کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5157493 1500602 2017 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of hemicelluloses from Neolamarckia cadamba (Rubiaceae) during xylogenesis
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Characterization of hemicelluloses from Neolamarckia cadamba (Rubiaceae) during xylogenesis
چکیده انگلیسی
In this study, hemicelluloses were isolated from the apical, middle and basal segments of N. cadamba using a 2 N KOH extraction procedure. Chemical composition and structural characterization of the three hemicellulosic fractions obtained were comparatively investigated by a combination of HPLC, GPC, FTIR, 1H,13C, HSQC NMR and TGA techniques. According to the sugar analysis and spectral results, (4-O-methyl) glucuronoxylan was the primary hemicellulose identified in the samples with trace levels of mannan also present. All of the three samples showed spherical polymers in 0.005 M sodium phosphate solution (containing 0.02 N NaCl). Xylan in the middle and basal segment stems had higher molecular weights. Our findings show that during xylogenesis in N. cadamba, changes are observed in xylan content and molecular weight.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 156, 20 January 2017, Pages 333-339
نویسندگان
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