Purpose

The aim of this study was to produce a high yield of direct hydrolysis of glucose from a cotton towel and wheat straw by microwave-assisted (MW) treatment.

Methods

To this effect, a freeze-thawing with 3% NaOH was added before MW treatment. Multiple MW parameters were tested.

Results

For the towel, the highest glucose yield of 42.4% based on freeze-thawing with 3% NaOH-treated sample was observed after MW treatment at 200 °C for 30 s with 2% sulfuric acid as a catalyst. This corresponded to a 44.4% yield based on the cellulose content of treated samples, which was 1.3-fold higher than that of samples treated only by MW at 200 °C for 7 min with 1% sulfuric acid as a catalyst (maximum glucose yield in our previous report). For wheat straw, the highest glucose yield of 27.0% based on freeze-thawing with 3% NaOH-treated sample, and 41.9% based on the treated sample cellulose content were observed after MW treatment at 200 °C for 3 min with 0.5% sulfuric acid as a catalyst. Under the optimum conditions, the glucose yield was 40.5% from raw towel and 14.7% from wheat straw.

Conclusion

Combined severity parameter analysis revealed that the addition of freeze-thawing with NaOH before the MW treatment increased the glucose yield and reduced the severity of the treatment conditions. In conclusion, freeze-thawing using 3% NaOH before MW treatment is effective for the direct hydrolysis of glucose from towels and wheat straw.

Graphic Abstract

中文翻译：

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NaOH冻融法微波辅助水解毛巾和小麦秸秆中的纤维素

目的

这项研究的目的是通过微波辅助（MW）处理，从棉毛巾和麦草中获得高产率的直接水解葡萄糖的方法。

方法

为此，在MW处理之前加入3％NaOH的冻融。测试了多个MW参数。

结果

对于毛巾，在以2％硫酸为催化剂的200℃下MW处理30s后，基于用3％NaOH处理的样品的冻融观察到的最高葡萄糖产率为42.4％。这相当于基于处理过的样品的纤维素含量的44.4％的收率，比仅在1％的硫酸在200°C的条件下进行MW处理7分钟的MW处理的样品高1.3倍（最大葡萄糖收率）。我们之前的报告）。对于小麦秸秆，以0.5％的硫酸在200°C下进行3分钟的MW处理后，观察到最高的葡萄糖产率为27.0％（以3％NaOH处理过的样品进行冷冻解冻）和41.9％（以处理过的样品中的纤维素含量为基础）。酸作为催化剂。在最佳条件下，生毛巾的葡萄糖得率为40.5％，麦秸的葡萄糖得率为14.7％。

结论

组合的严重性参数分析表明，在MW处理之前添加NaOH冻融可增加葡萄糖产量并降低处理条件的严重性。总之，在微波处理之前使用3％NaOH进行冻融可有效地直接水解毛巾和麦草中的葡萄糖。

图形摘要