Aniruddha Pandit | Institute of Chemical Technology, Mumbai (original) (raw)

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Papers by Aniruddha Pandit

International journal of pharmacy and biological sciences, Jul 1, 2011

Sophorolipids (SLs) are glycolipids type of biosurfactants and are produced by few of the nonpath... more Sophorolipids (SLs) are glycolipids type of biosurfactants and are produced by few of the nonpathogenic yeast species like Starmerella bombicola. In the present work, statistical experimental methodology was used to optimize the fermentative production of SLs from Starmerella Bombicola NRRL Y-17069 at the shake flask scale. The Placket-Burman screening experiments was applied to evaluate the significant variables that influence the production of Sophorolipids. It was found that pH, concentration of Yeast extract and the Concentration of Oleic acid are the most influential variables that affected the production of Sophorolipids. The optimum levels of these three variables were achieved by using a Box-Behnken design of the response surface methodology (RSM). The predicted maximal sophorolipid production of 18.32 g/L appeared at pH 3, and when the concentrations of yeast extract and oleic acid were 5 g/L, and 20 g/L, respectively. Under the proposed optimized conditions, the sophorolipid production reached 18.2 g/L. The correlation between predicted value and measured value of these experiments proved the validity of the response model.

The translocation behaviour of cytoplasmic β-galactosidase to periplasmic space and through the o... more The translocation behaviour of cytoplasmic β-galactosidase to periplasmic space and through the outside cell wall across the inner membranes of Kluveromyces lactis has been investigated to optimize the cell disruption process by ultrasonication for the production and separation of intracellular target biomolecule i.e. β-galactosidase. The translocation of β-galactosidase in the cells was judged by a concept of location factor (LF), which allows the location of the enzymes to be judged within the cell and has been determined using the relative rates of the enzyme and protein during the cell disruption process. The temperature was found to be useful external stimuli for the translocation of target enzyme (LF could be increased to one or more). The LF values were maximum when cells were subjected to heat stress between 45-50°C for a specified time. The enzyme activity was also found to decrease with an increase in the temperature. Maximum enzyme activity was found to be at 45°C of the heat treatment process for translocation. The kinetics of translocation of the target enzyme across the inner membrane has been reported on the basis of the variation in the location LF.

The Canadian Journal of Chemical Engineering

Industrial & Engineering Chemistry Research, 2019

The process intensification (PI) can significantly improve energy and process efficiency by enhan... more The process intensification (PI) can significantly improve energy and process efficiency by enhancing mixing, mass and heat transfer as well as driving forces. There are several benefits of such improvements, which includes energy and cost savings, enhanced safety and smaller reactor size, less waste generation and higher product quality. This review article focuses on the PI, discussion about its dimensions and structure, what it involves and recent developments in PI which can be achieved using the technique of cavitation. Recommendations for optimum operating parameters needed for process intensification using cavitation phenomena which has been reported in the literature have been presented along with some of our own work in the area. Some experimental case studies have been presented which highlight the degree of intensification achieved when cavitation is used for different physico-chemical transformations. These physicochemical transformations include crystallization, emulsification, extraction, wastewater treatment, depolymerisation and water disinfection.

Journal of Food Process Engineering, 2017

Chemical Engineering Journal, 2016

Separation and Purification Technology, 2015

Hydrodynamic cavitation has been effectively proven to be an efficient advanced oxidation process... more Hydrodynamic cavitation has been effectively proven to be an efficient advanced oxidation process on an industrial scale. The utility of hydrodynamic cavitation for microbial disinfection of seawater has been reported in this work. Seawater is used as cooling water in refineries and nuclear power plants or as ballast water in the shipping industry. Various norms and regulations of the International Maritime Organization (IMO) make it compulsory for ship owners to treat the ballasting seawater before discharging it into the sea. Also, if the seawater is not properly treated, it causes biofouling which affects the performance of cooling tower and other heat transfer equipments. It has been observed through our study that, hydrodynamic cavitation can be effectively used for microbial disinfection of seawater. Effectiveness of different types of cavitating devices for the extent of disinfection was studied. It was conclusively proved that, slit type of geometry consumes 40 % less energy compared to cylindrical geometry for similar extent of seawater disinfection. A combination of the conventional treatments of water disinfection such as chlorination and thermal treatment with hydrodynamic cavitation was found to increase the overall rate of disinfection significantly. Rate of reaction almost doubles when 5 ppm hypochlorite was used as disinfectant with the combination of cavitation compared to when only 5 ppm of hypochlorite was used. Similarly the rate of disinfection increases 2.5 times at 50 0 C in combination with cavitation compared to when, only 50 0 C was maintained and disinfection was carried out.

