For building a biosensor, at least two enzyme sources can be employed. The pure enzyme has features with better selectivity
and low stability. Crude extract presents better stability and wrong selectivity. Thus, one intermediate condition
can be feasible joining both benefits of crude extract and pure enzymes. For that result, several procedures of extraction
and semi purification of polyphenol oxidase (PPO) enzyme from banana (Musa sp.) were studied. The results showed
that cleaned enzymatic extracts presented higher specific activities than crude extracts (2.8 up to 5.3 fold), despite the
total protein concentration diminishing from 27% up to 72%, indicating that polyphenol oxidase (PPO) enzyme was
preserved in them. The biosensors with 125 AU mL–1 containing cleaned enzymatic extracts performed better by grinding
or grinding plus sonication for 30 s. They were linear over the ranges of 5.9 × 10–6 mol·L–1 to 1.4 × 10–3 mol·L–1
and 7.9 × 10–8 mol·L–1 to 4.0 × 10–3 mol·L–1, respectively. The limit of Detection (LOD) was 5.9 × 10–6 mol·L–1 and 7.9
× 10–8 mol·L–1, respectively. The LOD obtained is adequate to adrenaline determination on blood and medicinal samples,
and were applied in medicinal samples with satisfactory results.
For building a biosensor, at least two enzyme sources can be employed. The pure enzyme has features with better selectivityand low stability. Crude extract presents better stability and wrong selectivity. Thus, one intermediate conditioncan be feasible joining both benefits of crude extract and pure enzymes. For that result, several procedures of extractionand semi purification of polyphenol oxidase (PPO) enzyme from banana (Musa sp.) were studied. The results showedthat cleaned enzymatic extracts presented higher specific activities than crude extracts (2.8 up to 5.3 fold), despite thetotal protein concentration diminishing from 27% up to 72%, indicating that polyphenol oxidase (PPO) enzyme waspreserved in them. The biosensors with 125 AU mL–1 containing cleaned enzymatic extracts performed better by grindingor grinding plus sonication for 30 s. They were linear over the ranges of 5.9 × 10–6 mol·L–1 to 1.4 × 10–3 mol·L–1and 7.9 × 10–8 mol·L–1 to 4.0 × 10–3 mol·L–1, respectively. The limit of Detection (LOD) was 5.9 × 10–6 mol·L–1 and 7.9× 10–8 mol·L–1, respectively. The LOD obtained is adequate to adrenaline determination on blood and medicinal samples,and were applied in medicinal samples with satisfactory results.
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