Caracterização cinética da enzima polifenol oxidase, usando extrato bruto da casca de banana nanica (Musa acuminata)

Resumo (EN)

Introduction – Crude extract of the pell of stunded banana (Musa acuminata); the best source enzyme polyphenol oxidase (PPO) [EC.1.14.18.1] was studied as material biocatalitic for the aerobic phenolic substratum oxidation. Material and Methods – The extraction of the PPO of this source was studied. The activity of enzyme PPO and total protein had been determined in this extract. The study of the amount and the contact time of polymer SB-100 with this extract was done. The kinetic characterization of the PPO was determined with great temperature, stability to the heat, great pH of activity and stability. The gotten values had been compared with the PPO of the pulp of stunded banana. Results – The results had shown that the amount of polymer SB-100 was bigger used in the extract of the pell of stunded banana than the pulp, but the contact time did not have any alteration. The pH of activity (pH 6,0), of stability (pH 6,5) and the great temperature (30°C), had not presented variations comparing the two used extracts. Conclusions – It was verified, therefore that the use of the crude extract of the pell of stunded banana presented greater enzimatic activity of PPO than in the pulp of fruit; while the kinetic characterization practically did not vary in two extracts. We can conclude that for the construction of the biosensor the pell of the banana is better than the pulp for presenting greater activity of the enzyme. Next, a biosensor will be constructed, for detection of phenolics and the results will be compared with ones the pulp.