Dr. A.K.Siddhanta

Designation: Emeritus Scientist
Phone No:
Phone Ext. No: 6170
E-Mail: aks[at]csmcri.res.in

Research Activities

Project Leader of : In-house project "Functional modification of seaweed polysaccharides"; Miniistry of Earth Sciences funded project "Drugs from the Sea"


Organic Chemistry - Natural Products, Seaweed Polysaccharides and Gels





Arup Kumar Siddhanta

Date of Birth: March 30, 1954                                                                               Present Position and Address:  Scientist-F;                 Group Leader – Natural Products Chemistry Group   Marine Biotechnology & Ecology  Discipline                                                                  Central Salt & Marine Chemicals Research Institute (CSMCRI)                                                                     Council of Scientific & Industrial Research (CSIR) Bhavnagar 364 002, Gujarat, India.                      Phone:91-278-2567760 (Work);                         Mobile:91-9825189117;       Fax:91-278-2567562 (Work)

E-mail: aks@csmcri.org; siddhantaarupk@rediffmail.com ;                           Website: www.csmcri.org

Education (Post-Graduation onwards)  








Calcutta University



"Studies on heterocycles and organometallic compounds"


UGC-JRF (1975-1979); CSIR-SRF (1979-1980)


Calcutta University


M.Sc. (Chemistry)



Area of Specialisation : Organic Chemistry, Natural products chemistry; Bioactive compounds; Functional modification of seaweed polysaccharides; Polymers; Gels 

 Professional Experience:

·        Visiting Scientist (DFG, Germany), Physical Chemistry I, University of Bayreuth, Bayreuth,

       Germany, 2003 (July-September) [with Professor Heinz Hoffmann].

·        Post-doctoral Research Associate, Divn. of Medicinal Chemistry, Coll. of Pharmacy,

University of Texas, Austin, Texas, U S A, 1984-85 [with Dr David E Thurston].

·        Robert A Welch Fellow, Chemistry Laboratory,  Dept of Mol.Genetics, University of Texas Health Science Centre, Dallas, Texas, U S A, 1983-84 [with Professor J R Falck].

·        Post-doctoral Research Assistant SERC, UK), Chemistry Department, Glasgow University, Glasgow, Scotland, U K, 1980-83 [with Professor Brian Capon].

·        Research Fellow (CSIR, New Delhi), Chemistry Department, Calcutta University, Calcutta, 1978-80 [with Professor Avijit Banerji].

·        Research Fellow (UGC), Chemistry Dept., Calcutta University, Calcutta, 1975-78 [with Professor Avijit Banerji].

 Employment History:

·        Scientist F, Marine Biotechnology and Ecology Discipline, CSMCRI, Bhavnagar; 2007-present.

·        Scientist EII, Marine Biotechnology and Ecology Discipline, CSMCRI, Bhavnagar; 2002-2007.

·        Scientist EI, Marine Algae and Marine Environment Discipline, CSMCRI, Bhavnagar; 1997-2002.

·    Scientist C, Marine Algae Discipline, CSMCRI, Bhavnagar; 1992-1997.

·        Scientist B, Marine Algae Discipline, CSMCRI, Bhavnagar; 1988-1992.

·        Scientific Pool Officer, Marine Algae Discipline, CSMCRI, Bhavnagar; 1986-1988.

Invited Talks: Delivered invited talks in India and Germany in Symposia and University                   Departments

Ph.D. thesis examiner: Bhavnagar University, Madras University, Osmania University, Hyderabad; Calcutta University, Kolkata.

Reviewer: Review papers for various refereed journals including those of NISCOM, CSIR, New Delhi, Polymer journals of Wiley Interscience and Wiley-VCH Verlag GmbH & Co. KGaA; Natural Product Communications.

Ph D Students:  Five received Ph D; Two registered for PhD degree; 7 Students are currently working for PhD degrees; One did MSc Dissertation, under my supervision.


·        Research Papers: 57; Published a number of papers in prestigious journals (Acc Chem Res, J Org Chem, Tetrahedron Letters, Biophys Bichem Acta, Lipids, Org Magnetic Reson, Phytochemistry, Botanica Marina, Int J Biol Macromol, J  Phycology; J Applied Phycology; Polymer Journal (Japan); J Appl Polym Science; Polymer International, Food Hydrocolloids, Carbohydrate Polymers, Green Chemistry, J Polymer Materials, J Materials Science, Bioresource Technology, Indian J Exp Biol, Indian J Marine Sci, Separation Science and Technology; Indian J Chemistry A & B; J Indian Chemical Soc) in the areas of natural products chemistry of terrestrial plant, marine algae/seaweeds, animal (mammal),  functional modification of seaweed polysaccharides, hydrogels, enols and analytical chemistry. 

