Extraction, Purification, Characterization, and Wound Healing Effects of Novel Prickly Pear (Opuntiaficus-indica (L.) Mill.) Heteropolysaccharides.

Background: The present study undertakes the purification of a novel polysaccharide from Tunisian prickly pear (Opuntiaficus-indica (L.) Mill.) rackets (PPPRs) and the determination of its physicochemical properties, structure, antibacterial and antioxidant properties, as well as its in vitro and in vivo wound healing potential. Methods: The PPPR was structurally analyzed by Fourier Transform Infrared Spectroscopy (FTIR) and UV/Visible Spectroscopy, revealing characteristic bands of polysaccharides. According to thin-layer chromatography (TLC), high-performance liquid chromatography (HPLC), and Gas Chromatography-Mass Spectrometry (GC-MS) analyses. Results: The crude PPPR is an heteropolysaccharide composed of glucose (62.4%), galactose (19.37%), mannose (10.24%), and rhamnose (7.98%), with an average molecular weight of 90.94 kDa. This novel polysaccharide exhibited notable antioxidant potential assessed by four different in vitro assays: the 2-diphenyl-1-picrylhydrazyl (DPPH) scavenging assay, ferric reducing power, ferrous chelating activity, and scavenging activity against 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid (ABTS). In addition, the PPPR displayed high antibacterial activities with a MIC of 2.5 mg/mL against Salmonella Typhimurium and Pseudomonas aeruginosa, cytocompatibility properties, and non-cytotoxicity. Subsequently, the effect of the PPPR on skin wound healing was studied in a diabetic rat model induced by alloxan, revealing a significant acceleration in the wound healing process. This acceleration was evidenced by the expedited recovery of the dermis, increased formation of blood vessels, and enhanced tissue granulation. Conclusion: Therefore, the findings offer fresh perspectives on the creation of a potentially efficient and promising racket polysaccharide-based therapy for the treatment of persistent diabetic wounds.

Encapsulated probiotic Lactiplantibacillus strains with promising applications as feed additives for broiler chickens.

Lactic acid bacteria (LAB), particularly Lactobacilli strains, represent a widely studied and promising group of probiotics with numerous potential health benefits. In this study, we isolated LAB strains from fecal samples of healthy broiler chickens and characterized their probiotic properties. Out of 62 initial isolates, five strains were selected for further investigations based on their antibacterial activity against pathogenic bacteria. These selected strains were identified as Lactiplantibacillus species. They exhibited desirable probiotic traits, including non-hemolyis, non-cytotoxicity, lack of antibiotic resistance, acid tolerance, auto-aggregation, and antioxidative potential. Encapsulation of these strains in alginate beads enhanced their survival compared to free cells, in stomach (69-87 % vs. 34-47 %) and intestinal (72-100 % vs. 27-51 %) juices, after 120 min exposure. These findings suggest that encapsulated Lactiplantibacillus strains could be used as feed additives for broiler chickens. Nevertheless, further studies are needed to set on their probiotic potential in vivo.

Effects of a Novel Lin Seed Polysaccharide on Beef Sausage Properties.

Functional ingredients are substances that offer health benefits beyond their nutritional value. A novel heteropolysaccharide, named Linum water soluble polysaccharide (LWSP) was purified from Linum usitatissimum L. seeds powder and identified, via TLC and NMR, as a polymer composite of α1-2-L-arabinose, ß1-2-D-xylose, ß1-2-D-mannose and α1-2-D-glucose. The effect of incorporating LWSP on the quality of beef sausages, stuffed into collagen casings after 15 days of storage at 4 °C, was evaluated for texture profile analysis, color, sensory analysis and oxidation attributes. The new sausages formulated with LWSP recorded good textural attributes via reduction of cohesiveness, hardness and chewiness and improved the sensory features, especially texture, color and general acceptability. In addition, substituting ascorbic acid, a synthetic antioxidant, via the biological ingredient LWSP, retarded lipid oxidation and improved the oxymyoglobin rate until 15 days of storage. LWSP was proved to be a good natural substituent to synthetic antioxidants that definitely improves the oxidation stability and quality of sausages.

Extraction, Characterization, and Structure of a Novel Heteropolysaccharide from Lepidium sativum and Its Effects on Wound Healing in Diabetic Rats.

