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Hire Dr. Cristóbal L.

Venezuela

USD 100 /hr

35years Chemistry Professor Polymer&Natural Products 30 under&postgraduate Theses ChiefEditor Journal Avances en Química

Profile Summary

I currently work at the Polymer Group, Department of Chemistry, University of the Andes-Venezuela. I do research in Chitosan, Hydrogels, Unsaturated Polyesters, Green Chemistry, Adding value to unknown and/or waste materials. I also founder of the Journal Avances en Química and currently its Chief E​d​i​t​. My most recent publications are: - C Lárez Velásquez, G, I Santos-Ocanto. Separation and Characterization of Water Soluble Protein Fraction from Moringa oleifera Seeds. J. Progres. Res. Mod. Phys. Chem., 3(1), 85-96 (2018) - C Lárez-Velásquez. Chitosan-based nanomaterials on controlled bioactive agents delivery: a review. J. Anal. Pharm. Res., 7(4), 484‒489 (2018). - JL Benítez, C Lárez Velásquez, C Urbina de Navarro, B Rojas de Gáscue. Efectos de la isomería configuracional sobre el hinchamiento de hidrogeles basados en acrilamida/anhídrido maleico. Avances en Química, 13(3), 61-67 (2018). - M Rojas-Pirela, L Ramírez, M Zambrano, MJ Peña-Vera, C Lárez-Velásquez, E Pérez-Pérez. Studies of Resistance to Multiple Antimicrobial Compounds and Salt Tolerance of Strains Isolated from Patients with Chronic Sinusitis. CPQ Medicine, 7(2), 01-08 (2019). - M Rojas-Pirela, M Peña, MJ Peña-Vera, M Sulbarán, E Pérez, C Lárez-Velásquez. Characterization and determination of antimicrobial and metal resistant profles of Xanthomonas strains isolated from natural environments. J. Anal. Pharm. Res., 8(2), 55‒60 (2019). - C Lárez-Velásquez, M Rojas Pirela, A Chirinos, L Rojas-Avelizapa. Nuevos retos en agricultura para lós biopolímeros de quitina y quitosano. Parte 1: Efectos beneficiosos para lós cultivos. Rev. Iberoam. Polímeros y Materiales, 20(3), 118–136 (2019). - C Lárez-Velásquez, M Rojas Pirela. Los quitosanos y La lucha contra lós coronavirus. Avances en Química, 15(1), 23-34 (2020). - C Lárez-Velásquez. On the Consequences of Having Omnipotent National Presidents Who Do Not Heed Teir Expert´s Advices and Other Lessons From a Pandemic. CPQ Medicine, 9(1), 01-06 (2019). - C Lárez-Velásquez, L Rojas-Avelizapa. A Review on the Physicochemical and Biological Aspects of the Chitosan Antifungal Activity in Agricultural Applications. Journal of Research Update on Polymer Science (2020) …

Subject Matter Expertise

• ★ Polymer Chemistry
• ☆ Materials Science & Engineering
• ☆ Nanotechnology & Nanomaterials
• ☆ Biopolymers
• ☆ Agricultural Biotechnology

Services

• Writing
• Research
• Consulting
• Product Development

Writing Technical Writing, Copywriting

Research Fact Checking, Gray Literature Search, Systematic Literature Review, Secondary Data Collection

Consulting Scientific and Technical Consulting

Product Development Formulation

Work Experience

Professor

Universidad de los Andes, Mérida, Venezuela

May 1987 - Present

Education

Doctor en Química Aplicada

Universidad De Los Andes

April 1993 - December 1999

Licenciado en Química

Universidad De Los Andes

January 1979 - December 1997

M. Sc. en Química Aplicada

Universidad De Los Andes

September 1989 - September 1991

Bachiller en Ciencias

Liceo Tavera Acosta

1976 - 1978

Liceo JM Siso Martínez

September 1973 - July 1976

Escuela primaria Iron Mines No. 2

September 1967 - July 1973

Certifications

• Sistema Promoción de la Investigación Nivel C

  Ministerio de Ciencia y Tecnología, Venezuela

  January 2016 - December 2018

Publications

JOURNAL ARTICLE

Velásquez, C.L., Ramírez, M., Millán, E., Medina, A.(2012). Swelling studies and adsorption of safranin T by acrylamide/maleic acid/methylene-bis-acrylamide based hydrogels . E-Polymers.

