Papers by Mohamed Hammami
Food Chemistry, 2011
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Scientia Horticulturae, 2010
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International Journal of Food Science & Technology, 2012
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Cybium, 2007
... par Imen BOUHLEL (1), Amira MNARI (1), Imed CHRAIEF (1), Mohamed HAMMAMI (1), Mhamed EL CAFSI... more ... par Imen BOUHLEL (1), Amira MNARI (1), Imed CHRAIEF (1), Mohamed HAMMAMI (1), Mhamed EL CAFSI (2) & Abdelhamid CHAOUCH (1) R É SUM É. ... Une valeur du même rapport égale à 2 a été signalée par Belling et al. (1997) chez Lutjanus sebae et Choerodon albigera. ...
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Journal of the American College of Nutrition, Jan 20, 2015
A direct effect of process-induced trans-fatty acids (TFAs) on nonalcoholic fatty liver disease (... more A direct effect of process-induced trans-fatty acids (TFAs) on nonalcoholic fatty liver disease (NAFLD) as a cardiovascular disease (CVD) risk factor has previously been shown. We hypothesized that TFAs directly induced CVD. This article describes an investigation of the association between TFAs, provided by the consumption of oxidized soybean oil and margarine, and plasma lipid profiles, coronary artery lesions, and coronary fatty acids distribution in rats. Male rats were fed a standard chow or high-fat diet containing different TFA levels ranging from <1%, <2%, and >2% of total fat in fresh soybean oil, oxidized soybean oil, and margarine, respectively, for 4 weeks. The results indicated that the high-fat diets differently changed the plasma lipid profiles by significantlt increasing triglycerides, total cholesterol, low-density lipoprotein cholesterol, and the ratio of low-density to high-density lipoprotein cholesterol compared to control rats. Compared to fresh soybea...
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Journal of chromatographic science, Jan 4, 2015
This study reports a method for the analysis of mannitol, sorbitol and myo-inositol in olive tree... more This study reports a method for the analysis of mannitol, sorbitol and myo-inositol in olive tree roots and rhizospheric soil with gas chromatography. The analytical method consists of extraction with a mixture of dichloromethane:methanol (2:1, v/v) for soil samples and a mixture of ethanol:water (80:20) for root samples, silylation using pyridine, hexamethyldisilazane (HMDS) and trimethylchlorosilane (TMCS). The recovery of mannitol sorbitol and myo-inositol (for extraction and analysis in dichloromethane:methanol and ethanol:water) was acceptable and ranged from 100.3 to 114.7%. The time of analysis was <24 min. Among identified polyols extracted from rhizosphere and roots of olive plants, mannitol was the major compound. A marked increase in mannitol content occurred in rhizosphere and roots of water-stressed plants, suggesting a much broader role of mannitol in stress response based on its ability to act as a compatible solute.
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Atherosclerosis Supplements, 2011
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Cybium: international journal of ichthyology
... par Imen BOUHLEL (1), Amira MNARI (1), Imed CHRAIEF (1), Mohamed HAMMAMI (1), Mhamed EL CAFSI... more ... par Imen BOUHLEL (1), Amira MNARI (1), Imed CHRAIEF (1), Mohamed HAMMAMI (1), Mhamed EL CAFSI (2) &amp;amp; Abdelhamid CHAOUCH (1) R É SUM É. ... Une valeur du même rapport égale à 2 a été signalée par Belling et al. (1997) chez Lutjanus sebae et Choerodon albigera. ...
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Cybium: international journal of ichthyology
The aim of this work is to compare the effects on flesh lipids and fatty acids in farmed Sea bass... more The aim of this work is to compare the effects on flesh lipids and fatty acids in farmed Sea bass (Dicentrarchus labrax) of different cooking treatments: boiling, oven cooking and frying in corn oil (FWSO) and sunflower oil (FWCO). Fatty acid contents in muscle of fresh (control), boiled, oven cooked, FWSO and FWCO farmed Sea bass collected from Tunisian Station of Aquaculture (Hergla, Tunisia) were analysed. Total lipids were extracted with chloroform and methanol. Fatty acid methyl esters, obtained using KOH in methanol and hexane, were analysed using capillary gas chromatography. The descriptive statistics and one-way analysis of variance were conducted. The significance level was selected at p < 0.05. Our results revealed that raw farmed Sea bass was rich in polyunsaturated fatty acids (PUFA) n-3, particularly eicosapentaenoic (EPA) and docosahexaenoic acids (DHA), resulting from the abundance of these fatty acids in food. After boiling and oven cooking, total lipid decreased...
