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Patil, Shailaja R.,Mote, Umesh S.,Patil, Shivajirao R.,Kolekar, Govind B. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
A simple, rapid, practical and sensitive spectofluorimetric method was developed for the determination of trace amount of heparin (Hep). Under the Optimum conditions, we studied the interaction between NFLX-Ce$^{3+}$-Hep complex by using absorption and fluorescence spectra. It was observed that Hep remarkably enhance the fluorescence intensity of the NFLX-Ce$^{3+}$ complex at ${\lambda}$= 356 nm in the buffer solution of pH = 7.60 and the enhancement effect is shown to relate with the concentration of Hep. The linear range and detection limit for the determination of Hep was obtained. By the Rosenthal graphic method, the association constant (K) and binding numbers (N) of Hep with probe were investigated. This method is relatively free of interference from coexisting substances and successfully applied for the determination of heparin in heparin sodium injection samples. A suitable mechanism of fluorescence enhancement between NFLX-Ce$^{3+}$ and the NFLX-Ce$^{3+}$-Hep systems were proposed and discussed.
Shailaja R. Patil,Umesh S. Mote,Shivajirao R. Patil,Govind B. Kolekar 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
A simple, rapid, practical and sensitive spectofluorimetric method was developed for the determination of trace amount of heparin (Hep). Under the Optimum conditions, we studied the interaction between NFLX-Ce3+-Hep complex by using absorption and fluorescence spectra. It was observed that Hep remarkably enhance the fluorescence intensity of the NFLX-Ce3+ complex at λ = 356 nm in the buffer solution of pH = 7.60 and the enhancement effect is shown to relate with the concentration of Hep. The linear range and detection limit for the determination of Hep was obtained. By the Rosenthal graphic method, the association constant (K) and binding numbers (N) of Hep with probe were investigated. This method is relatively free of interference from coexisting substances and successfully applied for the determination of heparin in heparin sodium injection samples. A suitable mechanism of fluorescence enhancement between NFLX-Ce3+ and the NFLX-Ce3+-Hep systems were proposed and discussed.
Nakate, Umesh T.,Lee, Gun Hee,Ahmad, Rafiq,Patil, Pramila,Bhopate, Dhanaji P.,Hahn, Y.B.,Yu, Y.T.,Suh, Eun-kyung Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.13
<P><B>Abstract</B></P> <P>High quality nanocrystalline NiO nanoplates were synthesized using surfactant and template free hydrothermal route. The gas sensing properties of NiO nanoplates were investigated. The nanoplates morphology of NiO with average thickness ~ 20 nm and diameter ~ 100 nm has been confirmed by FE-SEM and TEM. Crystalline quality of NiO has been studied using HRTEM and SAED techniques. Structural properties and elemental compositions have been analyzed by XRD and energy dispersive spectrometer (EDS) respectively. The detailed investigation of structural parameters has been carried out. The optical properties of NiO were analyzed from UV–Visible and photoluminescence spectra. NiO nanoplates have good selectivity towards hydrogen (H<SUB>2</SUB>) gas. The lowest H<SUB>2</SUB> response of 3% was observed at 2 ppm, whereas 90% response was noted for 100 ppm at optimized temperature of 200 °C with response time 180 s. The H<SUB>2</SUB> responses as functions of different operating temperature as well as gas concentrations have been studied along with sensor stability. The hydrogen sensing mechanism was also elucidated.</P>
Nano-bitter gourd like structured CuO for enhanced hydrogen gas sensor application
Nakate, Umesh T.,Lee, Gun Hee,Ahmad, Rafiq,Patil, Pramila,Hahn, Yoon-Bong,Yu, Y.T.,Suh, Eun-kyung Elsevier 2018 International journal of hydrogen energy Vol.43 No.50
<P><B>Abstract</B></P> <P>Hydrogen gas sensing were investigated using nano-bitter gourd like structured CuO material synthesized via a chemical route. Morphology of CuO was revealed using FE-SEM and TEM image analysis. CuO phase confirmation and molecular structural fingerprint were verified by XRD and Raman analysis respectively. Elemental composition and atomic states of elements were investigated by EDS and XPS techniques respectively. A remarkable high gas response of 175% was recorded by CuO sensor towards 100 ppm hydrogen (H<SUB>2</SUB>) at the operating temperature 200 °C with response time 150 s. The lowest detection of H<SUB>2</SUB> was observed at 2 ppm concentration with the gas response of 5%. The gas response was studied as functions of different operating temperatures and concentrations. Transient gas response and stability were also confirmed for CuO sensor. Hydrogen sensing mechanism of CuO sensor was elucidated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nano-bitter gourd like structured CuO via chemical route. </LI> <LI> CuO sensor exhibits high response and good selectivity towards H<SUB>2</SUB> gas at 200 °C. </LI> <LI> CuO sensor works in H<SUB>2</SUB> gas concentration 2 ppm- 100 ppm at 200 °C. </LI> <LI> CuO sensor shows continuous transient response for concentration 100 ppm − 2 ppm. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Chembazhi, Ullas Valiya,Patil, Vinod Vikas,Sah, Shivjee,Reeve, Wayne,Tiwari, Ravi P.,Woo, Euijeon,Varshney, Umesh Oxford University Press 2017 Nucleic acids research Vol.45 No.10
