The Experts below are selected from a list of 2226 Experts worldwide ranked by ideXlab platform
Maria Zamaraeva - One of the best experts on this subject based on the ideXlab platform.
-
Role of Structural Changes Induced in Biological Membranes by Hydrolysable Tannins from Sumac Leaves (Rhus typhina L.) in their Antihemolytic and Antibacterial Effects
The Journal of Membrane Biology, 2014Co-Authors: Ewa Olchowik-grabarek, Izabela Swiecicka, Zhanna Andreeva-kovaleskaya, Alexander Solonin, Dorota Bonarska-kujawa, Halina Kleszczyńska, Saidmukhtar Mavlyanov, Maria ZamaraevaAbstract:In this study, we found that the Sumac tannins ( Rhus typhina L.) exert to a various extent antihemolytic effects and antibacterial activity against Bacillus cereus and Pseudomonas aeruginosa depending on structural specificity of bacteria and different mechanisms of their toxic action. The Sumac tannins exert the most expressed activity against B. cereus. The antihemolytic effect of the Sumac tannins seems to be connected to a greater extent with their modifying action on the erythrocyte membrane structure. It was found that the Sumac tannins are incorporated into the erythrocyte membrane, causing transformation of discocytes into echinocytes and enhancing the rigidity of the hydrophilic region of the lipid bilayer. We suggest that the embedding of Sumac tannins into the membrane of erythrocytes alters their physical properties and, as a consequence, can limit their interaction with bacterial toxins.
-
Stabilization of erythrocytes against oxidative and hypotonic stress by tannins isolated from Sumac leaves (Rhus typhina L.) and grape seeds (Vitis vinifera L.)
Cellular & Molecular Biology Letters, 2012Co-Authors: Ewa Olchowik, Saidmukhtar Mavlyanov, Karol Lotkowski, Nodira Abdullajanova, Maksim Ionov, Maria Bryszewska, Maria ZamaraevaAbstract:Erythrocytes are constantly exposed to ROS due to their function in the organism. High tension of oxygen, presence of hemoglobin iron and high concentration of polyunsaturated fatty acids in membrane make erythrocytes especially susceptible to oxidative stress. A comparison of the antioxidant activities of polyphenol-rich plant extracts containing hydrolysable tannins from Sumac leaves ( Rhus typhina L.) and condensed tannins from grape seeds ( Vitis vinifera L.) showed that at the 5–50 μg/ml concentration range they reduced to the same extent hemolysis and glutathione, lipid and hemoglobin oxidation induced by erythrocyte treatment with 400 μM ONOO^− or 1 mM HClO. However, extract (condensed tannins) from grape seeds in comparison with extract (hydrolysable tannins) from Sumac leaves stabilized erythrocytes in hypotonic NaCl solutions weakly. Our data indicate that both hydrolysable and condensed tannins significantly decrease the fluidity of the surface of erythrocyte membranes but the effect of hydrolysable ones was more profound. In conclusion, our results indicate that extracts from Sumac leaves (hydrolysable tannins) and grape seeds (condensed tannins) are very effective protectors against oxidative damage in erythrocytes.
Wei Chen - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of antimicrobial and antioxidant activit ies of Syrian Sumac fruit extract
2013Co-Authors: Rima Kossah, Consolate Nsabimana, Hao Zhang, Wei ChenAbstract:The fruits of Sumac ( Rhus coriaria ) are consumed as a popular spice to flavor some meals and to treat diarrhea. This study focused on investigating the antimicrobial and antioxidant activities of R. coriaria growing in Syria. The antimicrobial activity of Syrian Sumac fruit extract was tested against vario us Gram-positive and Gramnegative bacteria as well as yeasts. The extract ex erted a strong and concentrationdependent inhibitory effect with a very broad spect rum. However, the extract showed better activity against the tested bacteria compare d to the yeasts. Minimum inhibitory concentration (MIC) of the extract against Gram-pos itive bacteria ranged from 500 to 1500µg/ml, whereas the MIC with Gram-negative bacteria was higher (10003500µg/ml). Nevertheless, the MIC observed for yeasts varied between 5200 and 7000µg/ml. Bacillus cereus and Helicobacter pylori were found to be the most sensitive Gram-positive and Gram-negative bacteria with their MIC being 500 and 1000µg/ml, respectively. The antioxidant activity o f Syrian Sumac fruit extract was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging capacity and reducing power. Results showed that the IC 50 value obtained with DPPH (0.038mg/ml) was lower than that observed for reducing power (0. 074mg/ml). To the best of our knowledge, this is the first report on the biologic al activities of the extract obtained from Syrian Sumac fruit. Our findings indicated tha t Syrian Sumac fruit extract might be used as a natural agent to prevent the growth of food spoilage bacteria, particularly, H. pylori leading to the reduction of gastroenteritis risk.