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Journal of Food Science Education
The fatty acid and mineral compositions in the dorsal and ventral muscles and liver of wild and f... more The fatty acid and mineral compositions in the dorsal and ventral muscles and liver of wild and farmed sea bass (Dicentrarchus labrax) were evaluated. The farmed animals showed a significant higher fat content (p < 0.05) than the wild ones, for all studied samples. The percentages of SFA and PUFA as well as the n-6/n-3 were higher (p < 0.05) in the muscle in wild compared with farmed sea bass. However, in liver, SFA and MUFA were concentrated in wild fish. Among n-3 PUFA both fish were good sources of EPA and DHA. The results revealed also that levels of trace elements varied depending on different tissues in both fish (p < 0.05). Potassium, calcium and magnesium were concentrated in muscles compared with liver, in both fish, whereas iron, zinc, copper and manganese concentrations were higher in liver than in muscle tissue (p < 0.05).
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Paralic ecosystems constitute a transition system between marine and continental fields. The Sfax... more Paralic ecosystems constitute a transition system between marine and continental fields. The Sfax Saltworks offer the advantage of being a paralic artificial system characterized by a particular hydrodynamism. These Saltworks extend on a littoral area of approximately 1500 ha. The biological settlement of this medium is diversified, with clear predominance of euryhalin species like Artemia. This species develops in the medium in spring and its spatial distribution is limited by the presence of predators and the high alinity of the medium. In this study, we will analyze the nutritive requirements of Artemia by the CPG lipid analysis and develop its potential application for aquaculture.
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SUMMARY Paralic ecosystems are transitional Systems between marine and continental areas. Thalass... more SUMMARY Paralic ecosystems are transitional Systems between marine and continental areas. Thalassohaline waters where brines are formed by evaporation of sea- water in land-locked bays or lagoons, such as sait pans or sait works, are représentative of thèse Systems. Except for the studies on the ecology and bio- geography of the brine shrimp Artemia, few attemps hâve been made to ana- lyze phyto- and zooplankton communities in sait works, especially those located in zones subject to arid conditions. Herein, we examined the seasonal dynamics of phyto- and zooplankton assemblages in a sait works located in the central area of the eastern coast of Tunisia (Sfax, ~36°N, 11°E), from August 1999 to May 2000, concurrently with a variety of environmental parameters. Phyto- and zooplankton communities were substantially diversi- fied and their dynamics were apparently in relation with the salinity in the pans and the resource availability. During the study, phytoplankton popula tions were q...
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Revue Des Sciences De L'Eau
Paralic ecosystems are transitional Systems between marine and continental areas. Thalassohaline ... more Paralic ecosystems are transitional Systems between marine and continental areas. Thalassohaline waters where brines are formed by evaporation of seawater in land-locked bays or lagoons, such as sait pans or sait works, are représentative of thèse Systems. Except for the studies on the ecology and biogeography of the brine shrimp Artemia, few attemps hâve been made to analyze phyto- and zooplankton communities in sait works, especially those located in zones subject to arid conditions. Herein, we examined the seasonal dynamics of phyto- and zooplankton assemblages in a sait works located in the central area of the eastern coast of Tunisia (Sfax, ~36°N, 11°E), from August 1999 to May 2000, concurrently with a variety of environmental parameters. Phyto- and zooplankton communities were substantially diversified and their dynamics were apparently in relation with the salinity in the pans and the resource availability. During the study, phytoplankton populations were quantitatively and ...
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Six Tunisian virgin olive oil (VOO) varieties, Chemlali Sfax, Chetoui, Chemchali, Oueslati, Zarra... more Six Tunisian virgin olive oil (VOO) varieties, Chemlali Sfax, Chetoui, Chemchali, Oueslati, Zarrazi and Zalmati, were characterised by two analytical methods. The gas chromatography allowed the determination of 14 fatty acids and squalene amounts. With fatty acids of each variety, a characteristic “morphotypes” for each oil variety was established. Chemlali Sfax and Zalmati showed strong similarities. Gas chromatography of fatty acid methyl esters (FAME) and near infrared (NIR) spectra of oils, associated to chemometric treatment, allowed the study of the inter-varietal variability and the verification of the variety origins of some Tunisian commercial VOOs. The specificity of Tunisian VOOs was evaluated by comparing the samples to Algerian, Moroccan and French Protected Designation of Origin VOOs. Classification in varietal origins by SIMCA used the FAME compositions and NIR spectra of the most represented varieties (Chemlali Sfax, Chetoui and Oueslati) showed a high potential to a...
