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We aimed to investigate 12-week-Zumba training effects on physical and psychological parameters, and quality of life (QoL) in postmenopausal women. Forty-two postmenopausal women were randomly allocated to a control group or a Zumba group (ZG). Postural balance, lower limb strength, mood level, and QoL were assessed before and after the 12-week-Zumba training. The ZG showed significantly better balance performances under all conditions such as on firm and foam surfaces with opened and closed eyes as well as improvements in limb strength, mood and QoL compared to their baselines. Thereby, 12-week-Zumba training was effective in improving postural balance, limb strength, mood and, QoL in postmenopausal women.
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Força Muscular , Qualidade de Vida , Feminino , Humanos , Pós-Menopausa , Envelhecimento , Extremidade Inferior , Equilíbrio PosturalRESUMO
This study aimed to investigate the effect of 12-week Zumba dancing on postural control and cognitive parameters and the correlations between these parameters in middle-aged women. Thirty-eight women, aged between 50 and 60 years, were randomly allocated to a Zumba group (ZG) or control group. Postural control and cognitive functions [working memory (WM) and reaction time (RT)] were assessed before and after 12 weeks of a Zumba dancing program using a stabilometric force platform, Corsi Block-Tapping Task and Simple RT tests, respectively. The results indicate that ZG showed significantly (p<.01) better balance performances when standing on a stable surface in both visual conditions [firm surface with eyes opened (EO) (20,9%) and eyes closed (EC) (12.3%)]. However, when standing on an unstable surface in both visual conditions (foam surface with EO/EC), the ZG showed no significant improvement in postural control. It seems that the benefits of Zumba on postural control depend on the sensory condition. Besides, 12-week Zumba dancing was not sufficient to significantly enhance cognitive performances (RT/WM) performances. These cognitive performances were related to postural control in challenging conditions and can be considered an effective tool for monitoring postural performances following an intervention program. Clinicians should, therefore, focus on interventions that boost cognitive functions in middle-aged women to achieve optimal postural control, mainly in challenging conditions, in order to prevent the risk and fear of falls as well as the incidence of falling.
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Cognição , Dança , Memória de Curto Prazo , Equilíbrio Postural , Humanos , Feminino , Pessoa de Meia-Idade , Dança/fisiologia , Dança/psicologia , Tempo de ReaçãoRESUMO
BACKGROUND AND PURPOSE: While patients with musculoskeletal disorders reported postural balance impairments, it is unknown whether patients with piriformis muscle syndrome (PMS) may exhibit postural balance disorders compared to controls. The aim was to compare postural balance in patients with PMS to controls in static and dynamic conditions. MATERIAL AND METHODS: Twelve patients with PMS and twelve controls were enrolled. Static postural balance was assessed by calculating the symmetry index (SI) in the unipedal posture. To measure vision contribution, the Romberg index (RI) was computed. Dynamic postural balance was evaluated with the Timed up and go test (TUGT). Besides, inter-limb strength asymmetry (SA), pain and the short form-36 (SF-36) were assessed. RESULTS: The PMS group (PMSG) exhibited significant (p < 0.001) higher SI in eyes opened (EO) and eyes closed (EC) conditions compared to the control group (CG). Besides, PMSG had significant higher RI (p < 0.05), TUGT scores (p < 0.001), SA values (p < 0.05), pain intensity (p < 0.001), and worse SF-36 scores on all physical health (p < 0.05) and psychological health (only in vitality and mental health [p < 0.05]), compared to CG. CONCLUSION: Our data revealed impaired static and dynamic postural balance, and reduced quality of life in PMSG compared to CG. Postural balance impairments could explain the poor quality of life, which are likely due to the higher SA and higher pain intensity. Clinicians and physiotherapists should consider postural balance disorders while designing rehabilitation programs in these patients.
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Síndrome do Músculo Piriforme , Equilíbrio Postural , Estudos de Casos e Controles , Humanos , Qualidade de Vida , Estudos de Tempo e MovimentoRESUMO
ß-1,3-1,4-glucanases (or lichenases; EC 3.2.1.73) comprise one of the main enzymes used in industry during recent decades. These enzymes hydrolyze ß-glucans containing ß-1,3 and ß-1,4 linkages, such as cereal ß-glucans and lichenan. The ß-1,3-1,4-glucanases are produced by a variety of bacteria, fungi, plants and animals. A large number of microbial ß-1,3-1,4-glucanases have potential application in industrial processes, such as feed, food and detergent industries. The present review summarizes the available studies with respect to ß-1,3-1,4-glucanases production conditions, enzyme biochemical properties and potential industrial application. © 2018 Society of Chemical Industry.
