Evaluation of post-harvest antioxidant content of Yalova Aronia (chokeberry)

In this study, SNPAC method was developed by using hypochlorous (ClO-) at pH 9.3. PVP was used as stabilizer. The existence of HOCl enables to form stronger and more stable yellow emission which gives sensitivity. As result, lower LOD and LOQ values were achieved by AgNP-HOCl method. The obtaining lower values was attributed to reoxidation of silver atoms with ClO- ions in the presence of PVP. The newly modified method was applied to the TAC measurement of tea and juice obtained from Yalova Aronia (Melanocarpa) which is grown in Yalova and has been granted a geographical indication certificate by the Turkish Patent and Trademark Institute under the name of "Yalova Aronia" (Annex 1). The results were compared with the results obtained by application of CUPRAC and FRAP assays. The TAC values of Aronia (Melanocarpa) tea and juice were found as 137.98 and 12.08 mmol TEAC/kg, respectively.