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Pesticidal Properties on the Leaf Extracts of Strychnos-Nux-Vomica Plant

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Pesticidal Properties on the Leaf Extracts of Strychnos-Nux-Vomica Plant Journal of Innovations in Pharmaceuticals and Biological Sciences JIPBS www.jipbs.com ISSN: 2349-2759 Research Article Pesticidal Properties on the Leaf Extracts of Strychnos-Nux-Vomica Plant Mity Thambi1, Tom Cherian*2 1Department of Chemistry, Catholicate College, Pathanamthitta, Kerala, India. 2Department of Chemistry, Christ College, Irinjalakuda, Kerala, India. Abstract Strychnos-nux-vomica which belongs to the family loganiacea is a medium-sized tree. Other names of Strychnos-nux-vomica are Kanjiram, Kuchla, Kupilu. In India, the quality/toxicity of traditional medical crude and processed Strychnos seeds can be controlled by examining the toxic alkaloids using established HPLC methods and/or HPLC-UV methods. Strychnos nux-vomica is also used in homeopathy. Strychnos has not been proven effective for the treatment of any illness. Since the seeds contain strychnine poison, conventional doctors do not recommend it as a medicine. In the present study reveals that, plant extracts of Strychnos-nux-vomica leaves in ethyl acetate solvent is highly toxic against adults of Sitophilus oryzae. Higher doses and exposure time are required to achieve 100% mortality for the adults of Sitophilus oryzae. The ethyl acetate extract of Strychnos-nux-vomica could be used as a potential grain protectant against Sitophilus oryzae. The use of botanical materials as insecticides will benefit our agricultural sector. They are not only of low cost, but have no environmental impact in term of insecticidal hazard. Therefore, the findings of the current experiments strongly support the use and exploration of botanicals in pest management practices. Key words: Strychnos-nux-vomica, Sitophilus oryzae, Disc method *Corresponding Author: Tom Cherian, Department of Chemistry, Christ College, Irinjalakuda, Kerala, India. 1. Introduction Strychnos-nux-vomica which belongs to with a smooth ashen bark [1]. The leaves the family loganiacea is a medium-sized have an opposite decussate arrangement, tree. Other names of Strychnos-nux-vomica short stalked, are oval shaped, also have a are Kanjiram, Kuchla, Kupilu. The wood is shiny coat and are smooth on both sides. dense, hard white, and close-grained. The The leaves are about 4 inches (10 cm) branches are irregular and are covered long and 3 inches (7.6 cm) wide. The ©JIPBS, All rights reserved Tom Cherian et al., JIPBS, Vol 2 (3), 266-272, 2015 flowers are small with a pale green colour Plant material with a funnel shape. They bloom in the Leaves of Strychnos-nux-vomica plant cold season and have a foul smell. The were collected from different areas of fruit are about the size of a large apple Thrissur district. The leaves of plant were with a smooth and hard shell which when collected in the middle of January 2015. ripened is a mild shade orange colour. Leaves was collected from the plant were In India, the quality/toxicity of traditional shade dried. After drying the plant medical crude and processed Strychnos materials were powdered. Powders of the seeds can be controlled by examining the leaves were used for extraction in toxic alkaloids using established HPLC different solvents. Fifty gram of powder methods and/or HPLC-UV methods. was used for extraction. Strychnos nux-vomica is also used in homeopathy. Strychnos has not been Method of extraction proven effective for the treatment of any Extraction: The leaves collected were illness. Since the seeds contain strychnine shade dried. Coarsely powdered 50g of poison, conventional doctors do not the plant material was extracted with 500 recommend it as a medicine. It is on the mL of petroleum ether, ethyl acetate and Commission E list of unapproved herbs, ethanol. The extraction was carried out in because it is not recommended for use a round bottom flask by boiling the and has not been proven to be safe or material in the solvents with a water effective. There is also no clinical trial condenser. Refluxed the material until the evidence of Strychnos supporting it being solvent started to boil and the hot content a viable cancer treatment. was left standing overnight. Then filtered Prevention of food losses during and collected the extract and added fresh postharvest storage is of paramount solvent to residue. The process is repeated economic importance [2]. The major pests three times to complete the extraction. of stored grain are the primary pest those The combined extract collected was which are capable of penetrating and reduced to 20 ml. infesting intact kernel of grain. High moisture weeds, seeds and grains were Crude extract dilution damaged by primary pests. The important From each crude extract 15mg, 30mg and primary pests are Sitophilus oryzae 50mg extracts were accurately weighed commonly called the rice weevil. It is the and serially dissolved in 1ml of acetone. most common and the most destructive Then it was made upto 100ml by using pest of stored grains [3]. distilled water. Thus from each extract The chemical compounds present