title: Preliminary Assessment of the Chemical Stability of Dried Extracts from Guazuma ulmifolia Lam. (Sterculiaceae).
abstract: We report the results of a preliminary estimation of the stability of the dried extract from bark of Guazuma ulmifolia Lam. ("Mutamba"), with and without added colloidal silicon dioxide (CSD). The physical and chemical properties and the compatibility of CSD in the extract were evaluated for 21 days of storage under stress conditions of temperature (45 ± 2°C) and humidity (75 ± 5%). Thermogravimetry (TG) was supplemented using selective high-performance liquid chromatography (HPLC) for determination of stability of the characteristic constituents (chemical markers), namely, procyanidin B2 (PB2) and epicatechin (EP). The results showed that PB2 is an appropriate compound to be used as a chemical marker in the quality control of dried extracts of G. ulmifolia. The stress study showed that there was no significant difference between the two formulations. However, considering the TG data and the high temperatures involved, the results suggest that CSD increases the stability of the dried extract of G. ulmifolia.
authors.affiliation: Programa de Pós-Graduação em Ciências Farmacêuticas, Departamento de Farmácia, Universidade Estadual de Maringá, Avenida Colombo, 5790, 87020-900 Maringá, PR, Brazil.
authors.forename: Gisely C
authors.initials: GC
authors.lastname: Lopes
authors.forename: Renata
authors.initials: R
authors.lastname: Longhini
authors.forename: Paulo Victor P
authors.initials: PV
authors.lastname: Dos Santos
authors.forename: Adriano A S
authors.initials: AA
authors.lastname: Araújo
authors.forename: Marcos Luciano
authors.initials: ML
authors.lastname: Bruschi
authors.forename: João Carlos P
authors.initials: JC
authors.lastname: de Mello