Author/Authors :
köseoğlu, oya ministry of food - agriculture and livestock directorship of olive research institute, İzmir, Turkey , sevim, didar ministry of food - agriculture and livestock directorship of olive research institute, İzmir, Turkey , ulaş, mehmet ministry of food - agriculture and livestock directorship of olive research institute, İzmir, Turkey , özdemir, durmuş izmir institute of technology - faculty of science - department of chemistry, İzmir, Turkey
Title Of Article :
Determination of Bitterness Index (K225) and Total Fenol Content of Olive Oils Obtained With Different Regions, Varieties and Processing Systems
Abstract :
In this work the effect of different growing areas on olive (Ayvalik, Memecik, Gemlik, Beylik, Edincik Su, Girit, Kilis Yaglik, Sari Ulak, Tav$anYiiregi, Topak ASi) oil bitterness index (K225) were studied at the South Marmara, South and North Aegean, West and East Mediterranean Regions at two, two and a half (2.5), and three phase extraction system, during 2014/2015 crop season. A total of 41 virgin olive oils samples were collected from these Regions. Total phenol content and bitternes index (K225) were analyzed in the research. A Solid-Phase Extraction procedure were carried out for extraction of the bitter compounds. The results of total phenol content and K225 values showed that the Beylik olive oil was determined with the highest total phenol conent and bitterness index (K225) with 330.26 mg Caffeic Acid Equivalents (CAE) kg^-1 oil and 1.21 at 2.5 phase extraction system from Manavgat at the West Mediterranean Region, respectively. After the Beylik variety, the highest total phenol content was determined Ayvalik and Edincik Su olive oil with 291.03 and 270.62 mg CAE kg 1 oil, respectively. The Memecik and Ayvalik olive oil bitterness index (K225) was determined 0.86 and 0.85 at two phase extraction system from Mugla and Burhaniye at the South and North Aegean, respectively.
NaturalLanguageKeyword :
K225 value , extraction systems , Turkish olive varieties , geographical regions
JournalTitle :
The Journal Of Ege University Faculty Of Agriculture
