Predição e identificação de danos internos em batatas por meio do biospeckle laser / Prediction and identification of potatoes in internal damagethrough the laser biospeckle

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

15/06/2011

RESUMO

Food damages due to mechanical impacts at post harvest different phases are one of the biggest issues faced by food industry. In potatoes, productivity decrease due to impacts and physical damages can get to 40% during processing, storage, transportation and commercialization phases. Intern injuries, or bruising, are one of the biggest factors losses at potato production due to mechanical damages. Internal bruising is the surface damage darkening due to impact and it is a result of oxidation reactions associated to metabolic activities of some enzymes. There are techniques to measure and predict if an impact will be capable to generate an intern injury at potatoes, so that they are fundamental to define about adopt preventive control methods that can provide a loss production decrease and consequently product appreciation. The biospeckle laser technique is based in an interference optical phenomenon generated of a coherent light interaction with biological materials or dynamical systems. Digital treatment methods of the interference patterns can identify and quantify different activity levels in a tissue, such as tumors at animal cells or food damages. The biospeckle laser was adopted this work to predict bruising occurrence in non-visual moments of potato surface darkening due to controlled mechanical damages. Interference patterns were collected from an experimental configuration base on back-scattering and processed by numerical and graphical approaches. A pendulum was used as a device to create controlled impacts in potatoes samples. The activities in the regions next to local impacts, in the local damages and s well as in control samples without impacts were analyzed. Scott-Knott test was utilized to analyze data statistical and it was noted that capability of biospeckle laser technique to predict bruising in potato after 2 hours from impact occurrence. Comparison analysis between areas demonstrated the capacity to predict bruising occurrence even at regions out of the impact area. Techniques such as approaches graphical allowed creating maps of activities that unlike numerical approach, did not presented good results.

ASSUNTO(S)

internal bruising impactos mecânicos speckle engenharia agricola internal bruising mechanical impacts speckle

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