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Article: Exploration of inhibitory action of Azo imidazole derivatives against COVID-19 main protease (M

Chhetri, Abhijit / Chettri, Sailesh / Rai, Pranesh / Sinha, Biswajit / Brahman, Dhiraj

2020 Volume 1224, Page(s) 129178

Abstract: Four novel ionic liquid tagged azo-azomethine derivatives (L1-L4) have been prepared by the condensation reaction of azo-coupled ortho-vaniline precursor with amino functionalised imidazole derivative and the synthesized derivatives (L1-L4) have been ... ...

Abstract	Four novel ionic liquid tagged azo-azomethine derivatives (L1-L4) have been prepared by the condensation reaction of azo-coupled ortho-vaniline precursor with amino functionalised imidazole derivative and the synthesized derivatives (L1-L4) have been characterized by different analytical and spectroscopic techniques. Molecular docking studies were carried out to ascertain the inhibitory action of studied ligands (L1-L4) against the Main Protease (6LU7) of novel coronavisrus (COVID-19). The result of the docking of L1-L4 showed a significant inhibitory action against the Main protease (M
Keywords	covid19
Language	English
Publishing date	2020-08-31
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	194476-9
ISSN	0022-2860 ; 0377-046X
ISSN	0022-2860 ; 0377-046X
DOI	10.1016/j.molstruc.2020.129178
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Exploring the Inclusion Complex of an Anticancer Drug with β-Cyclodextrin for Reducing Cytotoxicity Toward the Normal Human Cell Line by an Experimental and Computational Approach.

Sharma, Antara / Bomzan, Pranish / Roy, Niloy / Dakua, Vikas Kumar / Roy, Kanak / Barman, Abhinath / Dey, Rabindra / Chhetri, Abhijit / Dewan, Rajani / Dutta, Ankita / Kumar, Anoop / Roy, Mahendra Nath

ACS omega

2023 Volume 8, Issue 32, Page(s) 29388–29400

Abstract: The toxicity of any drug against normal cells is a health hazard for all humans. At present, health and disease researchers from all over the world are trying to synthesize designer drugs with diminished toxicity and side effects. The purpose of the ... ...

Abstract	The toxicity of any drug against normal cells is a health hazard for all humans. At present, health and disease researchers from all over the world are trying to synthesize designer drugs with diminished toxicity and side effects. The purpose of the present study is to enhance the bioavailability and biocompatibility of gemcitabine (GEM) by decreasing its toxicity and reducing deamination during drug delivery by incorporating it inside the hydrophobic cavity of β-cyclodextrin (β-CD) without affecting the drug ability of the parent compound (GEM). The newly synthesized inclusion complex (IC) was characterized by different physical and spectroscopic techniques, thereby confirming the successful incorporation of the GEM molecule into the nanocage of β-CD. The molecular docking study revealed the orientation of the GEM molecule into the β-CD cavity (-5.40 kcal/mol) to be stably posed for ligand binding. Photostability studies confirmed that the inclusion of GEM using β-CD could lead to better stabilization of GEM (≥96%) for further optical and clinical applications. IC (GEM-β-CD) and GEM exhibited effective antibacterial and antiproliferative activities without being metabolized in a dose-dependent manner. The CT-DNA analysis showed sufficiently strong IC (GEM-β-CD) binding (
Language	English
Publishing date	2023-08-03
Publishing country	United States
Document type	Journal Article
ISSN	2470-1343
ISSN (online)	2470-1343
DOI	10.1021/acsomega.3c02783
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Synthesis, characterization and computational study on potential inhibitory action of novel azo imidazole derivatives against COVID-19 main protease (M

Chhetri, Abhijit / Chettri, Sailesh / Rai, Pranesh / Mishra, Dipu Kumar / Sinha, Biswajit / Brahman, Dhiraj

Journal of molecular structure

2020 Volume 1225, Page(s) 129230

Abstract: A series of six novel imidazole anchored azo-imidazole derivatives (L1-L6) have been prepared by the simple condensation reaction of azo-coupled ortho-vaniline precursor with amino functionalised imidazole derivative and the synthesized derivatives (L1- ... ...

