1
|
Cao X, Ahammed SM, Datta S, Chowdhury J, Roy PK. Enhancement of Biodiesel Production via Ultrasound Technology: A Mathematical Study. ACS Omega 2024; 9:20502-20511. [PMID: 38737013 PMCID: PMC11080012 DOI: 10.1021/acsomega.4c01729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 03/28/2024] [Accepted: 04/09/2024] [Indexed: 05/14/2024]
Abstract
Biodiesel is one of the alternative renewable energy sources that has received a lot of attention since it is clean, green energy. Different sources can be used for the production of biodiesel, but the most appropriate and economical method relies on the transesterification of methanol with the nonedible vegetable oil from the fruit of the Jatropha curcas plant. Molar ratio, vessel diameter, catalyst concentration, and ultrasound all have a substantial influence on the synthesis of biodiesel by the transesterification process. Among these factors, the diameter of the vessel and the ultrasonic effect through mass transfer limitations have a significant impact on successful reaction completion. In this research work, we have developed a mathematical model to analyze the three-step transesterification process and side saponification reaction in the presence of a potassium hydroxide catalyst. The model considers the influence of mixing intensity variations, including ultrasound, on the mass transfer in different phases. The mass transfer rate is calculated using the modified Dittus-Boelter correlation. An optimal control approach through the minimum principle by Pontryagin is applied to maximize the production of biodiesel at minimal cost. The novelty of this research, which we have derived from our analytical as well as numerical results, considering industrial processes, is that more than 97% biodiesel yield conversion is to be obtained at 50 kHz ultrasound frequency, a 6:1 methanol-to-Jatropha-oil molar ratio, and 1 m of vessel diameter within 50 min using optimal control theory.
Collapse
Affiliation(s)
- Xianbing Cao
- School
of Mathematics and Statistics, Beijing Technology
and Business University, Beijing 100048, China
| | | | - Siddhartha Datta
- Department
of Chemical Engineering, Jadavpur University, Kolkata 700032, India
| | - Jahangir Chowdhury
- Department
of Applied Science, RCC Institute of Information
Technology, Kolkata 700015, India
| | - Priti Kumar Roy
- Department
of Mathematics, Jadavpur University, Kolkata 700032, India
| |
Collapse
|
2
|
Begum S, Parvej H, Dalui R, Paul S, Maity S, Sepay N, Afzal M, Chandra Halder U. Structural modulation of insulin by hydrophobic and hydrophilic molecules. RSC Adv 2023; 13:34097-34106. [PMID: 38019994 PMCID: PMC10662218 DOI: 10.1039/d3ra06647a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 11/13/2023] [Indexed: 12/01/2023] Open
Abstract
In the bloodstream, insulin interacts with various kinds of molecules, which can alter its structure and modulate its function. In this work, we have synthesized two molecules having extremely hydrophilic and hydrophobic side chains. The effects of hydrophilic and hydrophobic molecules on the binding with insulin have been investigated through a multi-spectroscopic approach. We found that hydrophilic molecules have a slightly higher binding affinity towards insulin. Insulin can bind with the hydrophilic molecules as it binds glucose. The high insulin binding affinity of a hydrophobic molecule indicates its dual nature. The hydrophobic molecule binds at the hydrophobic pocket of the insulin surface, where hydrophilic molecules interact at the polar surface of the insulin. Such binding with the hydrophobic molecule perturbs strongly the secondary structure of the insulin much more in comparison to hydrophilic molecules. Therefore, the stability of insulin decreases in the presence of hydrophobic molecules.