The objective of this research was to develop an alkali pretreatment process prior to anaerobic d... more The objective of this research was to develop an alkali pretreatment process prior to anaerobic digestion (AD) of napier grass for improving solubilization of the lignocellulosic biomass and subsequent enhancement in biogas productivity. Mild concentrations of sodium hydroxide solution were used to pretreat napier grass which and was later subjected to anaerobic digestion for production of biogas. Laboratory-scale batch experiments were carried out in 0.5 l bottles with 0.3 l working volume. Optimal concentration of sodium hydroxide solution for organics solubilisation in the step of pre-treatment was 0.6% (w/v) i.e. 11.2g of NaOH/100g TS of napier grass. Under this condition, the soluble chemical oxygen demand of the hydrolysate was increased by 93%, which subsequently increased the production of volatile fatty acids (VFA) during anaerobic digestion. The biogas production of napier grass with and without pre-treatment was evaluated. The highest methane yield under optimal pre-treatment condition was found to be 0.158m 3 CH 4 /kg TS, as compared to 0.047 m 3 CH 4 /kg TS for untreated napier grass when subjected to anaerobic digestion for a period of 8 days. These results indicated that alkali pre-treatment could be an effective method for increasing biodegradability and improving methane yield of napier grass.

Materials Science for Energy Technologies, 2022

Chemical Engineering and Processing, Nov 1, 2018

Journal of Crystal Growth, Mar 1, 2022

Ultrasonics Sonochemistry, 2017

Advances in Natural Sciences: Nanoscience and Nanotechnology, Aug 29, 2017

Zinc oxide (ZnO) nanoparticles are those nanoparticles which have been synthesized in various mor... more Zinc oxide (ZnO) nanoparticles are those nanoparticles which have been synthesized in various morphologies and shapes. Their size and shape dependent properties and their applications in vivid sectors of science and technology make them interesting to synthesize. Present work reports a green method for ZnO nanoparticle synthesis using lime juice and sunlight. ZnO nanoparticles were also synthesized by conventionally used methods like heating, stirring or no heating and/or stirring. The nanoparticles were characterized using different techniques like UV-vis spectroscopy, scanning electron microscopy (SEM), x-ray diffraction (XRD) and dynamic light scattering (DLS). Thermo gravimetric analysis (TGA) was also carried out for the intermediate product to select the calcination temperature. Stoichiometric study reveals that the intermediate product formed is zinc citrate dihydrate. The synthesized calcined nanoparticles have good crystallinity, uniform shape, and high purity and were in the size range of 20-30 nm. These nanoparticles formed agglomerates of various shapes in the size range of 200-750 nm. This process is ecofriendly and is amiable for easy scale up.

Chemical Engineering and Processing - Process Intensification

Industrial & Engineering Chemistry Research

Journal of Plant Nutrition, 2021

Abstract Biochar is one of the best and economical soil amendments as it helps in carbon sequestr... more Abstract Biochar is one of the best and economical soil amendments as it helps in carbon sequestration, retains soil nutrients, increases water retention capacity of the soil, attracts more beneficial microbes and thus improves the crop yield. Peanut shell (PNB) biochar is produced by slow pyrolysis at 300 °C, 400 °C, 500 °C and 600 °C. PNB produced at these various temperatures were characterized (pH, electrical conductivity, ash and moisture content, bulk density, FTIR, SEM, XRD, SBET and elemental analyses). Pot study was carried out with soil amended with PNB obtained at various temperatures and PNB in combination with N (Nitrogen) fertilizer on sorghum crops over 30 days. It is found that Biochar increased soil water retention capacity and N fertilizer utilization efficiency by the plants. PNB, in combination with urea, had a synergistic effect that enhanced sorghum crop growth (fresh and dry weight, height of the plant, stem diameter, leaf length, leaf area). PNB showed no significant effect on seed germination. Thus, PNB, in combination with urea, can be used as an effective soil amendment technique. Highlights Biochar amendment increased the soil water holding capacity Peanut shell biochar in combination with urea has a synergistic effect Increased N fertilizer utilization efficiency by the plants when biochar and N fertilizer applied together Enhanced sorghum crop growth due to biochar amendment Application of Peanut shell biochar showed no significant effect on seed germination