Velásquez, C.L., Díaz, L.Z.(2011). Chitosan depolymerisation by potassium periodate | Despolimerización de quitosano con peryodato de potasio . Revista Latinoamericana de Metalurgia y Materiales. 31. (2). p. 195-202.

Lárez Velásquez, C.(2008). Some potentialities of chitin and chitosan for uses related to agriculture in Latin America | Algunas potencialidades de la quitina y el quitosano para usos relacionados con la agricultura en Latinoamérica . Revista Cientifica UDO Agricola. 8. (1). p. 1-22.

Lárez, C., Márquez, O.P., Márquez, J.(2006). Anodic oxidation and electropolimerization of salicylic acid | Oxidación anódica y electropolimerización del ácido salicílico . Revista Tecnica de la Facultad de Ingenieria Universidad del Zulia. 29. (1). p. 3-13.

Barrios, E.M., Mujica, G.A., Velásquez, C.L., Martínez, Y.(2006). Studies of the presence of dicarboxylic acids in the electrochemical synthesis of poly(aniline): Case poly(itaconic acid) . Journal of Electroanalytical Chemistry. 586. (1). p. 128-135.

Velásquez, C.L., Albornoz, J.S., Nava, J.U., Barrios, E.M., Velásquez, H.L.(2005). Conductimetric studies of chitosan in aqueous medium . Polymer Bulletin. 55. (3). p. 201-208.

Lárez V, C., Canción, F., Millán, E., Katime, I.(2002). Interpolymeric complexes of poly(itaconic acid) and chitosan . Polymer Bulletin. 48. (4-5). p. 361-366.

Lárez-V, C., Crescenzi, V., Ciferri, A.(1995). Phase Separation of Rigid Polymers in Poor Solvents. 1. (Hydroxypropyl)cellulose in Water . Macromolecules. 28. (15). p. 5280-5284.

Làrez-V, C., Crescenzi, V., Dentini, M., Ciferri, A.(1995). Assemblies of amphiphilic compounds over rigid polymers: 2. Interaction of sodium dodecylbenzenesulfonate with chitosan-scleraldehyde gels . Supramolecular Science. 2. (3-4). p. 141-147.

Larez, Cristobal, Marquez, Jairo, Perdomo, Gilberto, Marquez, Olga P.(1992). Electrochemical polymerization of β-2-furylacrylic acid . New Polymeric Materials. 3. (3). p. 155-161.

Larez, V., Cristobal, J., Perdomo Mendoza, G.A.(1991). Unsaturated polyester - 4. Polyester from maleic anhydride and 1,5-pentanediol . Polymer Bulletin. 26. (3). p. 313-317.

Larez V., C.J., Mendoza, G.A.P.(1991). Unsaturated polyesters, III. Polyester from maleic anhydride and 1,4‐butylene glycol . Journal of Applied Polymer Science. 43. (9). p. 1605-1607.

Cristobal, L.V., Perdomo Mendoza, G.A.(1990). Unsaturated polyesters - 2. Polyester from maleic anhydride and 1,3-propylene glycol . Polymer Bulletin. 23. (6). p. 577-581.

Cristobal, L.V., Mendoza, G.A.P.(1989). Unsaturated polyesters - 1. Polyester from maleic anhydride and ethylene glycol . Polymer Bulletin. 22. (5-6). p. 513-519.

CONFERENCE PAPER

Cristobal, Larezv, Gilberto, Perdomo M.(1990). Polyesterification and cis-trans isomerization: A simultaneous study . Journal of Applied Polymer Science: Applied Polymer Symposium. (49). p. 59-66.