Microstructure analysis of crust during deep-fat or hot-air frying to understand French fry texture

Gouyo Teko, Rondet Eric, Mestres Christian, Hofleitner Céline, Bohuon Philippe. 2021. Microstructure analysis of crust during deep-fat or hot-air frying to understand French fry texture. Journal of Food Engineering, 298:110484, 10 p.

https://doi.org/10.1016/j.jfoodeng.2021.110484

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Q1, Sujet : ENGINEERING, CHEMICAL / Quartile : Q1, Sujet : FOOD SCIENCE & TECHNOLOGY

Résumé : This study aimed to identify the microstructural parameters of the crust which can explain the crispness of French fries. The French fry microstructure was visualized by X-ray micro-computed tomography (XMT). Analysis of the images provided information on the pore size distribution, global porosity of the French fries and local porosity of the crust region. The results revealed that prefrozen French fries do not practically undergo any volume shrinkage during frying. The total porosity created in French fries corresponds to the volume of water loss during frying. The difference between hot-air fried and deep-fat fried French fries was mainly related to the pore diameter and pore size distribution in the crust. Principal component analysis between the sensory and morphometric parameters showed that the volume of small pores (diameter < 0.15 mm) and the span of the pore size distribution in the first millimetres of the crust correlated with the crispness of the product (r > 0.85, P value < 0.05). Thus, a French fry is crispier if the pores generated in the crust have a small median diameter (diameter < 0.2 mm), as well as a large dispersion of pore diameters.

Mots-clés Agrovoc : frite, friture, retrait

Mots-clés géographiques Agrovoc : France

Mots-clés libres : French fries, Crispness, Crust microstructure, X-ray micro-computed tomography, Sensory analysis

Agences de financement hors UE : Groupe SEB, Association Nationale de la Recherche et de la Technologie, Centre de Coopération Internationale en Recherche Agronomique pour le Développement

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