著者

香川 詔士

出版者

紙パルプ技術協会

雑誌

紙パ技協誌 (ISSN:0022815X)

巻号頁・発行日

vol.29, no.7, pp.376-383, 1975

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In order to investigate the properties of lignin in soda pulp waste liquor, Larix wood previously digested by 6% NaOH solution was isolated into PAL (pure alkali lignin). LAL (Larix alkali lignin=PAL) fractionated with organic solvents was investigated by gel filtration with CPG-10, dioxane-H<SUB>2</SUB>O (1 : 1) being used as eluent. Also, these lignin fractions were analzsed mainly by IR, UV, NMR, elemental analysis, - OMe and air oxidation.<BR>In the case of the LAL fractionated by organic solvents, results obtained were as follow : (1) Remarkable change in gel filtration, IR spectrum, and NMR spectrum patterns were shown in ether-soluble fraction. (2) The value for the weight average molecular weight calculated from gel filtration data for water-insoluble and ether-insoluble fraction, comprising more than 82% of the substance, seems to be for water-insoluble fraction about 73, 000 and ether-soluble fraction about 22, 000. (3) The change in the amount of air oxidation products of each fraction except ether-soluble fraction was scarcely observed.