Stability/activity features of the main enzyme components of rohapect 10L |
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Authors: | Lucas Dal Magro Jakub F Kornecki Manuela P Klein Rafael C Rodrigues Roberto Fernandez-Lafuente |
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Institution: | 1. Department of Biocatalysis, ICP-CSIC, Campus UAM-CSIC, Cantoblanco, Madrid, ZC, Spain
Biotechnology, Bioprocess and Biocatalysis Group, Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil;2. Department of Biocatalysis, ICP-CSIC, Campus UAM-CSIC, Cantoblanco, Madrid, ZC, Spain;3. Department of Nutrition, Federal University of Health Sciences of Porto Alegre (UFCSPA), Porto Alegre, RS, Brazil;4. Biotechnology, Bioprocess and Biocatalysis Group, Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil |
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Abstract: | Rohapect 10L is an enzyme cocktail commercialized for juice clarification. Here, we characterized the activity and stability of five enzymatic activities present in this cocktail: total pectinase (PE), polygalacturonase (PG), pectin lyase (PL), pectin methyl esterase (PME), and total cellulase (CE) activities. All these enzyme activities have the maximum activity and stability at pH 4, conditions near those found in most fruit juices. However, if the enzymes need to be handled under different conditions (e.g., to immobilize them), their stability becomes extremely low in some cases, just at pH values slightly higher than the optimal one. For example, at pH 10 only CE was reasonably stable at 25°C, while many other enzyme activities were rapidly almost inactivated, even at 4°C. For these cases, different additives were evaluated, and we found that polyethylene glycol was positive or very positive for all enzyme stabilities, allowing keeping reasonable activities after several hours at pH 10 and 25°C. Another additive, that is, dextran, has a small positive effect for PE, PG, and CE, and a very positive effect for PL, albeit significantly destabilizing PME. Thus, the handling and use of this extract requires some care when is performed out of optimal conditions. |
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Keywords: | cellulosic enzymes enzyme cocktail activity enzyme cocktail stability pectinolytic enzymes stabilization of enzyme activities stabilizing additives |
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