Collapse
Affiliation(s)
- Shahnaz Begum
- Department of Chemistry, Jadavpur University Kolkata-700032 India
| | - Hasan Parvej
- Department of Chemistry, Jadavpur University Kolkata-700032 India
| | - Ramkrishna Dalui
- Department of Chemistry, Jadavpur University Kolkata-700032 India
| | - Swarnali Paul
- Department of Chemistry, Jadavpur University Kolkata-700032 India
| | - Sanhita Maity
- Department of Chemistry, Jadavpur University Kolkata-700032 India
| | - Nayim Sepay
- Department of Chemistry, Lady Brabourne College Kolkata-700017 India
| | - Mohd Afzal
- Department of Chemistry, College of Science, King Saud University Riyadh 11451 Saudi Arabia
| | | |
Collapse
|
3
|
Bera K, Chowdhury A, Bera SK, Das MR, Roy A, Das S, Bhattacharya SK. Pd Nanoparticle-Decorated Novel Ternary Bi 2O 2CO 3-Bi 2MoO 6-CuO Heterojunction for Enhanced Photo-electrocatalytic Ethanol Oxidation. ACS Omega 2023; 8:28419-28435. [PMID: 37576621 PMCID: PMC10413847 DOI: 10.1021/acsomega.3c02669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 07/12/2023] [Indexed: 08/15/2023]
Abstract
Recently, photo-electrooxidation of fuel using a noble metal-semiconductor junction has been one of the most promising approaches in fuel cell systems. Herein, we report the development of a Pd-supported Bi2MoO6-Bi2O2CO3-CuO novel ternary heterojunction for ethanol oxidation in alkali in the presence and absence of visible light. Various spectroscopic and microscopic characterization techniques confirm strong coupling between palladium nanoparticles and Bi2MoO6-Bi2O2CO3-CuO ternary heterojunction supports. The photo-electrocatalytic efficacy of the synthesized catalysts was inspected by cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). The CV study reveals that the forward peak current density (in mA mg-1 of Pd) of the synthesized quaternary heterojunction was about 1482.5, which is 2.4, 4, and 4.6 times higher than that of Pd/CuO (608.3), Pd/Bi2MoO6-Bi2O2CO3 (368.3), and similarly synthesized Pd catalyst (321.5) under visible light radiation. The best heterojunction catalyst shows 2.21-fold higher peak current density in visible light compared to that in dark. CA study reveals that after operation for 6000 s, the current density of the quaternary electrode is 1.5 and 3.4 times greater than that of Pd/CuO and Pd/C catalysts, respectively. The greater photocurrent response, lower photoluminescence (PL) emission intensity, and smaller semicircle arc in the Nyquist plot of the quaternary catalyst demonstrate the efficient segregation and higher charge transfer conductance of photogenerated charges to facilitate the photo-electrooxidation process of ethanol. The stability test shows that the quaternary catalyst loses only 9.8 and 7.7% of its maximum current density after 500 cycles of CV operation in the dark and light, respectively, indicating that light energy is more beneficial in establishing high stability. The dramatic enhancement of the photo-electrocatalytic activity of the quaternary electrode is owing to the lower band gap, high ECSA, enhanced charge separation of photogenerated carriers (e--h+), and all cocatalytic support of Bi2MoO6, Bi2O2CO3, and CuO in Pd/ Bi2MoO6-Bi2O2CO3-CuO under visible light radiation. The morphology and structure of the used quaternary catalyst are tested using FESEM and PXRD. Finally, ex situ FTIR spectroscopy and HPLC techniques help understand the ethanol electrooxidation reaction mechanism.