-
comparative study on the chemical composition of syrian Sumac rhus coriaria l and chinese Sumac rhus typhina l fruits
Pakistan Journal of Nutrition, 2009Co-Authors: Rima Kossah, Consolate Nsabimana, Jianxin Zhao, Haiqin Chen, Fengwei Tian, Hao Zhang, Wei ChenAbstract:In this article, two different Sumac species, namely Syrian Sumac (Rhus coriaria L.) and Chinese Sumac (Rhus typhina L.) were investigated in order to determine and compare the chemical compositions of their fruits. The proximate analysis revealed a significant difference (p<0.05) between the two Sumac species, with Chinese Sumac exhibiting higher contents in ash, protein, fat and fiber. Gas Chromatography (GC) revealed that Chinese Sumac contains higher percentage of total unsaturated fatty acids than that of Syrian Sumac, with oleic and linoleic acids being predominant. The amounts of potassium and calcium were found to be higher in the fruit of Syrian Sumac than in that of Chinese Sumac. However, both Sumac fruits exhibited also appreciable quantities of magnesium, phosphorous, sodium and iron. Syrian Sumac contained much more vitamins than that of Chinese Sumac, which in contrast exhibited higher amounts of essential and non-essential amino acids than that of Syrian Sumac. High-Performance Liquid Chromatography (HPLC) indicated that Syrian Sumac contains higher concentrations of organic acids than Chinese Sumac and malic acid is the most abundant. Results from this study suggested that both Syrian and Chinese Sumac fruits are potential sources of food ingredients and/or additives.
-
Comparative study on the chemical composition of Syrian Sumac (Rhus coriaria L.) and Chinese Sumac (Rhus typhina L.) fruits.
Pakistan Journal of Nutrition, 2009Co-Authors: Rima Kossah, Consolate Nsabimana, Jianxin Zhao, Haiqin Chen, Fengwei Tian, Hao Zhang, Wei ChenAbstract:In this article, two different Sumac species, namely Syrian Sumac (Rhus coriaria L.) and Chinese Sumac (Rhus typhina L.) were investigated in order to determine and compare the chemical compositions of their fruits. The proximate analysis revealed a significant difference (p
Saidmukhtar Mavlyanov - One of the best experts on this subject based on the ideXlab platform.
-
Role of Structural Changes Induced in Biological Membranes by Hydrolysable Tannins from Sumac Leaves (Rhus typhina L.) in their Antihemolytic and Antibacterial Effects
The Journal of Membrane Biology, 2014Co-Authors: Ewa Olchowik-grabarek, Izabela Swiecicka, Zhanna Andreeva-kovaleskaya, Alexander Solonin, Dorota Bonarska-kujawa, Halina Kleszczyńska, Saidmukhtar Mavlyanov, Maria ZamaraevaAbstract:In this study, we found that the Sumac tannins ( Rhus typhina L.) exert to a various extent antihemolytic effects and antibacterial activity against Bacillus cereus and Pseudomonas aeruginosa depending on structural specificity of bacteria and different mechanisms of their toxic action. The Sumac tannins exert the most expressed activity against B. cereus. The antihemolytic effect of the Sumac tannins seems to be connected to a greater extent with their modifying action on the erythrocyte membrane structure. It was found that the Sumac tannins are incorporated into the erythrocyte membrane, causing transformation of discocytes into echinocytes and enhancing the rigidity of the hydrophilic region of the lipid bilayer. We suggest that the embedding of Sumac tannins into the membrane of erythrocytes alters their physical properties and, as a consequence, can limit their interaction with bacterial toxins.
-
Stabilization of erythrocytes against oxidative and hypotonic stress by tannins isolated from Sumac leaves (Rhus typhina L.) and grape seeds (Vitis vinifera L.)
Cellular & Molecular Biology Letters, 2012Co-Authors: Ewa Olchowik, Saidmukhtar Mavlyanov, Karol Lotkowski, Nodira Abdullajanova, Maksim Ionov, Maria Bryszewska, Maria ZamaraevaAbstract:Erythrocytes are constantly exposed to ROS due to their function in the organism. High tension of oxygen, presence of hemoglobin iron and high concentration of polyunsaturated fatty acids in membrane make erythrocytes especially susceptible to oxidative stress. A comparison of the antioxidant activities of polyphenol-rich plant extracts containing hydrolysable tannins from Sumac leaves ( Rhus typhina L.) and condensed tannins from grape seeds ( Vitis vinifera L.) showed that at the 5–50 μg/ml concentration range they reduced to the same extent hemolysis and glutathione, lipid and hemoglobin oxidation induced by erythrocyte treatment with 400 μM ONOO^− or 1 mM HClO. However, extract (condensed tannins) from grape seeds in comparison with extract (hydrolysable tannins) from Sumac leaves stabilized erythrocytes in hypotonic NaCl solutions weakly. Our data indicate that both hydrolysable and condensed tannins significantly decrease the fluidity of the surface of erythrocyte membranes but the effect of hydrolysable ones was more profound. In conclusion, our results indicate that extracts from Sumac leaves (hydrolysable tannins) and grape seeds (condensed tannins) are very effective protectors against oxidative damage in erythrocytes.