in 150ppm, 300ppm, and 500ppm Strychnos nux-vomica plant are likely to be concentration of test solutions were biologically active even at lower prepared. Test solutions of three different concentrations. No work had been concentrations of each of the nine extracts reported on the extract of the leaves of were used for testing the Sitophilus oryzae Strychnos-nux-vomica collected from in three time periods(24hr,48hr,72hr) [4]. Thrissur district, Kerala. The present work reports the pesticidal activity of three Treatment- pesticidal activity different extracts from Strychnos nux- Lab studies have been carried out to vomica leaves against Sitophilus oryzae. ascertain pesticidal property of the plant extract (Strychnos-nux-vomica) against 2. Materials and Methods Sitophilus oryzae. 267 Tom Cherian et al., JIPBS, Vol 2 (3), 266-272, 2015 Disc method Graphs were based on time intervals The methodology used for contact assay (24hr, 48hr, and 72hr). Microsoft Excel with impregnated filter paper was package was used to prepare percentage proposed [5]. Sheets of filter paper mortality graphs against different (diameter 3cm) were impregnated with concentrations of plant extract. Each test solution (500ppm, 300ppm, 150ppm) graph compares the percentage of .One ml of each extract solution was mortality of three solvents (petroleum spread with the help of pipette over the ether, ethyl acetate, ethanol). filter paper and placed into petri dishes, while control sheets were impregnated by 3. Results and Discussion without any plant extract. The filter paper Pesticidal activity of the plant extract discs impregnated with extracts were air (Strychnos-nux-vomica) in three different dried until complete evaporation. Then solvents (Ethanol, Petroleum ether, Ethyl they were placed into and 25 adults of acetate) was tested against adults of Sitophilus oryzae were released in each Sitophilus oryzae, at different treatment and control dish, with three concentrations (150ppm, 300ppm, replicates per treatment and control plate. 500ppm). The experiment showed a The plates were wrapped in plastic film to relation of pest mortality level among 3 prevent escape of pest. Small holes were time intervals (24hr, 48hr, and 72hr). The made on the plastic film for aeration. results indicate variation in mortality Mortality counts were taken after 24hr, among the plant extracts tested against 48hr, 72hr intervals of treatment and the selected pest. The summary of results, expressed as percentages of mortality. in which the percentage of mortality of Dead insects were counted, death being adults of Sitophilus oryzae caused by ascertained by the complete absence of different plant extracts are represented in movement. Table1. The results indicate that mortality values Data analysis significantly increased depending on the The pests Sitophilus oryzae were collected. increasing plant extract concentration and Only adults were taken for bioassay. Plant with time of exposure. As considering leaf leaves were sorted and identified to extracts ethyl acetate medium Strychnos- species level. Plant extracts screened for nux-vomica is more effective than pesticidal activity was made. Data were petroleum ether and ethanol. Studies were grouped in Table1. Pest mortality was carried out with Strychnos-nux-vomica at measured in percentage and if the control the three concentrations in three different mortality was ranged between 5-20%, it time interval. More over at 500 ppm was corrected using Abbotts formula [6]. concentration it gives 100% mortality. Percentage of pest mortality can be The leaf extract of Strychnos-nux-vomica in calculated by using the formula three solvents (ethanol, petroleum ether, Number of dead pest ethyl acetate) at three time intervals Percentage mortality 100 (24hr., 48hr., 72hr.,) also at different Total number of pest concentrations (150 ppm, 300 ppm, 500 ppm) the more effective one is ethyl Standard deviations were calculated for acetate extract of Strychnos- nux-vomica three replicates and recorded for 24hr, leaves. And most significant result is 48hr and 72hr. produced after 72hr treatment i.e. 100% mortality. 268 Tom Cherian et al., JIPBS, Vol 2 (3), 266-272, 2015 Table 1: Mortality percentage of Sitophilus oryzae treated with plant extracts of Strychnos- nux-vomica by disc method. Name of the plant Conc. No. of Mortality (%) (Solvent) (ppm) insects 24(hr) 48(hr) 72(hr) used in (%) (%) (%) the study Strychnos-nux-vomica 500 25 86±0.08 87±0.07 87±0.05 (Petroleum ether) 300 25 75±0.05 79±0.06 78±0.08 150 25 68±0.07 74±0.08 73±0.09 Control - 25 - - - Strychnos-nux-vomica 500 25 74±0.08 82±0.06 84±0.08 (Ethanol) 300 25 68±0.03 74±0.05 75±0.08 150 25 60±0.08 68±0.09 70±0.07 Control - 25 - - - Strychnos-nux-vomica 500 25 96±0.02 98±0.05 100±0.03 (Ethyl acetate) 300 25 92±0.04 90±0.06 96±0.06 150 25 88±0.08 85±0.06 90±0.07 Control - 25 - - - *values are mean percentage of three replication of experiment with 25 insects, ± SD 100 80 60 Petroleum ether Ethanol 40 Ethyl acetate Mortality in % 20 0 100 200 300 400 500 Concentration (ppm) Graph1: Mortality percentage after 24hour treatment of Sitophilus oryzae with Strychnos- nux-vomica.
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