The present study undertakes the extraction of a novel polysaccharide from Lepidium sativum (PLS) and the determination of its physicochemical composition and antioxidant properties, as well as its potential wound healing activity in alloxan-induced diabetic rats. This polysaccharide presented a lighter natural color, whose luminosity (L∗), red-green intensity (a∗), and blue-yellow intensity (b∗) were recorded at 63.26, 5.87, and 27.28, respectively. The PLS was structurally characterized by Fourier transform infrared (FT-IR) spectroscopy, UV spectrum, high performance liquid chromatography (HPLC), gas chromatography (GC), nuclear resonance magnetic (NMR), and high-pressure gel filtration chromatography. The FT-IR and UV spectra showed the characteristic band of polysaccharides. According to HPLC, the crude PLS is a heteropolysaccharide composed of glucose, xylose, and galactose. Results obtained by 1H NMR indicated that PLS consisted of three monosaccharide residues with α and ß anomers. This novel polysaccharide had an average molecular weight of 98.51 kDa and displayed potential antioxidant activities determined through three different assays: scavenging activity against 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid (ABTS), 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging assay, and reducing power. These results strongly support the beneficial effects of the PLS to accelerate wound healing in diabetic rats. Indeed, its application significantly increased wound contraction percentage (98 ± 1.11%) after 14 days of experiment. Furthermore, the histological assessment of the PLS-treated group demonstrated complete reepithelialized wounds by accelerating collagen synthesis. In general, the findings affirmed that PLS is efficient on wound closure in alloxan-induced diabetic rats.

Characterization of antimicrobial compounds obtained from the potential probiotic Lactiplantibacillus plantarum S61 and their application as a biopreservative agent.

This work aimed to characterize the antimicrobial compounds obtained from the potential probiotic Lactiplantibacillus plantarum S61, isolated from traditional fermented green olive, involved in their activity against fungi and bacteria responsible for food spoilage and poisonings. Their application as a biopreservative agent was also investigated. The culture of L. plantarum S61 showed substantial antifungal and antibacterial activity against yeasts (Rhodotorula glutinis and Candida pelliculosa), molds (Penicillium digitatum, Aspergillus niger, Fusarium oxysporum, and Rhizopus oryzae), and pathogenic bacteria (Listeria monocytogenes ATCC 19,117, Salmonella enterica subsp. enterica ATCC 14,028, Staphylococcus aureus subsp. aureus ATCC 6538, Pseudomonas aeruginosa ATCC 49,189), with inhibition zones > 10 mm. Likewise, the cell-free supernatant (CFS) of L. plantarum S61 showed an essential inhibitory effect against fungi and bacteria, with inhibition diameters of 12.25-22.05 mm and 16.95-17.25 mm, respectively. The CFS inhibited molds' biomass and mycelium growth, with inhibition ranges of 63.18-83.64% and 22.57-38.93%, respectively. The antifungal activity of the CFS was stable during 4 weeks of storage at 25 °C, while it gradually decreased during storage at 4 °C. Several antimicrobial compounds were evidenced in the CFS of L. plantarum S61, including organic acids, ethanol, hydrogen peroxide, diacetyl, proteins, and fatty acids. The protein fraction, purified by reversed-phase high-performance liquid chromatography (RP-HPLC), demonstrated important antifungal activity, in relation to the fraction with molecular weight between 2 and 6 kDa. L. plantarum S61 and its CFS, tested in apple and orange fruit biopreservation, demonstrated their protective effect against P. digitatum spoilage. The CFS exhibited effectiveness in reducing Salmonella enterica subsp. enterica ATCC 14,028 in apple juice. L. plantarum S61 and/or its bioactive compounds CFS represent a promising strategy for biocontrol against pathogens and spoilage microorganisms in the agro-industry.

Antioxidant and hepatoprotective effects of novel heteropolysaccharide isolated from Lobularia maritima on CCl4-induced liver injury in rats.