Collapse
Affiliation(s)
- Kamal
Kanti Bera
- Physical
Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Anupam Chowdhury
- Physical
Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Shyamal Kanti Bera
- School
of Chemical Science, National Institute
of Science Education and Research (NISER), Bhubaneswar 752050, India
| | - Mahima Ranjan Das
- Department
of Physics, The University of Burdwan, Burdwan 713104, India
| | - Atanu Roy
- Department
of Instrumentation Science, Jadavpur University, Kolkata 700032, India
| | - Sachindranath Das
- Department
of Instrumentation Science, Jadavpur University, Kolkata 700032, India
| | | |
Collapse
|
4
|
Ghosh S, Das B, Haldar PK, Kar A, Chaudhary SK, Singh KO, Bhardwaj PK, Sharma N, Mukherjee PK. 6-Gingerol contents of several ginger varieties of Northeast India and correlation of their antioxidant activity in respect to phenolics and flavonoids contents. Phytochem Anal 2023; 34:259-268. [PMID: 36594354 DOI: 10.1002/pca.3201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/02/2022] [Accepted: 11/02/2022] [Indexed: 06/17/2023]
Abstract
INTRODUCTION Ginger constitutes the rhizome part of the plant Zingiber officinale from the Zingiberaceae family. A large number of ginger varieties with high sensorial and functional quality are found in Northeast India. Hence, phytopharmacological screening of different ginger varieties is essential that will serve as a guideline in applied research to develop high-end products and improve economical margins. OBJECTIVE To determine the variation in total phenolics content (TPC), total flavonoids content (TFC), and antioxidant activities and correlate that with 6-gingerol contents of different ginger varieties collected from Northeast India using Pearson's correlation analysis. MATERIALS AND METHODS The TPC and TFC values were determined using standard methods. Antioxidant activities were measured using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and hydroxyl radical scavenging assays, while reversed-phase high-performance liquid chromatography (RP-HPLC) analysis was utilised for quantitative determination of 6-gingerol content. RESULTS The result revealed that ginger variety 6 (GV6) contains the highest 6-gingerol content and TPC value showing maximum antioxidant activity, followed by GV5, GV4, GV9, GV3, GV2, GV8, GV1, and GV7. The findings also suggested that the antioxidant activity has much better correlations with TPC as compared with TFC values. Pearson's correlation analysis showed a significant correlation between 6-gingerol contents and TPC values. CONCLUSION This work underlines the importance of ginger varieties from Northeast India as a source of natural antioxidants with health benefits.
Collapse
Affiliation(s)
- Suparna Ghosh
- School of Natural Product Studies, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
| | - Bhaskar Das
- School of Natural Product Studies, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
- Institute of Bioresources and Sustainable Development, Imphal, India
| | - Pallab Kanti Haldar
- School of Natural Product Studies, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
| | - Amit Kar
- Institute of Bioresources and Sustainable Development, Imphal, India
| | | | | | | | - Nanaocha Sharma
- Institute of Bioresources and Sustainable Development, Imphal, India
| | - Pulok K Mukherjee
- School of Natural Product Studies, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
- Institute of Bioresources and Sustainable Development, Imphal, India
| |
Collapse
|
5
|
Banerjee S, Baidya SK, Adhikari N, Jha T, Ghosh B. Hydrazides as Potential HDAC Inhibitors: Structure-activity Relationships and Biological Implications. Curr Top Med Chem 2023; 23:2343-2372. [PMID: 37038677 DOI: 10.2174/1568026623666230405124207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 04/12/2023]
Abstract
Epigenetic modulations by HDACs are associated with multiple disease conditions. In this context, HDACs play vital roles in the progression of diseases including several cancers, neurodegenerative diseases, inflammatory diseases, and metabolic disorders. Though several HDAC inhibitors have been established as drug candidates, their usage has been restricted because of broad-spectrum inhibition, highly toxic character, and off-target adverse effects. Therefore, specific HDAC selectivity is essential to get rid of such adverse effects. Hydrazide-based compounds have already been proven to exert higher inhibitory efficacy and specific HDAC selectivity. In this article, the detailed structure-activity relationship (SAR) of the existing hydrazide-based HDAC inhibitors has been elucidated to gather crucial information that can be utilized further for the development of promising drug candidates for combating diverse diseases in the future.