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Fungos/enzimologia , Glicosídeo Hidrolases/metabolismo , beta-Glucanas/metabolismo , Biotecnologia , Regulação Enzimológica da Expressão Gênica , Regulação Fúngica da Expressão GênicaRESUMO
Fermented milk is known to possess potent antioxidant activity. The present study was undertaken to assess the preventive effect of fermented camel milk (FCM) prepared using lactococcus lactis subsp. cremoris against CCl4 induced kidney damage in mice. Nephrotoxicity was induced in mice by a single dose of CCl4 (10 ml/kg 0·3% olive oil, ip). Female mice were pretreated daily with FCM for 15 d. Renal damage was associated with an increase in oxidative stress parameters (lipid peroxidation, protein carbonyl and changes in antioxidant enzyme activities and non-enzymatic antioxidant) and nephropathology markers.The renal injury induced by CCl4 was confirmed by the histological study of the CCl4-intoxicated mice. Pretreatment with FCM significantly prevented renal dysfunction by reducing oxidative stress, while mice recovered normal kidney histology. Moreover, FCM prevented toxicity biomarker changes by reducing creatinine, urea, uric acid, lactate dehydrogenase (LDH) and electrolytes levels in plasma. These data indicate that FCM is efficient in inhibiting oxidative stress induced by CCl4, and suggests that the administration of this milk may be helpful in the prevention of kidney damage.
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Camelus , Tetracloreto de Carbono/toxicidade , Fermentação , Nefropatias/induzido quimicamente , Nefropatias/prevenção & controle , Leite , Animais , Antioxidantes/análise , Biomarcadores/análise , Biomarcadores/sangue , Feminino , Rim/química , Rim/patologia , Nefropatias/patologia , Lactococcus lactis/metabolismo , Camundongos , Estresse Oxidativo , TunísiaRESUMO
BACKGROUND: Athletes with patellar tendinopathy (PT) have postural stability deficits; however, the underlying mechanisms and factors responsible remain unknown. The effect on postural stability in PT of decreased quadriceps strength, altered proprioception, lower-limb muscle tightness, and knee pain, which explain postural stability deficiency in other populations, is uninvestigated. HYPOTHESIS: Proprioceptive acuity, muscle tightness, quadriceps strength, and pain predict postural stability in athletes with PT. STUDY DESIGN: Cross-sectional comparative study. LEVEL OF EVIDENCE: Level 2. METHODS: A total of 43 athletes with PT and 43 healthy athletes were enrolled. Static and dynamic postural stability, proprioceptive acuity, muscle tightness, quadriceps strength, and pain were evaluated using a force platform, Y-balance test (YBT), a weight discrimination protocol, a goniometer, an isometric dynamometer, and a valid questionnaire, respectively. RESULTS: Athletes with PT had significantly worse static and dynamic postural stability in the affected limb (AL) compared with the nonaffected limb (NAL) (P < 0.01) and the control group (P < 0.01). Athletes suffering from PT revealed lower quadriceps strength (P < 0.01), proprioceptive acuity (P = 0.02), and higher muscle tightness in the AL compared with the NAL and controls. Quadriceps weakness of the AL and pain in athletes with PT explained the variance of dynamic postural stability impairment. CONCLUSION: Athletes with PT have postural stability deficiency compared with healthy peers. Our results demonstrate that quadriceps muscle weakness and pain are the factors that explain postural stability impairment. CLINICAL RELEVANCE: These results can assist clinicians in the design of therapeutic balance rehabilitation programs by acting not only on pain relief but also on quadriceps strengthening through resistance training to avoid subsequent injuries in athletes with PT.
