The study was conducted to determine reletaion in the among biochemical properties with kernel size in Çakıldak cultivar. For this purpose, kernels were divided into three groups as small (9.0-11.0), medium (11.01-13.0) and large (13.01-15.0) according to kernel size. In kernels classified according to kernel size were detected oil ratio, protein ratio, total phenolics content, total flavonoids content and antioxidant capacity (according to FRAP and DPPH assays). While the effect of kernel size on protein ratio was insignificant (p> 0.05), it was determined to have a significant effect on oil ratio, total phenolics content, total flavonoids content and antioxidant capacity (p<0.05). According to kernel size, was determined from 56.74% (small) to 58.02% (medium) for oil ratio, 16.24% (small) to 17.85% (büyük) for protein ratio, 662.3 (medium) to 763.5 (small) mg 100 g -1 for total phenolics content, 5.42 (large) to 11.56 (small) mg 100 g -1 for total flavonoids content, 3348.0 (medium) to 5883.3 (small) µmol 100 g -1 for antioxidant capacity according to FRAP assay and

With a history of at least three centuries, ''Alişar'' is a local pear (Pyrus communis L.) variety that is widely grown in the district of Şebinkarahisar in Giresun province. In recent years, researches on the bioactive compounds of fruits that are valuable for human health has gained importance. This research was performed to determine fruit bioactive profiles of 27 clones belonging to this variety. The total phenolic content, antioxidant activity and total flavonoid content in the fruits of the clones were investigated as bioactive properties. Total phenolic contents of the clones were found between 72.61-147.38 mg 100 g -1 . In the FRAP and DPPH assays, the antioxidant activity was determined between 2.61-4.27 mmol kg -1 and 0.18-0.76 mmol kg -1 . The total flavonoid content was detected between 3.05-18.01 mg 100 g -1 . According to the FRAP assay, there was a high positive correlation (r = 0.679 ***) between total phenolic and antioxidant activity, while total phenolics showed a moderate relationship with antioxidant activity (R 2 = 0.461). The findings revealed that Alişar pear clones showed variation in fruit bioactive components, and also some clones were rich in bioactive contents. A-19 in total phenolic content, A-23 in antioxidant activity and A-18 in total flavonoid content were evaluated more remarkably than other clones. These clones are thought to contribute as genetic material to pear breeding studies.