·        Patents – Co-inventor in four patents: One USP 6,893,479; dated  May 17, 2005; One US Patent  US Patent  No. US 7067568 B1; June 27, 2006;  One US Patent (US Patent Publication No. US 2005/0267296 A1) pregrant application published on December 1, 2005; one filed (September 2008).

Technology Transfers:  

(i) One patented technology "Integrated method for production of carrageenan and liquid fertilizer from fresh seaweeds" (USP 6,893,479) transferred to M/s Pepsico India Holdings Ltd. during 2005-2006.

(ii)  The technology entitled "Cultivation of Gracilaria edulis and Extraction of Agar Therefrom" was transferred to M/s Community Enterprise Forum International, New Delhi, during 2006-2007.  This technology is based on our patent entitled "A cost-effective process for preparing agarose from Gracilaria spp."(US 2005/0267296 A1; GB2429209).

(iii)   Demonstration of know how transfer for Sargassum based LSF on a 5 kg seaweeds batch  in the pilot plant (March 26-28, 2008).   The know how was transferred to M/s Jupiter Agriinputs Corporation, Vadodara.

  • Book Chapters: 3; Review Articles - 5; General Articles - 5.
  • Projects completed/being pursued:

(a) Ministry of Earth Sciences (MoES)-Drug Project: Principal Investigator (1990-


(b) Functional modification of seaweed polysaccharides for preparing new gels and materials (2008-2011; In-house project)

(b) Value addition of seaweeds and seaweed polysaccharides: Project Leader (2005-2008; in-house project).

(e) Modification of seaweed polysaccharides for special effects: Project Leader (2002-2005; in-house project).

(f) DBT/In-house Project on seaweed polysaccharides- "Improvements in Cultivation of Agarophytes, Carrageenophytes and their Phycocolloid Extraction Procedures": Member of the team (2000-2004).

(c)  Industry Project: Feasibility studies on the development of carrageenan-based hard capsule material: Project Leader (2007-2008)

(d) Industry Project:Development of seaweed polysaccharide-based soft gelatin capsule material: Project Leader (2004-2006)

  • Members of Indian Chemical Society, Kolkata; Seaweed Research Utilisation Association, Society of Chemists and Biologists, Lucknow
  • Member on the Editorial Board (2008-2012) of Indian J Mar Sci, NISCAIR, CSIR, New Delhi.
  • Member of the Bhavnagar University Court (Senate) (October 2008 – October 2013).                                          

HRD Experience:  More than 40 students/research staff have carried out R&D works under my supervision, five of them received their PhD degree and one did his MSc Dissertation. Five students are working in projects under my supervision for their PhD degrees. 

Arup Kumar Siddhanta, Ph.D.


1.         Patent entitled "Integrated method for production of carrageenan and liquid fertilizer from fresh seaweeds". Karuppanan  Eswaran, Pushpito Kumar Ghosh, Arup Kumar Siddhanta, Jinalal Shambhubhai Patolia, Chellaiah Periyasamy, Aditya Shantibhai Mehta, Kalpana Haresh Mody, Bharatkumar Kalidas Ramavat, Kamalesh Prasad, Mahesh Rameshchandra Rajyaguru, Singaram Kulandaivel Chennur Radhakrishna Reddy, Jayant Batukrai Pandya, Akhilesh Tewari.

  • U.S. Patent No. 6,893,479, dated  May 17, 2005 (granted);
  • PCT WO 2004/016656 A1; February 26, 2004 (published in the gazette); national phase filings in progress;
  • Indian Patent Application No. 0133/DEL/2003A, dated  March 16, 2007;
  • Australian Patent Publication No. AU2002337438 dated Mar 03, 2004;
  • Chinese Patent Publication No. CN 1324052C dated 2007-7-4;  
  • European Patent No. EP 1534757 B1; 10-05-2006;
  • Denmark Patent No. DK/EP 1534757; 12-06-2006.
  • Korea Patent No. 06,89,982.
  • Indonesian Patent No. 0019080; April 10, 2007.

2.         Patent entitled "A cost-effective process for  preparing agarose from Gracilaria spp". Arup Kumar Siddhanta, Ramavatar Meena, Kamalesh Prasad, Bharatkumar Kalidas Ramavat, Pushpito Kumar Ghosh, Karuppanan Eswaran, Sangaiya Thiruppathi, Vaibhav Ajit Mantri.   

