, 2010, Karim and Wai, 1999 and Sankat and Castaigne, 2004). According to Moura, Berbari, Germer, Almeida, & Fefim (2007), the shelf life of a food is defined by the time for which the product, stored under determined temperature conditions, presents alterations considered, up to a certain point, acceptable by the manufacturer, consumer and current food legislation. Many products show prolonged shelf lives, making their experimental determination difficult. However, the

existence of accelerated shelf life tests represents an alternative, and consists of storing the product to be studied under defined and controlled environmental conditions, so as to accelerate the rates of transformation (García-García, López-López, & Garrido-Fernández, 2008). One way of evaluating the shelf life of a food is by establishing a quality index. For this purpose, the main quality parameters should be considered, as also the degree selleck screening library of deterioration necessary to establish the end of the shelf life (Sanjuán, Bom, Clemente, & Mulet, 2004). The shelf life depends on extrinsic factors such as processing, packaging properties, temperature and relative humidity of the environmental air, luminosity buy LBH589 and headspace conditions, as well as intrinsic factors of the food such as acidity, available oxygen, additives, level of microbial contamination, redox

potential and water activity (Escobedo-Avellaneda, Velazquez, Torres, & Welti-Chanes, NADPH-cytochrome-c2 reductase 2012). Some of the main parameters considered in predicting shelf life are colour, ascorbic acid content, moisture content and pH value (Arlindo et al., 2007, Galdino et al., 2003 and Gomes et al., 2004). Thus the objective of the present study was to evaluate the shelf life of powdered guavira pulp produced by a foam mat process, employing accelerated tests as a function of the ascorbic acid content. Guavira fruits were acquired in the town

of Bela Vista, MS, Brazil (Latitude −22° 06′ 32” and Longitude −56° 31′ 16”) and transported to the Food Technology Laboratory of the Faculty of Engineering/UFGD, Brazil. The fruits were selected according to their degree of ripeness and physical integrity, washed and sanitized with 0.66% sodium dichloroisocyanurate dehydrate (Sumaveg). After sanitization the fruits were immersed in water at 70 °C for 5 min, drained, manually crushed and the pulp separated from the seeds and skin. The pulp was then packaged in rigid polypropylene containers and stored at −22 °C until use. Guavira foam was produced by mixing 100 g pulp with 1% citric pectin, 2% Emustab (product based on distilled monoglycerides, sorbitan monostearate and polysorbate 60) and 1% Super Liga neutral (product based on sucrose, carboxymethylcellulose and guar gum) and agitated at 1,050 rpm for 20 min in a mixer (Black & Decker Power Pro) at room temperature.