Changes in chemical composition, total phenolic content and antioxidant activities of jujube (Ziziphus jujuba Mill.) fruits at different maturation stages

• Autorzy: Gunduz K. , Saracoglu O.

Warianty tytułu

PL

Zmiany w składzie chemicznym, całkowitej zawartości fenoli i aktywności antyoksydacyjnej owoców głożyny pospolitej (Ziziphus jujuba Mill.) na różnych poziomach dojrzewania

• Języki publikacji: EN

Abstrakty

EN

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 μmol TE‧g fw, FRAP; 50.9 μmol TE‧g fw), followed by S3 (TEAC; 63.6 μmol TE‧g fw, FRAP; 37.6 μmol 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.

PL

Owoce głożyny pospolitej (Ziziphus jujuba Mill.) są ważną rośliną leczniczą w Turcji. Oceniono kilka cech głożyny zebranej w czterech fazach dojrzewania. Etapy dojrzewania oceniono według stopnia (%) tworzenia się ciemnego koloru na powierzchni owoców [etap (E1), 1–10% (E2), 11–50% (E3), 51–100% (E4)]. Określono wagę, długość i szerokość owoców, wagę pestek, stosunek miąższu do pestki, całkowitą zawartość rozpuszczalnych substancji stałych (TSS), kwasowość miareczkową (TA) oraz kwasy organiczne i cukry. Całkowitą zawartość fenoli (TPC) zmierzono razem z aktywnością antyoksydacyjną według metody FRAP i TEAC. Wyniki badania wykazały, że TSS zwiększył się, odpiwiednio, z 12,8% do 18,3% od etapu E1 do E4. E3 miał najwyższy TPC (6518 mg GAE·kg świeżej masy). Najwyższe AOC stwierdzono w E2 (TEAC; 74,4 µmol TE·g świeżej masy, FRAP; 50,9 µmol TE·g świeżej masy), następnie w E3 (TEAC; 63,6 µ mol TE·g świeżej masy, FRAP; 37,6 µmol TE·g świeżej masy). Głównym kwasem organicznym był kwas cytrynowy określony metodą HPLC. Zawartość fruktozy była bardziej stabilna niż glukozy czy sacharozy.

• Wydawca: -
• Czasopismo: Acta Scientiarum Polonorum. Hortorum Cultus
• Rocznik: 2014
• Tom: 13
• Numer: 2
• Opis fizyczny: p.187-195,fig.,ref.

Twórcy

autor

Gunduz K.

• Department of Horticulture, Faculty of Agriculture, Mustafa Kemal University, 31034, Antakya, Hatay, Turkey,

autor

Saracoglu O.

• Gaziosmanpasa University, Tokat, Turkey

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