[Microbiological and physicochemical evaluation of pasteurized nectar elaborated with tree tomato (Cyphomandra betaceae Sendth)pulp].
Tree tomato (Cyphomandra betaceae Sendth) is a species from high tropical regions. In Venezuela, it is cultivate at the Andean and Aragua state but its consumption is restricted as fruit-fresh, though it a nutritious and industrial potential due its provitamin A content. In this research four nectars were elaborated in proportion I L pulp/4 L of water (1:4) and addition of ascorbic acid (I: 0%; II: 0.5%; III: 1.0 y IV: 1.5%). The nectars were pasteurized (60 degrees C for 30 min), tuned into amber bottle, and stored under refrigeration conditions (7.0 +/- 1.0 degrees C). Weekly during 21 days the mesophilic bacteria, molds, yeasts, total coliforms (MPN/mL), pH, degree Brix, acidity, total carotenoids, vitamin C and total sugars were evaluated. The mesophilic bacteria content was < 200 UFC/mL for every formulation on the first day the evaluation, molds and yeasts were < 10 UFC/mL and the total coliforms (NPN/mL) < 3 until the third evaluation. No significant differences (P > 0.05) were founded on: pH. degree Brix and total sugars. Significant differences (P < 0.05) were founded in vitamin C and total carotenoids content. Sensorial analysis did not show significant differences between formulations for the smell and flavor attributes, when the color was discriminate during the evaluations. The formulation I (without acid ascorbic) had more preference due its color. In conclusion, the nectars showed useful life of 14-21 days under refrigeration condition storage due to the adequate physicochemical and microbiological quality of the product.
Moreno Alvarez
Mario José
MJ
Laboratorio de Biomoléculas, Ingeniería de Alimentos, Universidad Simón Rodríguez, Canoabo, Estado Carabobo, Venezuela.
Girán
Nathaly
N
Serrano
Karla
K
García
David
D
Belén Camacho
Douglas R
DR
D000975:Antioxidants; D001205:Ascorbic Acid; D001628:Beverages / Q000032:analysis / Q000382:microbiology; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D005511:Food Handling / Q000379:methods*; D018551:Solanum lycopersicum / Q000737:chemistry / Q000382:microbiology
D000975:Antioxidants; D001205:Ascorbic Acid