Journal
MOLECULES
Volume 26, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/molecules26133870
Keywords
banana; pseudostem; rachis; biomass pretreatments; enzymatic saccharification; bioethanol fermentation; cellulose crystallinity
Funding
- project of Huazhong Agricultural University Independent Scientific & Technological Innovation Foundation [2662020ZKPY013, 2662019PY054]
- China Agriculture Research System of MOF and MARA [CARS-31-02]
- Project of Hubei University of Arts Science [XKQ2018006]
- National 111 Project from Ministry of Education of China [BP0820035]
- Project of Guangxi Key Laboratory of Sugarcane Biology [GXKLSCB-202009]
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This study identified a desirable banana crop containing large amounts of edible carbohydrates and digestible lignocellulose, leading to high bioethanol yields. Chemical analysis indicated that the cellulose CrI and lignin G-monomer are major recalcitrant factors affecting biomass enzymatic saccharification in banana pseudostems and rachis.
Banana is a major fruit crop throughout the world with abundant lignocellulose in the pseudostem and rachis residues for biofuel production. In this study, we collected a total of 11 pseudostems and rachis samples that were originally derived from different genetic types and ecological locations of banana crops and then examined largely varied edible carbohydrates (soluble sugars, starch) and lignocellulose compositions. By performing chemical (H2SO4, NaOH) and liquid hot water (LHW) pretreatments, we also found a remarkable variation in biomass enzymatic saccharification and bioethanol production among all banana samples examined. Consequently, this study identified a desirable banana (Refen1, subgroup Pisang Awak) crop containing large amounts of edible carbohydrates and completely digestible lignocellulose, which could be combined to achieve the highest bioethanol yields of 31-38% (% dry matter), compared with previously reported ones in other bioenergy crops. Chemical analysis further indicated that the cellulose CrI and lignin G-monomer should be two major recalcitrant factors affecting biomass enzymatic saccharification in banana pseudostems and rachis. Therefore, this study not only examined rich edible carbohydrates for food in the banana pseudostems but also detected digestible lignocellulose for bioethanol production in rachis tissue, providing a strategy applicable for genetic breeding and biomass processing in banana crops.
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