Study of the molecular weight of bark extracts and products of their reaction with formaldehyde

Biomass Pub Date : 1990-01-01 DOI:10.1016/0144-4565(90)90048-O

Chia M. Chen, Y. Hatano

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引用次数: 6

Abstract

The molecular weights of sodium hydroxide extracts of various barks were determined by means of gel permeation chromatography (GPC). Products of these bark extracts were then obtained by allowing those extracts to react with formaldehyde or with formaldehyde and phenol. Following this, the molecular weight of the products were determined to investigate their reactivity.

The molecular weight and reactivities of bark extracts toward formaldehyde differed with respect to species and extraction conditions. Reactivity was improved by adjusting the pH of reaction mixture before the reaction. After reacting with formaldehyde, bark extracts of high temperature extraction decreased their molecular weight, whereas those of low temperature extraction decreased their molecular weight; however, the molecular weight of low temperature extracts increased by adjusting the pH of the extracts to the same level as the high temperature extracts before the reaction. The chromatogram of acetylated samples obtained from three reactants (southern pine bark extracts, formaldehyde and phenol) shifted toward the higher molecular weight side, as compared to that of extracts before reaction.

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树皮提取物及其与甲醛反应产物的分子量研究

采用凝胶渗透色谱法(GPC)测定了各种树皮氢氧化钠提取物的分子量。然后通过让这些提取物与甲醛反应或与甲醛和苯酚反应获得这些树皮提取物的产品。然后，测定产物的分子量以考察其反应性。不同树种和不同提取条件下，树皮提取物的分子量和对甲醛的反应性不同。在反应前通过调节反应液的pH来提高反应活性。与甲醛反应后，高温提取的树皮提取物分子量降低，低温提取的树皮提取物分子量降低;而在反应前将低温浸提液的pH调节到与高温浸提液相同的水平，则使低温浸提液的分子量增加。与反应前的提取物相比，三种反应物(南松皮提取物、甲醛和苯酚)乙酰化后的样品的色谱向分子量较高的一侧偏移。

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Biomass

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