Abstract

PEREZ, Tania et al. Stability on shelf (second year) of a gel from the Rhizophora mangle L.. Rev Salud Anim. [online]. 2012, vol.34, n.3, pp. 178-183. ISSN 0253-570X.

A long-term shelf stability or shelf life of a formulation is a critical factor in obtaining a quality product; moreover in natural products since they are often prone to deterioration, especially during storage. The stability of three pilot batches of a semisolid gel was evaluated at 5 ± 3 ºC during the second year. They were obtained from R. mangle L bark aqueous extract. Lots were produced at pilot scale and packaged in internally lacquered aluminum tubes of 25 g. Physical-chemical and microbiological indicators were evaluated after 24 months of storage and compared with those obtained at the initial time and after 12 months. All batches showed stable organoleptic properties, pH 6 to 7, extensibility area of 30-50 cm², microbial limit <10² CFU/g, antimicrobial activity between 8-10 mg/g and rheological behavior of a non-newtonian fluid type Herschel Bulkley, without significant differences with the earlier times. The concentration of total tannins showed variation over time; however, this indicator was within the acceptance limit for a 13-30 mg/g formulation. These results allowed proposing a shelf life of the product of two years under the storage conditions tested.

Keywords : stability; gel; Rhizophora mangle L.

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