Abstract

The impact of conditions in extraction of natural admixtures (pectin compounds, hemicelluloses, and lignin) from hemp fiber during chemical modification of fibrous mass was studied. It was shown that the maximum extraction of admixtures requires increasing the temperature of fiber treatment to 100°С and the sodium hydroxide concentration to 10 g/L. Using infrared spectroscopy and potentiometric titration methods, it was proved that the increase in alkalinity of the boiling liquor leads not only to the increase in the amount of admixtures in the liquor but also to their destruction, while the complex of reducing ingredients that was formed in the liquor can act as a reductant of silver ions even under conditions of low temperatures in extraction. The kinetics of reduction of silver ions in the extract liquor was investigated. The correlation of the efficiency of the reduction of silver ions and the quantitative content of admixtures in the liquor was found. Using photon correlation spectroscopy, it was shown that reduction in an extract obtained under high alkalinity makes it possible to obtain particles of small size, not more than 30 nm. It was proved that the antimicrobial activity of synthesized sols and cellulosic materials treated with these sols against test cultures depends on the synthesis conditions.

中文翻译：

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大麻纤维提取物中合成超细银颗粒的条件优化

摘要

研究了条件对大麻纤维化学改性过程中从大麻纤维中提取天然混合物（果胶化合物，半纤维素和木质素）的影响。结果表明，最大程度地萃取混合物需要将纤维处理温度提高至100°C，并将氢氧化钠浓度提高至10 g / L。使用红外光谱法和电位滴定法证明，沸腾液体的碱度增加不仅导致液体中混合物含量的增加，而且导致其被破坏，而形成的还原成分的络合物即使在低温提取条件下，该液体也可以充当银离子的还原剂。研究了萃取液中银离子还原的动力学。发现还原银离子的效率与液体中混合物的定量含量之间的相关性。使用光子相关光谱法，显示出在高碱度下获得的提取物的还原使得可以获得小尺寸，不大于30nm的颗粒成为可能。已经证明，合成溶胶和用这些溶胶处理的纤维素材料对测试培养物的抗菌活性取决于合成条件。