  • US Patent Publication No. US 2005/0267296 A1 (pregrant); December 1, 2005;
  • PCT Patent Publication No.: W0 2005/118830 A1; December 15, 2005 (published in the gazette); national phase filings in progress;
  • UK Patent published:   GB2429209; February 21, 2007.
  • Canadian Patent Published:  CA 2 569 495 A1; December 12, 2006.
  • Indian Patent Application No. 1189/DEL/2004 A; June 25, 2004.
  • Chinese patent published: CN 1993474A dated 2007-7-4.

3.         Patent entitled "Process of preparation of biodegradable films from semi refined kappa carrageenan. Pushpito Kumar Ghosh, Arup Kumar Siddhanta, Kamalesh Prasad, Ramavatar Meena, Amit Bhattacharya. 

  • US Patent No.US 7067568 B1; June 27, 2006;
  • PCT Patent Publication No. WO 2006/059180 A2 (published in the gazette); national phase filings in progress.
  • Australian Patent Office: AU2004325362 A1 dated 08/06/2007.
  • UK Patent GB 2435768 A; September 5, 2007.

4.         A US and PCT patent application with full specifications entitled "Improved process for the preparation of agarose polymer from seaweed extractive" (Ramavatar Meena, Kamalesh Prasad, Arup Kumar Siddhanta, Pushpito Kumar Ghosh, Gaurav Mehta, Bhartkumar Kalidas Ramavat, Meenakshi Sundaram Ganesan, Bhavanath Jha, Avinash Mishra, Mahesh  Ramniklal Gandhi, Pradeep Kumar Agarwal, Karuppanan Eswaran). Sent to CSIR for filing on September 23, 2008.

  • Indian patent application No. 0567/DEL/2009 dated 24/03/2009.
  • US and PCT Patent applications filed.

Technology Transfers  

(i)         One patented technology "Integrated method for production of carrageenan and liquid fertilizer from fresh seaweeds" (USP 6,893,479) transferred to M/s Pepsico India Holdings Ltd. during 2005-2006.

(ii) The technology entitled "Cultivation of Gracilaria edulis and Extraction of Agar Therefrom" was transferred to M/s Community Enterprise Forum International, New Delhi, during 2006-2007.  This technology is based on our patent entitled "A cost-effective process for  preaparing agarose from Gracilaria spp." (US 2005/0267296 A1; GB2429209).

(iii) Demonstration of know how transfer for Sargassum based LSF on a 5 kg seaweeds batch  in the pilot plant (March 26-28, 2008).   The know how was transferred to M/s Jupiter Agriinputs Corporation, Vadodara.

Dissertations Guided

Ph D Dissertations

(i) Mr  M  Shanmugam  was awarded Ph.D. degree in Chemistry of Bhavnagar University in December 1998, for his thesis entitled Studies on the Biomedically and Industrially Important Metabolites of Indian Marine Algae, [Guide : Dr A K  Siddhanta].

(ii)  Mr A  Sai Krishna Murthy was awarded Ph D degree in Chemistry of Bhavnagar University in November 2000, for his thesis entitled Chemical investigation of Indian marine algae with special reference to water soluble metabolites [Guide : Dr A K  Siddhanta].

(iii) Mr A M  Goswami was awarded Ph D degree in Chemistry of Bhavnagar University in January 2001,  for his thesis entitled Chemical studies on the metabolites of Indian marine algae [Guide : Dr A K  Siddhanta].

(iv)             Mr Kamalesh Prasad, Scientist C, was  awarded Ph D degree in Chemistry of Bhavnagar University in December  2005,  for his thesis entitled Chemical and Rheological Characterization of Seaweed Polysaccharides [Guide: Dr A K Siddhanta].

(v) Mr Ramavatar Meena, Scientist C, was awarded Ph D degree in Chemistry of Bhavnagar University in December  2007,  for his thesis entitled Chemical Studies on the Polysaccharides of Indian Seaweeds with Special Reference to Agar [Guide: Dr A K Siddhanta].

M Sc Dissertation

(i) Mr Deepak Kumar Sinha carried out project work (January-June 2004)  of M Sc (Biotechnology) Semester IV Course of Tilkamanjhi Bhagalpur University and submitted a dissertation in June 2004,  entitled DNA Characterization of the Red Seaweed Eucheuma cottonii & Chemical Investigation of Seaweed Polysaccharides (e.g. Agar & Carrageenan).

(Guide: Dr A K  Siddhanta; Co-guide : Dr C R K Reddy).


Arup Kumar Siddhanta,  Ph.D.


