Nandita Chowdhury - Academia.edu (original) (raw)

Papers by Nandita Chowdhury

Research paper thumbnail of Fatty Acid Analysis of Leaf and Berry of Solanum villosum Mill. and its Prospect as Diet and Bactericide

Analytical Chemistry Letters, 2015

Research paper thumbnail of Synthetic Inorganic Ion-Exchangers. Part XII. Hydrous Cerium(IV) Oxide: Anion-Exchange Properties and Some Ion-Exchange Separations

Separ Sci Technol, 1979

The anion-exchange behavior of hydrated cerium(IV) oxide has been studied. The distribution coeff... more The anion-exchange behavior of hydrated cerium(IV) oxide has been studied. The distribution coefficients of several anions on cerium dioxide were determined. On the basis of the distribution coefficients some selective ion-exchange separations of anions are reported.

Research paper thumbnail of Mosquito larvicidal activity of Solanum nigrum berry extracts

The Indian Journal of Medical Research

Phytochemicals are widely used as biocontrol agent against vector mosquitoes. The present study w... more Phytochemicals are widely used as biocontrol agent against vector mosquitoes. The present study was undertaken to isolate and evaluate the mosquitocidal activity of various extracts of berries of S. nigrum against Culex quinquefasciatus. Crude and chloroform: methanol (1:1, v/v) extracts of fresh, mature, green berries of S. nigrum were tested against Cx. quinquefasciatus. The lethal concentration was determined and the chemical nature of the active substance was evaluated. A qualitative phytochemical analysis of chloroform: methanol (1:1, v/v) extract was performed in search of the active ingredient. The appropriate lethal concentrations at 24 h for chloroform: methanol (1:1, v/v) extract was also studied on non-target organisms. In a 72 h bioassay experiment with crude extract, the highest mortality was recorded in 3 per cent extract. In the chloroform: methanol (1:1, v/v) solvent extract, the maximum mortality was recorded at a concentration of 120 μg/ml. The log probit analysis ...

Research paper thumbnail of n-Alkane Profile of Argemone mexicana Leaves

An n-hexane extract of fresh, mature leaves of Argemone mexicana (Papaveraceae), containing thin-... more An n-hexane extract of fresh, mature leaves of Argemone mexicana (Papaveraceae), containing thin-layer epicuticular waxes, has been analysed for the first time by TLC, IR and GLC using standard hydrocarbons. Seventeen long-chain alkanes (n-C18 to n-C34) were identified and quantified. Nonacosane (n-C29) was established as the n-alkane with the highest amount, whilst octadecane (n-C19) was the least abundant component of the extracted wax fraction. The carbon preference index (CPI) calculated for the hydrocarbon sample with the chain lengths between C18 and C34 was 1.2469, showing an odd to even carbon number predominance.

Research paper thumbnail of Laboratory evaluation of a phytosteroid compound of mature leaves of Day Jasmine (Solanaceae: Solanales) against larvae of Culex quinquefasciatus (Diptera: Culicidae) and nontarget organisms

Parasitology Research, 2008

Crude mature leaves extract of Day Jasmine, Cestrum diurnum (Solanaceae: Solanales), was investig... more Crude mature leaves extract of Day Jasmine, Cestrum diurnum (Solanaceae: Solanales), was investigated for larvicidal activities against Culex quinquefasciatus, the vector of human filariasis. All the graded concentrations (0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, and 3% v/v) showed significant (P<0.05) larval mortality, and results of regression equations revealed that the mortality rates were positively correlated with the concentrations of the extract (R 2 close to 1). LC 50 , LC 95 , and LC 99 values were calculated at different time intervals, and the lowest value was recorded at the 72-h bioassay for third-instar larvae. Significant changes in the larval mortality (F<0.05) was also recorded between the periods of exposure and between instars during t test and single analysis of variance analysis. No mortality was noticed for nontarget organisms, such as Oreochromis niloticus niloticus and Chironomid larvae within 72 h of postexposure to 1%, 2%, and 3% crude plant extract under the laboratory condition. Qualitative and chromatographic analysis of the crude extract of C. diurnum revealed the presence of many bioactive phytochemicals. The bioassay experiment with the third-instar larval form established that the presence of a steroid compound (R f , 0.67) was responsible for mosquitocidal activity.

