Some characteristics of polyphenol oxidase purified from edible yam (Dioscorea cayenensis-rotundatacv.Longbô) cultivated in Côte d’Ivoire

2009 ◽  
Vol 44 (10) ◽  
pp. 2005-2012 ◽  
Author(s):  
Sophie Nadège Gnangui ◽  
Sebastien Lamine Niamké ◽  
Lucien Patrice Kouamé
2019 ◽  
pp. 1-10
Author(s):  
Aïssatou Coulibaly ◽  
Kouadio Claver Degbeu ◽  
Abo Paul Marcelin Bekoin ◽  
Yapi Elisée Kouakoua ◽  
Kingsley Kwadwo Asare Pereko ◽  
...  

Aim: To prevent enzymatic browning during the freezing of yam slices of the Kponan variety (Dioscorea cayenensis-rotundata). Study Design: The experimental set-up was of a completely randomized design. Place and Duration of Study: Department of Food Science and Technology, Food Biochemistry and Tropical Products Technology Laboratory (BATPTL), University of Nangui Abrogoua, Abidjan, Côte d’Ivoire, between August and December 2018. Methodology: For this purpose, yam slices were either pretreated with a natural agent (lemon juice solution at different pH) or pretreated and blanched (85 °C for 2 min) and then packed in plastic bags and kept in the freezer at -18°C over a period of 4 weeks. Polyphenoloxidase and Peroxidase activities, Dry matter, rate of browning and sensory attributes of yam slices were determined. Results: The results showed a decrease in polyphenoloxidase and peroxidase activities regardless of the treatment. The largest decreases in activity were observed in yam slices that were both pretreated and blanched compared to the control (about 53.49% decrease in the specific activity of the PPOs and 51.46% of POD). The combination of pretreatment and blanching also resulted in lower dry matter yam slices compared to pretreated slices only. After 1 month of storage in the freezer, the lower rates of loss (browning) were recorded for the slices of yams that were both pretreated and blanched compared to the other methods which had very high losses. The pretreated and blanched slices had high dry matter content. The sensory profile of slices processed by the combined technique after one month of freezing had a good appreciation for all sensory characteristics of yam. Conclusion: In order to have a good product, the combined method is recommended for better freezer storage of yam slices.


2021 ◽  
Vol 158 ◽  
pp. 16321-16339
Author(s):  
Coulibaly Aïssatou ◽  
Kouadio Degbeu Claver ◽  
Doh Amenan Aline ◽  
Amani N’Guessan Georges

Objectif : Évaluer l’impact de la congélation sur certains paramètres physico-chimiques des tranches d’ignames de la variété kponan et faire une analyse sensorielle de quelques mets dérivés. Méthodologie et résultats : L’étude a été faite sur des tranches d’ignames prétraitées puis congelées pendant 3 mois. À Chaque mois, des échantillons ont été prélevés pour une analyse des paramètres physicochimiques et sensorielle des mets dérivés. La congélation n’a pas eu d’effet sur les teneurs en fibre, en protéine et en cendre. Cependant, au cours du premier mois, la matière sèche a augmenté de 5,59 %. Une augmentation des sucres réducteurs a été également observée. Tandis que la teneur en amidon a diminué de 5,54 %. A partir du deuxième mois, tous les paramètres physico-chimiques étudiés sont demeurés stables. Le profil sensoriel des mets dérivés a montré une bonne appréciation des caractéristiques sensorielles avec une forte élasticité (foutou) et une augmentation de la croustillance, de la fermeté et de la couleur (frite). Conclusion et applications des résultats : La technologie utilisée au cours de cette étude a permis de conserver la majeure partie des caractéristiques physico-chimiques et sensorielles de l’igname durant 3 mois. La production de tranches d’igname congelées doit être envisagée afin de palier le problème de conservation post-récolte, assurer la disponibilité tout au long de l’année permettant d’assurer la sécurité alimentaire et contribuer ainsi à la lutte contre la pauvreté en milieu rurale. Coulibaly et al., J. Appl. Biosci. 2021 Étude de la stabilité de quelques propriétés physico-chimiques des tranches d’igname congelées (Dioscorea cayenensis-rotundata cv Kponan) de Côte d’Ivoire et analyse sensorielle des mets dérivés 16322 Study of the stability of some physicochemical properties of frozen yam slices (Dioscorea cayenensis-rotundata CV Kponan) from Côte d'Ivoire and sensory analysis of derived dishes ABSTRACT Objective: Evaluate the impact of freezing on certain physicochemical parameters of yam slices of the kponan variety and make a sensory analysis of some derived dishes. Methodology and results: The study was performed on slices of pretreated yams and then frozen for 3 months. Each month, samples were taken for an analysis of the physico-chemical and sensory parameters of the derivative dishes. Freezing did not affect fiber, protein, and ash contents. However, in the first month, dry matter increased by 5.59%. An increase in reducing sugars was also observed. While the starch content decreased by 5.54%. From the second month, all the physico-chemical parameters studied remained stable. The sensory profile of the derived dishes showed a good appreciation of the sensory characteristics with high elasticity (foutou) and an increase in crispness, firmness, and color (fried). Conclusion and application of the results: The technology used during this study made it possible to conserve most of the physico-chemical and sensory characteristics of the yam for 3 months. The production of frozen yam slices should be considered in order to overcome the post-harvest conservation problem, ensure availability throughout the year, ensuring food security and thus contributing to the fight against poverty in the environment. rural.


2017 ◽  
Vol 107 (1) ◽  
pp. 10471
Author(s):  
Koffi honore Kouame ◽  
Kouablan Edmond Koffi ◽  
Kouadio Ignace Kouassi ◽  
Kan Modeste Kouassi ◽  
Abou Bakari Kouassi ◽  
...  

2019 ◽  
Vol 13 (4) ◽  
pp. 369-374
Author(s):  
A. Yao ◽  
A. Hué ◽  
J. Danho ◽  
P. Koffi-Dago ◽  
M. Sanogo ◽  
...  

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