The aim of the present study was to investigate the extraction and the characterization of a novel heteropolysaccharide from Tunisian halophyte Lobularia maritima (LmPS). We were also interested in its antioxidant, anti-inflammatory, and hepatoprotective effects on carbon tetrachloride (CCl4)-induced liver injury in rats. LmPS physicochemical properties were evaluated by thin-layer chromatography (TLC), high-performance liquid chromatography (HPLC), thermogravimetric analysis (TGA), and UV absorption. According to TLC and HPLC results, LmPS was a heteropolysaccharide composed of glucose, galactose, and xylose. Its molecular weight was 130.62 kDa. This heteropolysaccharide was characterized by a significant antioxidant potential and was efficient against oxidative stress and CCL4-induced hepatotoxicity in rat Wistar models (n = 8) treated with a single dose of LmPS 250 mg/kg of body weight. This was evidenced by a significant increase in serum marker enzymes specially aspartate transaminase (AST), alanine transaminase (ALT), alkaline phosphatase (ALP), and lactate dehydrogenase (LDH). The cytokines released after stimulation of rats with LmPS showed high anti-inflammatory profiles with an increased rate of interleukine-10 (IL-10) with 0.03 pg/mL compared to animals treated only with CCl4. On the contrary, we noticed a decrease of the other cytokines (tumor necrosis factor α: TNF-α, interleukine-6: IL-6, transforming growth factor beta 1: TGF-ß1) with average concentration values of <0.2, 0.1, and 0.04 pg/mL, respectively. Besides, histopathological examinations revealed that CCl4 causes acute liver damage, characterized by extensive hepatocellular necrosis, vacuolization, and inflammatory cell infiltration, as well as DNA fragmentation. LmPS administration at a dose of 250 mg/kg resulted in a significant hepatoprotection, evidenced by a reduction of CCl4-induced oxidative damage for all tested markers. These findings eagerly confirmed that LmPS was effective in the protection against CCl4-induced hepatotoxicity and genotoxicity. It, therefore, suggested a potential therapeutic use of this polysaccharide as an alternative medicine for patients with acute liver diseases.

Bio-preservation Effect of Probiotic Lactiplantibacillus plantarum S61 Against Rhodotorula glutinis and Listeria monocytogenes in Poultry Meat.

The objective of this work is the study of the antifungal and antibacterial activity of Lactiplantibacillus plantarum S61 strains, isolated from traditional fermenting green olives against Rhodotorula glutinis UMP 22 and Listeria monocytogenes ATCC 19117, and its application in meat as bio-preservative agent. The cell-free supernatant (CFS) of Lpb. plantarum S61 shows high inhibition zones, which are 22.45 ± 0.49 and 17.75 ± 0.35 mm, against Rhodotorula glutinis and Listeria monocytogenes. The minimum fungicidal and bactericidal concentrations of the CFS obtained are 8% (v/v) and 10% (v/v), respectively. The competition assay, realized in liquid medium by co-culture of Lpb. plantarum S61 with Rho Rhodotorula glutinis and L. monocytogenes, led to inhibition percentages of 77.72% and 89.52%, respectively. However, the antimicrobial activity of Lpb. plantarum S61 was revealed a proteinaceous nature. Lpb. plantarum S61 strain allowed the reduction of L. monocytogenes in minced poultry meat during 7 days of storage at 4 °C. In addition, Lpb. plantarum S61 improved the physicochemical and color parameters of poultry minced meat. Lpb. plantarum S61 and/or its antimicrobial compounds can be applied as bio-preservative agent in meat product and food industry.

Antioxidant activities, functional properties, and application of a novel Lepidium sativum polysaccharide in the formulation of cake.

A novel heteropolysaccharide, named cress water soluble polysaccharide (CWSP), was purified from Lepidium sativum seeds. Antioxidant activities and functional properties were characterized thermally using thermal gravimetric analysis (TGA), and the differential scanning calorimeter (DSC) results of CWSP were evaluated. The total antioxidant capacity and the metal chelating activities of CWSP at 3 mg/ml were equivalent to 116.34 µg ascorbic acid and 62.57%, respectively. As for the CWSP that was used for the production of cakes, it was thermally stable, and it presented high water (WHC) and oil holding (OHC) capacities and good emulsion properties. The samples were prepared with different levels of CWSP (0.1. 0.3, and 0.5%) and analyzed during 15 days of storage at room temperature. The obtained results indicated that the addition of CWSP had a significant effect on the texture profile, leading to the increase in all parameters in terms of hardness, springiness, cohesiveness, adhesiveness, and chewiness. Moreover, the reformulation samples presented higher a* and lower L* and b* than the control sample. The sensory evaluation showed that the formulation of cake with 0.3% of CWSP was the most acceptable. Therefore, CWSP was shown to be a new alternative for improving the quality attributes, indicating potent antioxidant activities on the shelf life during the storage of bakery foods.