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Objectives: The study sought to evaluate possible relationships between dynamic postural balance and pain, core stability, and hip range of motion in soccer players who were experiencing groin pain (GP). Furthermore, the study aimed to compare these measurements in symptomatic and asymptomatic players. Methods: The study included 42 male soccer players experiencing GP and an equal number of asymptomatic players. Dynamic postural balance, pain, hip range of motion and trunk endurance were measured. Results: The GP group revealed reduced dynamic balance performance (p < 0.01-0.001) in injured and non-injured limbs compared to control group. Further, players experiencing GP demonstrated lower hip range of motion in internal (p < 0.05) and total rotations (p < 0.01) in the injured limb, and lower trunk endurance (p < 0.001) compared to their asymptomatic peers. In general, core stability was associated (r = 0.13-0.61, p < 0.05-0.001) with the poor dynamic balance performance in the GP group while standing on injured and non-injured limbs. No significant correlations between dynamic postural balance, pain and hip range of motion were observed. Conclusion: Poor core endurance was found to be associated with dynamic balance disorders in soccer players experiencing GP. This information can aid in the development of targeted strategies to enhance dynamic postural balance in these players.
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BACKGROUND: Core stability training (CST) is effective in improving postural balance, core endurance, and self-reported outcomes in different populations. This study aimed to investigate the effect of CST in soccer players with groin pain (GP). HYPOTHESIS: CST would improve postural balance performance, core endurance, and self-reported outcomes in soccer players with GP. STUDY DESIGN: Randomized controlled trial. LEVEL OF EVIDENCE: Level 2. METHODS: Soccer players with GP who met the selection criteria were assigned randomly to a CST (CSTG, n = 10) or a control (CG, n = 10) group. The CG undertook no additional physical activity program besides their usual training. The CSTG performed a 12-week CST comprising 76 ~75 min sessions. Static (force platform) and dynamic (Y-Balance test) postural balance, core endurance (McGill trunk endurance tests), and self-reported outcomes (Copenhagen Hip and Groin Outcome Score [HAGOS]) were assessed before and immediately after the 12-week CST. RESULTS: Significant improvements were seen in dynamic postural balance (P = 0.04 to <0.01), HAGOS scores (P = 0.02 to <0.01), and core endurance measures (P < 0.01) in the CSTG in posttest compared with pretest session and compared with CG. Static bipedal postural balance measures showed significant improvements (eyes open, P = 0.02; eyes closed, P < 0.01) in the CSTG in posttest compared with pretest session. However, no significant differences (P > 0.05) were observed between CSTG and CG after the training period. CONCLUSION: A 12-week CST improved static (foam surface) and dynamic postural balance, core endurance measures, and HAGOS scores. CLINICAL RELEVANCE: The beneficial effect of CST on improving postural balance, core endurance, and self-reported outcomes in soccer players with GP suggests that this training would be an important feature of rehabilitation programs for these players. Coaches and clinicians should prioritize CST training when designing rehabilitation programs.
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The current study aimed to compare the effects of Pilates versus Zumba training on postural performance in middle-aged postmenopausal women. Fifty-seven eligible women, aged between 50 and 60 years, were randomized into three groups: Zumba (ZG) group, Pilates (PG) group or control (CG) group. Postural control was assessed using a force platform under 4 sensory manipulation conditions: on firm and foam surfaces with eyes opened (EO) and closed (EC). Our results showed more marked adaptations in favor of ZG concerning postural performance compared to PG. For the PG, postural control was significantly improved only in simple postural conditions on the firm surface with EO (p < 0.1) and EC (p < 0.05) conditions. However, postural control of the ZG significantly improved in both the simple and complex postural conditions, even under conflicting sensory situations (firm surface/EO (p < 0.001; 95 % CI: [1.34, 4.46]), EC (p < 0.001; 95 % CI: [2.13, 5.24])); foam surface/EO (p < 0.01; 95 % CI: [0.70, 8.57]), EC (p < 0.01; 95 % CI: [0.65, 8.52])). In conclusion, Zumba training seems to be more effective and a better strategy to promote postural control in daily living activities and autonomy in postmenopausal women than Pilates training. These findings are useful for public health practitioners in designing physical interventions for balance disorders.