<P><B>Abstract</B></P><P>Repair of uracils in DNA is initiated by <B>u</B>racil <B>D</B>NA <B>g</B>lycosylases (UDGs). Family 1 UDGs (Ung) are the most efficient and ubiquitous proteins having an exquisite specificity for uracils in DNA. Ung are characterized by motifs A (GQDPY) and B (HPSPLS) sequences. We report a novel dimeric UDG, Blr0248 (<I>Bdi</I>Ung) from <I>Bradyrhizobium diazoefficiens</I>. Although <I>Bdi</I>Ung contains the motif A (GQDPA), it has low sequence identity to known UDGs. <I>Bdi</I>Ung prefers single stranded DNA and excises uracil, 5-hydroxymethyl-uracil or xanthine from it. <I>Bdi</I>Ung is impervious to inhibition by AP DNA, and Ugi protein that specifically inhibits family 1 UDGs. Crystal structure of <I>Bdi</I>Ung shows similarity with the family 4 UDGs in its overall fold but with family 1 UDGs in key active site residues. However, instead of a classical motif B, <I>Bdi</I>Ung has a uniquely extended protrusion explaining the lack of Ugi inhibition. Structural and mutational analyses of <I>Bdi</I>Ung have revealed the basis for the accommodation of diverse substrates into its substrate binding pocket. Phylogenetically, <I>Bdi</I>Ung belongs to a new UDG family. <I>Bradyrhizobium diazoefficiens</I> presents a unique scenario where the presence of at least four families of UDGs may compensate for the absence of an efficient family 1 homologue.</P>
Chodsana Sriket,Phanat Kittiphattanabawon,Umesh Patil,Soottawat Benjakul,Theeraphol Senphan,Sitthipong Nalinanon 한국식품영양과학회 2023 Preventive Nutrition and Food Science Vol.28 No.4
In this study, we investigated the impact of lipid oxidation on the discoloration of Sawai (Pangasianodon hypophthalmus) lipids and proteins. Sawai microsomes, liposomes, and salt-soluble myofibrillar proteins were prepared and subjected to lipid oxidation process. The results revealed that the levels of thiobarbituric acid-reactive substances, yellowness (as indicated by b<SUP>*</SUP> values), and pyrrole compounds increased when Sawai liposomes and microsomes were oxidized using iron and ascorbate. Meanwhile, the levels of free amines decreased, particularly as the iron content (25∼100 M) and incubation time (0∼20 h) increased. The impact of oxidized liposomes at different levels (1, 2, and 5%) on the salt-soluble Sawai myofibrillar proteins was also evaluated. The findings revealed that lipid oxidation products reduced the sulfhydryl content and increased the surface hydrophobicity and carbonyl content of the salt-soluble Sawai myofibrillar proteins. These results imply that the formation of yellow discoloration in Sawai muscle could be due to nonenzymatic browning reactions occurring between lipid oxidation products and amines in the muscle protein.
Priyal Jain,Prakash Kumar Sharma,Rajesh Singh Pawar,Umesh Kumar Patil,Pradeep Kumar Singour,Harish Rajak 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.7
Selective GABAA receptor ligands are widely used clinically to reduce the occurrence of convulsions. Hence there is an intense interest in developing new benzimidazole derivatives demonstrating high selectivity and high affinity for GABAA receptors. With the purpose of designing new chemical entities with an enhanced binding affinity for GABAA/BZd receptor complex, we carried out a QSAR study on benzotriazine derivatives. We studied 28 potent GABAA receptor ligands; derivatives of benzotriazines, using a combination of various tested physicochemical, steric, electronic and thermodynamic descriptors to determine the quantitative correlation between binding affinity and structural features. The developed and validated final model showed a good correlative and predictive ability expressed by a squared correlation co-efficient (r2) of 0.954. The equation indicated that the binding affinity is strongly dependent upon the thermodynamic properties (CDE, DDE and PC). Correlation between these properties and anticonvulsant activity was used to synthesize compounds possessing potent anticonvulsant activity. Most of the compounds showed an ability to inhibit the maximum electroshock (MES) and pentylenetetrazole (PTZ)-induced convulsions. Compound 1A, i.e. 2-(4-Chloro-phenyl)-5-nitro-1H-benzimidazole exhibited maximum activity in both the convulsion models.