Phytochemical profile, antioxidant properties and protein contents of Astragalus tenuifoliosus seeds
DOI:
https://doi.org/10.29356/jmcs.v67i1.1854Keywords:
Astragalus tenuifoliosus seeds, proteins, globulins, quinic acid, LC-ESI/MS.Abstract
Fabaceae seeds are reported to be used for varying medicinal and pharmaceutical purposes. However, knowledge of the nutritive value of Astragalus tenuifoliosus seeds is largely based on very limited data and remains unexplored, we report here the protein content, phenolics as well as the antioxidant potential of plant seeds to give adequate information on its suitability as a new source of natural bioactive compounds. The protein content was determined using the Kjeldahl and Bradford assays. The phytochemical contents were evaluated, and the extracts were further subjected to high-performance liquid chromatography-electrospray ionization – mass spectrometry (HPLC-ESI-MS) analysis. The antioxidant potential was evaluated using the total antioxidant capacity and the free DPPH radical scavenging activity. The results obtained from the protein analysis showed that the total content was 59.43 % of the dry matter basis. The globulins constituted the dominant fraction and followed by albumins, glutelins, and prolamins. The phytochemical investigation showed considerable amounts of polyphenol, flavonoid and condensed tannin amounts. The LC-ESI/MS analysis revealed the presence of 18 phenolics including 8 phenolic acids and 10 flavonoids mostly predominated by quinic acid (255.4 µg g-1 DW), p-coumaric acid (65.39 µg g-1 DW), quercetin (97.21 µg g-1 DW), and cirsiliol (29 µg g-1 DW). The seeds possessed strong antioxidant potential evidenced by their DPPH radical scavenging activities and total antioxidant capacity. The obtained findings contribute to the limited bibliographic information concerning A. tenuifoliosus seeds and represent a starting point to evaluate its potential as a valuable source of proteins, natural antioxidants, and safe bioactive compounds.
Resumen. Las semillas de las Fabaceae se utilizan para diversos fines medicinales y farmacéuticos. Sin embargo, el conocimiento del valor nutritivo de las semillas de Astragalus tenuifoliosus se basa en gran medida en datos muy limitados y sigue sin explorarse. Aquí se reporta el contenido de proteínas, fenoles y el potencial antioxidante de las semillas de plantas para brindar información adecuada sobre su idoneidad como nueva fuente de compuestos bioactivos naturales. El contenido de proteína se determinó utilizando los ensayos de Kjeldahl y Bradford. Se evaluaron los contenidos fitoquímicos y los extractos se sometieron a análisis de cromatografía líquida de alto rendimiento, ionización por electropulverización y espectrometría de masas (HPLC-ESI-MS). El potencial antioxidante se evaluó utilizando la capacidad antioxidante total y la actividad de captación de radicales libres DPPH. Los resultados obtenidos del análisis de proteína mostraron que el contenido total fue de 59.43% con base en el peso seco. Las globulinas constituyeron la fracción dominante, seguidas por las albúminas, las glutelinas y las prolaminas. La investigación fitoquímica mostró cantidades considerables de polifenoles, flavonoides y taninos condensados. El análisis medinate LC-ESI/MS reveló la presencia de 18 fenoles, incluidos 7 ácidos fenólicos y 11 flavonoides, predominando en su mayoría el ácido quínico (255.4 µg g-1 DW), el ácido p-cumárico (65.39 µg g-1 DW), la quercetina (97.21 µg g-1 DW), y el cirsiliol (29 µg g-1 DW). Las semillas poseen un fuerte potencial antioxidante, evidenciado por sus actividades de eliminación de radicales DPPH y su capacidad antioxidante total. Los hallazgos obtenidos contribuyen a la limitada información bibliográfica sobre las semillas de A. tenuifoliosus y representan un punto de partida para evaluar su potencial como fuente valiosa de proteínas, antioxidantes naturales y compuestos bioactivos seguros.
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