Polyphenolic content, Antioxidant and Anti-inflammatory activities of Melon (Cucumis melo L. var. inodorus) Seeds

The aim of this study was to estimate the content of polyphenols, flavonoids and tannins compounds and to evaluate the antioxidant activity and  the  in vitro anti-inflammatory  of    the ethanolic extract of  melon (Cucumis melo L.  var inodorus) seeds. The Folin-Ciocalteau and AlCl3 methods were applied in order to quantify the polyphenolic and flavonoids contents, respectively. However, DPPH and  β-carotene bleaching  method were applied  to evaluate the  in vitro antioxidant activity. The polyphenolic  and flavonoids contents  of    seeds  extract  were  found to be 37,10 ± 1,11 mg GAE/g of dry extract and 0,43 ± 0,27 mg QE/ g  of dry extract, respectively. Whereas the amount of tannins was  48, 30 ±  0,90 mg TAE/ g of dry extract. The scavenger effect of  seeds extract against DPPH radicals showed IC50 value of  4,13 ± 0,07 mg/ ml. The β-carotene bleaching assay indicated a strong inhibition percentage of the lipid peroxidation with value of 69,47 %. The in vitro anti-inflammatory activity was evaluated using the inhibition of   proteins denaturation revealed that the seeds extract had a moderate anti-inflammatory activity which is estimated at 49,09 % compared to the aspirin (97,73  %) at 1 mg/ ml.  Finally, melon seeds may be considered as a promising source of natural antioxidants which possess remarkable therapeutic action as inflammatory activity and may serve as food ingredients. Keywords: Cucumis melo var. inodorus, Polyphenols, Flavonoids, Tannins, Oxidative stress,  Anti-inflammatory activity

Decompression of Facial Nerve after Temporal Bone Fracture: about 20 Cases

Background: Seven to ten percent of facial nerve paralysis occurs in patients with temporal bone fracture. It has become increasingly common due to the development of human activity. One of the main topics of discussion is facial nerve injury management resulting from temporal bone trauma. The purpose of this study is to report the paralysis of facial nerve after temporal bone fractures. Aim: In this study, our goal was to record the facial profile of rhinoplasty applicants in Shiraz. Methods: This retrospective study analyzed 20 cases of traumatic paralysis of facial nerve, which underwent facial nerve decompression. Results: Recovery rate was correlated to the delay of surgery. 83.3% of patients who underwent decompression surgery within the first 2 weeks after trauma had an excellent therapeutic outcome (HB grading I-II) and the difference was statistically significant (p=0.000). Conclusion: Facial nerve paralysis surgical management after bone fracture is controversial. The decision must be taken according to the type of paralysis and the radiological electrophysiological and evolutionary data

Cutting parameters and vibrations analysis of magnetic bearing spindle in milling process

International audienceIn modern production, milling is considered the widespread cutting process in the formatting field. It remains important to study this manufacturing process as it can be subject to some parasitic phenomena that can degrade surface roughness of the machined part, increase tool wear and reduce spindle life span. In fact, the best quality work piece is obtained with a suitable choice of parameters and cutting conditions. In another hand, the study of tool vibrations and the cutting force attitude is related to the study of bearings as they present an essential part in the spindle system. In this work, a modeling of a High Speed Milling (HSM) spindle supported by two pair of Active Magnetic Bearings (AMB) is presented. The spindle is modeled by Timoshenko beam finite elements where six degrees of freedom are taken into account. The rigid displacements are also introduced in the modeling. Gyroscopic and centrifugal terms are included in the general equation. The bearings reaction forces are modeled as linear functions of journal displacement and velocity in the bearing clearance. A cutting force model for peripheral milling is proposed to estimate the tool-tip dynamic responses as well as dynamic cutting forces which are also numerically investigated. The time history of response, orbit, FFT diagram at the tool-tip center and the bearings dynamic coefficients are plotted to analyze dynamic behavior of the spindle

Gastroprotective and antioxidant properties of ethanolic extract from pear fruit (Pyrus communis L.)

The objective of this study was to evaluate the phenolic content, in vitro antioxidant activity and the gastroprotective effect of the ethanolic extract of pear fruits (Pyrus communis L.). The amount of polyphenols and flavonoids contents of ethanolic extract were found to be 77,50 ± 2,50 mg GAE/g of dry extract and 0,31 ± 0,003 mg QE/ g of dry extract, respectively. Whereas the amount of tannins was 61,43 ± 0,009 mg TAE/ g of dry extract. Hydroxyl radical scavenging and reducing power tests were used to evaluate the antioxidant activities of this extract. The scavenging effect of ethanolic extract against hydroxyl radicals showed IC50 value of 2.71 ± 0.02 mg/ ml. Reducing power test indicated the ability of ethanolic extract of pear fruits to reduce Fe+2 to Fe+3  with EC50value of 1.043±0.01 mg/ml. The treatment of rats with the ethanolic extract at  dose of 200 mg/kg reduced the ulcerogenic effect of ethanol with value of protection rate of 94.44%, but the protection rate decreased in 600 mg/kg treated group  to 90.17%.  In conclusion, natural antioxidants derived from pear fruits can prevent gastric ulcer through their antioxidant activity  Keywords: Pyrus communis L., Polyphenols, Antioxidant activity, Ulcer, Rat

Phenolic content and antioxidant activity of ethanolic extracts from Citrus sinensis L. and Citrus reticulata L. fruits

