Browsing by Author "Prabhu, S.G."

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Juglans regia seeds have effects on platelets and peripheral fat deposition in the aorta and heart of C57BL/6J mice fed with normal and high fat simple carbohydrate diet
(2016) Prabhu, S.G.; Karkala, S.; Roy, N.; D Souza, S.; Abraham, A.
Background: Consumption of nuts particularly walnuts has been widely recommended for lowering the risk of coronary heart disease; however, very few studies have evaluated the potential unfavourable effects that Walnut seeds might have in vivo. Objective: To investigate the long-term effects of Juglans regia seed supplementation in specially formulated feed when fed to developed mice model. Method: C57BL/6J male mice were divided into four groups, labelled, C (control), T (High Fat Simple Carbohydrate-HFSC), Cw (control + walnut) and Tw (HFSC+ walnut) based on diet. Four mice from each group were sacrificed at the end of the first and fifth month respectively. Blood samples were collected every month. Bleeding time, blood platelet number and morphology were studied. Histopathological analysis of heart and aorta were also performed. Results: Groups Cw and Tw showed a significant increase in platelet count; however, platelet activation was not detected. There was a trend to an increase in bleeding time in group Cw. Expanded lumen diameter of the aorta was observed in Cw and Tw mice initially, however, it was found to constrict by the end of the study. A large amount of peripheral fat deposition in the aortas of Cw and Tw was observed, which increased through the course of the experiment. Conclusion: Kashmiri walnut seed supplementation was found to reduce the signs in shape change of platelets as well as increase platelet number with a trend to an increased bleeding time. This observation could be of medical interest. Histopathological analysis of heart and aorta showed lipid sequestration which merits further investigations. 2016 Bentham Science Publishers.
Juglans regia seeds have effects on platelets and peripheral fat deposition in the aorta and heart of C57BL/6J mice fed with normal and high fat simple carbohydrate diet
(Bentham Science Publishers B.V. P.O. Box 294 Bussum 1400 AG, 2016) Prabhu, S.G.; Karkala, S.; Roy, N.; D'Souza, S.; Abraham, A.
Background: Consumption of nuts particularly walnuts has been widely recommended for lowering the risk of coronary heart disease; however, very few studies have evaluated the potential unfavourable effects that Walnut seeds might have in vivo. Objective: To investigate the long-term effects of Juglans regia seed supplementation in specially formulated feed when fed to developed mice model. Method: C57BL/6J male mice were divided into four groups, labelled, C (control), T (High Fat Simple Carbohydrate-HFSC), Cw (control + walnut) and Tw (HFSC+ walnut) based on diet. Four mice from each group were sacrificed at the end of the first and fifth month respectively. Blood samples were collected every month. Bleeding time, blood platelet number and morphology were studied. Histopathological analysis of heart and aorta were also performed. Results: Groups Cw and Tw showed a significant increase in platelet count; however, platelet activation was not detected. There was a trend to an increase in bleeding time in group Cw. Expanded lumen diameter of the aorta was observed in Cw and Tw mice initially, however, it was found to constrict by the end of the study. A large amount of peripheral fat deposition in the aortas of Cw and Tw was observed, which increased through the course of the experiment. Conclusion: Kashmiri walnut seed supplementation was found to reduce the signs in shape change of platelets as well as increase platelet number with a trend to an increased bleeding time. This observation could be of medical interest. Histopathological analysis of heart and aorta showed lipid sequestration which merits further investigations. © 2016 Bentham Science Publishers.
Pelletization of pristine Pteris vittata L. pinnae powder and its application as a biosorbent of Cd(II) and Cr(VI)
(Springer Nature, 2020) Prabhu, S.G.; Srinikethan, G.; Hegde, S.
Mobility of toxic metals, originating from natural or anthropogenic sources, from soil to groundwater is a matter of utmost concern to human health. Remediation of the contaminated groundwater is of the highest priority as groundwater is an alternate source of freshwater that is used all over the world for drinking purpose. Hence, in the present study, Pteris vittata L. is used as a simple, biodegradable and efficient biosorbent of toxic metals in its non-living and pelletized form by employing organic binders and a simple manual pellet press. The capacity of the pelletized Pteris vittata L. to sequester the metals Cd(II) and Cr(VI) from an aqueous solution is determined through the study on the effect of operating conditions, isotherm and kinetic models. The metal removal capacity of the biosorbent pelletized using corn starch as the binder is 13.51 mg/g for Cd(II) at pH 6 and 1.66 mg/g for Cr(VI) at pH 2 as obtained from the Langmuir isotherm model. The diffusion of the metal ions into the micropores of the pellets aids its biosorption. Physical adsorption, ion exchange, covalent bonding and complexation are deduced to be few of the biosorption mechanisms involved. The findings contribute to the existing data in the biosorption technology. The novelty lies in the use of a weedy fern, Pteris vittata L., pelletized with desired structural characteristics as a potential low-cost biosorbent of toxic metals from groundwater. © 2019, Springer Nature Switzerland AG.
Spontaneous Cr(VI) and Cd(II) biosorption potential of native pinnae tissue of Pteris vittata L., a tropical invasive pteridophyte
(2019) Prabhu, S.G.; Srinikethan, G.; Hegde, S.