Abstract	A series of six novel imidazole anchored azo-imidazole derivatives (L1-L6) have been prepared by the simple condensation reaction of azo-coupled ortho-vaniline precursor with amino functionalised imidazole derivative and the synthesized derivatives (L1-L6) have been characterized by different analytical and spectroscopic techniques. Molecular docking studies were carried out to ascertain the inhibitory action of studied ligands (L1-L6) against the Main Protease (6LU7) of novel coronavirus (COVID-19). The result of the docking of L1-L6 showed a significant inhibitory action against the Main protease (M
Keywords	covid19
Language	English
Publishing date	2020-09-18
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	194476-9
ISSN	0022-2860 ; 0377-046X
ISSN	0022-2860 ; 0377-046X
DOI	10.1016/j.molstruc.2020.129230
Database	MEDical Literature Analysis and Retrieval System OnLINE

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ab Jg. 2022: Lesesaal (EG)

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Article ; Online: Isaria tenuipes Peck, an entomopathogenic fungus from Darjeeling Himalaya: Evaluation of in-vitro antiproliferative and antioxidant potential of its mycelium extract.

Chhetri, Dhani Raj / Chhetri, Abhijit / Shahi, Nerina / Tiwari, Snigdha / Karna, Shibendra Kumar Lal / Lama, Dorjay / Pokharel, Yuba Raj

BMC complementary medicine and therapies

2020 Volume 20, Issue 1, Page(s) 185

Abstract: Background: Isaria tenuipes is one of the potent species in the members of the genus Isaria, which is well reported to possess multiple bioactive substances of therapeutic importance. Therefore, an in vitro experimental study was carried to evaluate the ...

Abstract	Background: Isaria tenuipes is one of the potent species in the members of the genus Isaria, which is well reported to possess multiple bioactive substances of therapeutic importance. Therefore, an in vitro experimental study was carried to evaluate the bioactivities of the crude methanolic extract from the mycelium of this fungus. Methods: The fungus was authenticated through morphological characters and the species discrepancy was resolved using the nuclear rDNA ITS sequence. The methanolic extract was fingerprinted by FTIR. The antioxidant components in terms of total phenols and flavonoids were determined as gallic acid and quercetin equivalents respectively. Antioxidant activities of the methanolic extract was assessed using 1, 1-diphenyl-2-picrylhydrazyl (DPPH), 2, 2 Results: In the present study total phenol content of the dried methanol extract was 148.09 ± 3.51μg gallic acid equivalent/mg and flavonoid was 9.02±0.95 μg quercetin/mg. The antioxidant activities of methanol-water extract (8:2 v/v) from cultured mycelia of I. tenuipes investigated and evaluated with 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay revealed IC Conclusion: In this study, it can be concluded that the crude methanolic extract exhibited potent antioxidant and antiproliferative activities suggesting natural antioxidative and antiproliferative agents.
MeSH term(s)	Antineoplastic Agents/chemistry ; Antineoplastic Agents/pharmacology ; Antioxidants/chemistry ; Antioxidants/pharmacology ; HeLa Cells ; Hep G2 Cells ; Humans ; Hypocreales/chemistry ; India ; Mycelium/chemistry ; PC-3 Cells
Chemical Substances	Antineoplastic Agents ; Antioxidants
Language	English
Publishing date	2020-06-11
Publishing country	England
Document type	Journal Article
ISSN	2662-7671
ISSN (online)	2662-7671
DOI	10.1186/s12906-020-02973-w
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Isaria tenuipes Peck, an entomopathogenic fungus from Darjeeling Himalaya: Evaluation of in-vitro antiproliferative and antioxidant potential of its mycelium extract

Chhetri, Dhani Raj / Chhetri, Abhijit / Shahi, Nerina / Tiwari, Snigdha / Karna, Shibendra Kumar Lal / Lama, Dorjay / Pokharel, Yuba Raj

BMC Complement Med Ther. 2020 Dec., v. 20, no. 1 p.185-185

2020

Abstract: BACKGROUND: Isaria tenuipes is one of the potent species in the members of the genus Isaria, which is well reported to possess multiple bioactive substances of therapeutic importance. Therefore, an in vitro experimental study was carried to evaluate the ... ...

