Effect of Cross-flow Microfiltration on Physico-chemical Quality of Clarified Pineapple Juice
A.M. Perez-Carvajal, M. Badilla, J. Moler, F. Vaillant, A.L. Perez and L. ernandez
Book of Book of Abstract.Information & technology for sustainable fruit & vegetable production, The 7th Fruit, Nut and Vegetable Production Engineering Symposium, 12-16 September 2005, Monpellier, France. Page 30
2005
บทคัดย่อ
Effect of Cross-flow Microfiltration on Physico-chemical Quality of Clarified Pineapple Juice
Costa Rica is a large producer of tropical fruits. At the present time, it is the major exporter worldwide of fresh pineapple.This success is due, in part, to one variety of pineapple-the MD-2TMor GoldenTM- which was introduced in the country in 1995. Also, the use of the rejected fruit from the agriculture export business is becoming a new alternativefor the Costa Rican fond industry. There is a growing demand from the consumers for natural products-products without additives -as well as an increasing trend towards clarified exotic fruit juice consumption. These facts provide a great opportunity for the application of membrane technology. In this study, we present the use of cross-Row microfiltration to obtain clarified pineapple(MD-2TM) juice. The assays were carried ant at a semi-industrial scale, with a pilot equipment at 30 °C using a tubular alumina membrane with an average pore diameter of 0.2µm. All samples were enzymatically pre-treated. The processes were ran at 200 kPa (transmembrane pressure) and the parameters analyzed were acidity, pH, turbidity, soluble solids, % ascorbic acid and % total carotenoids. Finally, the effectof clarification on the profile of volatile components was analyzed by Gas Chromatography coupled to Mass Spectrometry (GC-MS). The GoldenTM variety of pineapple presents higher sugar and vitamin C contents, as well as a lower acidity when compared to other varieties.The cross-flow microfiltration allowed to maintain the physico-chemical characteristics in the clarified pineapple juice, except for carotenoids, due to the fact that these pigments were retained by the ceramic membrane. The permeate fluxes(approximately 75 L. h-1.m-2)and the process’ yield when considering the clarified juice obtained (85%), are compatible with a possible industrial application.