Estudio Teórico De La Actividad Antioxidante De Compuestos Aromáticos Con Bases De Schiff Heterocíclicas Sustituidos en Posiciones Meta Y Para

García, Williams Gilberto Jiménez; Lezama, Hélmer; Pumachagua, Rodolfo

doi:10.37761/rsqp.v85i2.81

Cited by 1 publication

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“…One of the characteristics of these compounds is their antioxidant activity or ability to counteract free radicals by chelating metal ions that are involved in their production. In addition, these compounds have ability to donate a hydrogen anion (an unpaired electron) and relocate it within the aromatic structure (García et al, 2019). Among polyphenols, flavonoids comprise some of the most important compounds.…”

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“…Los polifenoles cuentan con uno o más grupos fenoles al derivar de la fenilalanina u ácido benzoico (Mutha et al, 2021). Una de las características de estos compuestos es su propiedad antioxidante o capacidad para contrarrestar radicales libres, mediante quelado de iones de metales que intervienen en su producción, y a su capacidad para donar un anión de hidrógeno, un electrón no apareado, y reubicarlo dentro de la estructura aromática (García et al, 2019). Dentro de la clasificación de los polifenoles, destacan los flavonoides, los cuales se subdividen en Flavonoles, Flavonas, Catequinas, Flavanonas, Antocianidinas e Isoflavonas (Mutha et al, 2021).…”

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Polyphenols extraction from creosote bush, tarbush, and soursop using ultrasound-microwave and their effect against Alternaria alternata and Fusarium solani

Castillo¹,

León-Juárez²,

Nery‐Flores³

et al. 2022

RMF

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Crops are affected by different pathogens that cause damage to the plant and production losses. Quarantine restrictions may also occur due to the presence of a pathogen. In most cases, synthetic chemical products are used to control phytopathogens. However, some of these products have been associated with risks to human health or the environment. Therefore, it is necessary to search for more sustainable alternatives to control these pathogens. This research was carried out under the following objectives: 1. To extract polyphenols from Creosote bush, Tarbush and Soursop leaves using: different mass/volume ratios (m/v), different concentrations of ethanol, simultaneous ultrasound-microwave and 2. To determine the effect of these polyphenols against Fusarium solani and Alternaria alternata. Polyphenols were obtained from Creosote bush, Tarbush and Soursop leaves by combining ultrasound-microwave, and using different massvolume ratios and ethanol percentages. The group of polyphenols (CD) obtained with a mass/volume (m/v) ratio of 1:8 and 70% ethanol from Creosote bush leaves and the group of polyphenols (CA) obtained with a m/v ratio 1:16 and 70% ethanol from Tarbush leaves were the most effective against Fusarium solani, inhibiting 90.4 and 60.67%, respectively. For Alternaria alternata, no differences were found in the mycelial inhibition by the different groups of evaluated polyphenols, with inhibition values between 50-60% in comparison to the negative control (without polyphenols). In the profile of CD polyphenols group obtained from Creosote bush, different polyphenolic compounds reported to have antimicrobial activity were found, among which the following stand out: epirosmanol, rosmadiol, apigenin, catechin, and procyanidin C1. Polyphenolic compounds isolated from Creosote bush, Tarbush, and Soursop leaves using environmentally friendly methods (ultrasoundmicrowave) and solvents (water and ethanol) showed antifungal activity against F. solani and A. alternata.

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