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Biochemical and functional properties of wheat middlings bioprocessed by lactic acid bacteria.
Journal of Food Biochemistry ( IF 3.5 ) Pub Date : 2020-05-03 , DOI: 10.1111/jfbc.13262
Priscilla Magro Reque 1 , Cristian Mauricio Barreto Pinilla 1 , Federica Tinello 2 , Viviana Corich 2 , Anna Lante 2 , Alessio Giacomini 2 , Adriano Brandelli 1
Affiliation  

The present study aimed to investigate the bioprocessing of wheat middlings with different lactic acid bacteria (LAB) in order to improve biological activities of this by‐product of wheat flour production. The concentration of lactic acid, reducing sugars, and total phenolics, as well as antioxidant, antibrowning, antibacterial and prebiotic activities of fermented samples were analyzed. All LAB strains were capable to growth on wheat middlings, and pH decreased in the medium associated with lactic acid production during cultivation. Samples inoculated with Lactobacillus plantarum DSM20174 presented the maximum growth, lactic acid concentration above 2 mg/ml, and pH values around 3.8. The amount or reducing sugars decreased after 24 hr growth, except for maltose. Bioprocessed wheat middlings exhibited antioxidant, antibrowning, antibacterial, and prebiotic properties, related with the increase of total phenolic content. Highest values for antioxidant activities were obtained for L. plantarum and Streptococcus thermophilus strains, reaching values around 400 and 640 μM Trolox equivalents (TE) ml–1 for 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) and ferric ion reducing antioxidant power (FRAP) assays, respectively. Bioprocessing techniques using LAB can be an interesting approach to improve the availability of compounds with health‐promoting properties from lignocellulosic waste material.

中文翻译:

乳酸菌生物加工过的小麦中的生化和功能特性。

本研究旨在调查具有不同乳酸菌(LAB)的小麦中段的生物加工,以提高这种小麦粉生产副产品的生物活性。分析了发酵样品中乳酸,还原糖和总酚的浓度,以及抗氧化剂,抗褐变,抗菌和益生元的活性。所有LAB菌株都能够在小麦中龄上生长,并且在培养过程中与乳酸生产相关的培养基中pH降低。用植物乳杆菌接种的样品DSM20174表现出最大的生长,乳酸浓度高于2 mg / ml,pH值约为3.8。生长24小时后,除麦芽糖外,还原糖的量或减少。经过生物处理的小麦中麦表现出抗氧化剂,抗褐变,抗菌和益生元特性,与总酚含量的增加有关。获得了植物乳杆菌嗜热链球菌菌株的最高抗氧化活性值,达到约400和640μMTrolox当量(TE)ml –1左右分别用于2,2-二苯基-1-吡啶甲基肼基(DPPH)和铁离子还原抗氧化剂能力(FRAP)分析。使用LAB的生物加工技术可能是一种有趣的方法,可以提高木质纤维素废料中具有健康促进特性的化合物的利用率。
更新日期:2020-05-03
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