Publications Scientifiques

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Author: search.filters.author.Hamoudi-Belarbi, Latifa

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    Effectiveness of convective drying to conserve indigenous yeasts with high volatile profile isolated from algerian fermented raw bovine milk (Rayeb)
    (Sociedade Brasileira de Ciência e Tecnologia de Alimentos, 2016) Hamoudi-Belarbi, Latifa; Nouri, L’Hadi; Belkacemi, Khaled
    Yeasts Candida tropicalis, Yarrowia lipolytica, Wickerhamomyces anomalus, Issatchenkia orientalis, Kluyveromyces marxianus, Saprochaete suaveolens and Trichosporon coremiiforme were isolated and identified by physiological, biochemical tests with API 20C AUX system and molecular methods by restriction fragment analysis of PCR-amplified 28S-rRNA from Algerian fermented raw bovine milk (Rayeb). Selected yeasts S. suaveolens, I. orientalis, K. marxianus and W. anomalus produced esters and higher esters which can exert a pertinent influence on the sensory characteristics of Rayeb. Viability of S. suaveolens and W. anomalus using three methods of drying (freeze-drying, convective drying, and spray-drying) and during 4 months of storage at 4 °C and 25 °C in the darkness was studied. Immediately after each drying method, high survival was obtained using freeze-drying followed by convective drying in rice cakes and spray-drying respectively. During storage at 4 °C, convective drying provided better survival of yeast cultures of S. suaveolens and W. anomalus than freeze-drying. At 25 °C of storage, convective and freeze-dried yeast cultures showed no significant loss of viable cells up to 2 months of storage. Spray-dried yeast cultures had the greatest loss of viable count during the 3 months of storage at 25 °C
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    Combination of bioaugmentation and biostimulation as an oil-drilling mud contaminated soil bioremediation treatment
    (2019) Hamoudi-Belarbi, Latifa; Demdoum, Samira; Hamoudi, Safia; Medjras, Sadia
    The removal of oil-drilling mud contaminated soil generated from oilfields in the Algerian Sahara by bioaugmentation with Yarrowia lipolyticaand biostimulation with carrot peel waste amendment during 45 days was investigated. Initially, the evaluation of growth and gasoil degrading ability of Yarrowia lipolyticain carrot peel waste, and carob kibbles media were compared. Afterwards, the effect of bioaugmentation and organic amendment on oil-drilling mud contaminated soil was studied for 45days of study period.Total petroleum hydrocarbon (TPH) was measured by distillation using distiller mud. The results indicated that, higher augmentation in growth was observed in carrot peel waste medium and when the concentration of gasoil was increasedfrom 15% to 30%. TPH decreased to 35±1.66% and 30.60±1.50% the first 15 days, 33±2.30% and 26.8±1.66%,respectively at the end of study. TPH rate did not undergo any significant change from its initial value in the control for the entire period ofincubation. This study demonstrated the effectiveness of co-application of bioaugmentation with Yarrowia lipolyticaand biostimulation with carrot peel waste amendment for bioremediation of oil-drilling mud contaminated sites.