Fractionation and characterization of cell wall polysaccharides from coffee (Coffea arabica L.) pulp

被引:9
|
作者
Reichembach, Luis Henrique [1 ]
Kaminski, Giulia Karolline [1 ]
Maurer, Juliana Bello Baron [1 ]
Petkowicz, Carmen Lucia de Oliveira [1 ]
机构
[1] Univ Fed Parana, Dept Biochem & Mol Biol, POB 19046, BR-81531980 Curitiba, Parana, Brazil
关键词
Sequential extraction; Plant cell wall; Polysaccharides; Chemical characterization; RHEOLOGICAL PROPERTIES; PECTIN; EXTRACTION; GREEN; CELLULOSE;
D O I
10.1016/j.carbpol.2023.121693
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Cell wall polysaccharides were isolated by sequential extractions from coffee pulp, the main solid waste from coffee processing. Extractions were conducted with distilled water at room and boiling temperatures, 0.5 % ammonium oxalate and 0.05 M Na2CO3 to obtain pectic fractions. Hemicelluloses were extracted by using 2 M and 4 M NaOH. The composition of the hemicellulose fractions suggested the presence of xyloglucans, gal-actomannans and arabinogalactan-proteins (AGPs). The main part of the cell wall polysaccharides recovered from coffee pulp were pectins branched with arabinogalactans. Coffee pulp pectic fractions were low-methoxylated with various amounts of protein (0.5-8.4 %) and phenolics (0.7-8.5 %). Detection at 280 nm in the HPSEC analyses and radial gel diffusion assay using Yariv reagent indicated the presence of AGPs in most of these fractions. NMR analyses of chelating agent (CSP) and dialyzed water (WSPD) extracted pectins were carried out. The results demonstrated that CSP contains only AG I. On the other hand, AG I and AG II are present in WSPD, probably covalently linked to the pectic portion. Comparison with the literature indicated similarities between the cell wall polysaccharides from coffee pulp and green coffee beans.
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页数:10
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