Research paper thumbnail of Determination of the n -alkane profile of epicuticular wax extracted from mature leaves of Cestrum nocturnum (Solanaceae: Solanales)

Natural Product Research, 2010

An n-hexane extract of fresh, mature leaves of Cestrum nocturnum (Solanales: Solanaceae) containi... more An n-hexane extract of fresh, mature leaves of Cestrum nocturnum (Solanales: Solanaceae) containing thin layer epicuticular waxes was analysed by thin-layer chromatography, infrared and gas liquid chromatography using standard hydrocarbons. Seventeen long chain alkanes (n-C(18) to n-C(34)) were identified and quantified. Hentriacontane (n-C(31)) was established as the major n-alkane, while nonadecane (n-C(19)) was the least abundant component of the extracted wax fraction. The carbon preference index calculated for the sample was 1.30, showing an odd to even carbon number predominance.

Research paper thumbnail of Larvicidal activity of Solanum villosum Mill (Solanaceae: Solanales) leaves to Anopheles subpictus Grassi (Diptera: Culicidae) with effect on non-target Chironomus circumdatus Kieffer (Diptera: Chironomidae)

Journal of Pest Science, 2009

... (Diptera: Culicidae) with eVect on non-target Chironomus circumdatus KieVer (Diptera: Chirono... more ... (Diptera: Culicidae) with eVect on non-target Chironomus circumdatus KieVer (Diptera: Chironomidae) Nandita Chowdhury · Soroj Kumar Chatterjee · Subrata Laskar · Goutam Chandra ... 2001; Ghosh and Chandra 2006; Mohan et al. 2006 Ghosh et al. 2008). ...

Research paper thumbnail of Mosquito larvicidal activities of Solanum villosum berry extract against the dengue vector Stegomyia aegypti

BMC Complementary and Alternative Medicine, 2008

Background: Vector control is facing a threat due to the emergence of resistance to synthetic ins... more Background: Vector control is facing a threat due to the emergence of resistance to synthetic insecticides. Insecticides of botanical origin may serve as suitable alternative biocontrol techniques in the future. Although several plants have been reported for mosquitocidal activity, only a few botanicals have moved from the laboratory to field use, because they are poorly characterized, in most cases active principals are not determined and most of the works are restricted to preliminary screening. Solanum villosum is a common weed distributed in many parts of India with medicinal properties, but the larvicidal activity of this plant has not been reported so far.

Research paper thumbnail of Efficacy of Solanum villosum Mill. (Solanaceae: Solanales ) as a Biocontrol Agent against Fourth Instar Larvae of Culex quinquefasciatus Say

Turkish Journal of Zoology

Culex quinquefasciatus Say is generally known as the vector of the pathogen responsible for bancr... more Culex quinquefasciatus Say is generally known as the vector of the pathogen responsible for bancroftian filariasis in warm and humid areas. Phytochemicals have a major role in mosquito control programs (Hag et al., 1999; Palsson and Janeson, 1999; Markouk et al., 2000; ...

Research paper thumbnail of Mosquito larvicidal and antimicrobial activity of synthesized nano-crystalline silver particles using leaves and green berry extract of Solanum nigrum L. (Solanaceae: Solanales)

