The polysaccharide from Aloe vahombe (lilaceae) was submitted to partial hydrolyses by sulfuric, oxalic and phosphoric acid. Some oligosaccharides were isolated and investigated by chemical and 13C NMR spectroscopic methods. Their structure was determined. The results prove unambiguously that in the analyzed material the D-mannose is linked to the D-glucose by beta-1----4 linkages to form a carbohydrate heteropolymer.
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[Induction of lymphoblastic transformation by a polysaccharide extract of a native Madagascar plant Aloe vahombe: ALVA].
Arch Inst Pasteur Madagascar
June 1988
Université de Madagascar, E.E.S. Sciences Antananarivo.
The polysaccharide mixture obtained by hot water extraction of Aloe vahombe leaves is composed of at least four different paritally acetylated glucomannans which differ in molecular weight, glucose to mannose ratios and acetyl contents. Furthermore, one fraction contains a small but significant amount of protein which could not be removed by gel filtration in a hydrogen-bond-breaking medium, by DEAE-Sephadex A-50 anion exchange chromatography, or by Sevag's method.
View Article and Find Full Text PDFThe polysaccharide from Aloe vahombe (lilaceae) was submitted to partial hydrolyses by sulfuric, oxalic and phosphoric acid. Some oligosaccharides were isolated and investigated by chemical and 13C NMR spectroscopic methods. Their structure was determined.
View Article and Find Full Text PDFAn immuno-modulator fraction (Alva) extracted from an endemic plant, in the south of Madagascar, the Aloe vahombe, significantly protects mice against bacterial, parasitic and fungal infections. Wishing to verify whether the fraction Alva was active in tumour reduction, we studied its effect on the development of experimental fibrosarcoma and melanoma in mice by intravenous and intracutaneous injections and injections directly into the tumour of the immunostimulant fraction. We have observed cures, only in the case of the McC3-1 tumour but it is encouraging to note that under different experimental conditions the rate of growth of tumours in animals which were treated is slower than in those not treated.
View Article and Find Full Text PDFA partially purified extract of leaves of Aloe vahombe, a plant endemic in the south of Madagascar, administered intravenously to mice, protects them against infection of bacteria (Listeria monocytogenes, Yersinia pestis), parasites (Plasmodium berghei) and fungus (Candida albicans). The protective fraction must be administered two days before inoculation of the pathogenic agent. These results significantly confirm those we obtained in earlier study on mice infection by Klebsiella pneumoniae.
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