Bio-oil Fractionation According to Polarity and Molecular Size: Characterization and Application as Antioxidants

IF 5.2 3区工程技术 Q2 ENERGY & FUELS

Energy & Fuels Pub Date : 2024-09-25 DOI:10.1021/acs.energyfuels.4c0264110.1021/acs.energyfuels.4c02641

Isabel Fonts, Cristina Lázaro, Alfonso Cornejo, José Luis Sánchez, Zainab Afailal, Noemí Gil-Lalaguna* and Jesús María Arauzo,

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引用次数: 0

Abstract

Bio-oil obtained from biomass pyrolysis has great potential for several applications after being upgraded and refined. This study established a method for separating bio-oil into different fractions based on polarity and molecular size to extract phenolic and polyphenolic compounds with antioxidant properties. The fractions were analyzed using various spectroscopic and chromatographic techniques, such as GC/MS, FTIR, UV–vis, SEC, DOSY-NMR, ¹³C-NMR, and ³¹P-NMR. The antioxidant properties of these fractions were tested by examining their ability to improve the oxidative stability of biodiesel. The results strongly connected the bio-oil’s chemical functionalities and antioxidant power. During solvent fractionation, dichloromethane could extract phenolic structures, which were subsequently size-fractionated. The subfractions with lower molecular weight (in the order of monomers and dimers) outperformed the antioxidant potential of the crude bio-oil. Heavier subfractions from dichloromethane extraction did not show good antioxidant abilities, which was related to the low hydroxy group content. After solvent extraction, phenolic oligomers remained in the water-insoluble/dichloromethane-insoluble fraction, which showed good antioxidant potential despite its low solubility in biodiesel.

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根据极性和分子大小对生物油进行分馏：表征及作为抗氧化剂的应用

从生物质热解中获得的生物油经过升级和提炼后，在多种应用领域具有巨大潜力。本研究建立了一种根据极性和分子大小将生物油分离成不同馏分的方法，以提取具有抗氧化特性的酚类和多酚类化合物。采用各种光谱和色谱技术，如 GC/MS、FTIR、UV-vis、SEC、DOSY-NMR、13C-NMR 和 31P-NMR 对馏分进行了分析。通过检测这些馏分改善生物柴油氧化稳定性的能力，测试了它们的抗氧化特性。结果表明，生物油的化学功能性与抗氧化能力密切相关。在溶剂分馏过程中，二氯甲烷可以提取酚类结构，随后对其进行大小分馏。分子量较低（按单体和二聚体顺序排列）的子馏分的抗氧化潜力优于粗生物油。二氯甲烷萃取的较重子馏分没有显示出良好的抗氧化能力，这与羟基含量较低有关。溶剂萃取后，酚类低聚物仍留在水不溶/二氯甲烷不溶馏分中，尽管其在生物柴油中的溶解度较低，但仍显示出良好的抗氧化潜力。

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来源期刊

Energy & Fuels 工程技术-工程：化工

CiteScore

9.20

自引率

13.20%

发文量

1101

审稿时长

2.1 months

期刊介绍： Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.