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Pós-Menopausa , Equilíbrio Postural , Humanos , Feminino , Pessoa de Meia-Idade , Atividades Cotidianas , Exame FísicoRESUMO
Proprioception is essential to several conscious and unconscious sensations and automatic control of movement in daily life activities. Iron deficiency anemia (IDA) may alter proprioception as it could induce fatigue, and affect neural processes such as myelination, and neurotransmitters synthesis and degradation. This study aimed to explore the effect of IDA on proprioception in adult women. Thirty adult women with IDA and 30 controls participated in this study. The weight discrimination test was performed to assess proprioceptive acuity. Attentional capacity and fatigue were evaluated, too. Women with IDA had a significantly (P < 0.001) lower ability to discriminate weights compared to controls in the two difficult increments, and for the second easy weight (P < 0.01). For the heaviest weight, no significant difference was found. Attentional capacity and fatigue values were significantly (P < 0.001) higher in patients with IDA compared to controls. Moreover, moderate positive correlations between the representative proprioceptive acuity values and Hb (r = 0.68) and ferritin (r = 0.69) concentrations were found. Moderate negative correlations were found between the proprioceptive acuity values and general (r = - 0.52), physical (r = - 0.65) and mental (r = - 0.46) fatigue scores, and attentional capacity (r = - 0.52). Women with IDA had impaired proprioception compared to their healthy peers. This impairment may be related to neurological deficits due to the disruption of iron bioavailability in IDA. In addition, fatigue resulting from IDA due to the poor muscle oxygenation could also explain the proprioceptive acuity decrease in women suffering from IDA.
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Anemia Ferropriva , Humanos , Adulto , Feminino , Estudos de Casos e Controles , Estudos Transversais , Ferro , Fadiga/complicaçõesRESUMO
BACKGROUND: Preschool age is a critical stage of postural balance development. Posturography normative data during this age are crucial for surveillance of postural balance and for the timely diagnosis of any dysfunction. The aim of this study was to provide normative data, specific to Tunisian preschoolers, according to age and gender, and to examine gender- and age-related differences in postural balance. RESEARCH QUESTION: Are there postural balance gender- and age-related differences in Tunisian preschoolers? METHODS: The study included 410 (205 boys and 205 girls) preschool children aged between 4- and 5-year-old selected within a large geographic area of Tunisia. Postural balance was assessed using a stabilometric platform under 4 sensory conditions. The mean center of pressure velocity (CoP-V) parameter was selected for analysis. Differences between gender and age groups were analysed using the Mann-Whitney U. Normative data were expressed in percentiles. RESULTS: Significant gender effect was found in conditions where sensory inputs are most challenged with a significantly smaller mean CoP-V in girls compared to boys (p < 0.05). Moreover, 5-year-old children had significantly better postural balance than 4-year-old ones in almost all conditions (p < 0.05). SIGNIFICANCE: The normative data established for Tunisian preschoolers provide useful comparative data for pediatricians, teachers and coaches for the early evaluation and monitoring of postural balance during this age. Gender and age-related differences should be considered in this population.
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Equilíbrio Postural , Pré-Escolar , Feminino , Humanos , Masculino , Valores de Referência , Fatores SexuaisRESUMO
OBJECTIVE: To compare postural control performance between athletes with and without patellar tendinopathy (PT). DESIGN: Case-control study. PARTICIPANTS: Fifty-eight athletes, 29 with PT (PT group: PTG) and 29 healthy ones (control group: CG). MAIN OUTCOME MEASURES: Static and dynamic postural control were assessed with a force platform and the Y-Balance Test (Y-BT), respectively. Quadriceps strength of both limbs was evaluated using an isometric dynamometer. RESULTS: The PTG exhibited significantly (p < 0.05) higher centre of pressure (CoP) values than the CG on the foam surface, and significantly lower (p < 0.001) anterior, posteromedial and posterolateral normalized reach distances, and composite score in dynamic postural control on the injured limb (IL) compared to non-injured limb (NIL) and dominant limb (DL) of the CG. The quadriceps muscle strength was significantly lower on the IL compared to the NIL (p < 0.01) and DL (p < 0.05) of the CG. CONCLUSION: Athletes suffering from PT exhibited worse static and dynamic postural control compared to healthy peers. As players with PT frequently continue training despite their tendon pain, physiotherapists and clinicians should incorporate balance rehabilitation programs in the treatment of these players, not only to prevent further potential injuries but also to enhance sport performance.
