Dr. Ramavatar Meena

Designation: Sr. Scientist
Phone No:
Phone Ext. No: 6990
E-Mail: rmeena[at]csmcri.res.in

Research Activities

Natural polymers, Preparation of novel and advanced bio-based materials, Biosynthesis of metal nanoparticles, Natural Products Chemistry, Bioactive substances, Hydrogels, Energy materials.


Biopolymers based sustainable and advanced/functional materials

[52]. Chitosan-Based Aerogel Membrane for Robust Oil-in-Water Emulsion Separation.Jai Prakash Chaudhary, Nilesh Vadodariya, S. K. Nataraj*, Ramavatar Meena*. ACS Applied Materials & Interfaces, 2015 Nov 11; 7 (44), 24957-62.

[51]. A green and sustainable approach to utilize bio-ionic liquids for the selective precipitation of high purity agarose from an agarophyte extract. M. Sharma, J P Chaudhary, D. Mondal, Ramavatar Meena*, K. Prasad*. Green Chem., 2015, 17, 2867-2873.

[50]. Seaweed-derived polymeric materials for multiapplications including marine algal cultivation. J. P. Chaudhary, Dharmesh Chejara, K. Eswaran, Ramavatar Meena*, P K Ghosh*. RSC advances, 2015, 5, 19426 –19431.

[49]. Carboxymethylagarose-AuNPs generated through green route for selective detection of Hg2+ in aqueous medium with a blue shift. J. P. Chaudhary, A. Kumar, P. Paul*, Ramavatar Meena*. Carbohydrate Polymers,117, 2015, 537–542.

[48]. Fundamental studies on the feasibility of deep eutectic solvents for the selective partition of glaucarubinone present in the roots of Simarouba glauca. Kholiya F, Bhatt N, Rathod MR, Ramavatar Meena, Prasad K.. J. Sep. Sci. 2015 Jul 14. doi: 10.1002/jssc.201500470.

[47]. Culture of red alga Sarconema filiforme in open waters and hybrid carrageenan from cultivated seaweeds. M. Ganesan, Ramavatar Meena, A.K.Siddhanta, K. Selvaraj, K. Chithra. Journal of Applied Phycology: Volume 27, Issue 4 (2015), Page 1549-1559.

[46]. Functional modification of agarose: Synthesis of nano-size half-esters of succinic, phathalic and maleic acids. S. Kondaveeti, N. A. Chudasama, J P Chaudhary, Ramavatar Meena, A K Siddhanta. Indian J Chemistry, 54A, 2015, 734-743.

[45]. Agarose based multifunctional materials: Evaluation of thixotropy, self-healability and stretchability. JP Chaudhary, D R Chejara, D Makwana, K Prasad, Ramavatar Meena*. Carbohydrate Polymers,114, 2014, 306–311.

[44]. Bio-based super hydrophilic foam membranes for sustainable oil-water separation. JP Chaudhary, SK Nataraj*, A. Gogda, Ramavatar Meena*. Green Chemistry, 2014,16, 4552-4558.

[43]. Surfactant-induced coagulation of agarose from aqueous extract of Gracilaria dura seaweed as an Energy-efficient alternative to the conventional freeze–thaw process. Ramavatar Meena*, J. P. Chaudhary, P. K. Agarwal, P. Maiti, S. Chatterjee, H. D. Raval, P. Agarwal, A. K. Siddhanta, K. Prasad & P. K. Ghosh*. RSC Adv., 2014, 4, 28093–28098.

[42]. Antioxidant activity and phytochemical analysis of a few Indian seaweed species. D.R. Chejara, Stalin Kondaveeti, Ramavatar Meena, A. K. Siddhanta. Indian J Geo-Marine Science, 43, 4, April 2014, 507-518.

[41]. One-pot synthesis of biodiesel from high fatty acid Jatropha curcas oil using bio-based basic

ionic liquid as a catalyst. RamaMohan Reddy, M. Sharma, JP Chaudhary, Hetal B., Ramavatar Meena*. Current Science, 106, 10, 1394-1400, 2014.

[40]. Microwave-assisted synthesis of kC/Xylan/PVP-based blend hydrogel materials: physicochemical and rheological studies. Ramavatar Meena* , R. Lehnen, Bodo Saake*. Cellulose, 21, 1, 553-568, Feb. 2014.

