Ethanol Production from Extruded Thermoplastic Maize Meal by High Gravity Fermentation with Zymomonas mobilis.

Biotechnology Research International Pub Date : 2014-01-01 Epub Date: 2014-11-03 DOI:10.1155/2014/654853

Mayeli Peralta-Contreras, Edna Aguilar-Zamarripa, Esther Pérez-Carrillo, Erandi Escamilla-García, Sergio Othon Serna-Saldívar

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引用次数: 8

Abstract

A comparative study of extruded and ground maize meals as raw materials for the production of regular (12°P) and high gravity (20°P) worts was devised. Extruded water solubility index (WSI) was higher (9.8 percentage units) and crude fat was lower (2.64 percentage units) compared to ground maize. Free-amino nitrogen compounds (FAN), pH, and glucose were evaluated in regular and high gravity worts produced from ground or extruded maize. Extrusion improved glucose content and ethanol yield. In 20°P mashes, extrusion is enhanced by 2.14% initial glucose compared with regular ground mashes. The 12°P and 20°P extruded treatments averaged 12.2% and 8.4% higher ethanol, respectively, compared to the uncooked counterpart. The 20°P worts fermented with Zymomonas mobilis produced 9.56% more ethanol than the 12°P counterpart. The results show that the combination of extrusion and fermentation of 20°P worts improved ethanol yield per kg flour until 20.93%. This pretreatment stimulates Z. mobilis fermentation efficiency.

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流动单胞菌高重力发酵挤出热塑性玉米粉生产乙醇。

对挤压玉米粉和磨碎玉米粉作为生产常规(12°P)和高重力(20°P)麦汁的原料进行了比较研究。挤压水溶性指数(WSI)高于磨碎玉米(9.8个百分点单位)，粗脂肪含量较低(2.64个百分点单位)。研究人员对碾磨玉米和挤压玉米生产的普通麦芽汁和高重力麦芽汁进行了游离氨基氮化合物(FAN)、pH和葡萄糖的测定。挤压提高了葡萄糖含量和乙醇收率。在20°P的土豆泥中，与常规土豆泥相比，初始葡萄糖的挤压量提高了2.14%。与未煮熟的处理相比，12°P和20°P挤压处理的乙醇含量平均分别高出12.2%和8.4%。与12°P发酵相比，20°P发酵的麦汁乙醇产量增加9.56%。结果表明，20°P麦汁挤压与发酵相结合，每kg面粉乙醇得率提高至20.93%。这种预处理方法可以提高霉的发酵效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Biotechnology Research International

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