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Proceedings Paper

Application of a LED-based reflectance sensor for the assessing in situ the lycopene content of tomatoes (Lycopersicon esculentum Mill.)
Author(s): Anna G. Mignani; Leonardo Ciaccheri; Andrea A. Mencaglia; Lorenza Tuccio; Giovanni Agati
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Paper Abstract

Nondestructive in situ determination of the antioxidant lycopene of fresh tomato fruits is of large interest for the growers, willing to optimize the harvest time for high quality products. For this, we developed a portable LED-based colorimeter which was able to measure reflectance spectra of whole tomatoes in the 400-750 nm range. The tomato skins from the same samples were then frozen in liquid nitrogen, extracted with an acetone/ethanol/hexane mixture and analyzed by means of a spectrophotometer for their lycopene content. Concentration of lycopene was varying between 70 and 550 mg/Kg fresh weight skin. Partial Least Square regression was used to correlate spectral data to the tomato lycopene content. The multivariate processing of the reflectance data showed that lycopene content could be nicely predicted with a coefficient of determination R2=0.945 and a root mean square error of cross-validation RMSECV=57 mg/Kg skin fresh weight. These results suggest that portable, low-cost and compact LED-based sensors appear to be promising instruments for the nondestructive assessment of tomato lycopene even in the field.

Paper Details

Date Published: 13 May 2015
PDF: 6 pages
Proc. SPIE 9488, Sensing for Agriculture and Food Quality and Safety VII, 948806 (13 May 2015); doi: 10.1117/12.2177896
Show Author Affiliations
Anna G. Mignani, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
Leonardo Ciaccheri, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
Andrea A. Mencaglia, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
Lorenza Tuccio, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
Giovanni Agati, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)


Published in SPIE Proceedings Vol. 9488:
Sensing for Agriculture and Food Quality and Safety VII
Moon S. Kim; Kuanglin Chao; Bryan A. Chin, Editor(s)

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