GD26065-Ülkemizde satışa sunulan natürel sızma zeytinyağlarının bazı kalite parametreleri ile digliserit içeriklerinin araştırılması

Öz

Bu çalışmada, Türkiye’ de yeni hasat edilmiş ve ambalajlanarak satışa sunulmuş 20 adet natürel sızma zeytinyağı örneğinin bazı kalite kriterleri ve digliserit dağılımları analiz edilmiştir. Serbest yağ asitliği, peroksit değeri, özgül absorbans değerleri ve digliserit analizleri gerçekleştirilmiştir. Örneklerin serbest yağ asitliği % 0.17-0.67, Peroksit değerileri 4.77-14.42 meq O2/kg aralığında ölçülmüştür. Özgül absorbans ölçümleri, taze sıkılmış ilk 10 örnek için K-270 parametresi 0.09-0.16, K-232 parametresi 1.42-2.03 aralığında, Delta-K parametreleri 0 ve altında bulunmuştur. Raftan alınan 10 adet ambalajlı örnek için K-270 parametresi 0.15-0.24, K-232 parametresi 1.86-2.43 ve Delta-K parametresi 0.001-0.013 aralığında ölçülmüştür. Bulgular değerlendirildiğinde; yeni sıkılmış 10 adet örneğin tüm kalite parametrelerinin limitlerin oldukça altında olduğu görülmektedir. Buna karşın, market raflarından alınan ambalajlı ürünlerin büyük çoğunluğunda ise raf ömrü sonuna kadar limitler içerisinde kalması beklenen kalite parametreleri ve digliserit miktarlarının yasal üst limitlere yaklaştığı belirlenmiştir. Bu olumsuz durumun, natürel sızma zeytinyağlarının uygun olmayan koşullarda hasadı, işlenmesi ve saklanması ya da haksız kazanç sağlamak amacıyla düşük kaliteli natürel zeytinyağlarıyla paçallanmasından kaynaklanabileceği düşünülmektedir.

Anahtar Kelimeler

• ; zeytinyağı
• kalite parametreleri
• digliserit(DAG)
• raf ömrü

GD26065-Investigation of some quality parameters and diglyceride content of extra virgin olive oils offered for sale in our country

Öz

ABSTRACT In this study, some quality criteria and diglyceride distributions of 20 samples of freshly harvested and packaged extra virgin olive oil from Turkey were analyzed. Free fatty acid content, peroxide value, specific absorbance values, and diglyceride analyses were performed. The free fatty acid content of the samples was measured in the range of 0.17-0.67%, and peroxide values in the range of 4.77-14.42 meq O2/kg. Specific absorbance measurements showed that for the first 10 freshly pressed samples, the K-270 parameter was in the range of 0.09-0.16, the K-232 parameter in the range of 1.42-2.03, and the Delta-K parameter was 0 or below. For the 10 packaged samples taken from the shelf, the K-270 parameter was measured in the range of 0.15-0.24, the K-232 parameter in the range of 1.86-2.43, and the Delta-K parameter in the range of 0.001-0.013. When the findings were evaluated; Ten freshly pressed samples showed that all quality parameters were well below the limits. In contrast, the vast majority of packaged products from supermarket shelves showed quality parameters and diglyceride levels approaching the legal upper limits, even though these are expected to remain within limits until the end of the shelf life. This negative situation is thought to be due to the harvesting, processing, and storage of extra virgin olive oils under unsuitable conditions, or their blending with lower-quality extra virgin olive oils for the purpose of unfair profit.

Anahtar Kelimeler

• olive oil
• specific absorbance
• ethyl esters
• diglycerides(DAG)
• shelf-life

Kaynakça

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