Abstract	BACKGROUND: Isaria tenuipes is one of the potent species in the members of the genus Isaria, which is well reported to possess multiple bioactive substances of therapeutic importance. Therefore, an in vitro experimental study was carried to evaluate the bioactivities of the crude methanolic extract from the mycelium of this fungus. METHODS: The fungus was authenticated through morphological characters and the species discrepancy was resolved using the nuclear rDNA ITS sequence. The methanolic extract was fingerprinted by FTIR. The antioxidant components in terms of total phenols and flavonoids were determined as gallic acid and quercetin equivalents respectively. Antioxidant activities of the methanolic extract was assessed using 1, 1-diphenyl-2-picrylhydrazyl (DPPH), 2, 2/-azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) radical cation (ABTS⁰⁺), Fe²⁺chelating activity, and hydroxyl radical scavenging assays. Cytotoxicity of the extract was determined by [3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide] (MTT) assay on three cancer cell lines: HeLa, HepG2, and PC3. Apoptosis was further studied by propidium iodide (PI) and Annexin-V/PI staining flow cytometric analysis. Anti-proliferation capacity was studied by colony-forming assay. RESULTS: In the present study total phenol content of the dried methanol extract was 148.09 ± 3.51μg gallic acid equivalent/mg and flavonoid was 9.02±0.95 μg quercetin/mg. The antioxidant activities of methanol-water extract (8:2 v/v) from cultured mycelia of I. tenuipes investigated and evaluated with 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay revealed IC₅₀ value of 5.04mg/ml with an inhibition rate of 74.77% at 10mg/ml and with an iron-chelating assay the chelating ability was recorded to be 86.76% where the IC₅₀ value was 4.43 mg/ml. In comparison among the antioxidant assays, 2,2/-azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) radical cation (ABTS⁰⁺) and hydroxyl assay exhibited radical scavenging rate of 44.42% and 49.82% respectively at a concentration of 10 mg/ml. The IC₅₀ value of the extract in MTT assay was 43.45μg/ml with HeLa cells, 119.33μg/ml with PC3 cells, and 125.55μg/ml with HepG2 cells. CONCLUSION: In this study, it can be concluded that the crude methanolic extract exhibited potent antioxidant and antiproliferative activities suggesting natural antioxidative and antiproliferative agents.
Keywords	Isaria ; antioxidant activity ; apoptosis ; cations ; complement ; cytotoxicity ; entomopathogenic fungi ; flow cytometry ; gallic acid ; hydroxyl radicals ; methanol ; mycelium ; neoplasm cells ; phenols ; propidium ; quercetin ; therapeutics ; toxicity testing ; Himalayan region
Language	English
Dates of publication	2020-12
Size	p. 185.
Publishing place	BioMed Central
Document type	Article ; Online
ISSN	2662-7671
DOI	10.1186/s12906-020-02973-w
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Complete chloroplast genome of the hot desert herb

Ali, Mohammad Ajmal / Elshikh, Mohammad S / Kim, Soo-Yong / Al-Hemaid, Fahad / Lee, Joongku / Lama, Dorjay / Chhetri, Abhijit / Pan, Tapan Kumar

Mitochondrial DNA. Part B, Resources

2019 Volume 4, Issue 2, Page(s) 3904–3905

Abstract: The complete chloroplast genome sequences of the hot desert ... ...

Abstract	The complete chloroplast genome sequences of the hot desert herb
Language	English
Publishing date	2019-11-08
Publishing country	England
Document type	Journal Article
ISSN	2380-2359
ISSN (online)	2380-2359
DOI	10.1080/23802359.2019.1687358
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Exploration of Inhibitory Action of Azo imidazole Derivatives against COVID-19 Main Protease (Mpro): A Computational Study

Chhetri, Abhijit / Chettri, Sailesh / Rai, Pranesh / Sinha, Biswajit / Brahman, Dhiraj

