Fruit Biochemical and Nutritional Properties of Some Asian and European Pears (<em style="mso-bidi-font-style: normal;">Pyrus spp.) Grown under Tehran Environmental Conditions

Pear is one of the most important pome fruits in the world fruit market with a high nutritional value. This study was performed to determine the phenolic compounds and some chemical properties of the fruit flesh and peel of ۱۲ Asian and European pears. Chlorogenic acid and rutin were found as the important phenolic compounds in the fruit peel, which were measured using HPLC. Results showed fruit Titratable Acidity (TA, ۰.۱۷-۰.۵۳%(, Total Soluble Solids (TSS, ۱۳.۳۳-۱۷.۳۳ °Brix), firmness (۱.۷-۲.۷۵, kg cm-۲), and color parameters. The highest L* value was observed in KS۷ (۴۰.۵۵), while the lowest was in KS۱۲ (۱۴.۲۶) and KS۱۳ (۱۴.۷۸). Additionally, the study assessed the nutrient and total phenol content of fruit samples. The `Shahmiveh’ cultivar displayed the highest total phenol content (۶۳۸ mg ۱۰۰ g-۱ FW), while the KS۷ cultivar had the lowest (۴۲۰ mg ۱۰۰ g-۱ FW). Potassium was the most abundant nutrient (۱.۱۶ mg ۱۰۰ g-۱ DW), followed by nitrogen and calcium contents. As the total phenol increased, so did the amount of rutin. Principal Components Analysis (PCA) of all data showed that the European and Asian pears studied cultivars and genotypes were different in terms of most of the studied biochemical traits, and significant relationships were observed between some traits. Besides, the obtained results help in the selection of the best pear cultivars or genotypes in terms of the highest phenolic content and nutrients, both for fresh consumption and in the juice industry.

کلیدواژه ها:

Rutin ، Chlorogenic acid ، Pear macronutrients ، Pear micronutrients ، Total phenol