Research Papers

1.         Banerji,   A.;   Ray,   R.;   Siddhanta,   A.  and  Pal,  S., "Constituents  of  Piper  sylvaticum and  Piper  aurantiacum".  Indian J. Chem. 17B: 538, 1979.

2.         Banerji,  A.; Siddhanta, A.K.; Acharya, A.K. and Dutta, C.P., "Carbon-13  NMR  Spectroscopy  of  Kawa-pyrones".  Org.  Mag.  Reson. 13: 345-48, 1980.

3.         Banerji,  A.  and Siddhanta,  A.K., "Studies on Kawa-pyrones: Synthesis of 5,6-  Dehydrokawain". Current Science (India), 49,  845-47, 1980.

4.         Banerji,  A.  and  Siddhanta,  A.K.,  "Schloraine:  An Indole Alkaloid of Alstonia scholaris".  Phytochemistry, 20: 540-42, 1981 [IF 2.322].

5.         Banerji, A. and Siddhanta, A.K., "3,4-Bond Cleavage of Tetrahydro--carboline  Alkaloids: Transformation of  Venenatine and Rhazine to the 2-Acylindole Derivatives".  J. Indian Chem. Soc. 59: 542-47, 1982.

6.         Banerji,  A.; Siddhanta, A.K. and Ghosal, T., "Metal Reagents in  organic reactions:  Part III - 1,2-Diamination of Styrene Utilizing Amino-mercuration Reaction".  Indian J.  Chem.   21B:464-66, 1982.

7.         Capon, B. and Siddhanta, A.K., "The Stereochemistry of Simple Enols in Solution".   Tet. Lett. 23: 3199-3202, 1982.

8.         Falck, J.R.; Manna, S.; Siddhanta, A.K.; Capdevila, J. and Buynak,  J.D., "Transformation of 15-HETE to 14,15-Dihydroxyeicosatrienotic  acid and 11,14,15- and  13,14,15-trihydroxyeicosatrienoic acid". Tet. Lett., 24: 5715-5718, 1983.

9.         Capon,  B.  and Siddhanta, A.K., "Simple Enols 3. The Stereochemistry of Simple Enols in Solution".  J.  Org.  Chem., 49: 255-257, 1984.

10.       Falck,  J.R.; Siddhanta, A.K.; Estabrook, R.W.; Capdevila, J. and Mioskowski,  C.,  "5- and 8-HETE Production by Rat Hepatic Microsomal Cytochrome  P-450".  Tet.  Lett.,  25:  1457-1458, 1984.

11.       Banerji,  A.;  Bondopadhyay, D.; Sarkar, M.; Siddhanta, A.K.; Pal,  S.C.;  Ghosh,  S.;  Abraham,  D.  and  Shoolery,  J.N., "Structural  and Synthetic Studies on the  Retrofractamides  -  Amide  Constituents of Piper  retrofractum".  Phytochemistry,  24:  279-284, 1985.

12.       Capon,  B.;  Siddhanta,  A.K. and Zucco, C., "Simple Enols 4. The  Generation of Some New Simple Enols in Solution and  the Kinetics and Mechanisms of Their Ketonization".  J. Org. Chem. 50: 3580-3584, 1985.

13.       Falck,   J.R.;   Manna,   S.;  Viala,  J.;  Siddhanta,  A.K.; Moustakis,  C.A. and Capdevila J., "Arachidonate Epoxygenase: Inhibitors and Metabolite Analogues".  Tet. Lett.  26:  2287- 2290, 1985.

14.       Toto,  R.;  Siddhanta,  A.K.; Manna, S.; Pramanik, B.; Falck, J.R.  and  Capdevila,  J., "Arachidonic  Acid  Expoxygenase: Detection  of  Epoxyeicosatrienoic  Acids  in   Human Urine".  Biochim. Biophys. Acta, Lipids and Lipid Metabolism, 919: 132-139, 1987 [IF 2.371].

15.       Falck, J.R.; Schueler, V.J.; Jacobson, H.R.; Siddhanta, A.K.; Pramanik,  B.  and  Capdevila,  J., "Arichidonate Epoxygenase:  Identification   of   Epoxyeicosatrienoic  Acids  in   Rabbit  Kidney". J. Lipid Res. 28: 840-846, 1987 [IF 3.893].

16.       Banerji,   A.;   Bandyopadhyay,   D.   and  Siddhanta,  A.K., "Synthesis of Retrofractamide  A".  Phytochemistry,  26: 3345-3346, 1987.

17.       Capon B.; Guo, B.; Kwok, F.C.; Siddhanta, A.K. and Zucco, C.,  "The Generation of  Simple Enols in Solution". Acc. Chem. Res. 21: 135-140, 1988 [IF 16.214].

