Petroporphyrins are biomarkers derived from chlorophyll, bacteriochlorophyll and the heme group, commonly present in crude oils as vanadyl or nickel complexes. These compounds, which despite of the organic matter maturation process preserve the tetrapyrrolic core of their precurs...
Autor(es): Cristian Blanco. Marianny Yajaira Combariza.
Fique fibers are extracted from Furcraea spp. leaves, with 5% average mass yield, using mechanical decortication. Juice, pulp and tow, the by-products of this process, amount 95% of the leaf weight and are considered waste. We extracted cellulose nanofibrils (CNF) from Fique tow,...
Autor(es): Cristian Blanco. Marianny Yajaira Combariza.
As worldwide agricultural production rises, agro-industrial biomass becomes an abundant raw source for uses in energy and materials production. In Colombia fique plants (Furcraea spp.) are traditionally used to extract hard cellulosic fibers using mechanical decortication. Juice,...
Autor(es): Marianny Yajaira Combariza. Cristian Blanco.
Terthiophene and anthracene, both of which in positive mode form only molecular radical cations (M+?) upon laser irradiation (? = 337 nm) at near-threshold laser powers, were used as matrices for matrix-assisted laser desorption/electron-transfer ionization of metallocenes (1,2-d...
Autor(es): Marianny Yajaira Combariza.