Rima Kossah - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of antimicrobial and antioxidant activit ies of Syrian Sumac fruit extract
2013Co-Authors: Rima Kossah, Consolate Nsabimana, Hao Zhang, Wei ChenAbstract:The fruits of Sumac ( Rhus coriaria ) are consumed as a popular spice to flavor some meals and to treat diarrhea. This study focused on investigating the antimicrobial and antioxidant activities of R. coriaria growing in Syria. The antimicrobial activity of Syrian Sumac fruit extract was tested against vario us Gram-positive and Gramnegative bacteria as well as yeasts. The extract ex erted a strong and concentrationdependent inhibitory effect with a very broad spect rum. However, the extract showed better activity against the tested bacteria compare d to the yeasts. Minimum inhibitory concentration (MIC) of the extract against Gram-pos itive bacteria ranged from 500 to 1500µg/ml, whereas the MIC with Gram-negative bacteria was higher (10003500µg/ml). Nevertheless, the MIC observed for yeasts varied between 5200 and 7000µg/ml. Bacillus cereus and Helicobacter pylori were found to be the most sensitive Gram-positive and Gram-negative bacteria with their MIC being 500 and 1000µg/ml, respectively. The antioxidant activity o f Syrian Sumac fruit extract was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging capacity and reducing power. Results showed that the IC 50 value obtained with DPPH (0.038mg/ml) was lower than that observed for reducing power (0. 074mg/ml). To the best of our knowledge, this is the first report on the biologic al activities of the extract obtained from Syrian Sumac fruit. Our findings indicated tha t Syrian Sumac fruit extract might be used as a natural agent to prevent the growth of food spoilage bacteria, particularly, H. pylori leading to the reduction of gastroenteritis risk.
-
comparative study on the chemical composition of syrian Sumac rhus coriaria l and chinese Sumac rhus typhina l fruits
Pakistan Journal of Nutrition, 2009Co-Authors: Rima Kossah, Consolate Nsabimana, Jianxin Zhao, Haiqin Chen, Fengwei Tian, Hao Zhang, Wei ChenAbstract:In this article, two different Sumac species, namely Syrian Sumac (Rhus coriaria L.) and Chinese Sumac (Rhus typhina L.) were investigated in order to determine and compare the chemical compositions of their fruits. The proximate analysis revealed a significant difference (p<0.05) between the two Sumac species, with Chinese Sumac exhibiting higher contents in ash, protein, fat and fiber. Gas Chromatography (GC) revealed that Chinese Sumac contains higher percentage of total unsaturated fatty acids than that of Syrian Sumac, with oleic and linoleic acids being predominant. The amounts of potassium and calcium were found to be higher in the fruit of Syrian Sumac than in that of Chinese Sumac. However, both Sumac fruits exhibited also appreciable quantities of magnesium, phosphorous, sodium and iron. Syrian Sumac contained much more vitamins than that of Chinese Sumac, which in contrast exhibited higher amounts of essential and non-essential amino acids than that of Syrian Sumac. High-Performance Liquid Chromatography (HPLC) indicated that Syrian Sumac contains higher concentrations of organic acids than Chinese Sumac and malic acid is the most abundant. Results from this study suggested that both Syrian and Chinese Sumac fruits are potential sources of food ingredients and/or additives.
-
Comparative study on the chemical composition of Syrian Sumac (Rhus coriaria L.) and Chinese Sumac (Rhus typhina L.) fruits.
Pakistan Journal of Nutrition, 2009Co-Authors: Rima Kossah, Consolate Nsabimana, Jianxin Zhao, Haiqin Chen, Fengwei Tian, Hao Zhang, Wei ChenAbstract:In this article, two different Sumac species, namely Syrian Sumac (Rhus coriaria L.) and Chinese Sumac (Rhus typhina L.) were investigated in order to determine and compare the chemical compositions of their fruits. The proximate analysis revealed a significant difference (p
Ewa Olchowik-grabarek - One of the best experts on this subject based on the ideXlab platform.
-
Role of Structural Changes Induced in Biological Membranes by Hydrolysable Tannins from Sumac Leaves (Rhus typhina L.) in their Antihemolytic and Antibacterial Effects
The Journal of Membrane Biology, 2014Co-Authors: Ewa Olchowik-grabarek, Izabela Swiecicka, Zhanna Andreeva-kovaleskaya, Alexander Solonin, Dorota Bonarska-kujawa, Halina Kleszczyńska, Saidmukhtar Mavlyanov, Maria ZamaraevaAbstract:In this study, we found that the Sumac tannins ( Rhus typhina L.) exert to a various extent antihemolytic effects and antibacterial activity against Bacillus cereus and Pseudomonas aeruginosa depending on structural specificity of bacteria and different mechanisms of their toxic action. The Sumac tannins exert the most expressed activity against B. cereus. The antihemolytic effect of the Sumac tannins seems to be connected to a greater extent with their modifying action on the erythrocyte membrane structure. It was found that the Sumac tannins are incorporated into the erythrocyte membrane, causing transformation of discocytes into echinocytes and enhancing the rigidity of the hydrophilic region of the lipid bilayer. We suggest that the embedding of Sumac tannins into the membrane of erythrocytes alters their physical properties and, as a consequence, can limit their interaction with bacterial toxins.