Polysaccharides in CO2 enriched Arthrospira platensis: Structure, physico-chemical properties, antioxidant and cytotoxicity activities and laser burn wound healing in rats.

This work was undertaken to determine the structural characteristics of polysaccharides extracted from CO2-enriched Arthrospiraplatensis (Spirulina Water Soluble Polysaccharide: SWSP), as well as its antioxidant activities, cytotoxic effects and laser burn wound healing in rats. This SWSP was structurally characterized by Scanning Electron Microscopy (SEM), Fourier-transformed infrared (FT-IR), X-ray diffraction (XRD), high-performance liquid chromatography (HPLC), and thin layer chromatography (TLC). This novel polysaccharide was found to have an average molecular weight of 6.21 kDa. It is a hetero-polysaccharide composed of rhamnose, xylose, glucose and mannose. According to XRD and FT-IR spectra, the SWSP showed a semi-crystalline structure. It is composed of 100 to 500 µm geometric shaped units with flat surfaces and it was found to inhibit the proliferation of human colon (HCT-116) and breast (MCF-7) cancers. This polysaccharide display potential antioxidant activities determined through three different assays: scavenging activity against 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid (ABTS), 2,2-Diphenyl-1-Picrylhydrazyl (DPPH) scavenging assay and ferric reducing antioxidant power assay (FRAP). Results strongly support the beneficial effects of the SWSP to accelerate wound healing in rats. Indeed, its application significantly increased tissue re-epithelization and remodeling phases, after 8 days of the experiment. Findings herein demonstrated that SWSP could be a novel auspicious source of natural wound healing closure and/or cytotoxic remedy.

A novel probiotic strain, Lactiplantibacillus plantarum LC38, isolated from Tunisian camel milk promoting wound healing in Wistar diabetic rats.

Antimicrobial and probiotic properties were sought in Tunisian raw camel milk. One hundred and forty strains were isolated for this purpose. Initially, a screening based on growth kinetics under gastrointestinal tract (GIT) conditions allowed us to select only one strain that showed good resistance to pH 3 and 5% bovine bile. This isolate named LC38 was assayed for its autoaggregation capacity, surface hydrophobicity, antibiotic sensitivity, haemolytic and antimicrobial activities. The findings revealed strain LC38 sensitivity to several antibiotics, no haemolytic activity and antimicrobial activities against six pathogenic bacteria with an inhibition diameter that varies between 28 and 43 mm. Furthermore, this study revealed that this strain had good autoaggregation characteristics after 18 h of incubation and a high surface hydrophobicity that enhanced its adhesion ability to epithelial cells and for biofilm formation. Strain LC38 was submitted to classical identification with API50CH and to 16S rRNA gene sequencing, which revealed that the strain could be allocated to Lactiplantibacillus plantarum. Analysis of the structural composition of strain LC38 by high-performance liquid chromatography (HPLC) and Fourier transform-infrared (FTIR) spectroscopy analysis showed that probiotic suspension contains organic acids (lactic acid, succinic acid and citric acids). The application of Lactiplantibacillus plantarum LC38 on wound site in a diabetic rat model enhanced significantly wound healing activity and accelerated the wound closure after 14 days of wound induction. Altogether, these results demonstrated that LC38 isolate from camel milk has a number of promising properties that make it a prominent candidate with strong wound healing potential presumably achieved through its antimicrobial activities.

Development and Evaluation of the Wound Healing Effect of a Novel Topical Cream Formula Based on Ginkgo biloba Extract on Wounds in Diabetic Rats.

