Palestra “Supercritical fluids applied to the production of natural extracts and functional foods: process design data”
Evento: 11th International Symposium on Supercritical Fluid Chromatography, Extraction, and Processing
Autores: Paulo T. V. Rosa, M. Angela A. Meireles, LASEFI – DEA / FEA (College of Food Eng) – UNICAMP (State University of Campinas)
Keywords: Functional foods, process design data, mass transfer parameters, supercritical fluid extraction, vegetable extracts
Brazil has a large biodiversity containing 55,000 from the 350,000 known species of plants in the world. This, associated to the fact that Brazil has tradition in agricultural production, can guarantee the availability of raw material in sufficient quality and cost. In spite of that, there is no industrial supercritical fluid extraction unit in Brazil or any of the South America countries (Meireles, 2003). Supercritical fluid extraction (SFE) is associated with high investment costs; nowadays, an easy method for technical-economical evaluation of supercritical fluid process is not available. Thus, a simple method to estimate the cost of manufacturing of extracts by supercritical fluid technology is needed. In this talk, we will present a rapid method to estimate the cost of manufacturing (COM) of extracts using supercritical fluid extraction that may accelerate the adoption of SFE as an alternative among the various extraction techniques. The required experimental information is discussed based on the 3 major areas of research in LASEFI – DEA / FEA – UNICAMP: phase equilibria (Souza et al, 2004; Rodrigues et al, 2002; Araújo et al, 2001), extraction kinetics [experimental (Rodrigues et al, 2003; Pereira, 2004; Sousa et al, 2002; Yoda et al, 2003) and modeling (Moura et al, 2004; Martínez et al, 2003; Canela et al, 2002; Ferreira and Meireles, 2002)], and functional properties of the extracts (Leal et al, 2003; Braga et al, 2003; Pereira et al, 2003; Soares et al, 2003). The validation of the experimental and calculation methodologies will be discussed (Rosa and Meireles, 2004). The method was illustrated by calculating the manufacturing cost of ginger oleoresin. The manufacturing cost of ginger oleoresin was close to its selling price at the extraction condition considered. This is mainly due to the strong influence of the investment on the cost of manufacturing ginger extracts by supercritical extraction due to the requirement of long extraction times. Nonetheless, some other characteristics of the ginger oleoresin such as the quantity and the availability of gingerols and shogaols should be considered (Zancan et al, 2002). A comparison of the functional properties of SFE extracts with extracts obtained by conventional process (steam distillation, low pressure solvent extraction, Soxhlet extraction and etc.) will be provided showing that indeed to produce ginger oleoresin with the required functional properties SFE is needed. In addition, the usage of the ginger bagasse to produce other chemicals can diminish the manufacturing costs (Moreschi et al, 2004).
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