Acta Tropica, 2013

Silver nanoparticles (AgNPs) that are synthesized by using aqueous extracts of Solanum nigrum L.,... more Silver nanoparticles (AgNPs) that are synthesized by using aqueous extracts of Solanum nigrum L., is a simple, non-toxic and ecofriendly green material. The present study is based on assessments of the larvicidal and antimicrobial activities of the synthesized AgNPs from fresh leaves, dry leaves and green berries of S. nigrum against larvae of Culex quinquefasciatus and Anopheles stephensi and four human pathogenic and five fish pathogenic bacteria respectively. The synthesized nanoparticles are characterized with UV-vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscope (TEM) analysis. The nanoparticles are spherical to polyhedral in shape with size of 50-100 nm (average size of 56.6 nm). In larvicidal bioassay with synthesized AgNPs, highest mortality are observed at 10 ppm against An. stephensi with LC 50 values of 1.33, 1.59, 1.56 ppm and LC 90 values of 3.97, 7.31, 4.76 ppm for dry leaves, fresh leaves and berries respectively. Antibacterial activity test reveals better results against fish pathogenic bacteria than human pathogenic bacteria. Non target organism like Toxorhynchites larvae (mosquito predator), Diplonychus annulatum (predatory water-bug) and Chironomus circumdatus larvae (chironomid) are also exposed to respective lethal concentrations (to mosquito larvae) of dry nanoparticles and no abnormality in the non target organisms are recorded. These results suggest that the synthesized AgNPs of S. nigrum have the potential to be used as an ideal eco-friendly compound for the control of the mosquito larvae and harmful bacteria.

Research paper thumbnail of Plant extracts as potential mosquito larvicides

The Indian Journal of Medical Research, May 1, 2012

Mosquitoes act as a vector for most of the life threatening diseases like malaria, yellow fever, ... more Mosquitoes act as a vector for most of the life threatening diseases like malaria, yellow fever, dengue fever, chikungunya ferver, filariasis, encephalitis, West Nile Virus infection, etc. Under the Integrated Mosquito Management (IMM), emphasis was given on the application of alternative strategies in mosquito control. The continuous application of synthetic insecticides causes development of resistance in vector species, biological magnification of toxic substances through the food chain and adverse effects on environmental quality and non target organisms including human health. Application of active toxic agents from plant extracts as an alternative mosquito control strategy was available from ancient times. These are nontoxic, easily available at affordable prices, biodegradable and show broad-spectrum target-specific activities against different species of vector mosquitoes. In this article, the current state of knowledge on phytochemical sources and mosquitocidal activity, their mechanism of action on target population, variation of their larvicidal activity according to mosquito species, instar specificity, polarity of solvents used during extraction, nature of active ingredient and promising advances made in biological control of mosquitoes by plant derived secondary metabolites have been reviewed.

Research paper thumbnail of Fatty Acid Analysis of Leaf and Berry of Solanum villosum Mill. and its Prospect as Diet and Bactericide

Analytical Chemistry Letters, 2015

Research paper thumbnail of Synthetic Inorganic Ion-Exchangers. Part XII. Hydrous Cerium(IV) Oxide: Anion-Exchange Properties and Some Ion-Exchange Separations

Separ Sci Technol, 1979

The anion-exchange behavior of hydrated cerium(IV) oxide has been studied. The distribution coeff... more The anion-exchange behavior of hydrated cerium(IV) oxide has been studied. The distribution coefficients of several anions on cerium dioxide were determined. On the basis of the distribution coefficients some selective ion-exchange separations of anions are reported.

Research paper thumbnail of Mosquito larvicidal activity of Solanum nigrum berry extracts

The Indian Journal of Medical Research

Phytochemicals are widely used as biocontrol agent against vector mosquitoes. The present study w... more Phytochemicals are widely used as biocontrol agent against vector mosquitoes. The present study was undertaken to isolate and evaluate the mosquitocidal activity of various extracts of berries of S. nigrum against Culex quinquefasciatus. Crude and chloroform: methanol (1:1, v/v) extracts of fresh, mature, green berries of S. nigrum were tested against Cx. quinquefasciatus. The lethal concentration was determined and the chemical nature of the active substance was evaluated. A qualitative phytochemical analysis of chloroform: methanol (1:1, v/v) extract was performed in search of the active ingredient. The appropriate lethal concentrations at 24 h for chloroform: methanol (1:1, v/v) extract was also studied on non-target organisms. In a 72 h bioassay experiment with crude extract, the highest mortality was recorded in 3 per cent extract. In the chloroform: methanol (1:1, v/v) solvent extract, the maximum mortality was recorded at a concentration of 120 μg/ml. The log probit analysis ...

