BioPol, Departamento de Química, Universidade Federal do Paraná - UFPR, CxP 19081, CEP 81531-980, Curitiba, PR, Brazil.
Carbohydr Polym. 2013 Jan 30;92(1):312-20. doi: 10.1016/j.carbpol.2012.09.041. Epub 2012 Sep 29.
Polysaccharides (GNF) from Acacia mearnsii de Wild gum exudates, collected from trees growing in the south of Brazil, were characterized ((13)C and HSQC NMR, GC-MS, colorimetric assays). A commercial gum arabic (GAC) was analyzed similarly and compared with GNF. There were differences, consistent with distinct behavior in tensiometry tests and as emulsion stabilizer. GNF had a higher protein content than GAC, with small differences in the monosaccharide composition, the greater one being the lower uronic acid content of GNF (4%), compared with GAC (17%). GNF had a much broader molecular mass distribution, M(w)/M(n), and a lower M(w). GNF was more efficient in lowering the surface tension of water and saline solutions and was more efficient in emulsifying castor oil droplets. Results were discussed taking into account structural and molecular differences between the studied gums. It was concluded that polysaccharides from A. mearnsii de Wild are candidates as substitutes of currently commercialized arabic gums (Acacia senegal and Acacia seyal) having, depending on their application, improved properties.
来自巴西南部树木分泌的金合欢树胶（ Acacia mearnsii de Wild ）的多糖（ GNF ）经过了特征分析（ (13)C 和 HSQC NMR 、 GC-MS 、比色分析）。商业阿拉伯胶（ GAC ）也进行了类似的分析，并与 GNF 进行了比较。存在差异，这与在张力测试中的不同行为以及作为乳化稳定剂的行为一致。GNF 的蛋白质含量高于 GAC ，单糖组成略有不同，GNF 的酸性基团（4%）含量低于 GAC（17%）。GNF 的分子量分布更宽，重均分子量（ M(w)/M(n) ）和分子量（ M(w) ）更低。GNF 能更有效地降低水和盐水的表面张力，更有效地乳化蓖麻油液滴。考虑到所研究的胶之间的结构和分子差异，讨论了结果。结论是，金合欢树胶的多糖是目前商业化阿拉伯胶（ Acacia senegal 和 Acacia seyal ）的替代品，根据其应用，具有改善的性质。