[39]. Preparation and Functional Evaluation of Agarose Derivatives. J. P. Chaudhary, S. Kondaveeti, V. Gupta, K. Prasad, Ramavatar Meena*. Journal of Applied Polymer Science, 131, (16) 2014, DOI: 10.1002/APP.40630.

[38]. Physicochemical and rheological properties of agarose/xylans composite hydrogel materials. Ramavatar Meena*, R. Lehnen, U. Schmitt, Bodo Saake*. Polymer Composites, 34, (6), 978–988, 2013.

[37]. Fuel intermediates, agricultural nutrients and pure water from Kappaphycus alvarezii seaweed. D. Mondal, M. Sharma, P. Maiti, K. Prasad,Ramavatar Meena, A. K. Siddhanta, P. Bhatt, S. Ijardar, V. P. Mohandas, A. Ghosh, K. Eswaran, B. G. Shah & P. K. Ghosh. RSC Advances, 3, 39, 2013, 17989-17997.

[36]. Controlled- release performance of chitosan-polyuronic acid adducts. Mahesh U Chhatbar, Chirag B Godiya, Ramavatar Meena and A K Siddhanta. Ind J Chem A, 52A, 10, 2013, 1269-1274.

[35]. Facile synthesis of fluorescent polysaccharides: Cytosine grafted agarose and ?-carrageenan. Mihir D. Oza, Ramavatar Meena, A.K. Siddhanta. Carbohydrate Polymers, 87, 3, 2012, 1971–1979.

[34]. Microwave assisted synthesis of pH-responsive swellable adducts of chitosan–polyuronic acids. Ramavatar Meena, Mahesh U. Chhatbar, Kamalesh Prasad, A.K. Siddhanta*. Carbohydrate Polymers, 83 (3), 30 2011, 1402-1407.

[33]. Effect of oat spelt and beech xylan on the gelling properties of kappa-carrageenan hydrogels. Ramavatar Meena*, R. Lehnen, U. Schmitt, Bodo Saake*. Carbohydrate Polymers, 85 (3), 2011, 529-540.

[32]. Microwave-induced facile synthesis of water-soluble fluorogenic alginic acid derivatives. Mahesh U. Chhatbar, Ramavatar Meena, Kamalesh Prasad, Dharmesh R. Chejara, A.K. Siddhanta. Carbohydrate Research, 346 (5), 2011, 527-533.

[31]. Effect of grafting on the properties of kappa-carrageenan of the red seaweed Kappaphycus alvarezii (Doty) Doty ex Silva. Nivedita Sahu*, Ramavatar Meena*, M. Ganesan. Carbohydrate Polymers, 84 (1), 11 2011, 584-592.

[30]. Sulfated galactans of Champia indica and Champia parvula (Rhodymeniales, Rhodophyta) of Indian waters. S. Kumar, D. Nandan, Ramavatar Meena, K. Prasad and A. K Siddhanta. Journal of Carbohydrate Chemistry, 30, 2011, 47–60.

[29]. Preparation of superior quality products from Indian agarophytes. Ramavatar Meena*, K. Prasad, and A. K. Siddhanta. J Applied Phycology, 23 (2), 2011, 183-189.

[28]. The cellulose contents of Indian seaweeds. A. K. Siddhanta, M. U. Chhatbar, Gaurav K. Mehta, N. D. Sanandiya, Sanjay Kumar, Mihir D. Oza, K Prasad, Ramavatar Meena. J Applied Phycology, 23, 2011, 919-923.

[27]. Chemical investigation of Carrageenan from the red alga Sarconema filiforme (Gigartinales, Rhodophyta) of India. S. Kumar, G. K. Mehta, K. Prasad, Ramavatar Meena, A. K. Siddhanta. Natural product Communications, 6 (9), 1327-1332, 2011.

[26]. Glucogalactans from Gracilaria millardetii and Gracilaria textorii (Gracilariales, Rhodophyta) of Indian waters. Oza, Mihir, Mehta, Gaurav, Ramavatar Meena, Siddhanta, A K. Phycological Research, 59 (4), 244–249, 2011.

[25]. Functional modification of agarose: A facile synthesis of a fluorescent agarose–guanine derivative. Mihir D. Oza, Ramavatar Meena, Kamalesh Prasad, P. Paul, A.K. Siddhanta. Carbohydrate Polymers, 81 (4), 2010, 878-884.

