design of automatic control system for the precipitation of bromelain from the extract of pineapple wastes
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ID: 249701
2010
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Abstract
In this work, bromelain was recovered from ground pineapple stem and rind by means of precipitation with alcohol at low temperature. Bromelain is the name of a group of powerful protein-digesting, or proteolytic, enzymes that are particularly useful for reducing muscle and tissue inflammation and as a digestive aid. Temperature control is crucial to avoid irreversible protein denaturation and consequently to improve the quality of the enzyme recovered. The process was carried out alternatively in two fed-batch pilot tanks: a glass tank and a stainless steel tank. Aliquots containing 100 mL of pineapple aqueous extract were fed into the tank. Inside the jacketed tank, the protein was exposed to unsteady operating conditions during the addition of the precipitating agent (ethanol 99.5%) because the dilution ratio "aqueous extract to ethanol" and heat transfer area changed. The coolant flow rate was manipulated through a variable speed pump. Fine tuned conventional and adaptive PID controllers were on-line implemented using a fieldbus digital control system. The processing performance efficiency was enhanced and so was the quality (enzyme activity) of the product.
| Reference Key |
silva2010fooddesign
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| Authors | ;Flavio Vasconcelos da Silva;Regina Lúcia de Andrade dos Santos;Tatiana Lie Fujiki;Manuela Souza Leite;Ana Maria Frattini Fileti |
| Journal | software - practice and experience |
| Year | 2010 |
| DOI |
10.1590/S0101-20612010000400031
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