18.       Siddhanta*,  A.K.;  Ramavat,  B.K.; Chauhan, V.D.; Achari, B.; Dutta, P.K. and Pakrashi, S.C., "Sulphonoglycolipid from the Green  Alga  Enteromorpha flexuosa (Wulf.) J.Ag." Botanica  Marina 34 (4): 365-367, 1991.

19.       Sen, A.K. Sr., Das, A.K., Banerji, N., Siddhanta*, A.K., Mody, K.H., Ramavat, B.K.,     Chauhan, V.D., Vedasiromoni, J.R. and Ganguly, D.K., " A new sulphated polysaccharide with potent blood-anticoagulant activity from the red seaweed Grateloupia indica".  Int.J.Biol. Macromol., 16(5): 279-280, 1994.

   20.       Siddhanta*, A.K.; Mody, K.H.; Ramavat, B.K.; Chauhan, V.D.; Garg, H.S.;  and  Sharma,  M., "Characterization of Sulphonoglycolipid from the Red Alga Laurencia  pedicularioides".  Botanica Marina 38:329-331, 1995.    

   21.       Siddhanta*, A.K., Mody, K.H., Ramavat, B.K., Chauhan, V.D., Garg, H.S., Goel, A.K., Jinandra Doss, M., Srivastava, M.N., Patnaik, G.K. and Kamboj, V.P., Bioactivity of marine organisms: Part VIII - Screening of some marine flora of western coast of India.  Indian Journal of Experimental Biology 35:638-643, 1997.

   22.       Siddhanta*, A.K., Shanmugam, M., Ramavat, B.K. and Mody, K.H., Agar from Gracilaria dura of the west coast of India.  Seaweed Research and Utilisation  19 (1&2):95-99, 1997.

   23.       Siddhanta*, A.K.,  A.M. Goswami, M. Shanmugam, K.H. Mody, B.K. Ramavat and O.P. Mairh.   Studies on sulphated polysaccharides of Laurencia species of the west coast of India,   In : Recent Trends in Algal Research (Ed. G.  Subba Rangaiah); Department of Botany, Andhra University, Visakhapatnam, Andhra University Publications;  pp.  91-98; 1999.

   24.       Mody, K.H., Sai Krishnamurthy, A., Siddhanta*, A.K., Ramavat, B.K. and Mairh, O.P., Investigation on the sulphated polysaccharides of Sargassum cinctum of Saurashtra coast, In : Recent Trends in Algal Research (Ed. G.  Subba Rangaiah); Department of Botany, Andhra University, Visakhapatnam, Andhra University Publications;  pp.  83-90; 1999. 

25.       Siddhanta*, A.K., Shanmugam, M., Mody, K.H., Goswami, A.M. and Ramavat, B.K. Sulphated polysaccharides of Codium dwarkense Boergs.  from the west coast of India : Chemical composition and blood anticoagulant activity.  International  J.  Biol.  Macromol. 26:151-154, 1999.

26.       Shanmugam, M., Mody, K. H. and Siddhanta*, A. K.. Blood anticoagulant sulphated polysaccharides of the marine green algae Codium dwarkense (Boergs.) and C. tomentosum (Huds.) Stackh. Indian Journal of Experimental Biology  39:365-370, 2001.

27.       Siddhanta*, A.K., Goswami, A.M., Ramavat, B.K., Mody, K.H. & Mairh, O.P.  Water soluble polysaccharides of marine algal species  Ulva (Ulvales, Chlorophyta) of Indian waters. Indian Journal of Marine Sciences  30 :166-172, 2001.

28.       Shanmugam, M., Mody, K.H. Ramavat, B.K., Sai Krishna Murthy, A. and Siddhanta*, A.K. Screening of Codiacean algae (Chlorophyta) of the Indian coasts for blood anticoagulant activity. Indian Journal of Marine Sciences 31:33-38, 2002. 

29.       Siddhanta*, A.K., Shanmugam, M., Goswami, A. M., Mody, K.H. and Ramavat, B.K. Sterols from marine green algae of Indian waters.  Journal of Indian Chemical Society  79 : 294-297, 2002. 

30.       Siddhanta*, A.K., Goswami, A. M., Shanmugam, M., Mody, K. H., Ramavat, B. K. and Mairh, O. P.  Sulphated galactans of marine red alga Laurencia  spp.     (Rhodomelaceae, Rhodophyta) from the west coast of India.  Indian Journal of Marine Sciences  31 (4) : 305-309, 2002.