Collapse
Affiliation(s)
- Suvankar Banerjee
- Natural Science Laboratory, Division of Medicinal and Pharmaceutical Chemistry, Department of Pharmaceutical Technology, P.O. Box 17020, Jadavpur University, Kolkata, 700032, West Bengal, India
| | - Sandip Kumar Baidya
- Natural Science Laboratory, Division of Medicinal and Pharmaceutical Chemistry, Department of Pharmaceutical Technology, P.O. Box 17020, Jadavpur University, Kolkata, 700032, West Bengal, India
| | - Nilanjan Adhikari
- Natural Science Laboratory, Division of Medicinal and Pharmaceutical Chemistry, Department of Pharmaceutical Technology, P.O. Box 17020, Jadavpur University, Kolkata, 700032, West Bengal, India
| | - Tarun Jha
- Natural Science Laboratory, Division of Medicinal and Pharmaceutical Chemistry, Department of Pharmaceutical Technology, P.O. Box 17020, Jadavpur University, Kolkata, 700032, West Bengal, India
| | - Balaram Ghosh
- Epigenetic Research Laboratory, Department of Pharmacy, Birla Institute of Technology and Science-Pilani, Hyderabad Campus, Shamirpet, Hyderabad, 500078, India
| |
Collapse
|
6
|
Maiti P, Saren U, Chakraborty U, Singha T, Paul S, Paul PK. Comparative and Selective Interaction of Amino Acid d-Cysteine with Colloidal Gold Nanoparticles in the Presence of a Fluorescent Probe in Aqueous Medium. ACS Omega 2022; 7:29013-29026. [PMID: 36033694 PMCID: PMC9404198 DOI: 10.1021/acsomega.2c02725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 08/01/2022] [Indexed: 05/20/2023]
Abstract
In this communication, we report the comparative and selective interaction of amino acid d-cysteine (d-Cys) with citrate caped gold nanoparticles (Au NPs) in the presence of a fluorescent dye, rhodamine B (RhB), in aqueous solution. Au NPs of size 27.5 nm could almost fully quench the steady-state fluorescence emission of RhB at their optimum concentrations in the mixed solution. The interactions of d-Cys, l-Cys, all other relevant d- and l-amino acids, neurotransmitters, and other relevant biological compounds with the Au NPs/RhB mixed solution have been explored by monitoring the fluorescence recovery efficiencies from the almost fully quenched state of RhB fluorescence via a simple steady-state spectrofluorometric method. The higher fluorescence recovery for the interaction of d-Cys with the Au NPs/RhB mixed system is accompanied by a distinct color change (red-wine to bluish-black) of the assay medium after the reaction compared to that of all other interfering compounds considered in this work. The sensitivity of this fluorometric response lies in a broad linear range of concentrations of d-Cys and the limit of detection (LOD) is found to be 4.2 nM, which is low compared to many other methods available in the literature. The different degrees of interaction of d-Cys and l-Cys with the Au NPs/RhB mixed sample have been further explored by circular dichroism (CD) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The selective interaction of d-Cys with the proposed Au NPs/RhB mixed system is also found to be correlated with interparticle cross-linking and aggregations of nanoparticles by the analysis of ζ potential and dynamic light scattering (DLS) study, transmission electron microscopy (TEM), atomic force microscopy (AFM), UV-vis absorption spectroscopy etc. The proposed interaction mechanism is further studied with a normal human urine sample to elucidate that the optimized combination of Au NPs and RhB may be realized as an efficient platform for detection of the amino acid d-Cys in a real biosample via a simple fluorometric approach.