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Food chemistry, Jan 15, 2015
Six Tunisian virgin olive oil (VOO) varieties, Chemlali Sfax, Chetoui, Chemchali, Oueslati, Zarra... more Six Tunisian virgin olive oil (VOO) varieties, Chemlali Sfax, Chetoui, Chemchali, Oueslati, Zarrazi and Zalmati, were characterised by two analytical methods. The gas chromatography allowed the determination of 14 fatty acids and squalene amounts. With fatty acids of each variety, a characteristic "morphotypes" for each oil variety was established. Chemlali Sfax and Zalmati showed strong similarities. Gas chromatography of fatty acid methyl esters (FAME) and near infrared (NIR) spectra of oils, associated to chemometric treatment, allowed the study of the inter-varietal variability and the verification of the variety origins of some Tunisian commercial VOOs. The specificity of Tunisian VOOs was evaluated by comparing the samples to Algerian, Moroccan and French Protected Designation of Origin VOOs. Classification in varietal origins by SIMCA used the FAME compositions and NIR spectra of the most represented varieties (Chemlali Sfax, Chetoui and Oueslati) showed a high pote...
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Genetics in medicine : official journal of the American College of Medical Genetics, 2010
The insertion/deletion polymorphism of angiotensin-converting enzyme may influence muscle propert... more The insertion/deletion polymorphism of angiotensin-converting enzyme may influence muscle properties. We examined whether Pompe disease clinical manifestations, which are known to be highly variable among late-onset patients, may be modulated by angiotensin-converting enzyme polymorphism. We included 38 patients with late-onset Pompe disease, aged 44.6 +/- 19.8 years. We compared the distribution of angiotensin-converting enzyme polymorphism according to demographic and disease parameters. The distribution of angiotensin-converting enzyme polymorphism was in line with the general population, with 16% of patients carrying the II genotype, 37% carrying the DD genotype, and the remaining patients with the ID genotype. The three groups did not differ in mean age, disease duration, Walton score, and other scores used to measure disease severity. The DD polymorphism was associated with earlier onset of disease (P = 0.041), higher creatine kinase levels at diagnosis (P = 0.024), presence o...
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Lipids in health and disease, 2005
Apolipoprotein A-V (Apo A-V) gene has recently been identified as a new apolipoprotein involved i... more Apolipoprotein A-V (Apo A-V) gene has recently been identified as a new apolipoprotein involved in triglyceride metabolism. A single nucleotide polymorphism (SNP3) located in the gene promoter (-1131) was associated with triglyceride variation in healthy subjects. In type 2 diabetes the triglyceride level increased compared to healthy subjects. Hypertriglyceridemia is a risk factor for coronary artery disease. We aimed to examine the interaction between SNP3 and lipid profile and coronary artery disease (CAD) in Tunisian type 2 diabetic patients. The genotype frequencies of T/T, T/C and C/C were 0.74, 0.23 and 0.03 respectively in non diabetic subjects, 0.71, 0.25 and 0.04 respectively in type 2 diabetic patients. Triglyceride level was higher in heterozygous genotype (-1131 T/C) of apo A-V (p = 0.024). Heterozygous genotype is more frequent in high triglyceride group (40.9%) than in low triglyceride group (18.8%); p = 0.011. Despite the relation between CAD and hypertriglyceridemia...
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Ageing research reviews, 2014
Ageing is accompanied by increasing vulnerability to major pathologies (atherosclerosis, Alzheime... more Ageing is accompanied by increasing vulnerability to major pathologies (atherosclerosis, Alzheimer's disease, age-related macular degeneration, cataract, and osteoporosis) which can have similar underlying pathoetiologies. All of these diseases involve oxidative stress, inflammation and/or cell death processes, which are triggered by cholesterol oxide derivatives, also named oxysterols. These oxidized lipids result either from spontaneous and/or enzymatic oxidation of cholesterol on the steroid nucleus or on the side chain. The ability of oxysterols to induce severe dysfunctions in organelles (especially mitochondria) plays key roles in RedOx homeostasis, inflammatory status, lipid metabolism, and in the control of cell death induction, which may at least in part contribute to explain the potential participation of these molecules in ageing processes and in age related diseases. As no efficient treatments are currently available for most of these diseases, which are predicted to...
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Journal of Alzheimer's disease : JAD, 2015
Several lipid metabolism alterations have been described in the brain and plasma of Alzheimer'... more Several lipid metabolism alterations have been described in the brain and plasma of Alzheimer's disease (AD) patients, suggesting a relation between lipid metabolism alteration and dementia. We attempted to identify blood fatty acids as biomarkers of dementia. Fatty acid profiles were established using gas chromatography with or without mass spectrometry on matched plasma and red blood cells (RBCs) of demented patients diagnosed with AD, vascular dementia, or other dementia, and compared with a control group of elderly individuals. The severity of dementia was evaluated with the Mini-Mental State Examination test. Fatty acid analysis showed significant variations of fatty acid levels in demented patients including AD patients. The highest plasma and RBC accumulation was found with hexacosanoic acid (C26:0). Our data also support that alterations of desaturase and elongase activities may contribute to cognitive dysfunction. The variations of fatty acid levels and the accumulation...
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Papers by Mohamed Hammami