Publications by authors named "Maria D Gonzalez-Hernandez"
Article Synopsis
- - The study investigates how different extraction methods (Soxhlet, maceration, ultrasound-assisted) influence the phytochemical profile and antioxidant activity of guava leaf extracts, which are rich in polyphenolic compounds.
- - The extraction yield of phenolic compounds ranged from 16 to 45 mg/g, with the Soxhlet method producing the strongest antioxidant effects based on various assays (ABTS, FRAP, Folin-Ciocalteu).
- - Key bioactive compounds such as quercetin, kaempferol, and avicularin were identified, highlighting that both the method of extraction and purification significantly enhance the antioxidant capacity of guava leaf extracts.
A comparative study was carried out on the chemical, structural and thermal properties of candelilla wax from four wax-producing communities in Mexico, which was obtained by two extraction processes, the conventional one using sulfuric acid (SA) and an eco-friendly alternative process using citric acid (CA) as the extracting agent. The waxes were analyzed by basic chemistry (acidity, saponification, ester indexes, and others), color, Fourier transform infrared spectroscopy (FTIR), Raman micro-spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and hardness and brittleness measurements. The waxes obtained by the environmentally friendly process showed differences in their physicochemical properties when compared to waxes from the conventional process.
View Article and Find Full Text PDF(avocado) is a fruit consumed worldwide; however, since avocado leaves are apparently a natural ingredient that can be used as a traditional medicine, they can be a potential source of bioactive compounds. This study aimed to analyze the antioxidant activity of seven Mexican avocado leaf extracts by DPPH, ABTS, and lipid peroxidation (LPO), and to identify the compound profile by liquid chromatography coupled to mass spectrometry/electron spray ionization. The highest free radical-scavenging activity was observed for Platano Delgado and Criollo 6 avocado cultivars havin IC values of 271.
View Article and Find Full Text PDFArticle Synopsis
- This study explored how different extraction methods (maceration, decoction, MAE, and UAE) affect total phenolic content (TPC) and antioxidant activity in various plant extracts including Punica granatum, Juglans regia, Moringa oleifera, and Cassia fistula.
- Results indicated that MAE consistently yielded the highest TPC values across all samples, showcasing its effectiveness in extracting potent antioxidants.
- LC-MS analysis revealed a diverse range of phenolic compounds, confirming that the choice of extraction method significantly influences the phytochemical profile of the plants.