31.       Siddhanta*, A.K.,  Goswami, A. M., Ramavat, B. K. and Achari, B. Nitrogenous glycerolipids from Ulva fasciata (Ulvaceae, Chlorophyta) of West Coast of India. J Indian Chem Soc  79: 843-845, 2002.

32.       Shahi, V.K*., Thampy, S.K.,  Siddhanta, A.K. and Rangarajan, R.  Separation of sodium sulfate and p-toluene sulfonic acid by electrodialysis. Separation Science and  Technology  37(14) : 3273-3289, 2002.

33.       A K  Sen, Sr.*, A K  Das, K K  Sarkar, A K  Siddhanta, R  Takano, K  Kamei and S Hara.  An agaroid-carrageenan hybrid type backbone structure for the antithrombic sulfated polysaccharide from Grateloupia indica Boergensen (Halymeniales, Rhodophyta).  Botanica Marina 45 :331-338, 2002 [IF 0.976].

34.       CRK  Reddy*, G  Raja Krishna Kumar, K  Eswaran, A K  Siddhanta and A Tewari.   In vitro somatic embryogenesis and regeneration of somatic embryos from pigmented callus of Kappaphycus alvarezii (Doty) Doty  (Rhodophyta, Gigartinales)".  Journal of Phycology  39 (3) :610-616, 2003. 

35.       Kamalesh Prasad, A. K.  Siddhanta*, A. K.  Rakshit, Amit Bhattacharya and Pushpito K. Ghosh*.  On the properties of agar gel containing ionic and non-ionic surfactants.  International Journal of Biological Macromolecules 35:135-144, 2005  [IF 1.578].

36.       Kamalesh Prasad, Keyur Trivedi, Ramavatar Meena, A. K. Siddhanta*.  Physical modification of agar: Formation of agar-fatty acid complex.  Polymer Journal  37(11): 826-832, 2005 [IF 1.421].

37.        K. Prasad, K. Trivedi, A. K. Siddhanta and A. Bhattacharya. Surface tension studies of polymer-surfactant solutions: I.  Agar-CTAB. Indian J Chem  44A:2445-2449, 2005.

38.       Kamalesh Prasad, Ramavatar Meena and  A.K Siddhanta*.  Microwave induced             rapid one-pot synthesis of k-carrageenan-g-PMMA copolymer by potassium persulphate initiating system.  J Appl Polymer Science 101:161-166, 2006  [IF 1.008].

39.      Meena R., Prasad, K. and Siddhanta*, A.K.  2006. Studies on "sugar reactivity" of agars extracted from some Indian agarophytes. Food Hydrocolloids 20:1206-1215, 2006 [IF 2.492].

40.      Kamalesh Prasad, Gaurav Mehta, Ramavatar Meena, A.K. Siddhanta*.  Hydrogel forming agar-graft-PVP and k-carrageenan-graft-PVP blends: Rapid synthesis and characterization. J Appl Polymer Science 102:3654-3663, 2006 [IF 1.008].

41.       Prasad, Kamalesh, Goswami, A.M, Meena, Ramavatar, Ramavat, B.K., Ghosh, Pushpito K. and Siddhanta*, A.K.  Superior quality agar from Gelidiella acerosa (Forsskal) J. Feldmann & G. Hamel (Rhodophyta, Gelidiales) of the west coast of India: An evaluation. Ind J Mar Sci  35:268-274, 2006 [IF 0.302].

42.       Meena, Ramavatar, Prasad, Kamalesh, Mehta, Gaurav and Siddhanta*, A. K. Synthesis of the copolymer hydrogel k-carrageenan-graft-PAAm : Evaluation of its absorbent and adhesive properties.  J Appl Polymer Science  102, 5144-5152, 2006 [IF 1.008].

43.       Ramavatar Meena, Kamalesh Prasad, A. K. Siddhanta*. Preparation of genipin-fixed agarose hydrogel. J Applied Polymer Science 104:290-296, 2007 [IF 1.008].

44.       Kamalesh Prasad, A K  Siddhanta*, M Ganesan, B K  Ramavat, B. Jha and P K  Ghosh. Agars of Gelidiella acerosa (Forsskal) J. Feldmann & G. Hamel (Rhodophyta, Gelidiales) of west and southeast coasts of India. Bioresource Technology 98:1907-1915, 2007 [doi:10.1016/j.biortech.2006.07.028] [IF 3.103].

