Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/350304
Type: Artigo
Title: Drying of α-amylase by spray drying and freeze-drying - a comparative study
Author: de Jesus, S. S.
Maciel Filho, R.
Abstract: This study is aimed at comparing two traditional methods of drying of enzymes and at verifying the efficiency of each one and their advantages and disadvantages. The experiments were performed with a laboratory spray dryer and freeze-dryer using α-amylase as the model enzyme. An experimental design in star revealed that spray drying is mainly influenced by the inlet air temperature and feed flow rate, which were considered to be the main factors influencing the enzymatic activity and water activity; the long period of material exposure to high temperatures causes a partial activity loss. In the experiments of freeze drying, three methods of freezing were used (freezer, acetone and dry ice, and liquid nitrogen) and samples subsequently freeze-dried for times ranging between 0-24 hours. The product obtained from the two techniques showed high enzymatic activity and low water activity. For the drying of heat-resistant enzymes, in which the product to be obtained does not have high added value, spray drying may be more economically viable because, in the freeze drying process, the process time can be considered as a limiting factor when choosing a technique
Subject: Alfa-amilases
Country: Brasil
Editor: Associação Brasileira de Engenharia Química
Rights: Aberto
Identifier DOI: 10.1590/0104-6632.20140313s00002642
Address: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322014000300005
Date Issue: 2014
Appears in Collections:FEQ - Artigos e Outros Documentos

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