Browsing by Author "Kennas, Abderrezak"

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Effect of pomegranate peel and honey fortification on physicochemical, physical, microbiological and antioxidant properties of yoghurt powder
(King Saoud University, 2020) Kennas, Abderrezak; Amellal-Chibane, Hayat; Kessal, Fetta; Halladj, Fatima
Consumers are focusing more and more on health benefits of functional products. The aim of this work is to formulate and characterize novel functional powder obtained by freeze-drying yoghurt supplemented concomitantly with pomegranate peel powder (0–10%) and honey (0–5%). In order to examine the powdered yoghurt, it was subjected to measurements of physicochemical, physical, microbiological and antioxidant properties. The experimental data of freeze-drying were fitted to four models and results showed that Page model was the most suitable thin-layer drying model according to R2 and RMSE as statistical comparison indexes. There was no significant difference (p > 0.05) among the powder samples in terms of moisture content and flow properties. The bulk and tapped densities values of yoghurt samples were slightly affected (p < 0.05) by the addition of pomegranate peel and honey. The results also demonstrated that powders particles exhibit an amorphous structure with mean diameter (D4.3) values that varied from 106.68 to 143.37 lm. Moreover, the addition of pomegranate peel and honey increased the glass transition temperature (Tg) value of yoghurt powder, and this could improve its stability during storage. Total lactic acid bacteria in all yoghurt powders remained over 107 cfu/g of dry matter after the freeze-drying. All the fortified yoghurt displayed higher phenolic contents and, consequently, exhibited higher antioxidant activities than control powder sample. It is concluded that, the freeze-drying of yoghurt with pomegranate peel and honey, at the fortification levels tested, is feasible, and the obtained powder has acceptable physicochemical and physical properties which could improve its shelf-life. Thus, the formulated yoghurt powder could be considered as a potential functional powder with antioxidant properties.
Evaluation of some biological activities of phenolic compounds obtained from two Algerian medicinal plants : mentha rotundifolia and satureja calamintha
(2020) Benfares, Redhouane; Boudjema, Khaled; Behlali, Hadjira; Imedjdouben, Imene; Kennas, Abderrezak; Fazouane, Fethia; Jaroslava, Švarc-Gajić
In this work phytochemical characterization of two medicinal plants from Lamiaceae family, Mentha rotundifolia and Satureja calamintha, has been carried out. Extracts obtained with different solvents were screened for different plant secondary metabolites and were biologically characterized by defining their antiradical and antibacterial activi-ties. Phytochemical screening of M. rotundifolia and S. calamintha confirmed their rich-ness in different secondary metabolites. The determination of phenolic compounds revea-led high polyphenols contents in water: methanol (30:70) extracts with concentrations of 20.64±1.74 mg EAG/g DW and 13.45±0.91 mg EAG/g DW for M. rotundifolia and S. calamintha, respectively. These extracts were also characterized by high concentrations of flavonoids (Mentha rotundifolia 12.33±1.58 mg EQ/g DW, Satureja calamintha 7.11±0.02 mg EQ/g DW). Furthermore, the water:methanol (30:70) extract of M. rotun-difolia was the most effective in inhibiting free radicals. Recorded inhibition diameters for both plant samples and tested microbial strains ranged from 6.66 mm to 13.66 mm. Presented results confirmed that tested indigenous Algerian plants are favorable sources of polyphenols with antioxidant and antimicrobial properties
Prevalence of malnutrition, dietary trends, and oral nutritional supplements use among Algerian cancer outpatients undergoing chemotherapy= Prévalence de la dénutrition, des tendances alimentaires et, de l'utilisation des compléments nutritionnels oraux, chez des patients algériens atteints de cancer en chimiothérapie ambulatoire
(Elsevier Masson s.r.l., 2024) Kennas, Abderrezak; Makhoukh, Saliha; Derrar, Kahina; Hadji, Katia
Objective: It is widely acknowledged that patients with cancer commonly experience malnutrition, and some individuals may adopt specific dietary trends. This study investigated the prevalence of malnutrition and dietary trends among Algerian cancer outpatients undergoing chemotherapy. Material and methods: This cross-sectional, descriptive study was conducted from January to October 2023 with 71 cancer outpatients undergoing chemotherapy. Malnutrition risk was evaluated using the Malnutrition Screening Tool (MST). The questionnaire also collected the occurrence of nutrition impact symptoms, the avoidance of specific food groups, and the use of oral nutritional supplements and dietary supplements. Results: Malnutrition risk was identified in 57.7% (41 cases) of participants. Nutrition impact symptoms were reported by 59.2% (42 cases) of patients. A total of 36 of the patients (50.7%) altered their eating habits by avoiding at least one food group. Among malnourished cancer outpatients, only five used oral nutritional supplements. Dietary supplements were used by 23.9% (27/71) of the patients after cancer diagnosis. Conclusion: Our findings underscore the necessity for a systematic malnutrition assessment in cancer patients. Qualified clinicians should provide nutritional awareness to enhance the quality of life for these patients.