Abstract
Viscosity, specific rotation and nitrogen content of 75 samples exudated by authenticated Acacia senegal trees of the sahelian station of M’Biddi (Ferlo, North Senegal) have been measured closely after their collection. The values of these parameters are largely scattered when compared with data generally accepted for commercial products, and only few fall completely within the specifications proposed by the JECFA-FAO. This behaviour is analyzed mainly in terms of the macromolecular structure of these fresh samples and the inherent heterogeneity of the exudates. Mechanical or moderate heat treatments are able to reduce this discrepancy. Moreover, no correlation has been found between the physico-chemical parameters and external conditions such as the location of the trees, tapping, harvesting or yields.
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