Change in the structural elements of cotton-plant lignins in the various vegetation periods
- 15 Downloads
1. The dioxane lignins of the cottonplant of various vegetation periods have been studied, and it has been shown that the lignin changes in the course of the development of the plant: the amount of methoxy groups increases and the amount of phenolic hydroxy groups decreases.
2. Gel chromatography of the lignins has shown that they are all polydisperse with a predominance of the high-molecular-weight fraction.
3. The 3,4-diethoxybenzaldehyde detected in the products of the alkaline nitrobenzene oxidation of dioxane lignin of the early vegetation period after its ethylation with diethyl sulfate is a direct proof of the presence of catechol structural units in cotton-plant lignin.
4. A quantitative determination of the catechol structures in the lignins of the cottonplant has shown that their amount decreases as the plant develops.
5. By decomposing the lignins with sodium and liquid ammonia, the presence in them of guaiacyl, syringyl, and p-coumaryl structural units has been confirmed and it has been shown that the lignin becomes less condensed as the plant grows, which is apparently connected with an increase in the degree of its methoxylation.
KeywordsCatechol Methoxy Structural Unit Nitrobenzene Hydroxy Group
Unable to display preview. Download preview PDF.
- 1.N. A. Veksler, L. S. Smirnova, and Kh. A. Abduazimov, Khim. Prirodn. Soedin., 645 (1974).Google Scholar
- 2.N. A. Veksler, L. S. Smirnova and Kh. A. Abduazimov, Khim. Prirodn. Soedin., 80 (1976).Google Scholar
- 3.A. Björkman, Svensk, Papperstidn.,59, 477 (1956),60, (158) (1967).Google Scholar
- 4.G. F. Prokshin, Izv. Vyssh. Uchebn. Zaved., Lesnoi Zh., No. 5, 141 (1956).Google Scholar
- 5.G. F. Prokshin, Izv. Vyssh. Uchebn. Zaved., Lesnoi Zh., No. 6, 113 (1969).Google Scholar
- 6.G. F. Zakis, V. Ya. Neiberte, and A. Ya. Mel'ke, Khim. Drev.,14, 98 (1973).Google Scholar
- 7.B. D. Bogomolov and S. D. Pal'mova, Nauch. Tr. Arkangel'skogo Lesotekhn. Inst., No. 38, 51 (1973).Google Scholar
- 8.Ch'ien Jen-yüan, Determination of Molecular Weights of Polymers [in Russian], Moscow (1962).Google Scholar
- 9.A. D. Alekseev, V. M. Reznikov, B. D. Bogomolov, and O. M. Sokolov, Khim. Drev., No. 4, 49 (1969).Google Scholar
- 10.M. N. Yakobson, P. P. Ernin'sh, B. A. Tsinite, and G. P. Veveris, Khim. Drev., No. 3,44, (1976).Google Scholar
- 11.N. N. Shorygina and A. F. Semechkina, Izv. Akad. Nauk SSSR, Ser. Khim., No. 4, 715 (1963); No. 5, 884 (1964); Khim. Drev., No. 1, 57 (1968); Zh. Obshch. Khim.,23, 1593 (1953);28, 3265 (1958).Google Scholar
- 12.N. N. Shorygina and A. F. Semechkina, Tr. ILKhP i KhD Akad. Nauk LatvSSR,19, 65 (1960).Google Scholar
- 13.S. A. Saidalimov, L. S. Smirnova, and Kh. A. Abduazimov, Khim. Prirodn. Soedin., 643 (1976).Google Scholar
- 14.A. Yamaguchi, M. Miyazaki, and A. Sakakibara, Mokuzai Gakkaishi,19, No. 1, 23 (1973).Google Scholar
- 15.A. Yamaguchi, Mokuzai Gakkaishi,19, No. 3, 141 (1973).Google Scholar
- 16.N. P. Mikhailov, N. N. Shorygina, and N. K. Vorob'ev, in: The Chemistry and Uses of Lignin [in Russian], Riga (1974), p. 321.Google Scholar
- 17.V. M. Reznikov and V. F. Novitskii, Khim. Prirodn. Soedin.,77, 283 (1975).Google Scholar
- 18.G. F. Zakis, L. N. Mozheiko, and G. M. Telysheva, Methods of Determining the Functional Groups of Lignin [in Russian], Riga (1975), pp. 16, 124, 118, 41 (1975).Google Scholar
- 19.H. McNair and E. Bohelli, Basic Gas Chromatography, fourth ed., Varian Aerograph, Walnut Creek, Calif. (1968).Google Scholar