next, B. braunii was successfully grown first heterotrophically in RHH (25%, v/v), obtaining high biomass production (6.67 g L-1) and then autotrophically to enhance phenolics accumulation. At the end, a high phenolic content of 7.44 & PLUSMN; 0.60 mg Gallic Acid Equivalents g-1 DW was achieved from the produced biomass, thus highlighting the potential of this novel biotechnological method.

引用

页数：10