Browsing by Author "Mandal, Amit Kumar"

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Bio-molecule functionalized rapid one-pot green synthesis of silver nanoparticles and their efficacy toward the multidrug resistant (MDR) gut bacteria of silkworms (Bombyx mori)
(ROYAL SOC CHEMISTRY, 2020-01-01) Some, Sudip; Sarkar, Biraj; Biswas, Kinkar; Jana, Tushar Kanti; Bhattacharjya, Debjoy; Dam, Paulami; Mondal, Rittick; Kumar, Anoop; Deb, Apurba Kanti; Sadat, Abdul; Saha, Soumen; Kati, Ahmet; Ocsoy, Ismail; Franco, Octavio L.; Mandal, Amitava; Mandal, Sukhendu; Mandal, Amit Kumar; Ince, Ikbal Agah
The present study aimed to synthesise bio-molecule functionalized silver nanoparticles (AgNPs) using leaf extract from mulberry variety S-1635 (Morus albaL.) and to explore its antibacterial efficacy against multidrug resistant (MDR) gut bacteria isolated from natural infection observed from silkworm larvae in rearing conditions. AgNPs formation was established by surface plasmon resonance at 480 nm. The crystallinity of the synthesised AgNPs was checked by HR-TEM and XRD analysis. SEM and TEM characterisation further exhibited the spherical, monodispersed, well scattered nature of the AgNPs with an average particle size of 11.8 nm +/- 2.8. The presence of (111), (200), (220) and (311) planes in Bragg's reflections confirmed the face-cantered-cubic crystalline silver. EDX analysis confirmed the presence of elemental silver. FT-IR spectra revealed functional groups were responsible for the reduction of silver ions. The zeta potential value of -17.3 mV and -25.6 mV was recorded in MH and DMEM/F-12 media, respectively. The LC-QTOF/MS and HRMS spectra disclosed the presence of bioactive compounds like flavonoid, gallic acid, and stigmasterol, which are probably involved in the reduction and functionalization of AgNPs. The antibacterial efficacy of bio-molecule functionalized AgNPs and the naked AgNPs was tested on Gram-positive and Gram-negative bacteria isolated from silkworms and characterized by using 16S rDNA andgyrBgenes. The cytotoxicity of AgNPs was tested on WRL-68, HEK-293, ACHN, and HUH-7 cell lines using MTT assay. This study provides an insight into the application of bio-molecule functionalized AgNPs for combating various silkworm pathogens which severely affect the agro-rural economy of developing countries.
Effect of feed supplementation with biosynthesized silver nanoparticles using leaf extract of Morus indica L. V1 on Bombyx mori L. (Lepidoptera: Bombycidae)
(NATURE PORTFOLIO, 2019-01-01) Some, Sudip; Bulut, Onur; Biswas, Kinkar; Kumar, Anoop; Roy, Anupam; Sen, Ipsita Kumar; Mandal, Amitava; Franco, Octavio L.; Ince, Ikbal Agah; Neog, Kartik; Das, Sandip; Pradhan, Sayantan; Dutta, Subhadeep; Bhattacharjya, Debjoy; Saha, Soumen; Das Mohapatra, Pradeep K.; Bhuimali, Anil; Unni, B. G.; Kati, Ahmet; Mandal, Amit Kumar; Yilmaz, M. Deniz; Ocsoy, Ismail
Herein, we report the synthesis of silver nanoparticles (AgNPs) by a green route using the aqueous leaf extract of Morus indica L. V1. The synthesized AgNPs exhibited maximum UV-Vis absorbance at 460 nm due to surface plasmon resonance. The average diameter (similar to 54 nm) of AgNPs was measured from HR-TEM analysis. EDX spectra also supported the formation of AgNPs, and negative zeta potential value (-14 mV) suggested its stability. Moreover, a shift in the carbonyl stretching (from 1639 cm(-1) to 1630 cm(-1)) was noted in the FT-IR spectra of leaf extract after AgNPs synthesis which confirm the role of natural products present in leaves for the conversion of silver ions to AgNPs. The four bright circular rings (111), (200), (220) and (311) observed in the selected area electron diffraction pattern are the characteristic reflections of face centered cubic crystalline silver. LC-MS/MS study revealed the presence of phytochemicals in the leaf extract which is responsible for the reduction of silver ions. MTT assay was performed to investigate the cytotoxicity of AgNPs against two human cell lines, namely HepG2 and WRL-68. The antibacterial study revealed that MIC value of the synthesized AgNPs was 80 mu g/ml against Escherichia coli K12 and Staphylococcus aureus (MTCC 96). Finally, the synthesized AgNPs at 10 mu g/ml dosages showed beneficial effects on the survivability, body weights of the Bombyx mori L. larvae, pupae, cocoons and shells weights via enhancing the feed efficacy.
Genomic Clues of a Multidrug-Resistant Bacterium from Cultured Domestic Silkworm (Bombyx mori L.)
(AMER SOC MICROBIOLOGY, 2022-01-01) Mandal, Amit Kumar; Sarkar, Biraj; Mandal, Hrisikesh; Chakraborty, Arka Pratim; Das Mohapatra, Pradeep Kumar; Dam, Paulami; Mondal, Rittick; Some, Sudip; Sadat, Abdul; Ghati, Amit; Neog, Kartik; Mandal, Sukhendu; Ince, Ikbal Agah
Enterobacter sp. strain ASE was isolated from the gut of an infected domestic silkworm (Bombyx mori L
Study of epidemiological behaviour of malaria and its control in the Purulia district of West Bengal, India (2016-2020)
(NATURE PORTFOLIO, 2022-01-01) Pradhan, Sayantan; Hore, Samrat; Maji, Suman Kumar; Manna, Simi; Maity, Abhijit; Kundu, Pratip Kumar; Maity, Krishna; Roy, Stabak; Mitra, Saptarshi; Dam, Paulami; Mondal, Rittick; Ghorai, Suvankar; Jawed, Junaid Jibran; Dutta, Subhadeep; Das, Sandip; Mandal, Sukhendu; Mandal, Sanjib; Kati, Ahmet; Sinha, Sangram; Maity, Amit Bikram; Dolai, Tuphan Kanti; Mandal, Amit Kumar; Ince, Ikbal Agah
Purulia is a malaria-prone district in West Bengal, India, with approximately half of the blocks defined as malaria endemic. We analyzed the malaria case in each block of the Purulia district from January 1, 2016, to December 31, 2020. As per the API, 20 blocks of Purulia were assigned to four different categories (0-3) and mapped using ArcGIS software. An exponential decay model was fitted to forecast the trend of malaria cases for each block of Purulia (2021-2025). There was a sharp decrease in total malaria cases and API from 2016 to 2020 due to the mass distribution of LLINs. The majority of cases (72.63\%) were found in >= 15-year age group. Males were more prone to malaria (60.09\%). Malaria was highly prevalent among Scheduled Tribes (48.44\%). Six blocks were reported in Category 3 (high risk) and none in Category 0 (no risk) in 2016, while no blocks were determined to be in Category 3, and three blocks were in Category 0 in 2020. The exponential decay model prediction is oriented towards gaining malaria-free status in thirteen blocks of Purulia by 2025. This study will incite the government to uphold and strengthen the current efforts to meet the malaria elimination goals.