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Tendinopatia , Atletas , Estudos de Casos e Controles , Estudos Transversais , Humanos , Equilíbrio PosturalRESUMO
BACKGROUND: Recent studies reported postural balance disorders in patients and soccer players with groin pain (GP) compared to controls. Since postural balance asymmetry identified after an initial injury contributes for subsequent injuries, identification of this asymmetry in soccer players with GP may highlight the risk of sustaining subsequent noncontact lower extremity musculoskeletal injuries in these players. Therefore, the aims of this study were to (i) examine static and dynamic unipedal postural balance asymmetry in soccer players with GP compared to healthy ones, and (ii) quantify the risk of subsequent noncontact lower extremity injuries in these players. RESEARCH QUESTION: Do soccer players with GP exhibit higher static and dynamic unipedal postural balance asymmetry, and higher risk of sustaining subsequent injuries compared to controls? METHODS: In this prospective case control study, 27 soccer players with non-time loss GP (GP group: GPG), and 27 healthy ones (control group: CG) were enrolled. Static and dynamic unipedal postural balance asymmetry were evaluated with a force platform using symmetry index (SI), and Y-balance test (Y-BT), respectively. Additionally, subsequent noncontact lower extremity musculoskeletal injuries were tracked for 10 months. RESULTS: The GPG revealed higher (p < 0.01) SI in eyes closed condition, higher (p < 0.001) side-to-side asymmetry in anterior, posteromedial and posterolateral reach distances and in composite Y-BT score compared to CG. They showed lower (p < 0.001) composite score for injured limb and higher (p < 0.001) side-to-side asymmetry in posteromedial reach distance compared to the cut-off values of 89.6 % and 4 cm, respectively. Moreover, GPG exhibited higher odds (OR= 7.48; 95 % CI = 2.15, 26.00; p < 0.01) of sustaining subsequent injuries compared to CG. SIGNIFICANCE: The Y-BT should be instituted into existing pre-participation physical examinations to screen for soccer players with non-time loss GP at an elevated risk of sustaining subsequent injuries. This could help coaches and clinicians make valid return to play decisions.
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Relesões , Futebol , Humanos , Futebol/lesões , Virilha , Estudos de Casos e Controles , Equilíbrio Postural , Dor Pélvica , Extremidade InferiorRESUMO
This study aimed to investigate static and dynamic postural balance inter-limb asymmetries in athletes with unilateral patellar tendinopathy (UPT) and estimate subsequent lower extremity musculoskeletal injury risk compared to controls. Twenty-eight athletes with UPT were recruited. Twenty-eight healthy athletes served as controls. Static postural balance inter-limb asymmetry (symmetry index: SI) was assessed based on differences in the mean centre of pressure (CoP) velocity (CoPv) values between the affected leg (AL) and non-affected leg (NAL) for the UPT group, and the dominant leg (DL) and non-dominant leg (NDL) for controls. Outcome variables were dynamic postural balance, assessed with inter-limb asymmetry using the Y Balance Test (YBT), and injury risk. In static balance, SI values were significantly (P<0.001) higher in the UPT group compared to controls. In dynamic balance, normalized inter-limb asymmetry values were also significantly higher in athletes with UPT compared to controls in anterior (P<0.001), posteromedial (P<0.001) and posterolateral (P<0.01) directions, and in the composite score (P<0.001). Furthermore, the incidence of sustaining a non-contact lower extremity injury during the follow-up period (10 months) was significantly higher (P<0.05) in the UPT group compared to controls. Athletes with UPT had postural balance inter-limb asymmetries. Moreover, they had increased subsequent lower extremity musculoskeletal injury risk compared to controls. Since most athletes with UPT continue to train and compete, adequate training and rehabilitation programmes should be implemented to prevent potential subsequent injury occurrence.