Despite advances in diabetes care, impaired diabetic wound healing remains a significant clinical problem. The present study was aimed at developing a novel cream based on Ginkgo biloba extract and investigating its wound healing effect on full-thickness wounds in diabetic rats. The topical formulated oil-in-water emulsion-based cream contains Ginkgo biloba aqueous extract in an amount of about 1% to 5% as an active agent. The prepared formula was subjected to physicochemical assessment and pharmacotechnical characterization. Eighteen alloxan-induced diabetic rats completing full-thickness excisional skin wounds were randomly divided into three groups topically treated with either a normal saline (control group), the reference drug ("Cytol Centella cream®"), and cream based on the Ginkgo biloba extract. The response to treatment was assessed by macroscopic, qualitative, and quantitative histopathological analysis. The prepared formula showed good physicochemical properties. The rheological behavior of the prepared cream followed a non-Newtonian pseudoplastic pattern at different storage temperatures. The cream, which is a macroemulsion with uniform size distribution, remained stable for 6 months. Skin tolerance studies confirmed the compatibility of the cream with the skin. During the experimental trial, the cream based on the Ginkgo biloba-treated group showed significant improvements over the control and reference groups for both general wound appearance and healing dynamics. This increased rate of closure of wounds in diabetic rats was associated with increased collagen synthesis. Our findings showed that the cream could be a promising and innovative topical treatment with Ginkgo biloba extract for the management of acute diabetic wounds.

Structure Analysis and Antioxidant Activity of a Novel Polysaccharide from Katan Seeds.

In the present work, a novel water-soluble polysaccharide (LWSP) was purified from Katan seeds. Polysaccharide was structurally characterized by NMR spectroscopic analysis, thin-layer chromatography (TLC), high-performance liquid chromatography (HPLC), Fourier-transform infrared spectroscopy (FTIR) analysis, X-ray diffraction (XRD), and UV absorption. TLC and HPLC showed that LWSP was a polysaccharide consisted mainly of glucose, mannose, xylose, and arabinose. The FTIR spectrum and UV absorption proved polysaccharide characteristic of LWSP. According to XRD, LWSP presented a semicrystalline behavior. The molecular weight was estimated as 64.56 kDa. Results obtained through 13C and 1H nuclear magnetic resonance (NMR) indicated that LWSP is consisted of four monosaccharide residues with α and ß anomers. Physicochemical and antioxidant properties of LWSP were also investigated. Results revealed that LWSP exhibited interesting 1,1-diphenyl-2-picrylhydrazyl (DPPH) (IC50 = 4.48 mg/ml) and chelating activity (IC50 = 4.79 mg/ml), and it displayed moderate reductive capacities. Overall, the findings suggested that LWSP is a promising source of natural additives in various industries fields.

A novel Triticum durum Annexin 12 protein: Expression, purification and biological activities against Listeria monocytogenes growth in meat under refrigeration.

The present study was undertaken to investigate the expression, purification and biological activities of a novel Triticum durum Annexin 12 protein (TdAnn12). The findings indicated that the molecular weight of the purified TdAnn12 was estimated to 35 kDa. The purified TdAnn12 protein was modulated by, Methyl-jasmonate, and ethephon treatments. The purified TdAnn12 protein displayed good antimicrobial activities against 9 tested pathogenic bacteria. The antioxidant activities showed that TdAnn12 displayed an excellent DPPH scavenging ability with an IC50 of 8.33 µg/ml and a strong Beta-carotene bleaching inhibition after 120 min of incubation with an IC50 of 2 µg/ml the cytotoxic effects of the TdAnn 12 showed that HepG2 and MCF-7 were examined by MTT assay. The IC50 values were 250.35 and 400.25 µg/ml for HepG2 and MCF-7 cells, respectively. The inhibitory effects of this TdAnn12 was assessed in vivo against Listeria monocytogenes, inoculated in minced beef meat at 6.105 CFU/g amended with different concentrations of the purified TdAnn12 and stored at 4 °C for 21 days. Results showed an excellent inhibitory effect of TdAnn12 of this pathogenic bacterium at 4 °C. Overall, the TdAnn12 have potential application as active ingredients in food and pharmaceutical industry.

Characterization of Probiotic Properties of Antifungal Lactobacillus Strains Isolated from Traditional Fermenting Green Olives.

