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- W1986292889 abstract "The effect of the concentration of sulphuric acid, and of variations in the period and temperature of the digestion, on the determination of lignin In flax fibre has been ascertained. For both wax-free and alkali-extracted samples, a digestion period of 2 hours at 20°C with 20 ml. of sulphuric acid of concentration 71.8 to 72.0 per cent (W/w) (sp. gr. 1.638–1.640 at 15°C) was satisfactory when care was taken to ensure that the fibre was completely dispersed in the acid during the digestion.The recovered lignin could be separated into two fractions by treatment with acid sodium chlorite (0.7 per cent), and, in this respect. differed from jute lignin. The fraction soluble in sodium chlorite contained nearly all the methoxyl groups, and the suggestion is made that this fraction consists mainly of the “middle lamella” lignin, whereas the insoluble fraction is in the cell wall of the fibre.Some of the lignin was dissolved by the digesting acid, but, at the recommended concentration, the amount was small." @default.
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- W1986292889 date "1955-12-01" @default.
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- W1986292889 title "54—The Determination of Lignin In Flax Fibre" @default.
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- W1986292889 doi "https://doi.org/10.1080/19447027.1955.10750369" @default.
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