バイオ燃料と同時に高付加価値製品を生産する新しいバイオプロセス技術（Bioprocessing method yields high-value products alongside biofuels）

2025-02-25

2025-02-24 イリノイ大学アーバナ・シャンペーン校

イリノイ大学アーバナ・シャンペーン校の先進バイオエネルギー・バイオ製品イノベーションセンター（CABBI）と農業・消費者・環境科学部（ACES）の研究者たちは、油分を多く含むサトウキビ「オイルケーン」を用いて、バイオ燃料と高付加価値製品を同時に生産する持続可能なバイオリファイナリー技術を開発しました。従来、サトウキビはバイオエタノールの生産に利用され、搾汁後の繊維質残渣（バガス）は燃焼処理されていました。しかし、新たなプロセスでは、バガス中の有価物質を効率的に回収し、単一の原料から複数の製品を生成することが可能となりました。この研究は、社会のエネルギー需要に応える持続可能な供給源を提供するとともに、副産物による追加収益の創出にも寄与すると期待されています。

＜関連情報＞

バイオリファイナリーの製品ポートフォリオの再定義：天然着色料、植物性脂質および糖の回収 Redefining the product portfolio of oilcane bagasse biorefinery: Recovering natural colorants, vegetative lipids and sugars

Shivali Banerjee, Galit Beraja, Kristen K. Eilts, Vijay Singh
Bioresource Technology Available online: 9 January 2025
DOI:https://doi.org/10.1016/j.biortech.2025.132052

Graphical abstract

Highlights

Oilcane bagasse (OCB) has been explored as an alternative feedstock for recovering anthocyanins.
Pretreatment at 150 °C for 15 min could recover > 80 % (w/w) of the total anthocyanins.
The enhanced enzymatic digestibility is marked by the 2-fold increase in the glucose yield from the pretreated biomass.
A 1.5-fold enhancement of vegetative lipid content was observed in the residue pretreated at 150 °C for 15 min.
Generation of multiple streams of value-added products from OCB is promising for revenue generation.

Abstract

Bioenergy crops have been known for their ability to produce biofuels and bioproducts. In this study, the product portfolio of recently developed transgenic sugarcane (oilcane) bagasse has been redefined for recovering natural pigments (anthocyanins), sugars, and vegetative lipids. The total anthocyanin content in oilcane bagasse has been estimated as 92.9 ± 18.9 µg/g of dried bagasse with cyanidin-3-glucoside (13.5 ± 18.9 µg per g of dried bagasse) as the most prominent anthocyanin present. More than 85 % (w/w) of the total anthocyanins were recovered from oilcane bagasse at a pretreatment temperature of 150 °C for 15 min. These conditions for the hydrothermal pretreatment also led to a 2-fold increase in the glucose yield upon the enzymatic saccharification of the pretreated bagasse. Further, a 1.5-fold enrichment of the vegetative lipids was demonstrated in the pretreated residue. Re-defining green biorefineries with multiple high-value products in a zero-waste approach is the need of the hour for attaining sustainability.