The aim of this work is to characterize the potential probiotic properties of 14 antifungal Lactobacillus strains isolated from traditional fermenting Moroccan green olives. The molecular identification of strains indicated that they are composed of five Lactobacillus brevis, two Lactobacillus pentosus, and seven Lactobacillus plantarum. In combination with bile (0.3%), all the strains showed survival rates (SRs) of 83.19-56.51% at pH 3, while 10 strains showed SRs of 31.67-64.44% at pH 2.5. All the strains demonstrated high tolerance to phenol (0.6%) and produced exopolysaccharides. The autoaggregation, hydrophobicity, antioxidant activities, and surface tension value ranges of the strains were 10.29-41.34%, 15.07-34.67%, 43.11-52.99%, and 36.23-40.27 mN/m, respectively. Bacterial cultures exhibited high antifungal activity against Penicillium sp. The cell-free supernatant (CFS) of the cultures showed important inhibition zones against Candida pelliculosa (18.2-24.85 mm), as well as an antibacterial effect against some gram-positive and gram-negative bacteria (10.1-14.1 mm). The neutralized cell-free supernatant of the cultures displayed considerable inhibitory activity against C. pelliculosa (11.2-16.4 mm). None of the strains showed acquired or horizontally transferable antibiotic resistance or mucin degradation or DNase, hemolytic, or gelatinase activities. Lactobacillus brevis S82, Lactobacillus pentosus S75, and Lactobacillus plantarum S62 showed aminopeptidase, ß-galactosidase, and ß-glucosidase activities, while the other enzymes of API-ZYM were not detected. The results obtained revealed that the selected antifungal Lactobacillus strains are considered suitable candidates for use both as probiotic cultures for human consumption and for starters and as biopreservative cultures in agriculture, food, and pharmaceutical industries.

Structure and biological activities of polysaccharide purified from Senegrain seed.

A polysaccharide named Senegrain Water-Soluble Polysaccharide (SWSP) was extracted and purified from Senegrain seeds. The physicochemical properties of SWSP were evaluated by Thin-layer chromatography (TLC), High Performance Liquid Chromatography (HPLC), Scanning Electron Microscopy (SEM), and Differential Scanning Colorimeter (DSC). TLC results showed that SWSP is a gluconic acid polymer. It had a network with a large number of cavities. This polysaccharide with a semi-crystalline structure has an average molecular weight of 47.42 kDa. On other trend, obtained data exhibited potent antidiabetic and antibacterial activities of SWSP. Additionally, the antioxidant activities of SWSP were studied in vitro, and demonstrated that this polymer displayed an interesting ABTS radical scavenging activity as well as a protective effect on the hydroxyl radical-induced DNA damage. The effects of SWSP on oxidative processes in minced raw beef during refrigerated (4 °C) storage were investigated. The results proved that SWSP decreased the TBARS value and inhibited the MetMb accumulation during the period of refrigeration storage. Overall, the finding demonstrated the potential applications of SWSP in food industries.

Purification, composition and biological activities of a novel heteropolysaccharide extracted from Linum usitatissimum L. seeds on laser burn wound.

The present study investigates the purification, structure and in vitro antioxidant activities of a novel water soluble polysaccharide (LWSP) extracted from Linum usitatissimum L. seeds and evaluates the in vivo wound healing performance on CO2 laser fractional burn in a rat model. LWSP is a heteropolysaccharide that consists of glucose, mannose, xylose and arabinose. Three different tests were used to evaluate the antioxidant activity of this carbohydrate. The scavenging activity against 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS) radical at a concentration of 5 mg/ml was 99.77%. The total antioxidant capacity of LWSP at 12 mg/ml was equivalent to 166.61 µg acsorbic acid. LWSP displayed a high protection effect against DNA damage induced byhydroxyl radical. No hemolytic activity was observed towards human erythrocytes. LWSP was tested in functional properties. The results showed good emulsion properties and high water (WHC) and oil holding (OHC) capacities (11.23 and 1.05%, respectively). In addition, the application of LWSP on the burn wound site in rat model increased significantly the percentage of burn contraction (98.6%) after 8 days of injury. According to the histological assessment, the LWSP-treated group had a higher content of hydroxyproline (846. 67 ±â€¯92.28 mg/g tissue) than the other groups. Overall, the findings demonstrate that the application of this novel LWSP may open promising opportunities for burn wound healing in modern medicine.

Stress associated protein from Lobularia maritima: Heterologous expression, antioxidant and antimicrobial activities with its preservative effect against Listeria monocytogenes inoculated in beef meat.