Journal of Molecular Structure

Abstract	Four novel ionic liquid tagged azo-azomethine derivatives (L1-L4) have been prepared by the condensation reaction of azo-coupled ortho-vaniline precursor with amino functionalised imidazole derivative and the synthesized derivatives (L1-L4) have been characterized by different analytical and spectroscopic techniques Molecular docking studies were carried out to ascertain the inhibitory action of studied ligands (L1-L4) against the Main Protease (6LU7) of novel coronavisrus (COVID-19) The result of the docking of L1-L4 showed a significant inhibitory action against the Main protease (Mpro) of SARS-CoV-2 and the binding energy (ΔG) values of the ligands (L1-L4) against the protein 6LU7 have found to be −7 7 Kcal/mole (L1), −7 0 Kcal/mole (L2), −7 9 Kcal/mole (L3), and −7 9 Kcal/mole (L4) The efficiency of the ligands has been compared with the FDA approved and clinically trial drugs such as remdesivir, Chloroquin and Hydroxychloroquin and native ligand ligand N3 of main protease 6LU7 to ascertain the inhibitory potential of the studied ligands (L1-L4) against the protein 6LU7 Pharmacokinetic properties (ADME) of the ligands (L1-L4) have also been studied
Keywords	covid19
Publisher	WHO
Document type	Article
Note	WHO #Covidence: #735338
Database	COVID19

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Article ; Online: Isaria tenuipes Peck, an entomopathogenic fungus from Darjeeling Himalaya

Dhani Raj Chhetri / Abhijit Chhetri / Nerina Shahi / Snigdha Tiwari / Shibendra Kumar Lal Karna / Dorjay Lama / Yuba Raj Pokharel

BMC Complementary Medicine and Therapies, Vol 20, Iss 1, Pp 1-

Evaluation of in-vitro antiproliferative and antioxidant potential of its mycelium extract

2020 Volume 14

Abstract: Abstract Background Isaria tenuipes is one of the potent species in the members of the genus Isaria, which is well reported to possess multiple bioactive substances of therapeutic importance. Therefore, an in vitro experimental study was carried to ... ...

Abstract	Abstract Background Isaria tenuipes is one of the potent species in the members of the genus Isaria, which is well reported to possess multiple bioactive substances of therapeutic importance. Therefore, an in vitro experimental study was carried to evaluate the bioactivities of the crude methanolic extract from the mycelium of this fungus. Methods The fungus was authenticated through morphological characters and the species discrepancy was resolved using the nuclear rDNA ITS sequence. The methanolic extract was fingerprinted by FTIR. The antioxidant components in terms of total phenols and flavonoids were determined as gallic acid and quercetin equivalents respectively. Antioxidant activities of the methanolic extract was assessed using 1, 1-diphenyl-2-picrylhydrazyl (DPPH), 2, 2/-azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) radical cation (ABTS0+), Fe2+chelating activity, and hydroxyl radical scavenging assays. Cytotoxicity of the extract was determined by [3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide] (MTT) assay on three cancer cell lines: HeLa, HepG2, and PC3. Apoptosis was further studied by propidium iodide (PI) and Annexin-V/PI staining flow cytometric analysis. Anti-proliferation capacity was studied by colony-forming assay. Results In the present study total phenol content of the dried methanol extract was 148.09 ± 3.51μg gallic acid equivalent/mg and flavonoid was 9.02±0.95 μg quercetin/mg. The antioxidant activities of methanol-water extract (8:2 v/v) from cultured mycelia of I. tenuipes investigated and evaluated with 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay revealed IC50 value of 5.04mg/ml with an inhibition rate of 74.77% at 10mg/ml and with an iron-chelating assay the chelating ability was recorded to be 86.76% where the IC50 value was 4.43 mg/ml. In comparison among the antioxidant assays, 2,2/-azinobis-(3-ethylbenzthiazoline-6-sulphonic acid) radical cation (ABTS0+) and hydroxyl assay exhibited radical scavenging rate of 44.42% and 49.82% respectively ...
Keywords	Antioxidant ; antiproliferative activities ; Cytotoxicity ; FTIR ; Isaria tenuipes ; Other systems of medicine ; RZ201-999
Subject code	500
Language	English
Publishing date	2020-06-01T00:00:00Z
Publisher	BMC
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Synthesis, Characterization and Computational Study on Potential Inhibitory Action of Novel Azo Imidazole Derivatives against COVID-19 Main Protease (Mpro: 6LU7)