Collapse
Affiliation(s)
- Pradip Maiti
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Ujjal Saren
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Utsav Chakraborty
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Tanmoy Singha
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Sharmistha Paul
- West
Bengal State Council of Science and Technology, Department of Science and Technology and Biotechnology, Vigyan Chetana Bhavan, Sector-I, Salt Lake, Kolkata 700064, India
| | - Pabitra Kumar Paul
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
- , . Phone: +91-9477631142 (M), +91-33-24138917 (O). Fax:
+91-33-24138917 (O)
| |
Collapse
|
7
|
Patra R, Mondal S, Sinha D, Rajak KK. Mono Versus Dinuclear Vanadium(V) Complexes: Solvent Dependent Structural Versatility and Electro Syntheses of Mixed-Valence Oxovanadium(IV/V) Entities in Solution. ACS Omega 2022; 7:11710-11721. [PMID: 35449931 PMCID: PMC9017103 DOI: 10.1021/acsomega.1c06713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 02/08/2022] [Indexed: 06/14/2023]
Abstract
Two mononuclear oxidovanadium(V) complexes type of [VVO(L1)(OMe)(MeOH)] (1), [VVO(L2)(OMe)(MeOH)] (2) and two [V2O3]4+ core of μ-oxidodioxidodivanadium(V) complexes (L1)(O)VV-O-VV(O)(L1) (3) and (L2)(O)VV-O-VV(O)(L2) (4) and two complexes [VVO(L1)(8-Hq)] (5) and [VVO(L2)(8-Hq)] (6) incorporating 8-hydroxyquinoline (8-hq) as co-ligand have been reported where L1 [(E)-N'-(2-hydroxybenzylidene)cinnamohydrazide] and L2 [(2E,N'E)-N'-(2-hydroxybenzylidene)-3-(naphthalen-1-yl)acrylohydrazide] are the dianionic forms of the conjugated keto-imine functionalized substituted hydrazone ligands. The μ-oxidodioxidodivanadium complexes are generated upon switching the solvent from methanol to acetonitrile. The X-ray analysis showed octahedral geometry for the mononuclear complexes 1, 2 and 5 but oxido-bridged dinuclear complexes 3 and 4 formed penta-coordinated square-pyramidal geometry about metal atoms. Two mixed-valence species of type II, 3a and 4a, of general formulae (L)(O)VIV-O-VV(O)(L), are being generated upon constant potential electrolysis (CPE) of 3 and 4 respectively. Frozen solution EPR spectra have 13 hyperfine lines, revealing the unpaired electron is majorly localized on one of the two vanadium centres. All these complexes have been well characterized by physio-chemical techniques and the density functional theory (DFT) calculations were applied to obtain further insight into the electronic structure of this type of molecule. The oxidomethoxido complexes 1 and 2 were taken to investigate the catechol oxidase mimicking activity following the oxidation of 3,5-di-tert-butyl catechol (3,5-DTBC) to 3,5-di-tert-butyl benzoquinone (3,5-DTBQ).
Collapse
Affiliation(s)
- Roumi Patra
- Inorganic
Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Sandip Mondal
- Inorganic
Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
- Department
of Chemistry, Darjeeling Govt. College, Darjeeling 734101, India
| | - Debopam Sinha
- Inorganic
Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Kajal Krishna Rajak
- Inorganic
Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| |
Collapse
|
8
|
Nandy P, Santra RC, Lahiri D, Nag M, Das S. In Situ Reactivity of Electrochemically Generated Nitro Radical Anion on Tinidazole and Its Monomeric and Dimeric Cu II Complexes on Model Biological Targets with Relative Manifestation of Preventing Bacterial Biofilm Formation. ACS Omega 2022; 7:8268-8280. [PMID: 35309450 PMCID: PMC8928527 DOI: 10.1021/acsomega.1c04822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 02/10/2022] [Indexed: 06/14/2023]
Abstract
