Papers by Suyogkumar Taralkar
Desalination, Nov 1, 2011
Supported ultrafiltration (UF) membranes based on poly(acrylonitrile) were prepared while varying... more Supported ultrafiltration (UF) membranes based on poly(acrylonitrile) were prepared while varying crucial parameters responsible for controlling membrane porosity, viz.; polymer concentration, solvent and additives in the dope solution. Insight into membrane porosity and morphology was obtained by water flux, solute rejection, bubble point, pore size distribution, SEM and AFM analyses. It was found that merely increasing polymer concentration does not necessarily reduce pore size of membranes. Among four solvents used for the dope solution preparation, N-methyl pyrrolidone was found to offer membranes with optimal combination of flux and rejection of various solutes. Some of the PAN 17 (17% w/w PAN concentration in the dope solution) membranes prepared using organic acid as the additive (citric acid, tartaric acid or maleic acid) offered 1.2-1.7 times higher flux than the membrane prepared using inorganic salt, ZnCl 2 as an additive. The porosity of PAN 17 membrane prepared using CA as an additive was larger as compared to membrane prepared using ZnCl 2 as an additive. Atomic force microscopy (AFM) analysis of this membrane exhibited higher surface roughness as compared to the ZnCl 2 based membrane. Both these membranes exhibited bacteria (E. Coli) log reduction value (LRV) of at least 6; depicting applicability of these membrane for water disinfection.
Trends and Developments, 2015
Heat sensitive medicinal ingredients present in herbs make them very expensive in the market. Hen... more Heat sensitive medicinal ingredients present in herbs make them very expensive in the market. Hence, utmost care must be taken while drying herbs to preserve them for a longer duration without much loss of these chemicals. Out of several existing methods Microwave drying of herbs has become quite popular in recent years for reducing the total drying time. However, there are problems of non-uniformity of temperature inside the wet herbs and thus hot and cold spots appear. In this article a mathematical model is proposed to analyze the microwave actuated drying behavior of herbs. It takes into account sample shrinkage, variable thermal and electromagnetic properties. The numerical solution was developed using an implicit finite difference method in one dimensional system. It allows predicting temperature profiles and heating time. The model was validated with laboratory tested experimental data of Aloe vera (Aloe barbadensis Mill.). A considerably high agreement is found between predicted and measured values.
Ursolic and betulinic acids are very useful nutraceuticals available in herbs. Their quantitative... more Ursolic and betulinic acids are very useful nutraceuticals available in herbs. Their quantitative estimation from the solvent extracts of the herbs is a great challenge. So far all the chromatographic methods available for identification and quantification of these acids are distinctly different, meaning thereby, each acid would require a separate method. Reverse phase (RP-HPLC) method is developed for determination of ursolic acid and betulinic acid from their methanol extract of Vitex negundo Linn leaves. Analysis was carried out using Waters' symmetry C-18 column with acetonitrile: methanol (80:20) as isocratic elution mode with UV detection (λ=210 nm). The method is pretty linear for ursolic acid in the range of 0.01-0.1 mg/ml (R 2 = 0.9961) and for betulinic acid in the range of 0.003-0.018 mg/ml (R 2 = 0.999). The peaks of ursolic acid and betulinic acid were confirmed by LC-MS. The method was validated by mixing these acids standards in methanol and found that it is accurate, sensitive and has a good reproducibility.
Mathematical modelling of solid-liquid extraction process of active ingredients from medicinal pl... more Mathematical modelling of solid-liquid extraction process of active ingredients from medicinal plants plays a crucial role in basic research of herbal extraction. It is very important to select the best fitted mathematical model with experimental data for estimation of diffusion/mass transfer coefficient. In this paper, efforts have been made to explain the various mathematical models (unsteady state diffusion model, extraction kinetics model, and mass transfer model) for solid-liquid extraction process are explained with experimental data.
Curcuma Longa (Turmeric) is herb and considered an effective medicine in Ayurveda. It contains nu... more Curcuma Longa (Turmeric) is herb and considered an effective medicine in Ayurveda. It contains number of active ingredients like curcuminoids, turmerone, etc. Curcuminoids is one of the important active ingredients and has number of medicinal uses such as anti-inflammatory, anti –HIV, antitumour, antiviral, anticancer, antifungal and ant parasitic. In present study, soxhlet extraction experiment was carried out for extraction of crude curcuminoids. Isolation of curcuminoids was done with crystallization. The anti-inflammatory activity was also evaluated.
The photocatalytic reactors can operate using catalyst suspended in the solution or immobilized o... more The photocatalytic reactors can operate using catalyst suspended in the solution or immobilized on various supports. Photocatalytic reactors with suspended catalyst give much better contact between the photocatalyst and dissolved impurities comparing to reactors with immobilized catalyst. Titanium dioxide (TiO 2) is a promising photocatalyst, when exposed to sunlight or UV rays, it decomposes the phenol present in wastewater. The available reactors are not so efficient in terms of light contact pattern. The aim of the present study was to design the new reactor and analyze its performance for removal of phenol from water with Titanium dioxide as the photocatalyst. The various parameters were studied to observe the behavior of designed reactor like variations in the initial feed concentration of phenol, mass of catalyst, and change in the intensity of UV light & its source, and aeration of the system. The reactor performance was evaluated on the basis on change in concentration with ...
Herbs are well known for their medicinal values and they are used for the same purpose since many... more Herbs are well known for their medicinal values and they are used for the same purpose since many years. Ocimum Sanctum Linn (Tulsi) is one of the common herbs for its various medicinal applications. Eugenol is the important ingredients found in tulsi. In this work, efforts have been made to extract eugenol by solvent extraction from tulsi leaves. The extracted samples were analysed with GC for determination of eugenol content. Kinetic model has been used to analyze the experimental data.
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Papers by Suyogkumar Taralkar