45.       Ramavatar Meena, A.K. Siddhanta*, Kamalesh Prasad, B. K. Ramavat, K. Eswaran, S. Thiruppathi, M. Ganesan, Vaibhav A. Mantri and P V Subba Rao.  Preparation, characterization and benchmarking of agarose from Gracilaria dura of Indian waters.  Carbohydrate Polymers 69:179-188, 2007  [30-3-2007;  doi:10.1016/j.carbpol.2006.09.020] [IF 1.782].

46.       Ramavatar Meena, Kamalesh Prasad, A. K. Siddhanta*.  Effect of genipin, a naturally occurring crosslinker on the properties of kappa-carrageenan. Int J of Biological Macromolecules 41(1):94-101, 2007 [doi:10.1016/j.ijbiomac.2007.01.008] [IF 1.578].

47.       S. Santinath Singh, A. K. Siddhanta, Ramavatar Meena, Kamalesh Prasad, S. Bandyopadhyay and H. B. Bohidar*.  Intermolecular Complexation and Phase Separation in Aqueous Solutions of Oppositely Charged Biopolymers.  Int J Biological Macromolecules 41:185-192, 2007 [doi: 10.1016/j.ijbiomac.2007.02.004] [IF 1.578].

48.       Ramavatar Meena, Kamalesh Prasad, Mahesh Chhatbar, A K Siddhanta*. Development of a robust hydrogel system based on agar and sodium alginate blend.  Polymer International  57: 329-336, 2008.

49.       Ramavatar Meena, Kamalesh Prasad, M Ganesan and A K Siddhanta*. Superior quality agar from Gracilaria species (Gracilariales, Rhodophyta) collected from Gulf of Mannar, India.  J Appl Phycol  20:397-402, 2008   [DOI 10.1007/s10811-007-9272-6] [IF 0.788].

50.       Kamalesh Prasad*, Ramavatar Meena, A K Siddhanta*. A new approach to functionalize agar and κ-carrageenan based thin films with improved barrier properties.   J Polymer Materials  25 (3):373-380, 2008 [IF 0.373].

51. Kamalesh Prasad*, P Bahadur, Ramavatar Meena and A K Siddhanta.  Facile             solvent free synthesis of polymerised sucrose functionalised polyoxyethylene            (23) lauryl ether by microwave irradiation.  Green Chemistry; 10:1288-1293,             2008 [DOI:10.1039/b810514f] [IF 4.836].

52.       Ramavatar Meena, Kamalesh Prasad, A K Siddhanta*. Development of a stable hydrogelnetwork based on agar-kappa-carrageenan  blend cross-linked with genipin. Food Hydrocolloids 23 (2): 497-509, 2009 (Published online; March 25, 2008) [doi:10.1016/j.foodhyd.2008.03.008] [IF 2.492].

53.       Mahesh Chhatbar, Ramavatar Meena*, Kamalesh Prasad and A K Siddhanta*. Microwave assisted rapid method for hydrolysis of sodium alginate for M/G ratio determination. Carbohydrate Polymers 76: 650-656, 2009 [doi:10.1016/j.carbpol.2008.11.033] [IF 2.64].

54.       Gayatri Prasad, Kamalesh Prasad, Ramavatar Meena and A K Siddhanta*. Facile preparation of Chaetomorpha antennina based porous polysaccharide-PMMA hybrid material by radical polymerization under microwave irradiation. J Materials Science 44(15): 4062-4068, 2009 (Online June 15, 2009; DOI: 10.1007/s10853-009-3586-5) [IF 1.081].

            55.       Mahesh U Chhatbar, Ramavatar Meena, Kamalesh Prasad and A.K. Siddhanta*. Agar/sodium alginate-graft-polyacrylonitrile, a stable hydrogel system.  Indian J Chem 48A:1085-1090, 2009  [IF=0.60].

56.       A K Siddhanta*, Kamalesh Prasad; Ramavatar Meena; Gayatri Prasad; Gaurav K Mehta; Mahesh  U Chhatbar; Mihir D Oza; Sanjay Kumar; Naresh Sanandiya.  Profiling of cellulose content in Indian seaweed species. Bioresource Technology 100: 6669-6673, 2009  [doi:10.1016/j.biortech.2009.07.047] [IF=4.5].

57.       Gaurav K Mehta,   Ramavatar Meena,  Kamalesh Prasad,  M Ganesan,   A K Siddhanta*. Preparation of galactans from Gracilaria debilis and Gracilaria salicornia (Gracilariales, Rhodophyta) of Indian waters. J Appl Phycol (In press; January 4, 2010; DOI: 10.1007/s10811-010-9502-1) [IF=1.2]. 