Citrus fruits, in particular the genus Citrus, are very rich in antioxidants which have beneficial effects on human health. The objective of this study was to evaluate the phenolic content and the antioxidant activity of the ethanolic extracts from orange (Citrus sinensis L.) and mandarin (Citrus reticulata L.) fruits. The quantitative estimation of the total phenolic content in the two extracts revealed their richness in these compounds. The results obtained showed that the polyphenols content were 159.66 ± 2.62 mg GAE / g of dry extract and 127.33 ± 2.32 mg GAE / g of dry extract for C. sinensis and C. reticulata, respectively.The quantification of flavonoids content showed that the ethanolic extracts of C. sinensis and C. reticulata contained 0.85 ± 0.01 mg QE / g of dry extract and 0.876 ± 0.073 mg QE / g of dry extract, respectively. Whereas, the tannins contents were 46.32 ± 1.02 mg TAE / g of dry extract for  C. sinensis and 47.65 ± 1.36 mg TAE / g of dry extract for C. reticulata. In vitro antioxidant activity was evaluated using two tests: the reducing power and the hydroxyl radical scavenger test. The evaluation of the two extracts by the ferric iron reducing power test showed an EC50 value of 0.882 ± 0.037 mg / ml for  C. sinensis extract and an EC50 of 1.085 ± 0.068 mg / ml for C. reticulata extract. In addition, C. sinensis and C. reticulata showed good hydroxyl radical scavenging effect with IC50 values of 0.303 ± 0.026 mg /ml and 0.572 ± 0.100 mg / ml for C. sinensis and C. reticulata, respectively. These results suggested that these fruit extracts could be good sources of phenolic compounds and ingredients with high antioxidant potential. Keywords: Citrus sinensis, Citrus reticulata, Polyphenols, Flavonoids, Tannins, Antioxidant activity

In vitro anti-oxidant, hypotensive and diuretic activities of Origanum glandulosum in rat

The objective of this study was to evaluate the in vitro anti-oxidant, hypo-tensive and the diuretic activities of Origanum glandulosum leaves in rat. Chemical analysis revealed the isolation of katuranin and 5-isopropyl-3-methylphenol. Ethyl acetate extract possessed highest scavenging activity against DPPH and hydroxyl radicals. Intravenous administration of extracts (0.04 to 12 mg/kg body weight) dose-dependently decreased the blood pressure (systolic, diastolic and mean) of the anesthetized rat. Methanol extract showed dose-dependent diuretic activity by increasing the urine output (77%) and the urinary excretion of sodium and potassium. In conclusion, this study supports the use of O. glansulosum in traditional medicine as hypotensive and diuretic agents

In vitro antioxidant activity and gastroprotective effect of ethanolic extract from Cucumis melo L. var. inodorus fruit on ethanol-induced gastric ulcer in rats

The aim of this study was to estimate the content of polyphenols, flavonoids and tannins and to evaluate the antioxidant property and the antiulcer activity of the ethanolic extract of melon (Cucumis melo L. var. inodorus) pulp on ethanol-induced gastric ulcers in rats.  Ferric reducing power and hydroxyl radical scavenging tests were applied to evaluate the in vitro antioxidant activity. The polyphenolic and flavonoids contents of    melon extract were found to be 56.5 ± 2.49 mg GAE/g of dry extract and 0.43 ± 0.09 mg QE/ g of dry extract, respectively. Whereas the tannins content was 48. 30 ±  0. 9 mg ETA/ g of dry extract.  Melon pulp  extract exhibited  a good reducing potential   with  an  EC50 of  4.23 ± 0.08 mg/ml and high hydroxyl radical scavenging activity with IC50 of  1.83± 0.09 mg/ml. Oral administration of the melon pulp extract at doses of  200 and 600 mg/kg to rats  reduced gastric mucosal lesions  dose-dependently  with percentage protection of 56.56 and 93.79% compared to omeprazole (95.92 %) as reference drug. These results showed that the melon pulp extract had a good antioxidant activity and gastroprotective potential suggesting it use as an adjuvant in the treatment of gastric ulcer. Keywords: Cucumis melo var. inodorus, Polyphenols, Flavonoids, Tannins, Ulcer, Rat

Phytochemical analysis, hypotensive effect and antioxidant properties of Myrtus communis L. growing in Algeria

Objective: To analyze Myrtus communis chemically and evaluate the hypotensive effects and antioxidant properties of methanol, chloroform, ethyl acetate and aqueous extracts from the leaves of this plant. Methods: Total phenolic and flavonoid contents as well as the antioxidant potential of methanol, chloroform, ethyl acetate and aqueous extracts have been investigated by using different in vitro methods. The hypotensive effects of methanol and ethyl acetate extracts were evaluated in anaesthetized rats by using the method of invasive blood pressure recording. Moreover, ethyl acetate extract was subjected to analysis by different chromatographic methods in order to identify new compounds. Results: Chemical analysis of ethyl acetate extract revealed the presence of myrecitin-3-O-α-rhamnoside. Ethyl acetate extract was found to have the highest total phenolic and total flavonoid contents with the values of 435.37 mg gallic acid equivalents/g dried weight and 130.75 mg quercetin equivalent/g dried weight, respectively. Ethyl acetate extract also exhibited the highest activity in scavenging 2,2-diphenyl-1-picrylhydrazyl, 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulfonic acid), hydroxyl radical and reducing power; whereas, methanol extract exhibited higher chelating activity than ethyl acetate extract did. Chloroform was found to be strong inhibitor of lipid peroxidation in β-carotene bleaching assay (91.19%), ferric thiocyanate method (87.55%), and thiobarbituric acid method (82.59%) as compared to butylated hydroxytoluene. Intravenous administration of methanol and ethyl acetate extract (0.04 to 12 mg/kg body weight) decreased the maximum mean arterial blood pressure with values of 20.6% and 32.49% at 12 mg/kg body weight, respectively in anesthetized rats. Conclusions: This study provides a scientific basis for the use of Myrtus communis in traditional medicine as hypertensive agent as well as additional resources for natural antioxidants