Formation of nitro radical anion (-NO2 •-) and other reduction products of 5-nitroimidazoles, although important for antimicrobial activity, makes the drugs neurotoxic. Hence, an appropriate generation and their role in the free radical pathway needs proper realization. This was attempted by studying the action of tinidazole and its CuII complexes on model targets (nucleic acid bases and calf thymus DNA). Results obtained were correlated with studies on biological species where prevention of biofilm formation on Staphylococcus aureus and Pseudomonas aeruginosa was followed. Tinidazole and its CuII complexes subjected to electrochemical reduction in aqueous solution, under de-aerated conditions, interact with model nucleic acid bases and calf thymus DNA. These model targets were followed to realize what happens when such compounds undergo enzymatic reduction within cells of microorganisms that they eventually kill. Studies reveal that CuII complexes were better in modifying nucleic acid bases and calf thymus DNA than tinidazole; damage caused to nucleic acid bases was correlated with that caused to DNA, indicating that compounds affect DNA rich in thymine and adenine. Minimum bactericidal concentrations on sessile S. aureus and P. aeruginosa for the monomeric CuII complex were 12.5 and 20.25 μM respectively, while those for the dimeric complex were 40.0 and 45.0 μM, respectively. Biofilm formation by P. aeruginosa and S. aureus and viability count of sessile cells were also determined. CuII complexes of tinidazole brought about substantial reduction in carbohydrate and protein content in S. aureus and P. aeruginosa. Downregulation of quorum sensing signaling mechanism viz. reduced production of pyocyanin and elastase during biofilm formation was also detected. CuII complexes showed much higher tendency to prevent biofilm formation than tinidazole, almost comparable to amoxicillin, an established drug in this regard.
Collapse
Affiliation(s)
- Promita Nandy
- . Department of
Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700 032, India
| | - Ramesh C. Santra
- . Department of
Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700 032, India
| | - Dibyajit Lahiri
- Department
of Biotechnology, University of Engineering
and Management, Kolkata 700 156, India
| | - Moupriya Nag
- Department
of Biotechnology, University of Engineering
and Management, Kolkata 700 156, India
| | - Saurabh Das
- . Department of
Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700 032, India
| |
Collapse
|
9
|
Chatterjee S, Bhattacharya SK. Size-Dependent Catalytic Activity of PVA-Stabilized Palladium Nanoparticles in p-Nitrophenol Reduction: Using a Thermoresponsive Nanoreactor. ACS Omega 2021; 6:20746-20757. [PMID: 34423183 PMCID: PMC8374901 DOI: 10.1021/acsomega.1c00896] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 05/31/2021] [Indexed: 06/13/2023]
Abstract
Palladium nanoparticles (Pd NPs) of various average global diameters (2.1-7.1 nm) encapsulated with hydrophilic polymer polyvinyl alcohol (PVA) have been synthesized and used as catalysts for sodium borohydride assisted reduction of p-nitrophenol to p-aminophenol. The synthesized catalysts exhibit excellent and typical size-dependent catalytic activity in the green protocol. UV-visible absorption spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy were employed to characterize the prepared Pd NPs. The kinetics of this reaction was easily monitored by a UV-visible absorption spectrophotometer. The mechanism of the reaction is explained by the Langmuir-Hinshelwood model. The catalytic performance increases with decreasing size of the synthesized nanoparticles. The apparent rate constants (k app × 103/s-1) of the catalytic reduction in the presence of Pd NPs of average diameters of 2.1, 3.35, 6.2, and 7.1 nm are determined as 8.57, 7.67, 6.16, and 5.04, respectively, at 298 K by using 2.91 mol % palladium nanocatalyst in each case. Moreover, the estimated activation energy of 22.2 kJ mol-1 obtained for Pd NPs with the smallest average diameter of 2.1 nm is very low as reported in the literature for the reduction. The influences of catalyst dose and concentration of p-nitrophenol on catalytic reduction are fully investigated. The catalyst with the largest diameter shows a temperature-sensitive property that might be due to the presence of a very low amount of rapped PVA used as stabilizer during the fabrication process. Thus, the synthetic protocol provides a unique fabrication process of a catalytically active thermoresponsive nanoreactor consisting of Pd NPs encapsulated into a PVA stabilizing agent.