[24]. Preparation of galactans from Gracilaria debilis and Gracilaria salicornia (Gracilariales, Rhodophyta) of Indian waters. Gaurav K. Mehta,Ramavatar Meena, K Prasad, M. Ganesan, A. K. Siddhanta. J. APPLIED PHYCOLOGY, 22 (5), 2010, 623-627.

[23]. Cellulose of Salicornia brachiate. N. Kumar K. Prasad, Ramavatar Meena and A. K. Siddhanta. Natural Product Communications, 5, 2010, 603- 606.

[22]. Detection and quantification of some plant growth regulators in a seaweed-based foliar spray employing a mass spectrometric technique sans chromatographic separation. Kamalesh Prasad, Arun K. Das, Mihir D. Oza, Harshad Brahmbhatt, Arup K. Siddhanta, , Ramavatar Meena, K. Eswaran, M.R Rajyaguru and Pushpito K. Ghosh. J. Agric Food Chem., 58 (8), 2010, 4594-601.

[21]. Development of a stable hydrogel network based on agar–kappa-carrageenan blend cross-linked with genipin. Ramavatar Meena, Kamalesh Prasad, A.K. Siddhanta. Food Hydrocolloids, 23 (2), 2009, 497-509.

[20]. Profiling of cellulose content in Indian seaweed species. A.K.Siddhanta, K. Prasad, Ramavatar Meena, Gayatri Prasad, G.K. Mehta, M U. Chhatbar, M D. Oza, S. Kumar, N. D. Sanandiya. Bioresource Technology, 100, (24), 2009, 6669-6673.

[19]. Microwave assisted rapid method for hydrolysis of sodium alginate for M/G ratio determination. Mahesh Chhatbar, Ramavatar Meena, Kamalesh Prasad, A.K. Siddhanta. Carbohydrate Polymers, 76 (4), 2009, 650-656.

[18]. Effect of Sodium Sulfate on the Gelling Behavior of Agarose and Water Structure inside the Gel Networks. Tejwant Singh, Ramavatar Meena, and Arvind Kumar. J. Phys. Chem. B, 2009, 113 (8), 2519–2525.

[17]. Facile preparation of Chaetomorpha antennina based porous polysaccharide-PMMA hybrid material by radical polymerization under microwave irradiation. G. Prasad, K. Prasad, Ramavatar Meena, and A. K. Siddhanta. J. Materials Science, 44, 2009, 4062-4068.

[16]. Agar/sodium alginate-graft-polyacrylonitrile, a stable hydrogel system. Mahesh U Chhatbar, Ramavatar Meena, Kamalesh Prasad and A.K. Siddhanta. Indian J. Chemistry, Section A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical Chemistry, 44A, 2009, 1085-1090 .

[15]. A new approach to functionalize agar and ?-carrageenan based thin films with improved barrier properties. Kamalesh Prasad, Ramavatar Meena , A K Siddhanta. J Polymer Materials, 25 (3), 373-380, 2008.

[14]. Facile solvent free synthesis of polymerised sucrose functionalised polyoxyethylene (23) lauryl ether by microwave irradiation. Kamalesh Prasad, P Bahadur, Ramavatar Meena, and A K Siddhanta. Green Chemistry, 10, 1288-1293, 2008.

[13]. Development of a robust hydrogel system based on agar and sodium alginate blend. Ramavatar Meena, Mahesh Chatbar, Prasad, Kamalesh and Siddhanta, A.K. Polymer International, 57, 2008, 329-336.

[12]. Superior quality agar from Gracilaria species (Gracilariales, Rhodophyta) collected from the Gulf of Mannar, India. Ramavatar Meena, Pasad, Kamalesh , Ganesan, M., Siddhanta, A.K. J Appl Phycol, 20, 2008, 397–402.

[11]. Preparation of Genipin fixed agarose hydrogel. Ramavatar Meena, Prasad, Kamaleshand Siddhanta, A.K. J Appl polym Sci,107, 2007,290-296.

[10]. Intermolecular complexation and phase separation in aqueous solutions of oppositely charged biopolymers. S. Santinath Singh, A.K. Siddhanta, Ramavatar Meena, Kamalesh Prasad, S. Bandyopadhyay, H.B. Bohidar. International Journal of Biological Macromolecules, 41 (2), 2007, 185-192.

