00 mm thick layers Imatinib mouse and placed in the dryer (NG científica) at 74 °C, with hot air circulation at a velocity of 0.5 m/s for 120 min. The dehydrated foam was ground in an industrial blender (Skymsen) to form a powder.

For the shelf life study, 25 g samples of powdered guavira pulp were packed into 120 × 120 mm (10 μm thick) low density polyethylene (LDPE) bags. The study was carried out under two controlled environmental conditions: (1) relative humidity of 75% and temperature of 25 °C (environmental conditions) and (2) relative humidity of 90% and temperature of 35 °C (accelerated conditions). The environmental humidity conditions (relative humidity) were reproduced in desiccators containing saturated solutions of sodium chloride (aw = 0.75) for the environmental conditions (1) and barium chloride (aw = 0.90) for the accelerated conditions (2). The

guavira powder packages were distributed in the MAPK Inhibitor Library concentration desiccators so that they did not obstruct the circulation of the moist air inside the systems, avoiding direct contact with the saturated solutions. The temperature conditions were maintained constant by placing the desiccators inside BOD (biochemical oxygen demand) chambers. The storage period was 90 days and during this period, three packages of samples were removed every 10 days for evaluation of the moisture content, water activity, vitamin C content, pH value and titratable acidity. The analyses carried out at zero time were considered to be the standard condition. The moisture content was determined using a gravimetric method in an incubator with air circulation according to the AOAC method 15010 (1975), adapted for 70 °C and 24 h to avoid sample caramelization; the following Sitaxentan parameters were measured, water activity (aw) by direct measurement in a hygrometer

(Aqualab, Decagon, series 3.0); vitamin C content by Tillmans method with a solution of 2,6-dichlorophenolindophenol, according to AOAC method 967.21 (2000); pH by direct reading on a digital pH-meter (Labmeter) and titratable acidity by AOAC method 942.15 (1997). To determine the reaction order and its velocity constant, the values obtained for the % vitamin C degradation were plotted as a function of storage time, and linear regression was carried out corresponding to the values for k (reaction velocity) for each temperature and each reaction order (Eqs. (1) and (2)). equation(1) dAdt=k0 equation(2) dAdt=k1A In the integrated form and rearranged in the form of the equation of the curve, one obtains (Eqs. (3) and (4)): equation(3) A=-kt+A0A=-kt+A0 equation(4) lnA=-kt+lnAolnA=-kt+lnAo Eq. (5) was used to determine Q10 and Eq. (6) for the shelf life estimate.