http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/1061 2026-05-01T04:32:41Z 2026-05-01T04:32:41Z Kumar, Saurav http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/1089 2025-10-21T07:37:58Z 2005-02-17T00:00:00Z

Title: Grinding characteristics and hydration properties of coconut residue: A source of dietary fiber Authors: Kumar, Saurav Abstract: After the extraction of coconut milk from the disintegrated coconut grating, the spent grating (residue) can be utilized as dietary fiber. The fiber was ground in a disc mill and grinding characteristics were evaluated by calculating work index (0.206 kW h/kg) as well as Bond s (0.065 kW h/kg), Kick s (0.047 kW h/kg) and Rittinger s (0.022 kW h/kg) constants. The reduction in the particle size from 1127 to 550 lm resulted in increased hydration properties (water holding, water retention, swelling capacity), which may be due to increase in theoretical surface area and total pore volume as well as structural modification. Beyond 550 lm, the hydration properties were found to decrease with decrease in particle size during grinding. The fat absorption capacity was found to increase with decrease in particle size. The study of microstructures revealed that the grinding operation resulted in rupture of honey comb physical structure fiber matrix and resulting in flat ribbon type structure, thereby providing increased surface area for water and fat absorption

2005-02-17T00:00:00Z Kumar, Saurav http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/1088 2025-10-21T07:32:41Z 2011-07-29T00:00:00Z

Title: Cytotoxicity and antioxidant activity of 5-(2,4-dimethylbenzyl)pyrrolidin-2-one extracted from marine Streptomyces VITSVK5 spp. Authors: Kumar, Saurav Abstract: The aim of the present study was to evaluate the cytotoxicity and antioxidant activity of 5-(2,4-dimethylbenzyl)pyrrolidin-2-one (DMBPO) extracted from marine Streptomyces VITSVK5 spp. The strain was isolated from sediment samples collected at the Marakkanam coast of Bay of Bengal, India. Systematic screening of isolates for anti-Aspergillus activity resulted in the identification of Streptomyces species designated as Streptomyces VITSVK5 spp. Bioactivity guided extraction and purification yielded a compound 5-(2,4-dimethylbenzyl)pyrrolidin-2-one (DMBPO) and was tested for cytotoxicity and antioxidant activity. The structure of the extracted compound was established by spectroscopic studies and identified as 5-(2,4-dimethylbenzyl)pyrrolidin-2-one (DMBPO). DMBPO exhibited cytotoxic activity on HEP 2 and Hep G2 cell lines with the IC50 value of 2.8 lg/ml and 8.3 lg/ml, respectively, as compared to Vero cell line (22.6). DMBPO showed the hemolytic EC50 value of 288 lg/ml on human erythrocytes. DMBPO treatment showed fewer (31.7%) aberrations, gaps and chromatid breaks as compared to untreated controls (27.8%) of human chromosomes. DMBPO also exhibited significant (44.13% at 5 lg/ml DMBPO) DPPH radical scavenging activity and total antioxidant activity (50.10% at 5 lg/ml DMBPO). The results of this study showed that DMBPO is cytotoxic to cancer cells and possesses antioxidant property

2011-07-29T00:00:00Z Kumar, Saurav http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/1084 2025-10-21T07:11:37Z 2018-01-01T00:00:00Z

Title: Biofloc improves water, effluent quality and growth parameters of Penaeus vannamei in an intensive culture system Authors: Kumar, Saurav Abstract: Biofloc technology was evaluated with a view to analyse utilization of nitrogenous waste from the effluent and to improve water quality and growth parameters of Penaeus vannamei in intensive culture system. The experiment was carried out in two different treatment outdoor earthen ponds of 0.12 ha, one supplemented with carbon source (molasses, wheat and sugar) for biofloc formation and other was feed based control pond with a stocking density of 60 animals m 2 in duplicate for 120 days. Water, sediment and P. vannamei were sampled at regular intervals from the both set of ponds for evaluating physicochemical parameters, nitrogen content and growth parameters, respectively. A significant reduction in the concentration of total ammonia nitrogen (TAN) and nitrite (NO2-N) were found in the biofloc pond than that of control pond. A significant low level of nitrogen was recorded in the effluents of biofloc pond in comparison to the control. In biofloc system, a significantly elevated heterotrophic bacterial count along with reduction in total Vibrio count was noticed. A significant improvement in the feed conversion efficiency (FCR) and growth parameters of P. vannamei was noticed in the biofloc pond. Growth of P. vannamei in the biofloc pond showed positive allometric pattern with an increased survival. The microbial biomass grown in biofloc consumes toxic inorganic nitrogen and converts it into useful protein, making it available for the cultured shrimp. This improved FCR and reduced the discharge of nitrogenous waste into adjacent environment, making intensive shrimp farming an eco-friendly enterprise.

2018-01-01T00:00:00Z Kumar, Saurav http://pucir.inflibnet.ac.in:8080/jspui/handle/123456789/1081 2025-10-21T07:02:31Z 2022-06-16T00:00:00Z

Title: Shellac as a multifunctional biopolymer: A review on properties, applications and future potential Authors: Kumar, Saurav Abstract: Shellac is a physically refined form of lac resin, a natural biopolymer of animal origin obtained from tiny insects feeding on the sap of specific host trees. Shellac, in its basic form, is a polyester macromolecule composed of inter and intra esters of polyhydroxy aliphatic and sesquiterpene acids. It has been used in several industries for ages due to its exceptional properties such as film-forming, adhering, bonding, thermoplasticity, water-resistance and easy solubility in spirit and aqueous alkali solvents. From the beginning of the 21st century, due to increasing demand for natural products, a paradigm shift in the scope and applications of shellac has been witnessed, especially in green electronics, 3D printing, stealth technology, intelligent sensors, food and pharmaceutical industries. Shellac offers enormous potential for greener technologies as a natural and environmentally friendly material. This review provides an insight into the lac in detail, covering various forms of the lac, structure, properties, different applications of shellac and its future potential. This article would benefit the researchers involved in shellac research and others looking for natural and greener alternatives to synthetic polymers in various applications.

2022-06-16T00:00:00Z