Chhetri, Abhijit / Chettri, Sailesh / Rai, Pranesh / Mishra, Dipu Kumar / Sinha, Biswajit / Brahman, Dhiraj

J Mol Struct

Abstract	A series of six novel imidazole anchored azo-imidazole derivatives (L1-L6) have been prepared by the simple condensation reaction of azo-coupled ortho-vaniline precursor with amino functionalised imidazole derivative and the synthesized derivatives (L1-L6) have been characterized by different analytical and spectroscopic techniques. Molecular docking studies were carried out to ascertain the inhibitory action of studied ligands (L1-L6) against the Main Protease (6LU7) of novel coronavirus (COVID-19). The result of the docking of L1-L6 showed a significant inhibitory action against the Main protease (Mpro) of SARS-CoV-2 and the binding energy (ΔG) values of the ligands (L1-L6) against the protein 6LU7 have found to be -7.7 Kcal/mole (L1), -7.4 Kcal/mole (L2), -6.7 Kcal/mole (L3), -7.9 Kcal/mole (L4), -8.1 Kcal/mole (L5) and -7.9 Kcal/mole (L6). Pharmacokinetic properties (ADME) of the ligands (L1-L6) have also been studied.
Keywords	covid19
Publisher	WHO
Document type	Article
Note	WHO #Covidence: #779466
Database	COVID19

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Article: Structural elucidation and chemical characterization of underutilized fruit silverberry (Elaeagnus pyriformis) silver nanoparticles playing a dual role as anti-cancer agent by promoting apoptosis and inhibiting ABC transporters

Banerjee, Swarnendra / Kar, Pallab / Sarkar, Indrani / Chhetri, Abhijit / Mishra, Dipu Kumar / Dutta, Ankita / Kumar, Anoop / Sinha, Biswajit / Sen, Arnab

SAAB South African journal of botany. 2021 June 20,

2021

Abstract: Nanotechnology is a multidisciplinary science in the fields of Physics, Chemistry and Biology. Nanoparticles have a large surface area to volume ratio and high surface energy. Due to this characteristic feature; it opens up new scope for its various ... ...

Abstract	Nanotechnology is a multidisciplinary science in the fields of Physics, Chemistry and Biology. Nanoparticles have a large surface area to volume ratio and high surface energy. Due to this characteristic feature; it opens up new scope for its various applications. In this study, we have reported the synthesis of silver nanoparticles (AgNP) from silver nitrate (AgNO₃) using the underutilized fruit of Elaeagnus pyriformis fruit juice in an optimized reaction. During synthesis, solution color changes from yellow to brownish due to reduction of Ag⁺ into Ag⁰ (AgNP) by phytocompounds (fatty acid and its derivatives) of E. pyriformis fruit juice. To know the presence and involvement of bioactive compounds as a reducing and capping agent the AgNPs were extensively characterized by UV-Vis spectroscopy, SEM (Scanning electron microscopy), FESEM (Field emission scanning electron microscopy), EDX (Energy-dispersive X-ray), XRD (X-ray diffraction analysis)and FTIR (Fourier transformed infrared spectroscopy). Furthermore, the antioxidant efficacy of AgNP was determined and significant antimicrobial activity was recorded against human pathogenic micro organisms. To know the efficacy as a potent anticancerous agent, in-silico molecular docking analysis was done using anti-apoptotic protein Bcl-XL and preliminary results indicate that AgNPs may have the potency to combat cancer by manipulating apoptosis.
Keywords	Elaeagnus ; X-radiation ; X-ray diffraction ; antimicrobial properties ; antineoplastic agents ; antioxidant activity ; apoptosis ; color ; computer simulation ; energy ; fatty acids ; fruit juices ; fruits ; nanosilver ; pathogens ; pro-apoptotic proteins ; silver nitrate ; surface area ; ultraviolet-visible spectroscopy
Language	English
Dates of publication	2021-0620
Publishing place	Elsevier B.V.
Document type	Article
Note	Pre-press version
ZDB-ID	2126918-X
ISSN	0254-6299
ISSN	0254-6299
DOI	10.1016/j.sajb.2021.06.029
Database	NAL-Catalogue (AGRICOLA)

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