Fig 1.
Map of Amhara regional state administrative zones and sub-districts showing the sampling sites of teff samples.
Fig 2.
UV-Vis spectra of Gallic acid standard (a) and its calibration curve (b).
Fig 3.
UV-Vis spectra of Catechin standard (a) and its calibration curve (b).
Fig 4.
UV-Vis spectra of Quercetin standard (a) and its calibration curve (b).
Table 1.
Concentration (mean±standard deviation) of TPC (mg G.A.E./100g), TFC-C.E (mg C.E./100g), and TFC-Q.E (mg Q.E./100 g) of teff samples from 21 sub-districts of Amhara region.
Fig 5.
Variation of phenolic contents with error bar graphs based on their administrative zones at a confidence interval of 95%.
Table 2.
Analysis of variance (ANOVA) among 72 teff samples from three among three administrative zones.
Fig 6.
Pearson correlation matrix of teff samples variables (72 samples × 3 variables).
Fig 7.
Dendrogram from agglomerative hierarchical cluster analysis of 72 teff samples using phenolic parameters.
Fig 8.
Biplot of the phenolic observations and variables based on geographic origins.