scholarly journals HPLC-DAD-ESI/MS Identification and Quantification of Phenolic Compounds in Ilex paraguariensis Beverages and On-Line Evaluation of Individual Antioxidant Activity

Molecules ◽  
2013 ◽  
Vol 18 (4) ◽  
pp. 3859-3871 ◽  
Author(s):  
Renato Peres ◽  
Fernando Tonin ◽  
Marina Tavares ◽  
Delia Rodriguez-Amaya
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Ilex Paraguariensis ◽  
Esi Ms ◽  
On Line ◽  
Identification And Quantification

Vegetative propagation, chemical composition and antioxidant activity of yerba mate genotypes

2021 ◽  
pp. 1-10
Author(s):  
Leandro Marcolino Vieira ◽  
Renata de Almeida Maggioni ◽  
Jéssica de Cássia Tomasi ◽  
Erik Nunes Gomes ◽  
Ivar Wendling ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Vegetative Propagation ◽  
Adventitious Rooting ◽  
Ilex Paraguariensis ◽  
Total Phenolic ◽  
Yerba Mate ◽  
Total Phenolic Compounds ◽  
Leaf Retention ◽  
Correlated Components

Abstract Ilex paraguariensis, commonly known as yerba mate, is a tree species native to South America. Its commercial value is due to the manufacturing of teas, with potential also in the pharmacological and cosmetic industries. Vegetative propagation of yerba mate is considered an innovation to the traditional production systems based on sexual propagation. The present study aimed to evaluate the rhizogenic potential and chemical attributes of mini-cuttings from 15 yerba mate genotypes, as well as to verify the correlation between phytochemical and rooting-related variables. Mini-cuttings were collected from a pre-existing mini-clonal hedge and the experimental design was completely randomized, with 15 treatments (genotypes), four replications and 10 mini-cuttings per plot. After 120 days, mini-cuttings were assessed regarding rooting, mortality, callogenesis and leaf retention percentages, percentage of mini-cuttings with both calluses and roots, number of roots and average root length. At the time of collection, subsamples from each plot were used for phytochemical analyses including total phenolic compounds, protein, caffeine and theobromine contents and antioxidant activity. Rooting percentages ranged from 5 to 72.5%, with significant variation among genotypes. Adventitious rooting and phytochemical profile of yerba mate mini-cuttings are genotype-dependent. Leaf retention is a relevant factor in the rooting of yerba mate mini-cuttings and the levels of total phenolic compounds, antioxidants and theobromine present in mini-cuttings are negatively correlated components to Ilex paraguariensis adventitious rooting.

scholarly journals Extruded corn gruels containing linden flowers: quantitation of phenolic compounds and selected quality characteristics

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Anna Oniszczuk ◽  
Agnieszka Wójtowicz ◽  
Tomasz Oniszczuk ◽  
Marta Olech ◽  
Renata Nowak ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
High Temperature ◽  
Phenolic Compounds ◽  
Phenolic Content ◽  
Quality Characteristics ◽  
Sensory Properties ◽  
Extrusion Cooking ◽  
Plant Materials ◽  
Esi Ms ◽  
Improve Health

AbstractExtrusion-cooking of plant materials may enhance antioxidant activity and improve health benefits. Selected antioxidant polyphenols in extruded corn gruels enriched with different amounts of linden flowers were determined by LC-ESI-MS/MS and quality characteristics were determined.Phenolic content increased with Tiliae inflorescentia addition and was not decreased by high-temperature extrusion. Linden flower incorporation into instant gruels should be limited to 10% to retain acceptable sensory properties.

scholarly journals Antioxidant Capacity and UPLC-PDA ESI-MS Phenolic Profile of Stevia rebaudiana Dry Powder Extracts Obtained by Ultrasound Assisted Extraction

Agronomy ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 170 ◽  
Author(s):  
Ana Covarrubias-Cárdenas ◽  
José Martínez-Castillo ◽  
Nelly Medina-Torres ◽  
Teresa Ayora-Talavera ◽  
Hugo Espinosa-Andrews ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Liquid Chromatography ◽  
Phenolic Compounds ◽  
Ultra Performance Liquid Chromatography ◽  
Steviol Glycosides ◽  
Fragmentation Pattern ◽  
Ultrasound Assisted Extraction ◽  
Esi Ms ◽  
Assisted Extraction ◽  
Ultrasound Assisted

Stevia leaves, which are commonly used as a natural sweetener in food products, have increased in importance for antioxidant delivery due to their high content of phenolic compounds. In this study, the influence of the drying process on stevia leaves, with regards to phenolic content and antioxidant activity during drying kinetics 40 °C for 7 h, was studied. The effect of solvent concentration and extraction time using a 32 factorial design on total phenol content (TPC), and on antioxidant activity of extracts obtained from dried stevia leaves, by ultrasound assisted extraction (UAE) as alternative method was evaluated. Steviol glycosides contents were also evaluated by a conventional and UAE method. Phenols identification, quantification and purification were performed by Ultra Performance Liquid Chromatography-Electrospray Ionization-Mass Spectrometry (UPLC-ESI-MS), Ultra Performance Liquid Chromatography-Photodiode Array (UPLC-PDA) and advanced automated flash purification, respectively. Drying time affected the moisture content of stevia leaves. A constant weight was reached after six hours of drying, and higher antioxidant activity was observed, while the highest TPC was obtained after seven hours of drying. The highest TPC (91.57 ± 8.8 mg GAE/g dw) and antioxidant activity (603.24 ± 3.5 μmol TE/g dw) in UAE method was obtained when ethanol 50% at 5 min was used. Steviol glycosides extracted by UAE were recorded with a content of 93.18 ± 1.36 mg/g dw and 98.97 ± 1.75 mg/g dw for stevioside and rebaudioside A respectively. Six phenolic compounds including four phenolic acids and two flavonoids were identified and quantified by UPLC-PDA, and confirmed by ESI-MS reporting its fragmentation pattern. Diosmin and chlorogenic acid were the most abundant compounds with values of 2032.36 μg/mL and 434.95 μg/mL respectively. As a novelty we found that the antioxidant activity evaluated in partially purified fractions suggested that biological activity might be attributed to the synergistic effect of the six phenols present in the stevia leaves extract. In addition to its sweeting properties, stevia leaves constitute a potential source of polyphenolic compounds, with antioxidant activity that could be used as a food additive.

Determination of antioxidant activity and phenolic compounds ofMuntingia calaburaLinn. peel by HPLC-DAD and UPLC-ESI-MS/MS

2017 ◽  
Vol 52 (4) ◽  
pp. 954-963 ◽  
Author(s):  
Eliza Mariane Rotta ◽  
Charles Windson Isidoro Haminiuk ◽  
Liane Maldaner ◽  
Jesuí Vergilio Visentainer
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Esi Ms
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