Oxidative Stability of Cold Pressed Sunflower Oil under Different Storage Conditions

Yıl 2017, Cilt: 15 Sayı: 2, 155 - 162, 11.08.2017

S. Sezer Kıralan , Mustafa Kıralan

https://doi.org/10.24323/akademik-gida.333672

Cited By: 2

Öz

Cold pressed sunflower oil was exposed to thermal and
photooxidation, and under these conditions, the values of peroxide (PV) and
conjugated diene (K₂₃₂) were used to follow lipid oxidation. In
addition to the classical oxidation tests, the data of volatile oxidation
compounds in the oils throughout the thermal and photooxidation were collected
by employing HS-SPME (headspace–solid phase
microextraction) coupled with GC-MS (gas chromatography–mass spectrometry). Under
the thermal oxidation conditions at 60°C, the values of PV and K₂₃₂ increased
up to 79.68 meq O₂/kg and 20.03 at the end of storage, respectively.
Six volatile compounds (hexanal, 2-hexenal, 2-heptenal, E-2-octenal, E, Z-2,4-decadienal
and E,E-2,4-decadieanal) were determined during the thermal oxidation. At the
end of photooxidation conditions, PV and K₂₃₂ values of oils were detected
as 116.97 meq O₂/kg and 22.53, respectively. It is at least equally
important as the other findings that the hexanal was only detected volatile oxidation
compound under photooxidation conditions.

Anahtar Kelimeler

Sunflower oil, Cold pressed oil, Thermal oxidation, Photooxidation

Soğuk Pres Ayçiçeği Yağının Farklı Depolama Koşullarındaki Oksidatif Stabilitesi

Öz

Soğuk pres ayçiçeği yağı termal ve fotooksidasyona tabi tutulmuştur. Bu
koşullar altında oksidasyonun izlenmesinde peroksit değeri (PD) ve konjuge dien
değeri (K₂₃₂) kullanılmıştır. Bu klasik oksidasyon testleri yanında,
termal ve fotooksidasyon süresince yağlardaki uçucu oksidasyon bileşenleri
verileri tepe boşluğu-katı faz mikro-ekstraksiyon (HS-SPME) ve gaz kromatografi-kütle
spektrometresi (GC-MS) yöntemi kullanılarak toplanmıştır. 60°C sıcaklıkta
termal oksidasyon koşullarında depolama sonunda, PD ve K₂₃₂
değerleri sırası ile 79.68 meq
O₂/kg ve 20.03’e kadar arttığı bulunmuştur. Termal oksidasyon
süresince 6 uçucu
oksidasyon bileşeni (hekzanal, 2-hekzenal, 2-heptenal, E-2-oktenal, E,Z-2,4-dekadienal
ve E,E-2,4-dekadienal) belirlenmiştir. Fotooksidasyon sonunda, PD ve K₂₃₂
değerleri sırası ile 116.97
meq O₂/kg ve 22.53 olarak tespit edilmiştir. Fotooksidasyon
koşulları süresince belirlenen tek uçucu oksidasyon bileşeni hekzanal da en
azından diğer bulgular ile aynı derece önemlidir.

Anahtar Kelimeler

Ayçiçeği yağı, Soğuk pres yağı, Termal oksidasyon, Foto-oksidasyon

Kaynakça

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