Stress associated Protein from Lobularia maritima (LmSAP) transcripts showed up-regulation in response to wounding, Methyl-jasmonate acid, Picolinic acid, and ethephon treatments. The antioxidant activities of the purified LmSAP protein were evaluated using various in vitro and in vivo assays. LmSAP has an excellent DPPH scavenging ability and exhibits notable reducing power capacity and led to a decrease in TBARS values. The LmSAP showed an important antimicrobial activity against different pathogenic strains tested. In fact, the Inhibition Zone (IZ), Minimal Inhibitory Concentration (MIC) and The Minimum Bactericidal Concentration (MCB) recorded were in the range of 14-22 mm, 62-250 µg/ml and 125-250 µg/ml, respectively. The LmSAP protein successfully inhibited the growth of L. monocytogenes in minced beef meat. Furthermore, the LmSAP enhanced the sensory acceptability extending the shelf life of minced beef meat. Overall, the finding demonstrates that the application of LmSAP may open new promising opportunities for the prevention of bacterial contamination, particularly L. monocytogenes, during minced beef meat storage.

Incorporation of probiotic strain in raw minced beef meat: Study of textural modification, lipid and protein oxidation and color parameters during refrigerated storage.

The aim of this work was to evaluate the effect of different concentrations of probiotic strain Lactobacillus plantarum TN8 on the quality and safety of raw minced beef after 10 days of refrigerated storage. The obtained results showed that the incorporation of the probiotic strain can inhibit the proliferation of spoilage microorganisms, such Listeria monocytogenes and Salmonella spp., delay the lipid oxidation, improve texture parameters, and extend the shelf life of these products during storage. We also examined the correlations between protein and lipid oxidation, texture profile and color parameters of raw minced beef meat inoculated with L. plantarum TN8. The incorporation of strain at 108 CFU/g resulted in better quality inclusive color, lipid oxidative stability, and texture parameters notably cohesiveness, adhesiveness, hardness and chewiness. Overall, the findings demonstrated that TN8 can be used as a biopreservative agent for extending the safety and quality of refrigerated raw minced beef meat.

Novel Sorghum bicolor (L.) seed polysaccharide structure, hemolytic and antioxidant activities, and laser burn wound healing effect.

This work was undertaken to determine the structural characteristics of a novel polysaccharide, Sorghum Water-Soluble Polysaccharide (SWSP), extracted from Sorghum (Sorghum bicolor (L.)) seeds and to assess its in vitro hemolytic and antioxidant activities as well as its in vivo wound healing ability to treat burns induced by fractional CO2 laser. Results obtained by 13C, 1H and HSQC Nuclear magnetic resonance (NMR) indicated that SWSP showed the characteristic bands of polysaccharides. Scanning electron microscopy of SWSP showed a rough surface with numerous cavities. SWSP exhibited strong antioxidant activities determined through three different assays: ferrous chelating activity, reducing power and DNA nicking. Also, no hemolytic activity was detected towards human erythrocytes. On the other hand, the application of SWSP hydrogel on the burn site in a rat model significantly improved wound appearance and accelerated the wound closure after 8 days of induction. Histological assessment of biopsies also demonstrated complete re-epithelialized wounds with a full epidermal regeneration. Thus, SWSP hydrogel which was efficient on wound closure might be useful as a wound healing agent in modern medicine.

Physicochemical, techno-functional, and antioxidant properties of a novel bacterial exopolysaccharide in cooked beef sausage.

This work investigates the effects of partial replacement of vitamin C (Vit C) with a purified exopolysaccharide (EPS-Ca6) produced by Lactobacillus sp. Ca6, on the antioxidant activities of cooked beef sausages during refrigerated storage. The physicochemical, techno-functional and viscosity properties of EPS-Ca6 were also studied. Functional properties of EPS-Ca6 were determined based on Water Holding Capacity (WHC), Oil Holding Capacity (OHC), emulsification activity, and foaming ability. EPS-Ca6 demonstrated excellent emulsifying and emulsion stabilizing properties. It was able to emulsify several food-grade oils and hydrophobic compounds, particularly corn oil and diesel with emulsification indexes of 90 and 100%, respectively at a concentration of 0.5%. The effect of EPS-Ca6 on oxidative processes in cooked beef sausages during storage up to 12days at 4°C was evaluated. The obtained results showed a high rate (p<0.05) of oxymyoglobin (OxyMb) and low lipid oxidation. Overall, our findings provided evidence that EPS-Ca6 could be used as a natural additive for maintaining storage stability of cooked beef sausages, and could replace synthetic polymer in several industrial applications.