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Solid‐state 13 C NMR study of palm trunk cell walls
Author(s) -
Gallacher James,
Snape Colin E,
Hassan Kamaruddin,
Jarvis Michael C
Publication year - 1994
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740640415
Subject(s) - lignin , cellulose , ferulic acid , elaeis guineensis , chemistry , vascular bundle , cell wall , parenchyma , rumen , food science , botany , organic chemistry , biochemistry , fermentation , biology , palm oil
Trunk material from the oil palm Elaeis guineensis was dissected into parenchyma and vascular bundle fractions, which were individually examined by 13 C solid‐state nuclear magnetic resonance at low field (25 MHz). Cross‐polarisation and magic‐angle spinning were used with dipolar dephasing to reveal the aromatic carbons of lignin free from interference by carbohydrate. The lignin contents of the parenchyma and vascular bundles were found to be 240 g kg −1 and 130 g kg −1 , respectively. The lignin appeared to contain a high proportion of aryl ether‐linked syringyl units, but little or no ferulic or p ‐coumaric acid. The cellulose of both fractions had a high proportion of the crystalline component. The acetyl content was c 6 mol %C. The in‐vitro digestibility of the two fractions was measured using the rumen liquor‐pepsin method and was found to be low compared with forage materials: 19.5% in the parenchyma and only 11.1% in the vascular bundles.