Reference

Structure of alkali lignins fractionated from Ricinus communis and bagasse

Structure of alkali lignins fractionated from Ricinus communis and bagasse. 2. Alkaline nitrobenzene oxidation. Mansour, Olfat Y.; Nagaty, Ahmed; Nagieb, Zeinat A. (Cell. Paper Lab., Natl. Res. Cent., Cairo, Egypt). J. Macromol. Sci., Chem., A21(3), 373-83 (English) 1984. CODEN: JMCHBD. ISSN: 0022-233X.Several substances with their cas registry numbers 123-08-0 and 121-33-5 may be metioned in this study. DOCUMENT TYPE: Journal CA Section: 43 (Cellulose, Lignin, Paper, and Other Wood Products) Alk. PhNO2 [98-95-3] oxidn. of the lignin isolated from kraft and soda cooking of R. communis and bagasse yielded mainly vanillin [121-33-5], followed by syringaldehyde [134-96-3] and p-hydroxybenzaldehyde [123-08-0]. The no. of guaiacyl units is higher than the sum of both syringyl and p-hydroxyphenylpropane units in soda lignin [8068-05-1] and Me2CO-sol. sulfate lignins for R. communis and bagasse. For Me2CO-insol. sulfate lignins, the no. of guaiacyl units is less or equal to the sum of both syringyl and p-hydroxyphenylpropane units for R. communis and bagasse. .

Magnesium deficiency results in increased suberization in endodermis and hypodermis of corn roots

Magnesium deficiency results in increased suberization in endodermis and hypodermis of corn roots. Pozuelo, Jose M.; Espelie, Karl E.; Kolattukudy, P. E. (Inst. Edafol. Biol. Veg., Madrid, Spain). Plant Physiol., 74(2), 256-60 (English) 1984. CODEN: PLPHAY. ISSN: 0032-0889. DOCUMENT TYPE: Journal CA Section: 19 (Fertilizers, Soils, and Plant Nutrition) The compn. of the aliph. components of suberin in the stele and cortex of young corn (Zea mays) roots was detd. by combined gas-liq. chromatog./mass spectrometry of the LiAlD4 depolymn. products. w-Hydroxy acids were the major class of the aliph. components of both the hypodermal (35%) and endodermal (28%) polymeric materials with the dominant chain length being C24 in the former and C16 in the latter. Nitrobenzene oxidn. of the roots generated p-hydroxybenzaldehyde [123-08-0] and vanillin [121-33-5] with much less syringaldehyde [134-96-3]. Electron microscopic examn. of the hypodermal and endodermal cell walls from roots of corn plants grown in a Mg2+-deficient (0.03 mM) nutrient soln. showed that these walls were more heavily suberized than the analogous walls of roots from plants grown in normal (2 mM) Mg2+ levels. Anal. of the LiAlD4 depolymn. products of the suberin polymers from these roots showed that the roots grown in low Mg2+ had 3.5 times as much aliph. suberin monomers on a wt. basis as the roots from plants grown in nutrient with normal Mg2+ levels. Roots from plants grown in Mg2+-deficient nutrient soln. released 3.8 times the amt. of arom. aldehydes upon nitrobenzene oxidn. as that released from normal roots. As the degree of Mg2+ deficiency of the nutrient soln.Some chemicals with cas registry numbers like 123-08-0 and 7439-95-4 are also used. was increased, there was an increase in the aliph. and arom. components characteristic of cuberin. Thus, both ultrastructural and chem. evidence strongly suggested that Mg2+ deficiency resulted in increased suberization of the cell walls of both hypodermis and endodermis of Zea mays roots. The roots from Mg2+-deficient plants also had a higher amt. of peroxidase [9003-99-0] activity when compared to control roots. .