INVESTIGADORES
ANDRADA Matias Fernando
artículos
Título:
Process for integral use of blueberry
Autor/es:
SOFIA PIZZOLATO; ANDRADA MATIAS; RINALDONI NOELIA; MERCEDES CAMPDERRÓS
Revista:
INTERNATIONAL JOURNAL OF FOOD ENGINEERING
Editorial:
BERKELEY ELECTRONIC PRESS
Referencias:
Año: 2012 vol. 8 p. 1515 - 1556
ISSN:
1556-3758
Resumen:
Blueberries, rich in anthocyanins, have long been recognized for their health
benefits as antioxidant, besides they have been studied for their potential as natural
colourants for food or cosmetics. The research develops a flow sheet which includes
several methods for processing blueberry to obtain different products. Membrane
technology was applied, as a non thermal alternative for obtaining a clarified juice in
the permeate stream and a blueberry concentrate in the other stream. An inorganic
microfiltration membrane Carbosep® was used into a tubular Plexiglas. .The
concentrate was dried by freeze-drying at -40°C and 1 bar. With the solids obtained
in the pre-treatment and during the filtration of the fruit, jams were elaborated with
the usual procedure, Different formulations were assayed: i) common grade with the
addition of sugar, and ii) using Stevia (rebaudiana Bertoni) as a natural sweetener.
The polysaccharide has many healthy properties in treating obesity and high blood
pressure. A physical-chemical and sensory analysis of fruits and derived products has
been carried out. The results showed that blueberries? clarified juice, presented
colour, flavor and pleasing appearance, the presence of anthocyanins could be
determined. The freeze-dried concentrate was stable, retaining a bright colour similar
to the fruit and can be quickly re-hydrated. The manufactured jams showed similar
characteristics to that of commercial products (pH: 3.5; soluble solids: 67.5 °Brix;
ash: 7.4 % w/w). The sensory analysis indicated that the formulation with sugar
/Stevia: 50-50%, was rated significantly better than mixtures 25-75% or 100% Stevia.
The process allows an integrated use of the fruit obtaining products with high quality.