Abstract

In Brazil, the production and consumption of palm heart, especially from the Bactris gasipaes Kunth, generates a large number of lignocellulosic by-products. This study reports the obtainment of xylooligosaccharides (XOS) from xylans extracted from these residues. Xylans from peach palm waste (inner sheath and peel) were extracted using a mild alkali treatment with recovery yields of 82% and 80%, respectively. XOS were obtained through enzymatic hydrolysis employing a commercial xylanase with yields from xylan inner sheath and xylan peel of 50.1% and 48.8%, respectively. The antioxidant potential of XOS was measured employing five of the most commonly used procedures. In overall terms, the XOS from the xylans of peach palm wastes showed higher antioxidant capacity than the XOS obtained from the commercial xylans. The chemical structures of the XOS were determined by mass spectrometry (ESI–MS). The ESI–MS spectra suggest that XOS with grouped xylose or arabinose units ranging from 2 to 5 (differing by 132 Da) and as sodium adduct ions [M + Na]⁺ in the range of 100–1000 m/z. These results indicate that peach palm wastes can be explored to XOS production, which could be applied as natural antioxidants in functional food and pharmaceutical preparations.

Graphic Abstract

中文翻译：

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桃棕榈（Bactris gasipaes Kunth）废物的增值：抗氧化剂木寡糖的生产

摘要

在巴西，棕榈心的生产和消费，尤其是棕榈双歧杆菌的生产和消费Kunth产生大量木质纤维素副产物。该研究报道了从这些残基中提取的木聚糖获得的木寡糖（XOS）。使用温和的碱处理方法从桃棕榈废料（内鞘和果皮）中提取木聚糖，回收率分别为82％和80％。通过使用商业木聚糖酶的酶促水解获得XOS，木聚糖内鞘和木聚糖果皮的产率分别为50.1％和48.8％。XOS的抗氧化潜力是使用五个最常用的程序进行测量的。总体而言，桃棕榈废木聚糖中的XOS的抗氧化能力比商业木聚糖中的XOS高。XOS的化学结构通过质谱（ESI–MS）确定。⁺在100–1000 m / z的范围内。这些结果表明，桃棕榈废料可以用于XOS生产，可以用作功能性食品和药物制剂中的天然抗氧化剂。

图形摘要