CHANGES IN CHEMICAL COMPOSITION, TOTAL PHENOLIC CONTENT AND ANTIOXIDANT ACTIVITIES OF JUJUBE (Ziziphus jujuba Mill.) FRUITS AT DIFFERENT MATURATION STAGES


GÜNDÜZ K. , Saraçoğlu O.

ACTA SCIENTIARUM POLONORUM-HORTORUM CULTUS, cilt.13, ss.187-195, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 13 Konu: 2
  • Basım Tarihi: 2014
  • Dergi Adı: ACTA SCIENTIARUM POLONORUM-HORTORUM CULTUS
  • Sayfa Sayıları: ss.187-195

Özet

Jujube (Ziziphus jujuba Mill.) fruit is an important medicinal plant in Turkey. Several characteristics of jujube fruit harvested at four maturation stages were evaluated. The maturation stages were classified by degree (%) of dark color formation on the fruit surface [Stage (S1), '1-10% (S2), 11-50% (S3), 51-100% (S4)]. Fruit weight, width, length, stone weight, flesh/stone ratio, total soluble solids (TSS), titratable acidity (TA), organic acids and specific sugars were determined. Total phenolic content (TPC) was measured along with antioxidant activity (AOC), determined by Ferric Reducing Ability of Plasma (FRAP) and Trolox Equivalent Antioxidant Capacity (TEAC). Results of the study showed that TSS increased from 12.8% to 18.3% from the S1 to the S4 fruit stage, respectively. The S3 had the highest TPC (6518 mg GAE. kg fw). The highest AOC were recovered from S2 (TEAC; 74.4 Amol TE. g fw, FRAP; 50.9 piano' TE. g fw), followed by S3 (TEAC; 63.6 Amol TE.g fw, FRAP; 37.6 Amol TE-g fw). The main organic acid was citric acid as determined by the HPLC method. Fructose content tended to be more stable than glucose or sucrose.