Research paper thumbnail of n-Alkane Profile of Argemone mexicana Leaves

An n-hexane extract of fresh, mature leaves of Argemone mexicana (Papaveraceae), containing thin-... more An n-hexane extract of fresh, mature leaves of Argemone mexicana (Papaveraceae), containing thin-layer epicuticular waxes, has been analysed for the first time by TLC, IR and GLC using standard hydrocarbons. Seventeen long-chain alkanes (n-C18 to n-C34) were identified and quantified. Nonacosane (n-C29) was established as the n-alkane with the highest amount, whilst octadecane (n-C19) was the least abundant component of the extracted wax fraction. The carbon preference index (CPI) calculated for the hydrocarbon sample with the chain lengths between C18 and C34 was 1.2469, showing an odd to even carbon number predominance.

Research paper thumbnail of Laboratory evaluation of a phytosteroid compound of mature leaves of Day Jasmine (Solanaceae: Solanales) against larvae of Culex quinquefasciatus (Diptera: Culicidae) and nontarget organisms

Parasitology Research, 2008

Crude mature leaves extract of Day Jasmine, Cestrum diurnum (Solanaceae: Solanales), was investig... more Crude mature leaves extract of Day Jasmine, Cestrum diurnum (Solanaceae: Solanales), was investigated for larvicidal activities against Culex quinquefasciatus, the vector of human filariasis. All the graded concentrations (0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, and 3% v/v) showed significant (P<0.05) larval mortality, and results of regression equations revealed that the mortality rates were positively correlated with the concentrations of the extract (R 2 close to 1). LC 50 , LC 95 , and LC 99 values were calculated at different time intervals, and the lowest value was recorded at the 72-h bioassay for third-instar larvae. Significant changes in the larval mortality (F<0.05) was also recorded between the periods of exposure and between instars during t test and single analysis of variance analysis. No mortality was noticed for nontarget organisms, such as Oreochromis niloticus niloticus and Chironomid larvae within 72 h of postexposure to 1%, 2%, and 3% crude plant extract under the laboratory condition. Qualitative and chromatographic analysis of the crude extract of C. diurnum revealed the presence of many bioactive phytochemicals. The bioassay experiment with the third-instar larval form established that the presence of a steroid compound (R f , 0.67) was responsible for mosquitocidal activity.

Research paper thumbnail of Determination of the n -alkane profile of epicuticular wax extracted from mature leaves of Cestrum nocturnum (Solanaceae: Solanales)

Natural Product Research, 2010

An n-hexane extract of fresh, mature leaves of Cestrum nocturnum (Solanales: Solanaceae) containi... more An n-hexane extract of fresh, mature leaves of Cestrum nocturnum (Solanales: Solanaceae) containing thin layer epicuticular waxes was analysed by thin-layer chromatography, infrared and gas liquid chromatography using standard hydrocarbons. Seventeen long chain alkanes (n-C(18) to n-C(34)) were identified and quantified. Hentriacontane (n-C(31)) was established as the major n-alkane, while nonadecane (n-C(19)) was the least abundant component of the extracted wax fraction. The carbon preference index calculated for the sample was 1.30, showing an odd to even carbon number predominance.

Research paper thumbnail of Larvicidal activity of Solanum villosum Mill (Solanaceae: Solanales) leaves to Anopheles subpictus Grassi (Diptera: Culicidae) with effect on non-target Chironomus circumdatus Kieffer (Diptera: Chironomidae)

Journal of Pest Science, 2009

... (Diptera: Culicidae) with eVect on non-target Chironomus circumdatus KieVer (Diptera: Chirono... more ... (Diptera: Culicidae) with eVect on non-target Chironomus circumdatus KieVer (Diptera: Chironomidae) Nandita Chowdhury · Soroj Kumar Chatterjee · Subrata Laskar · Goutam Chandra ... 2001; Ghosh and Chandra 2006; Mohan et al. 2006 Ghosh et al. 2008). ...