[9]. Preparation, characterization and benchmarking of agarose fromGracilaria duraof Indian waters. Ramavatar Meena, A.K. Siddhanta, K. Prasad, B.K. Ramavat, K. Eswaran, S. Thiruppathi, M. Ganesan, V. A. Mantri, P.V. Subba Rao. Carbohydrate Polymers, 69 (1), 2007, 179-188.

[8]. Effect of genipin, a naturally occurring crosslinker on the properties of kappa-carrageenan. Ramavatar Meena, Kamalesh Prasad, A.K. Siddhanta. Int. J. Biological Macromolecules, 41, 2007, 94-101.

[7]. Studies on “sugar-reactivity” of agars extracted from some Indian agarophytes. Ramavatar Meena, Kamalesh Prasad, A.K. Siddhanta. Food Hydrocolloids, 20, (8), 2006, 1206-1215.

[6]. Synthesis of Carrageenan- graft-PAAm : Evaluation of its adhesive and absorbent properties. Ramavatar Meena, Prasad, Kamalesh and Siddhanta, A.K. J. Appl polym Sci, 102, 2006, 5144-5153.

[5]. Microwave induced rapid one pot synthesis of k-carrageenan-graft-MMA using potassium persulphate as initiating system. Prasad, Kamalesh, Ramavatar Meena,and A.K Siddhanta. J. Appl polym Sci, 101, 2006, 161-166.

[4]. Hydrogel forming agar-graft-PVP and carrageenan-graft-PVP blends: Rapid synthesis and characterization. Prasad, Kamalesh, Mehta, Gaurav, Ramavatar Meena, and Siddhanta, A.K. J Appl polym Sci, 102, 2006, 3654-3663.

[3]. Superior quality agar from Gelidiella acerosa of the west coast of India: An evaluation. Prasad, Kamalesh, Goswami, A.M., Ramavatar Meena , Ramavat, B.K and Siddhanta, A. K. Indian J of Marine Sci, 35 (3), 2006, 268-274.

[2]. Physical modification of agar: Formation of agar-fatty acid complex. Kamalesh Prasad, Keyur Trivedi, Ramavatar Meena, A. K. Siddhanta. Polymer Journal, 37 (11), 2005, 826-832.

[1]. Modification and characterization of some Indian seaweed polysaccharides. Ramavatar Meena*, Siddhanta, AK, Chattbar, MU, Prasad, K. Proceeding- in: 11th European Workshop on Lignocellulosics and Pulp (11th EWLP), 16-19 Aug. 2010, Hamburg, Germany, pg. 513-516.


[1]. Associate Fellow of Gujarat Science Academy. [2]. Awarded by prestigious fellowship - DST-BOYSCAST Fellowship 2009.

[3]. Editorial Board Member, Indian J. of Materials Science.


[9]. An improved one pot synthesis of [2,8-Bis (trifluoromethyl)-4-quinolinyl-2-pyridinyl methanone] a Mefloquine intermediate. H. P. S., Chawla; P. S. Johar; A., Mittal; Ramavatar Meena; V. S., Negi. U.S. Patent No. 6,500,955 Granted on December, 2002.

[8]. Process of preparation of biodegradable films from semi refined kappa carrageenan. P. K. Ghosh, A.K. Siddhanta, K. Prasad, Ramavatar Meena, A. Bhattacharya. US Patent No.US 7067568 B1; Granted on June 27, 2006.

[7]. A cost-effective process for preparing agarose from Gracilaria spp. A. K. Siddhanta, Ramavatar Meena, K.Prasad, B. K. Ramavat, P. K. Ghosh, K. Eswaran, S. Thiruppathi, V. A. Mantri. US Patent - US 2005/0267296 A1, 2005; PCT Patent No.: W0 2005/118830 A1; 2005.

[6]. Improved process for the preparation of agarose polymer from seaweed extractives. Ramavatar Meena, K. Prasad, A. K. Siddhanta, P. K. Ghosh, G. Mehta, B. K. Ramavat, M. S. Ganesan, B. Jha, A. Mishra, M. R. Gandhi, P. K. Agarwal, K. Eswran. PCT patent No.: WO2010109289 A8; 03-03-2011. European patent application No.: EP 10715346.2 – 2115.

