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2017 - 20182
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Subject: Chemistry × Author: Harpreet Kaur ×
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    ThesisItemOpen Access
    Chemistry and antimycotic potential of mentha based shellac coatings against penicillium digitatum of kinnow fruit
    (Punjab Agricultural University, Ludhiana, 2018) Harpreet Kaur; Tandon, Ritu
    The present study deals with chemistry and antimycotic potential of Mentha based shellac coatings against Penicillium digitatum of kinnow fruit. Essential oil (EO) of two species of Mentha viz. Mentha piperita and Mentha arvensis was extracted using Clevenger-type apparatus. Per cent yield of essential oil of M. arvensis (2.8%) was found higher than M. piperita (2.1%) Compositional analysis of M. piperita essential oil by GC-MS revealed presence of 51 compounds. M. piperita EO exhibited better antimycotic potential than M. arvensis EO against P. digitatum. Hence, Process of nanoemulsion (NE) development of M. piperita EO was optimized for parameters such as oil and surfactant ratio (v/v) with three sonication times (ST) with the help of probe ultrasonicator. Effect of surfactant concentration and sonication time on droplet diameter and electrical conductivity was studied. Nanoemulsion of 1:0.5 ratio of oil and surfactant with 20 min ST exhibited smallest droplet diameter as well as maximum stability at refrigerator temperature (4°C) than ambient temperature (25°C) over the storage period of 2 months. M. piperita based shellac nanoemulsions were prepared for the best.1:0.5 (v/v) oil and surfactant ratio. NE with 15 minute ST showed more effective inhibition (96.0%) against P. digitatum in comparison to other nanoemulsions as well as pure M. piperita EO (71.0%). Optical and SEM results showed morphological changes in treated fungus. Nanoshellac coating showed maximum inhibition at par with the standard Carbendazim.
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    ThesisItemOpen Access
    Synthesis and antifungal potential of copper fluoro carbamodithioates
    (Punjab Agricultural University, Ludhiana, 2017) Harpreet Kaur; Anjali
    Novel fluorinated carbamodithioato Cu(II) complexes were synthesized by one pot two step reaction protocol by the reaction of anilines with carbon disulfide followed by the addition of copper chloride. The synthesized Cu(II) complexes were analysed by CHN analysis, titrometric methods and spectral techniques. Their physical characterization colour and melting point were noted. All the synthesized organic complexes were screened for their in vitro antifungal potential against various phytopathogenic fungi viz. Bipolaris sorokiniana, Puccinia hordei and Puccinia striiformis by spore germination technique, using Propiconazole as positive control for comparison of the results. The complex 1a (tetraaquaphenylcarbamodithioatocopper(II) chloride) had inflicted highest fungitoxic potential against all the test fungi.