Prediction model of the effect of light intensity on phenolic contents in hypericum triquetrifolium turra

Abstract

The objective of the present study is to develop a prediction model for the phenolic contents in Hypericum triquetrifolium Tuna with multiple regression analysis. The best estimating equations for the phenolic compounds (chlorogenic acid, rutin, hyperoside, isoquercetrin, quercitrin and quercetin) contents are formulized as PC = (a) + x L) + (c x L-2), where PC is the phenolic content, L is light intensity (mu mol m(2) s(-1)) and a, b and c are coefficients. Multiple regression analysis was carried out until the least sum of squares (R-2) was obtained. R2 value was 0.70 for rutin and 0.97 for chlorogenic acid. Standard errors were found to be significant at the p<0.001 level.