Martínez Maritza, León de Pinto Gladys, Sanabria Lilian, Beltrán Olga, Igartuburu José M, Bahsas Ali
Centro de Investigaciones en Química de los Productos Naturales, Facultad de Humanidades y Educación, La Universidad del Zulia, Apartado 526, Maracaibo, Venezuela.
Carbohydr Res. 2003 Mar 28;338(7):619-24. doi: 10.1016/s0008-6215(02)00540-2.
The tree Spondias dulcis, located in Venezuela, exudes a light-brown gum. The polysaccharide, isolated from the original gum, contains galactose, arabinose, mannose, rhamnose, glucuronic acid, and its 4-O-methyl derivative. Application of chemical methods, in combination with 1D and 2D NMR spectroscopy afforded interesting structural features of the gum polysaccharide. The unequivocal presence of rhamnose in the polymer structure was confirmed by chemical and spectral data [1H (1.03 ppm); 13C (16.92 ppm)]. Also confirmed was the existence of 3-O- and 6-O-substitutes galactose residues by the spectral data correlations observed in Heteronuclear Multiple Quantum Coherence (HMQC) and Heteronuclear Multiple Bond Correlation (HMBC). Also observed were unequivocal resonances for beta-D-glucuronic acid and its 4-O-methyl derivative, and the presence of 3-O-alpha-L-arabinofuranose and 3-O-beta-L-arabinopyranose residues.
生长在委内瑞拉的金叶树会分泌出浅棕色树胶。从原始树胶中分离出的多糖含有半乳糖、阿拉伯糖、甘露糖、鼠李糖、葡萄糖醛酸及其4-O-甲基衍生物。通过化学方法结合一维和二维核磁共振光谱分析，得到了该树胶多糖有趣的结构特征。化学和光谱数据[1H (1.03 ppm); 13C (16.92 ppm)]证实了聚合物结构中鼠李糖的明确存在。通过异核多量子相干(HMQC)和异核多键相关(HMBC)中观察到的光谱数据相关性，也证实了3-O-和6-O-取代半乳糖残基的存在。还明确观察到了β-D-葡萄糖醛酸及其4-O-甲基衍生物的共振信号，以及3-O-α-L-阿拉伯呋喃糖和3-O-β-L-阿拉伯吡喃糖残基的存在。