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Traumatismos em Atletas , Tendinopatia , Humanos , Traumatismos em Atletas/epidemiologia , Traumatismos em Atletas/prevenção & controle , Teste de Esforço , Atletas , Equilíbrio Postural , Tendinopatia/epidemiologia , Extremidade InferiorRESUMO
The effect of almond gum (AG), as natural polysaccharide with high nutritional value and important functional properties, on physicochemical and textural characteristics of Sardaigne-type cheese was investigated. Response surface methodology (RSM) using Box-Behnken design was applied to determine optimal levels of three selected processing variables such as coagulation temperature (25-45°C), stirring period (20-30 min), and AG concentration (0.25%-0.75%). A 3-level factorial design was employed to evaluate physicochemical and rheological responses of Sardaigne-type cheese with AG added. The P-values of ANOVA indicated that the processing variables selected have significantly affected dry matter content (p = .002), cheese yield (p = .0172), syneresis level (p = .0135), hardness (p = .0103), and adhesiveness (p = .0410). However, pH, cohesiveness, and elasticity are not affected by the selected processing variables. Predictive regression equations with a high coefficient of (R 2 ≥ .686) determination are constructed. The addition of AG owing to its water retention property has improved yield cheese as well moisture level. Therefore, this additional moisture in Sardaigne-type cheese will be responsible for softer and smoother textural. Indeed, fivefold drop of adhesiveness and fourfold reduction of hardness are observed in cheese formulated with AG at 0.75% and in same temperature and stirring period conditions that commercial cheese. RSM analysis showed that optimum levels of processing variables are reached at AG concentration of 0.57% (w/v), coagulation temperature of 42.57°C, and stirring period of 20 min. Results of sensory properties showed that AG incorporation in Sardaigne-type cheese does not have an adverse impact on organoleptically characteristics and overall acceptability of product was better than commercial cheese.
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OBJECTIVE: To compare postural balance outcomes between soccer players with and without groin pain (GP). DESIGN: Case-control study. SETTING: Laboratory. PARTICIPANTS: Fifty-four soccer players, 27 with GP (GP group: GPG) and 27 healthy ones (control group: CG). MAIN OUTCOME MEASURES: Static and dynamic postural balance were assessed with a force platform and Y-balance test (Y-BT), respectively. Hip abduction, internal rotation (IR), external rotation (ER) and total rotation (TR) of both limbs were evaluated. RESULTS: The GPG exhibited significant higher centre of pressure values in the bipedal posture only on the foam surface in eyes opened and closed compared to controls. Besides, they had lower anterior, posteromedial and posterolateral reach distances and composite Y-BT score on the injured limb (IL) compared to non-injured limb (NIL) and dominant-limb (DL) of the CG. Moreover, they showed lower abduction, IR, ER, and TR on the IL compared to NIL and DL. CONCLUSIONS: Dynamic unipedal postural balance disorder could be one of the limiting factors of performance in soccer players with non-time loss GP. Hence, postural balance data in these players could enable sport coaches and physical therapists to better understand the mechanisms contributing for performance decrease.
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Futebol , Estudos de Casos e Controles , Virilha , Humanos , Dor Pélvica , Equilíbrio PosturalRESUMO
BACKGROUND: Due to menstruation and restrictive dietary practices, women are at a particular risk of iron deficiency anemia (IDA). This hematologic manifestation could impair postural control as it induces fatigue, muscle weakness, cognitive and neurological functions alteration. AIM: This study aimed to investigate IDA effects on postural control in young women in comparison to healthy counterparts. MATERIAL AND METHODS: Twenty-four young women with IDA and twenty-four controls participated in this study. Center of pressure (CoP) excursions, in the bipedal and semi-tandem postures on the firm and foam surfaces in the eyes opened (EO) and closed (EC), were recorded, and Romberg index was calculated to evaluate postural control. Besides physical performance, attentional capacity, fatigue, and heart and respiratory rates were assessed. RESULTS: Young women with IDA had significantly higher CoP velocity (CoPv) values in the bipedal posture in both vision and surface conditions (EO [firm: P < 0.001 and foam: P < 0.01]; EC: P < 0.001), as well as in the semi-tandem posture (EO [firm: P < 0.01 and foam: P < 0.001]; EC: P < 0.001) compared to controls indicating that they had worse postural control than their peers. In addition, values of the respiratory rate (P < 0.001), attentional capacity (P < 0.001), physical performance (P < 0.001), fatigue (P < 0.001), and Romberg index on the foam surface in both postures (P < 0.05) were significantly higher in young women with IDA compared to controls. CONCLUSIONS: Physical performance, fatigue, tachypnea and attentional capacity resulting from IDA may explain postural control disorder in young women.