Collapse
Affiliation(s)
- Sujit Chatterjee
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | | |
Collapse
|
10
|
Chakraborty R, Samanta R, Das S. Preservation of Aloe vera and soybean flour fortified Granny Smith apple through optimised quartz-halogen radiated vacuum drying: kinetics and quality evaluation. J Sci Food Agric 2021; 101:3564-3574. [PMID: 33280107 DOI: 10.1002/jsfa.10983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 09/18/2020] [Accepted: 12/06/2020] [Indexed: 06/12/2023]
Abstract
BACKGROUND Granny Smith (GS) apple has low protein content and poor antimicrobial properties; hence it has been blended with Aloe vera (AV; high ascorbic acid, antimicrobial and antioxidant properties) and soybean flour (SF; rich in phenols, flavonoids, ascorbic acid, total antioxidant and protein) in different proportions to obtain fortified GS, i.e. GSAVSF. Moreover, GS being a perishable fruit, its moisture content should be reduced to enhance shelf life. Accordingly, this GSAVSF was osmotically pre-dehydrated and finally dried through energy-efficient quartz-halogen radiation (QHR) assisted vacuum-drying (QHRVD) to produce dried GSAVSF i.e. (DGSAVSF) under optimized conditions. RESULTS The optimally dehydrated DGSAVSF product resulted in minimum moisture (4.85% w/w) and maximum protein (6.24 g kg-1 ) content. The application of osmotic dehydration and QHRVD afforded acceptable colour of DGSAVSF compared to GSAVSF (ΔEI * = 10.07 ± 0.21). A parametric drying model was formulated that corroborated well with Fick's equation. QHRVD rendered high moisture diffusivity (1.49 × 10-8 m2 s-1 ) and low activation energy (27.64 kJ mol-1 K-1 ). Appreciable quality improvements with respect to fresh GS concerning ascorbic acid (176.05%), total phenolic (579.07%), total flavonoid (333.33%) contents and 2,2'-diphenyl-1-picrylhydrazyl radical scavenging activity (446.71%) could be achieved. The product demonstrated satisfactory shelf life (1 × 104 CFU g-1 : aerobic mesophilic; 1 × 104 CFU g-1 : mould and yeast) and high rehydration ratio (4.25 ± 0.1). CONCLUSION The enrichment of GS with AV and SF along with optimal drying protocols could provide a quality fortified DGSAVSF through an energy-proficient sustainable process. The highly nutritious product with suitable colour, microbial stability and rehydration ratio also satisfied a 9-point hedonic scale, thus confirming consumer acceptability. © 2020 Society of Chemical Industry.
Collapse
Affiliation(s)
- Rajat Chakraborty
- Department of Chemical Engineering, Jadavpur University, Kolkata, India
| | - Ritika Samanta
- Department of Chemical Engineering, Jadavpur University, Kolkata, India
| | - Sabyasachi Das
- Department of Chemical Engineering, Jadavpur University, Kolkata, India
| |
Collapse
|
11
|
Maity S, Sepay N, Pal S, Sardar S, Parvej H, Pal S, Chakraborty J, Pradhan A, Halder UC. Modulation of amyloid fibrillation of bovine β-lactoglobulin by selective methionine oxidation. RSC Adv 2021; 11:11192-11203. [PMID: 35423661 PMCID: PMC8695858 DOI: 10.1039/d0ra09060c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 03/05/2021] [Indexed: 12/13/2022] Open
Abstract
Deposition of oxidation-modified proteins during normal aging and oxidative stress are directly associated with systemic amyloidoses. Methionine (Met) is believed to be one of the most readily oxidisable amino acid residues of protein. Bovine beta-lactoglobulin (β-lg), a model globular whey protein, has been presented as a subsequent paradigm for studies on protein aggregation and amyloid formation. Herein, we investigated the effect of t-butyl hydroperoxide (tBHP)-induced oxidation on structure, compactness and fibrillation propensity of β-lg at physiological pH. Notably, whey protein modification, specifically Met residues, plays an important role in the dairy industry during milk processing and lowering nutritional value and ultimately affecting their technological properties. Several bio-physical studies revealed enhanced structural flexibility and aggregation propensity of oxidised β-lg in a temperature dependent manner. A molecular docking study is used to predict possible interactions with tBHP and infers selective oxidation of methionine residues at 7, 24 and 107 positions. From our studies, it can be corroborated that specific orientations of Met residues directs the formation of a partially unfolded state susceptible to fibrillation with possible different cytotoxic effects. Our studies have greater implications in deciphering the underlying mechanism of different whey proteins encountering oxidative stress. Our findings are also important to elucidate the understanding of oxidation induced amyloid fibrillation of protein which may constitute a new route to pave the way for a modulatory role of oxidatively stressed proteins in neurological disorders.
