Jefferson Vladimir Pastuña

Mr. Jefferson Vladimir Pastuña

orcid

Research Focus & Metrics

Academic Career Length

2Years (2025-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 March 2025 in Molecules
Verified
Journal Article
Open access
PDF file
MOMelanie Ashley Ochoa
Melanie Ashley Ochoa
NMNina Q. Espinosa de los Monteros-Silva
Nina Q. Espinosa de los Monteros-Silva
JPJefferson Vladimir Pastuña
Jefferson Vladimir Pastuña
JSJuan Diego Sacoto-Torres
Juan Diego Sacoto-Torres
MMMaria Cristina Peñuela Mora
Maria Cristina Peñuela Mora
NMNoroska Gabriela Mogollón
Noroska Gabriela Mogollón
Antioxidants are essential compounds with diverse applications, and medicinal plants are a natural source of these biomolecules. Philodendron heleniae, a species native to the Ecuadorian Amazon, belongs to a genus renowned for its traditional therapeutic uses. Extracts from the stems and roots of several Philodendron species have been widely used to treat stress, bladder disorders, and snakebite wounds, underscoring their medicinal potential. This study investigates the volatile composition, antioxidant properties, and molecular docking of ethanolic extracts from P. heleniae, aiming to expand its applications. Phytochemical analysis revealed a rich profile of tannins, phenolic compounds, flavonoids, and terpenoids. Antioxidant assays (ABTS and DPPH) demonstrated the extract’s strong free radical scavenging capacity, comparable to the standard Trolox. GC-MS analysis identified 48 volatile and semi-volatile metabolites, predominantly phenolic compounds, terpenoids, and lipid-like molecules. Fractionation of the crude ethanolic extract into aqueous and ethanolic fractions simplifies the downstream analytical steps and facilitates the identification and the evaluation of the higher abundance of antioxidant-related metabolites. Molecular docking supported these findings, highlighting strong binding affinities of stigmasterol and desmosterol to catalase, an enzyme critical for reducing oxidative stress. These results position P. heleniae as a promising source of natural antioxidants with potential pharmaceutical applications, while emphasizing the importance of conserving Ecuador’s biodiversity and its bioactive resources.

26 June 2025 in Molecules
Verified
Journal Article
Open access
PDF file
LMLizbeth Carolina Zamora Mendoza
Lizbeth Carolina Zamora Mendoza
JCJhonny Israel Caicho
Jhonny Israel Caicho
JMJose R Mora
Jose R Mora
DNDaniela Alejandra Negrete
Daniela Alejandra Negrete
Victor H. GuerreroVictor H. Guerrero
Victor H. Guerrero
Frank AlexisFrank Alexis
Frank Alexis
The increasing demand for sustainable and environmentally friendly materials has prompted intensive research into developing bioplastics as viable alternatives to conventional petroleum-derived plastics. Here, we report a novel approach to bioplastic production by employing plant extract-based solvents to partially dissolve cellulose, a fundamental biopolymer precursor. Using plant-derived solvents addresses concerns surrounding the environmental impact of traditional solvent-based processes, as per the principles of green chemistry. Using computational screening, some natural products were identified from the integrated database resource MEGx. Six natural sources were selected based on their molecular weight, high pKa, and chemical classification. Thin-layer chromatography (TLC) and column chromatography confirmed the presence of molecules in the extracts. Bioplastics were prepared with 1, 3, 6, 10, and 15 wt.% plant extract concentrations. Control samples without conventional dissolved and positive controls were also studied to compare their properties with novel bioplastics. Chemical characterization and biodegradability tests were performed. Degradation in water and soil tests for 35 days showed that the biodegradability of the bioplastics with natural extracts at higher concentrations was faster than that of the control samples. By day 35, bioplastics containing 15 wt.% of the D1 W extract showed rapid degradation, with higher weight loss compared with the conventional controls. The positive control (C4), containing NaOH and glycerol, degraded more slowly than the plant extract-based formulations. Also, the test indicated that the natural dissolvent’s influence on the water uptake of the material produced a better performance than the control samples. The surfaces of the bioplastic formulations were analyzed using a scanning electron microscope (SEM) at different magnifications. The findings presented here hold promise for advancing the field of bioplastics and contributing to the sustainable utilization of plant resources for eco-friendly material production.

22 January 2026 in Journal of Chromatography A
Verified
Journal Article
Closed access
TGThomas Garzón
Thomas Garzón
JPJefferson Vladimir Pastuña
Jefferson Vladimir Pastuña
CQCristian Quiroz-Moreno
Cristian Quiroz-Moreno
MOMelanie Ochoa-Ocampo
Melanie Ochoa-Ocampo
EMEvencio J. Medina-Villamizar
Evencio J. Medina-Villamizar
NMNoroska Gabriela Mogollón
Noroska Gabriela Mogollón

16 May 2026 in Microbial Pathogenesis
Verified
Journal Article
Closed access
RPRicardo Palma
Ricardo Palma
NMNina Q. Espinosa de los Monteros-Silva
Nina Q. Espinosa de los Monteros-Silva
EMEmilie G. Moreira
Emilie G. Moreira
JPJefferson Vladimir Pastuña
Jefferson Vladimir Pastuña
TGThomás Matheo Garzón
Thomás Matheo Garzón
NMNoroska Gabriela Mogollón
Noroska Gabriela Mogollón