[5]. Biodegradable hydrophobic composite materials and process for the preparation thereof. Ramavatar Meena, P. K. Ghosh, D. R Chejara, K. Eswran, A.K. Siddhanta, K. Prasad, J. P. Chaudhary. PCT: WO2014057502 A1, 2014; US Patent 20150274942 A1; 2015.

[4]. Bio-adhesive nanocomposite guar gum ion gels and process for the preparation. K. Prasad, M. Sharma, D. Mondal, C. K. Mukesh, Ramavatar Meena. Indian Patent No. IN2012DE02651, 2014.

[3]. Seaweed polysacchrides based superhydrophilic foam membrane for energy-efficient oil-water separation. Ramavatar Meena, N. Sanndiya, J. P. Chaudhary, D. Mondal & S K Natraj. PCT WO 2015056273 A1, 2015.

[2]. An integrated process to recover a spectrum of bioproducts from fresh seaweeds. C. R. Reddy, R. S. Baghel, N. Trivedi, P. Kumari, V. Gupta, K. Prasad, Ramavatar Meena. PCT: WO2015102021 A1, 2013.

[1]. Process for the preparation of graded Agarose from seaweed extract. Ramavatar Meena and J. P. Chaudhary. Provisional Patent: DEL201611002824, 27/01/2016.

Book Chapters/Review Articles

[6]. Seaweed Polysaccharides Based New Hydrogel Materials: A Green Approach.J. P. Chaudhary & Ramavatar Meena*. Micro- and Nanostructured Polymer SystemsFrom Synthesis to Applications,

Edited by Sabu Thomas, Robert Shanks, and Jithin Joy, Apple Academic Press 2015, Pages 75–92,

Print ISBN: 978-1-77188-100-5, eBook ISBN: 978-1-4987-2159-2, DOI: 10.1201/b19859-6 .

[5]. Synthesis of functional derivatives of cellulose for wider applications. Nilesh Vadodariya, J. P. Chaudhary, F. Kholiya & Ramavatar Meena*. Book entitled “Cellulose and Cellulose Derivatives: Synthesis, Modification, Nanostructure and Applications”Chapter-17, Pub. Date: 2015, Pages: 7x10 - (NBC-C), ISBN: 978-1-63483-150-5, Nova Publishers.

[4]. Grafting on Cellulosics - progress towards purpose. Ramavatar Meena & A. Bhattacharya.

Book entitled "Cellulose-Based Graft Copolymers: Structure and Chemistry" Cellulose-Based Graft Copolymers Structure and Chemistry, Edited by Vijay Kumar Thakur, CRC Press 2015, Pages 13–40, Print ISBN: 978-1-4822-4246-1, eBook ISBN: 978-1-4822-4248-5, DOI: 10.1201/b18390-3

[3]. Development of carbohydrate polymer based new hydrogel materials derived from seaweed polysaccharides. Siddhanta, A.K., Ramavatar Meena, Prasad, G., Chhatbar, M.U., Mehta, G.K., Oza, M.D., Kumar, S., Prasad, K. in “Handbook of Carbohydrate Polymers: Development, Properties and Applications” Ito, Ryouichi and Matsuo, Youta (Eds), Chapter 15. Series: Polymer Science and Technology 2010. ISBN: 978-1-60876-367-2. NOVA Science Publishers Inc., New York, 01-Jul-2010, pp. 555-582.

[2]. Agar and Value Addition of Indian Agarophytes. Ramavatar Meena and A K Siddhanta. In the monograph on “Recent Advances on Applied Aspects of Indian Marine Algae with Reference to Global Scenario”, Vol. 2 (A Tewari, Ed.), 2006; pp.172-184, CSMCRI Bhavnagar.

[1]. Seaweed polysaccharides, their bioactivity and value addition–the Indian perspective. A K Siddhanta, Ramavatar Meena, Kamalesh Prasad and A. Sai Krishna Murthy. In the monograph on Agar and Value Addition of Indian Agarophytes.In the monograph on “Recent Advances on Applied Aspects of Indian Marine Algae with Reference to Global Scenario”, Vol. 2 (A Tewari, Ed.), 2006; pp.229-243, CSMCRI, Bhavnagar.