Collapse
Affiliation(s)
- Sanhita Maity
- Department of Chemistry, Jadavpur University Kolkata 700032 India
| | - Nayim Sepay
- Department of Chemistry, Jadavpur University Kolkata 700032 India
| | - Sampa Pal
- Department of Chemistry, Jadavpur University Kolkata 700032 India
| | - Subrata Sardar
- Department of Chemistry, Jadavpur University Kolkata 700032 India
| | - Hasan Parvej
- Department of Chemistry, Jadavpur University Kolkata 700032 India
| | - Swarnali Pal
- Department of Chemistry, Jadavpur University Kolkata 700032 India
| | - Jishnu Chakraborty
- Department of Chemistry, Camellia Institute of Engineering and Technology Budbud Burdwan WB India
| | - Anirban Pradhan
- Department of Chemistry, Ramakrishna Mission Residential College (Autonomous), Vivekananda Centre for Research Narendrapur Kolkata-700103 India
| | | |
Collapse
|
12
|
Zaki M, Hairat S, Aazam ES. Scope of organometallic compounds based on transition metal-arene systems as anticancer agents: starting from the classical paradigm to targeting multiple strategies. RSC Adv 2019; 9:3239-3278. [PMID: 35518979 PMCID: PMC9060267 DOI: 10.1039/c8ra07926a] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 12/26/2018] [Indexed: 02/02/2023] Open
Abstract
The advent of the clinically approved drug cisplatin started a new era in the design of metallodrugs for cancer chemotherapy. However, to date, there has not been much success in this field due to the persistence of some side effects and multi-drug resistance of cancer cells. In recent years, there has been increasing interest in the design of metal chemotherapeutics using organometallic complexes due to their good stability and unique properties in comparison to normal coordination complexes. Their intermediate properties between that of traditional inorganic and organic materials provide researchers with a new platform for the development of more promising cancer therapeutics. Classical metal-based drugs exert their therapeutic potential by targeting only DNA, but in the case of organometallic complexes, their molecular target is quite distinct to avoid drug resistance by cancer cells. Some organometallic drugs act by targeting a protein or inhibition of enzymes such as thioredoxin reductase (TrRx), while some target mitochondria and endoplasmic reticulum. In this review, we mainly discuss organometallic complexes of Ru, Ti, Au, Fe and Os and their mechanisms of action and how new approaches improve their therapeutic potential towards various cancer phenotypes. Herein, we discuss the role of structure-reactivity relationships in enhancing the anticancer potential of drugs for the benefit of humans both in vitro and in vivo. Besides, we also include in vivo tumor models that mimic human physiology to accelerate the development of more efficient clinical organometallic chemotherapeutics.
Collapse
Affiliation(s)
- Mehvash Zaki
- Department of Chemistry, King Abdulaziz University Jeddah Saudia Arabia +91 8979086156, +966 561835672
| | - Suboot Hairat
- Department of Biotechnology, Wachemo University Hossana Ethiopia
| | - Elham S Aazam
- Department of Chemistry, King Abdulaziz University Jeddah Saudia Arabia +91 8979086156, +966 561835672
| |
Collapse
|