Book Chapters

1. Siddhanta, A.K.*, Meena, R., Prasad, G., Chhatbar, M.U., Mehta, G.K., Oza, M.D., Kumar, S., Prasad, K. Development of carbohydrate polymer based new hydrogel materials derived from       seaweed polysaccharides 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, April 2009  (In press).

2.   Ramavatar Meena and A K Siddhanta*. 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.172-184, CSMCRI Bhavnagar.

3.   A K Siddhanta*, Ramavatar Meena, Kamalesh Prasad and A Sai Krishna Murthy.  Seaweed       polysaccharides, their bioactivity and value addition – the Indian perspective. 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.

Review Articles 

1.         Siddhanta, A K.  Chemical investigation and value addition of seaweeds. Indian Hydrobiology7 (Supplement):29-34; July 2005.

2.         Siddhanta*, A.K., Goswami, A.M. and Sai Krishna Murthy, A.  Bioactive             compounds       from marine algae.  Drugs and Pharmaceuticals: Current R&D            Highlights 23: 21-25,     2000 (Publisher : NICDP, CDRI, Lucknow; published in  April 2001).

3.         Siddhanta*, A.K. and Sai Krishna Murthy, A.  Bioactive polysaccharides from marine brown algae (Phaeophyceae). Journal of Indian Chemical Society  78:431-437, 2001.       

4.         Siddhanta*, A.K. and M. Shanmugam,  Metabolites of Tropical Marine Algae of the Family Codiaceae (Chlorophyta) : Chemistry and Bioactivity.  Journal of Ind. Chem. Soc. 76 : 323-334; 1999.

5.         Siddhanta*, A.K.;  Ramavat, B.K.; Mody, K. and Chauhan, V.D.,  "Biomedical Potential  of  Marine Algae".  Seaweed Research and Utilization 15 (1&2): 149-157, 1992.

General Articles

1.         Chauhan, V.D.; Siddhanta*, A.K., "Samudri Shabaal Ke Ousodhiya Upyoga  (Medicinal  Application of Marine Algae)".  In: Samudri Sansadhano Se  Ousodhiyaa (Drugs from  the   Sea).  Eds.  S.A.H.Abidi,  B.N.Dhawan,  H.S.Garg,  G.Mantri, K.R. Sharma).Mahasagar Vikas Vibhag, Bharat Sarkar (Department of Ocean Development,Government of India), New Delhi, 1992, p. 49-54.

2.         Siddhanta*, A.K., Mody, K.H., Ramavat, B.K. and Chauhan, V.D.,  "Bharatiya Samudri  Shaibaal se Upalabddha Jaibasakriya Yogikon  ka Addhayana ( Studies on the bioactive  compounds of  Indian marine algae)". In: Mahasagariya Sansadhana (Investigation on  Ocean) (Eds. S.A.H. Abidi,  J.B.R. Prasadrao, B.N. Dhawan, P. Natarajan, R.N. Vohra,  Ms. Rakesh Sharma). Mahasagar Vikas Vibhag, Bharat Sarkar (Department of Ocean   Development, Government of India), New Delhi, p.217-224, 1994.

3.         Natarajan, P. and Siddhanta*, A. K., Marine algae - Their chemistry and utilization.  In:Souvenir of published by the Seaweed Research and Utilization Association on the occasion of the Silver Jubilee Celebrations during  September 2-6, 1994; pp.34-36.

4.         Siddhanta*, A.K., Marine algal polysaccharides - Functions and utilisation.  In : Trends in Carbohydrate Chemistry (Ed. P.L. Soni).  (IX Carbohydrate Conference, Lucknow, November 24-26, 1993).  Surya International Publications, Dehra Dun - 248 001 (India), 1995;  pp. 125-131.

   5.         Siddhanta*, A.K., Mairh, O.P. and Natarajan, P., Value added marine flora, In:Chemistry and Biology of Herbal Medicine (Eds. V P  Agrawal and V P  Kamboj).  Society of Biosciences, Muzaffarnagar, India, 1997;  pp. 163-174.


1.         Falck J R, Schueler V J, Jacobson H R, Siddhanta A K, Pramanik B, Capdevila J.  Detection of 8,9-Epoxyeicosatrienoic and 14,15-Epoxyeicosatrienoic Acids as Endogenous Components of Rabbit Kidney.  Kidney International   31(1): 269-269, Jan 1987.

2.         Toto R D, Falck J R, Siddhanta A K, Capdevila J. Epoxyeicosatrienoic Acids (EETs) In Human-Urine (Hu) - Detection Of 8,9-Regioisomers And 14,15-Regioisomers.  Kidney International   31(1): 289-289, Jan 1987.