Heavy metal pollution is a prevalent and critical environmental concern. Its rampancy is attributed to indiscriminate anthropogenic activities. Several technologies including biosorption have been continuously researched upon to overcome the limitations of the conventional method of treatments in removal of heavy metals. Biosorption technology involves the application of a biomass in its nonliving form. Pteris vittata L., a pteridophyte, considered as an invasive weed was investigated in the present study as a potential decontaminant of toxic metals, Cr(VI) and Cd(II). The adsorption capacity of the biosorbent for Cr(VI) and Cd(II) under equilibrium conditions was investigated. The morphology, elemental composition, functional groups, and thermal stability of the biosorbent before and after metal loading were evaluated. At 303 K and an equilibrium time of 120 min, the maximum loading of Cr(VI) on the biosorbent was estimated to be 166.7 mg/g at pH 2 and Cd(II) to be 31.3 mg/g at pH 6. Isotherm models, kinetic studies, and thermodynamic studies indicated the mechanisms, chemisorption, ion exchange and intraparticle diffusion, controlling the Cr(VI) and Cd(II) uptake, respectively. The interactive effect of multi-metal ions in binary component systems was synergistic for Cd(II) uptake. The results validate the toxic metal removal potency of the biosorbent. 2019, 2019 Taylor & Francis Group, LLC.
Spontaneous Cr(VI) and Cd(II) biosorption potential of native pinnae tissue of Pteris vittata L., a tropical invasive pteridophyte
(Taylor and Francis Inc. 325 Chestnut St, Suite 800 Philadelphia PA 19106, 2019) Prabhu, S.G.; Srinikethan, G.; Hegde, S.
Heavy metal pollution is a prevalent and critical environmental concern. Its rampancy is attributed to indiscriminate anthropogenic activities. Several technologies including biosorption have been continuously researched upon to overcome the limitations of the conventional method of treatments in removal of heavy metals. Biosorption technology involves the application of a biomass in its nonliving form. Pteris vittata L., a pteridophyte, considered as an invasive weed was investigated in the present study as a potential decontaminant of toxic metals, Cr(VI) and Cd(II). The adsorption capacity of the biosorbent for Cr(VI) and Cd(II) under equilibrium conditions was investigated. The morphology, elemental composition, functional groups, and thermal stability of the biosorbent before and after metal loading were evaluated. At 303 K and an equilibrium time of 120 min, the maximum loading of Cr(VI) on the biosorbent was estimated to be 166.7 mg/g at pH 2 and Cd(II) to be 31.3 mg/g at pH 6. Isotherm models, kinetic studies, and thermodynamic studies indicated the mechanisms, chemisorption, ion exchange and intraparticle diffusion, controlling the Cr(VI) and Cd(II) uptake, respectively. The interactive effect of multi-metal ions in binary component systems was synergistic for Cd(II) uptake. The results validate the toxic metal removal potency of the biosorbent. © 2019, © 2019 Taylor & Francis Group, LLC.
Surface treated Pteris vittata L. pinnae powder used as an efficient biosorbent of Pb(II), Cd(II), and Cr(VI) from aqueous solution
(2018) Prabhu, S.G.; Srinikethan, G.; Hegde, S.
Biosorption is a surface-dependent phenomenon. Surface modifications by chemical treatment methods could either improve or reduce the biosorption capacity of potential biosorbents. In the present work, pristine Pteris vittata L. pinnae (PPV) powder was treated separately with sodium hydroxide (NaOH), calcium chloride (CaCl2), and nitric acid (HNO3). The pristine and treated biosorbents were used to assess the biosorption of Pb(II), Cd(II), and Cr(VI) as a function of pH. Kinetics and adsorption isotherms were studied. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and scanning electron microscope combined with energy dispersive x-ray (SEM-EDX) spectroscopic techniques were used to characterize the biosorbents before and after chemical treatments. The possible functional groups contributing to the metal sorption were identified. Results revealed favorable biosorption of Pb(II), Cd(II), and Cr(VI) described by pseudo-second order kinetics. NaOH-treated P. vittata (NPV) showed higher biosorption capacity for Pb(II) and Cd(II) compared to that of PPV. ATR-FTIR studies indicated that -OH, -COOH, and -NH2 groups were mainly involved in Cr(VI) and -OH in Pb(II) and Cd(II) biosorption. The enhanced efficiency of NPV and CaCl2 treated P. vittata (CPV) in the uptake of Pb(II) and Cd(II) compared to PPV can be associated with their altered physicochemical characters. 2018, 2018 Taylor & Francis Group, LLC.
Surface treated Pteris vittata L. pinnae powder used as an efficient biosorbent of Pb(II), Cd(II), and Cr(VI) from aqueous solution
(Taylor and Francis Inc. 325 Chestnut St, Suite 800 Philadelphia PA 19106, 2018) Prabhu, S.G.; Srinikethan, G.; Hegde, S.
Biosorption is a surface-dependent phenomenon. Surface modifications by chemical treatment methods could either improve or reduce the biosorption capacity of potential biosorbents. In the present work, pristine Pteris vittata L. pinnae (PPV) powder was treated separately with sodium hydroxide (NaOH), calcium chloride (CaCl2), and nitric acid (HNO3). The pristine and treated biosorbents were used to assess the biosorption of Pb(II), Cd(II), and Cr(VI) as a function of pH. Kinetics and adsorption isotherms were studied. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and scanning electron microscope combined with energy dispersive x-ray (SEM-EDX) spectroscopic techniques were used to characterize the biosorbents before and after chemical treatments. The possible functional groups contributing to the metal sorption were identified. Results revealed favorable biosorption of Pb(II), Cd(II), and Cr(VI) described by pseudo-second order kinetics. NaOH-treated P. vittata (NPV) showed higher biosorption capacity for Pb(II) and Cd(II) compared to that of PPV. ATR-FTIR studies indicated that -OH, -COOH, and -NH2 groups were mainly involved in Cr(VI) and -OH in Pb(II) and Cd(II) biosorption. The enhanced efficiency of NPV and CaCl2 treated P. vittata (CPV) in the uptake of Pb(II) and Cd(II) compared to PPV can be associated with their altered physicochemical characters. © 2018, © 2018 Taylor & Francis Group, LLC.