Abstract
The MeOH:H2O (7:3) extracts of leaves from Chilean bean landraces were assessed for total phenolic (TP), total flavonoid (TF), total proanthocyanidin (TPA) content, antioxidant capacity (ORAC, FRAP, TEAC, CUPRAC, DPPH) and the inhibition of enzymes associated with metabolic syndrome (α-glucosidase, α-amylase, pancreatic lipase). The chemical profiles were analyzed by HPLC-DAD. Higher antioxidant activity in the ORAC and CUPRAC assay was found for the landrace Coscorrón, and the best effect in the TEAC for Sapito, respectively. The main phenolics were flavonol glycosides and caffeic acid derivatives. The extracts presented strong activity against α-glucosidase, but were inactive towards α-amylase and pancreatic lipase. The leaf extract from the Sapito landrace was fractionated to isolate the main α-glucosidase inhibitors, leading to caffeoylmalic acid with an IC50 of 0.21 μg/mL. The HPLC fingerprints of the leaves differentiate three groups of chemical profiles, according to the main phenolic content. A significant correlation was found between the α-glucosidase inhibition, the content of caffeoylmalic acid (r = −0.979) and kaempferol 3-O-β-D-glucoside (r = 0.942) in the extracts. The presence of α-glucosidase inhibitors in the leaves of Chilean beans support their potential as a source of bioactive compounds.
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All data generated or analyzed during this study are included in this article and its supplementary information files.
Abbreviations
- CE:
-
Catechin equivalents
- CUPRAC:
-
Cupric reducing antioxidant capacity
- DPPH:
-
2,2-diphenyl-1-picrylhydrazyl radical
- FRAP:
-
Ferric reducing antioxidant power
- GAE:
-
Gallic acid equivalents
- HPLC:
-
High performance liquid chromatography
- LOD:
-
Limit of detection
- LOQ:
-
Limit of quantification
- NPR:
-
Natural products reagent, diphenylboric acid-β-ethylamino ester
- ORAC:
-
Oxygen radical antioxidant capacity
- Rt :
-
Retention time in minutes
- SC50 :
-
Extract concentration scavenging 50% of the DPPH radical
- sh:
-
Shoulder
- TE:
-
Trolox equivalents
- TEAC:
-
Trolox equivalents antioxidant capacity
- TF:
-
Total flavonoid content
- TLC:
-
Thin layer chromatography
- TP:
-
Total phenolic content
- TPA:
-
Total proanthocyanidins
- UV:
-
Ultraviolet
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Funding
N.N. thanks CONICYT for a doctoral grant Folio 21192237. This research received funding from FONDECYT 1210076 and Proyecto Fortalecimiento al Desarrollo Científico de Centros Regionales-ANID R20F0001CEAP.
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Alarcón-Espósito, J., Nina, N., Theoduloz, C. et al. Phenolic Composition and α-Glucosidase Inhibition of Leaves from Chilean Bean Landraces. Plant Foods Hum Nutr 77, 135–140 (2022). https://doi.org/10.1007/s11130-022-00955-6
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DOI: https://doi.org/10.1007/s11130-022-00955-6