Relationship Between Colour and Bioactive Compounds of Landscape Flowers
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Abstract
Flowers are an integral part of the agricultural ecosystem. Many flowers provide economic, ecological, and human health values. Flowers also contain secondary compounds with antioxidative potential which are beneficial for human health. The knowledge of bioactive compounds can encourage people to pay closer attention to flowers in the agricultural ecosystem. Therefore, this research aimed to study relationship between pigment colour and the antioxidant compounds of selected flowers including total phenolic content, total flavonoid content and antioxidant activity. Eight types of agricultural landscape flowers; namely marigold, sunflower, yellow cosmos, purple cosmos, sunn hemp, flame of the forest, red and green quinoa (Chenopodium quinoa W.) were collected during late winter (January 2020). All samples were lyophilized and then extracted using methanol maceration. Colour values (CIEL*a*b*), bioactive compound contents, and flower extract relationships were thus evaluated using chemometric method. The results indicated that flame of the forest had the highest values of red (26.14), yellow (131.87) and total phenolic content (0.09 GAE catechin/extract). While marigold contained the highest content of total phenolic compound (4.01 GAE catechin/extract) and antioxidant activity (75.45 percent). As a result, the overall flavonoid content was related to the red and yellow values of landscape flowers. The total quantity of phenolic compounds was linked to antioxidant activity. Nevertheless, the brightness value (L*) of the flowers did not correlate with the bioactive compounds. This research explored new economic possibilities for flowers in agricultural landscapes and argues for complete and biodiverse agricultural ecosystem.
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