Research paper thumbnail of Mosquito larvicidal activities of Solanum villosum berry extract against the dengue vector Stegomyia aegypti

BMC Complementary and Alternative Medicine, 2008

Background: Vector control is facing a threat due to the emergence of resistance to synthetic ins... more Background: Vector control is facing a threat due to the emergence of resistance to synthetic insecticides. Insecticides of botanical origin may serve as suitable alternative biocontrol techniques in the future. Although several plants have been reported for mosquitocidal activity, only a few botanicals have moved from the laboratory to field use, because they are poorly characterized, in most cases active principals are not determined and most of the works are restricted to preliminary screening. Solanum villosum is a common weed distributed in many parts of India with medicinal properties, but the larvicidal activity of this plant has not been reported so far.

Research paper thumbnail of Efficacy of Solanum villosum Mill. (Solanaceae: Solanales ) as a Biocontrol Agent against Fourth Instar Larvae of Culex quinquefasciatus Say

Turkish Journal of Zoology

Culex quinquefasciatus Say is generally known as the vector of the pathogen responsible for bancr... more Culex quinquefasciatus Say is generally known as the vector of the pathogen responsible for bancroftian filariasis in warm and humid areas. Phytochemicals have a major role in mosquito control programs (Hag et al., 1999; Palsson and Janeson, 1999; Markouk et al., 2000; ...

Research paper thumbnail of Mosquito larvicidal and antimicrobial activity of synthesized nano-crystalline silver particles using leaves and green berry extract of Solanum nigrum L. (Solanaceae: Solanales)

Acta Tropica, 2013

Silver nanoparticles (AgNPs) that are synthesized by using aqueous extracts of Solanum nigrum L.,... more Silver nanoparticles (AgNPs) that are synthesized by using aqueous extracts of Solanum nigrum L., is a simple, non-toxic and ecofriendly green material. The present study is based on assessments of the larvicidal and antimicrobial activities of the synthesized AgNPs from fresh leaves, dry leaves and green berries of S. nigrum against larvae of Culex quinquefasciatus and Anopheles stephensi and four human pathogenic and five fish pathogenic bacteria respectively. The synthesized nanoparticles are characterized with UV-vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscope (TEM) analysis. The nanoparticles are spherical to polyhedral in shape with size of 50-100 nm (average size of 56.6 nm). In larvicidal bioassay with synthesized AgNPs, highest mortality are observed at 10 ppm against An. stephensi with LC 50 values of 1.33, 1.59, 1.56 ppm and LC 90 values of 3.97, 7.31, 4.76 ppm for dry leaves, fresh leaves and berries respectively. Antibacterial activity test reveals better results against fish pathogenic bacteria than human pathogenic bacteria. Non target organism like Toxorhynchites larvae (mosquito predator), Diplonychus annulatum (predatory water-bug) and Chironomus circumdatus larvae (chironomid) are also exposed to respective lethal concentrations (to mosquito larvae) of dry nanoparticles and no abnormality in the non target organisms are recorded. These results suggest that the synthesized AgNPs of S. nigrum have the potential to be used as an ideal eco-friendly compound for the control of the mosquito larvae and harmful bacteria.

Research paper thumbnail of Plant extracts as potential mosquito larvicides

The Indian Journal of Medical Research, May 1, 2012

Mosquitoes act as a vector for most of the life threatening diseases like malaria, yellow fever, ... more Mosquitoes act as a vector for most of the life threatening diseases like malaria, yellow fever, dengue fever, chikungunya ferver, filariasis, encephalitis, West Nile Virus infection, etc. Under the Integrated Mosquito Management (IMM), emphasis was given on the application of alternative strategies in mosquito control. The continuous application of synthetic insecticides causes development of resistance in vector species, biological magnification of toxic substances through the food chain and adverse effects on environmental quality and non target organisms including human health. Application of active toxic agents from plant extracts as an alternative mosquito control strategy was available from ancient times. These are nontoxic, easily available at affordable prices, biodegradable and show broad-spectrum target-specific activities against different species of vector mosquitoes. In this article, the current state of knowledge on phytochemical sources and mosquitocidal activity, their mechanism of action on target population, variation of their larvicidal activity according to mosquito species, instar specificity, polarity of solvents used during extraction, nature of active ingredient and promising advances made in biological control of mosquitoes by plant derived secondary metabolites have been reviewed.