Purpose

In this work one-stage, no presence of acidic catalyst hydrothermal extraction of pectin from sugar beet pulp (SBP) as a batch process was investigated, leading to increasing the value of this by-product of sugar beet industry.

Methods

The comprehensive study of the effect of the extraction temperature and the extraction time on the yield and composition of the pectin-enriched products, the water soluble product fractions and the water insoluble product fractions, were used that are feasible for industrial upscaling.

Results

It was shown that the highest yield of satisfactory purity of pectin extract (136.3 g kg⁻¹) was obtained at a temperature of 120 °C and a holding time of 20 min. Both further increase of the extraction temperature and extending extraction time favor the occurrence of partial hydrothermolysis of pectin and hemicellulose contained in the SBP, leading to the production of uronic acids, monosaccharides, carboxylic acids and furfurals. In the applied extraction conditions, other components of the SBP: cellulose, lignin and protein did not undergo depolymerization and were still present in the solid post-extraction residue.

Conclusions

This work provides an important method for the recovery of pectin from SBP using environmentally friendly technique and should help to facilitate further studies to develop a new process for the hydrothermal production of pectin from waste biomass.

Graphic Abstract

中文翻译：

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从甜菜浆中水热提取果胶的综合研究

目的

在这一阶段的工作中，没有研究过以酸性催化剂水热法从甜菜粕中分批提取果胶的过程，从而提高了甜菜工业副产品的价值。

方法

综合研究了萃取温度和萃取时间对富含果胶的产品的收率和组成，水溶性产品级分和水不溶性产品级分的影响，这对于工业规模化是可行的。

结果

结果表明，在120℃的温度和20分钟的保持时间下，获得了最高纯度的果胶提取物（136.3g kg ^-1）的令人满意的纯度。提取温度的进一步提高和提取时间的延长都促进了SBP中所含的果胶和半纤维素的部分水热解，从而导致了糖醛酸，单糖，羧酸和糠醛的生产。在应用的萃取条件下，SBP的其他成分：纤维素，木质素和蛋白质没有发生解聚，并且仍然存在于萃取后的残留物中。

结论

这项工作提供了一种使用环保技术从SBP中回收果胶的重要方法，并且应该有助于促进进一步的研究，以开发一种从废物生物质中水热生产果胶的新工艺。

图形摘要