Optoelectronical systems for fresh-cut salads evaluation: A preliminary study

Antonella Lai, Federico Pallottino, Maria Sighicelli, Paolo Menesatti

Research output: Contribution to conferencePaper

Abstract

Fresh-cut salads is a globally developing segment of the vegetable industry that rapidly waste away. Thus, quality and appearance are crucial attributes for good conservation and appearance on shelf during the commercialization. The lack of non-destructive objective evaluation techniques suggest the importance of their development in this field. Aim of the study was to evaluate the use of optoelectronic techniques (colorimetric, spectral and chlorophyll fluorescence) in order to characterize the products when delivered to the wholesalers (packaged) and to establish the trend of the monitored parameters during conservation (shelf-life). The supplied samples of lettuce baby leaf (Lactuca sativa), escarole (Cichorium endivia var. latifolium) and rocket (Eruca sativa) were evaluated at different conservation times. Colorimetric and spectral data were acquired through a spectral image system. Spectral values were expressed in terms of relative reflectance (R) and elaborated through PLSDA (Partial Least Square Discriminant Analysis). The colorimetric comparison between TO and T3 shown correspondingly (L*a*b*) variations of: 8.17, 1.05 and 1.75% (baby leaf); 5.01, 2.05 and 2.9% (escarole); 9.82, 5.89 and 1.09 (rocket). The PLS-DA model produced good performances of correct classification among conservation times for baby leaf, escarole and rocket respectively equal to: 91.6, 83.3, 91.6% with respective errors in terms of RMSECV of 0.393, 0.377 and 0.2911. Chlorophyll fluorescence was measured by IMAGING-PAM Chlorophyll fluorometer. Photochemical parameters obtained from kinetic and light curves showed significant differences between salad samples during conservation time. Moreover emerges a correspondence between b* and Fv/Fm with r ranging from 0.64 to 0.75.
Original languageEnglish
Publication statusPublished - 2009
Externally publishedYes
Event5th International Technical Symposium on Food Processing, Monitoring Technology in Bioprocesses and Food Quality Management - , Germany
Duration: 1 Jan 2009 → …

Conference

Conference5th International Technical Symposium on Food Processing, Monitoring Technology in Bioprocesses and Food Quality Management
CountryGermany
Period1/1/09 → …

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All Science Journal Classification (ASJC) codes

  • Food Science

Cite this

Lai, A., Pallottino, F., Sighicelli, M., & Menesatti, P. (2009). Optoelectronical systems for fresh-cut salads evaluation: A preliminary study. Paper presented at 5th International Technical Symposium on Food Processing, Monitoring Technology in Bioprocesses and Food Quality Management, Germany.