Research Abstracts

Ultrafiltration experiments for the optical resolution of racemic phenylalanine were investigated in a DNA solution system and by using immobilized DNA membranes. L-phenylalanine preferentially existed in the permeate solution and D-phenylalanine preferentially existed in the concentrate solution in

The wastes generated in the production of juice from citric fruits can become a great environmental problem if they are not managed correctly. Over the last years the European laws have become more restrictive about the pollution levels from industries. The environmental problem is directly related

The reverse osmosis (RO), as alternative to the chaptalization or vacuum evaporation, enables the must concentration if sugar concentration needs to be increased. The presented study shows the incidence of operating parameters of a RO industrial system to the quality of extracted water and to the en

In the sugar and starch industries, increasing constraints could require producers to significantly modify their manufacturing processes. As main trends, we can mention reduction of the environmental impact of these processes regarding liquid and solid waste discharge, potential alternatives to the

The use of poly (dimethyl siloxane) PDMS hollow fibres was investigated in orange juice aroma recovery. Modules for pervaporation were designed and built for this purpose, scrutinized with binary ester-water feeds and compared to other module geometries using experimental enrichment factors and mass

In the present work, it is evaluated the influence of temperature and transmembrane pressure on the crude soybean oil permeate flux through a ceramic tubular membrane (pore size 0.01 µm) and a polysulphone hollow fiber membrane (pore size 100 KDa). Temperatures and pressures values are 50, 60 and 70

Pineapple is a very appreciated tropical fruit due to its unique aroma and flavour. Pineapple juice was cold sterilised and clarified by crossflow microfiltration associated with an enzymatic treatment. A tubular polyethersulfone 0.3 µm pore size membrane with effective filtration area of 0.05 m2 wa

This work focuses on a non-destructive process for recovering valuable aromatic fractions from an odorous tomato industry aqueous effluent. Non-dispersive solvent extraction of four selected aroma compounds, chosen as key aroma, was, at first, carried out on very diluted model aqueous solutions. Mas

In the food industry, unit operations of stabilisation (such as blanching) produce aqueous effluents generally nonpolluting but often odorous. The objective of this study was to apply the pervaporation process to the deodorization of a cauliflower blanching effluent in order to reduce its volatile o

The results of preliminary experiments for the production of new tomato juices based on the introduction of a microfiltration (MF) stage before the reverse osmosis (RO) stage are reported. Ceramic multichannel membranes with an average pore size in the micrometer tenths were used in the MF stage to