Revista Colombiana de Química (Aug 2013)
Research of antioxidant capacity of araza (Eugenia stipitata Mc Vaugh) during the ripening
Abstract
The araza is a fruit native of the Amazon region, like other fruits of this region has some antioxidant components. This work was carried out the classification of the fruits of araza in four different states using as the index of maturity, then phenolic compounds were extracted using mixtures of solvents (methanol, acetone, water) and your content was determined by the spectrophotometric method Folin-Ciocalteu in the epicarp and mesocarp. Additionally, partially identified phenolic compounds by reversed phase HPLC with diode array, finding the phenolic acids such as chlorogenic, gallic and caffeic, such as phenols responsible for the majority of araza antioxidant activity. It was noted that araza mesocarp polyphenol content was higher in the green (1200 mg/1000g fruto BH) state followed by mature (1200 mg/1000g fruto BH), pinton (905 mg/1000g fruto BH) and over mature (550 mg/1000g fruto BH) while the epicarp was greater in states mature (170 mg/1000g fruto BH) and green (295 mg/1000g fruto BH) followed of the over-mature (50 mg/1000g fruto BH) and pinton (100 mg/1000g fruto BH) states. The antioxidant capacity was determined by three hydrophilic methods (ABTS, DPPH and FRAP) in the mesocarp found that the antioxidant capacity was higher in the green state followed by mature), pinton and over mature while the epicarp was higher in mature, green, pinton) and over-mature state. We also determined the antioxidant capacity by a lipophilic method (b-carotene bleaching) found that in the mesocarp was higher in states followed by mature (110 mg/1000g fruto BH), pinton (90 mg/1000g fruto BH) and green (26 mg/1000g fruto BH) while in the epicarp was higher in the over mature stage (50 mg/1000g fruto BH)followed by greeen states (45 mg/1000g fruto BH), mature (55 mg/1000g fruto BH)and sobre mature (25 mg/1000g fruto BH). Finally we conclude that the mature and green had the highest antioxidant capacity, phenolic compounds being present in the epicarp and mesocarp were the major contributors.
