Rapid Prediction of Microbial Load on Intact Mango Surface Using Spectroscopy

Pranita Jaiswal; Shyam Narayan Jha; K. Narsaiah; Rishi Bhardwaj

doi:10.52151/jae2014512.1547

Authors

Pranita Jaiswal Agricultural Structures and Environmental Control Division, Central Institute of Postharvest Engineering & Technology, Ludhiana-141004, India Author
Shyam Narayan Jha Agricultural Structures and Environmental Control Division, Central Institute of Postharvest Engineering & Technology, Ludhiana-141004, India Author
K. Narsaiah Agricultural Structures and Environmental Control Division, Central Institute of Postharvest Engineering & Technology, Ludhiana-141004, India Author
Rishi Bhardwaj Agricultural Structures and Environmental Control Division, Central Institute of Postharvest Engineering & Technology, Ludhiana-141004, India, Author

DOI:

https://doi.org/10.52151/jae2014512.1547

Keywords:

Microflora, near infrared spectroscopy (NIRS), multi-linear regression (MLR), partial least square

Abstract

Agriculture industries are continuously in search of new user friendly techniques for evaluating overall quality(microbial and biochemical) of fruits as per quarantine requirements. In the current study, the potential of visibleand near-infrared (NIR) spectroscopy in the wavelength range of 299-1100 nm and 900-1700 nm was evaluatedto determine total microbial population on the surface of seven major cultivars of mangoes collected from fourstates of India. NIR models were developed based on multiple-linear regression (MLR) and partial least square(PLS) regression employing pre-processing technologies (baseline correction, smoothening, multiplicative scattercorrection (MSC) and second-order derivatives). Wavelength range of 299-1100 nm was found to be more suitablefor determination of microbial load on the mango surface as compared to wavelength range of 900-1700 nm.PLS models were found to be the best with multiple correlation coefficients of 0.66 and 0.56, for calibration andvalidation, respectively, in the wavelength range 504.80-533.17 nm. The standard errors of calibration, predictionand differences in them were low, which demonstrated the potential of NIRS to predict microbial load on the surfaceof mango non-destructively in the wavelength range of 504.806-533.176 nm.

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