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Anemia , Deficiências de Ferro , Equilíbrio Postural , Fadiga , Feminino , Humanos , PosturaRESUMO
Based on Plackett-Burman design, steepest ascent method, and Box-Behnken design, statistical optimization for B. subtilis AF17 for levan production was carried out. Sucrose, tryptone and initial pH were found to be the most significant parameter (P < 0.05) for levan production. Result showed that the optimum condition was sucrose 162.5 g/L, tryptone 10 g/L, initial pH 7 and maximum yield was 7.9 ± 0.18 g/L in 72 h fermentation. Purified levan was characterized using various physicochemical techniques such as GC-MS, 1H NMR, 13C NMR spectroscopy and SEC/TDA. Based on this data, the structure of levan was independent of initial culture conditions. The biomedical potential of the isolated Bacillus subtilis A17 levan for its angiotensin-I converting enzyme (ACE) inhibition activities was exploited in vitro. Interestingly, levan possessed an important angiotensin I converting enzyme (ACE) inhibitory 81.1 ± 4.1% at 4 mg/mL. The overall, data suggested that levan presents a promising natural source of antihypertensive agents.
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A strain of Bacillus subtilis AF 17 with high exopolysaccharide (EPS) production ability was isolated and identified based on morphological and physiological characteristics and phylogenetic analysis of 16S rDNA sequences. EPS was isolated from the strain fermentation broth by alcohol precipitation and gel-filtration chromatography. Its structural characteristics were investigated and elucidated by methylation analysis, gas chromatography mass spectrometry and nuclear magnetic resonance spectroscopy. Based on the obtained data, the EPS was found to be a levan containing a backbone of 6-substituted ß-fructoses, with a low grade of branching at position 1 (linear/branched ratio 20:1). Levan showed a molecular weight of about 20 MDa. The antioxidant activity of this biopolymer was studied and revealed that levan showed an interesting 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging capacity (IC50 levan = 1.42 mg/mL), reducing power, and also a strong total antioxidant activity. Overall, the results suggest that levan is a promising source of natural antioxidants and can be used as additive in food and pharmaceutical preparations.
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Antioxidantes/química , Bacillus subtilis/química , Frutanos/química , Antioxidantes/metabolismo , Bacillus subtilis/genética , Bacillus subtilis/isolamento & purificação , Cromatografia em Gel , Fermentação , Frutanos/isolamento & purificação , Espectroscopia de Ressonância Magnética , Peso Molecular , FilogeniaRESUMO
Carbon tetrachloride (CCl4) is a xenobiotic present in the environment, can cause harmful effects on human health. In the present study, we attempted to elucidate the cardiopreventive potential of the fermented camel milk by lactococcus lactis subsp cremoris (FCM-LLC) against the toxic effects of acute exposure to CCl4 on heart tissue of mice. Twenty-eight mice's were divided into four groups of seven each: group (C) served as control; group (FCM-LLC) received only 100mgL of FCM-LLC/kg body weight daily for 15days; group (CCl4) was administered by a single dose of CCl4 (10mL/kg in 0.3% olive oil, i.p) at day 14 and group (FCM-LLC+CCl4) pretreated with FCM-LLC and received a single dose of CCl4 on day 14. The exposure to a single dose of CCl4 caused cardiotoxicity expressed by an increase in lipid peroxidation (TBARS), protein carbonyls (PC) levels and in antioxidant markers (superoxide dismutase (SOD), catalase (CAT), gluthathione peroxidase (GPx), glutathione (GSH) and Vitamin C levels) in the CCl4-treated group when compared with the untreated group. Furthermore, treatment with CCl4 significantly elevated the cardiac toxicity markers while increasing of alanine aminotransferase (ALT), lactate dehydrogenase (LDH), creatine kinase (CK), creatine kinase MB (CKMB) and Troponin I activities. The pre-treatment of experimental mice's with FCM-LLC has allowed an improvement through lowering oxidative stress and attenuating cardiac toxicity. These modifications were further evident through histopathological aspects of the heart. Overall, the present data provide evidence of the beneficial effects of fermented camel milk by lactococcus lactis subsp creemoris clearly revealed through the reduction of the CCl4 induced heart oxidative damages.