Produção de agua de coco (cocus nucifera) utilizando membranas de micro e ultrafiltração de celulose, PES e PVDF / Coconut water processing using micro and ultrafiltration membranes of cellulose, PES and PVDF

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Coconut water is a natural drink. Lately, its consumption has been growing in both natural form and processed form, because of the coconut water health benefits. Processing methods are used, essentially, to inhibit the enzymes actions (polyphenoloxidase and peroxidase) that are responsible for coconut water color chage to rose and ensure its microbiological stability after the overture of the fruit, trying to maintain, as long as possible, its original sensory characteristics. Membrane separation processes, such as micro and ultrafiltration, stand out as alternative to conventional thermal treatment¿s processes, it acts as a selective permeable barrier to separate one or more solutes from a fluid including microorganisms. The aim of this work were evaluate the performance of five micro (MF) and ultrafiltration (UF) membranes in its permeate flux and the enzyme retention of coconut water, in laboratory an pilot unit, and also determine physicchemical characteristics of raw material, retentate and permeate to the essays in laboratory¿s unit. There were used Polyethersulfone 150 kDa (PES 150) and Polyvilidene fluoride 150 kDa (PVDF 150) MF membranes, Cellulose 10 kDa (CEL 10), Cellulose 30 kDa (CEL 30) and Polyethersulfone 10 kDa (PES 10) UF membranes. Process with PES 150 membranes presented better results to flux (144 ¿ 301 kg/m2.h, with pressures on 0,5; 1,5 e 2 bar) and enzyme retention. UF process CEL 30 membrane showed better results to flux (97 ¿ 102 kg/m2.h, with pressures on 2, 4 e 6 bar), but all UF membranes showed 100% of enzyme retention. All flux curves showed quite similar behavior, characterized by flux falling at the beginning and later stabilization. Physic-chemical analysis results, at most part of experimental procedures, showed an insignificant difference (p<0,05) among raw material, retentate and permeate regarding to total solids content, pH, titratable total acidity, reductor and total sugar. There was suspended solids reduction in all MF and UF process. As the CEL 30 membrane presented high flux values and 100% of enzyme retention, it was selected to pilot unit essay which flux values were high (288 kg/m2.h, on 2 bar) due to the tangential velocity¿s effect. The pattern based on surface renewal approach allows a good adjustment of experimental data (R2>0,8) to the majority of assays

ASSUNTO(S)

agua de coco microfiltração ultrafiltração polifenoloxidase peroxidase coconut water microfiltration ultrafiltration polyphenoloxidase peroxidase

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