Abstract
Investigating the kinetics of enzyme activities and browning indexes in food are very essential in understanding the enzyme inactivation and browning pigmentation reaction during drying processing. In order to understand and predict accurately the enzyme inactivation and browning pigmentation of banana slices using Relative Humidity (RH)-convective hot air dryer aided by ultrasound (US) pretreatment, this study was conducted. Drying was carried out with 20 kHz frequency of US-pretreatment using three durations (10 20 and 30 min) and RH (10 20 and 30%) conditions at 70 °C and 2.0 m/s air velocity. The kinetic study of both enzyme inactivation and browning pigmentation results were compared to their relevance of fit in terms of coefficient of correlation (R2), the root mean square error (RMSE) and the reduced chi-square (χ2). First order and second-order polynomial kinetic model fitted well for enzyme inactivation and browning indexes respectively. Both enzymes inactivation kinetics and enzymatic browning index (EBI) declined significantly (p < 0.05) with increasing drying time in all drying conditions and rate of decrease intensified in longer US-pretreatment duration and lower RH conditions. However, shorter US-pretreatment duration and higher RH conditions reduced the non- enzymatic browning index (NBI) significantly. Again, longer US-pretreatment duration and lower RH shortened the drying time but adversely created more microspores from the micrograph study. Longer US pretreatment and lower RH decrease significantly (p < 0.05) the L* and b* values whereas the a* values was increased.
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Abbreviations
- PPO:
-
Polyphenol oxidase
- POD:
-
Peroxidase
- AAO:
-
Ascorbic acid oxidase
- US:
-
Ultrasound
- MR:
-
Moisture ratio
- Eq.:
-
Equation
- M t :
-
Moisture content at a given time, t
- M 0 :
-
Initial moisture content
- DR:
-
Drying rate
- (RA):
-
Relative activity
- ∆E:
-
Total color difference
- BI:
-
Browning index
- EBI:
-
Enzymatic browning index
- NBI:
-
Non-enzymatic browning index
- RH:
-
Relative Humidity
- SEM:
-
Scanning electron microscopy
- R2 :
-
Coefficient of correlation
- RMSE:
-
Root mean square error
- χ 2 :
-
Reduced chi-square
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Acknowledgments
The authors are grateful for the support provided by the National Key Research and Development Program of China (2017YFD0400903-01, 2016YFD0400705-04), the Policy Guidance Program (Research Cooperation) of Jiangsu (BY2016072-03), the Social Development Program (General Project) of Jiangsu (BE2016779) and the Special Fund of Jiangsu Province for the Transformation of Scientific and Technological Achievements (BA2016169).
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Sarpong, F., Yu, X., Zhou, C. et al. Drying characteristic, enzyme inactivation and browning pigmentation kinetics of controlled humidity-convective drying of banana slices. Heat Mass Transfer 54, 3117–3130 (2018). https://doi.org/10.1007/s00231-018-2354-y
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DOI: https://doi.org/10.1007/s00231-018-2354-y