Preliminary communication
https://doi.org/10.17508/CJFST.2018.10.1.09
Sterol, triterpen dialcohol and fatty acid profile of less- and well-known Istrian monovarietal olive oil
KAROLINA BRKIĆ BUBOLA
orcid.org/0000-0002-7132-9220
; Institute of Agriculture and Tourism, Department for Agriculture and Nutrition, K. Huguesa 8, HR-52440 Poreč, Croatia
VASILIJ VALENČIČ
; Institute for Oliveculture, Science and Research Centre Koper, Garibaldijeva 1, SI-6000 Koper, Slovenia
MILENA BUČAR-MIKLAVČIČ
; LABS LLC, Institute for Ecology, Olive Oil and Control, Zelena ulica 8c, SI-6310 Izola, Slovenia
MARIN KRAPAC
; Institute of Agriculture and Tourism, Department for Agriculture and Nutrition, K. Huguesa 8, HR-52440 Poreč, Croatia
MARINA LUKIĆ
; Institute of Agriculture and Tourism, Department for Agriculture and Nutrition, K. Huguesa 8, HR-52440 Poreč, Croatia
ELVINO ŠETIĆ
; Institute of Agriculture and Tourism, Department for Agriculture and Nutrition, K. Huguesa 8, HR-52440 Poreč, Croatia
BARBARA SLADONJA
; Institute of Agriculture and Tourism, Department for Agriculture and Nutrition, K. Huguesa 8, HR-52440 Poreč, Croatia
Abstract
The aim of this study was to characterize monovarietal olive oils obtained from
two less known autochthonous cultivars (Bova and Buža puntoža) on the basis
of sterols, triterpene dialcohols and fatty acids profile for the first time, and three
monovarietal olive oils obtained from the most widespread autochthonous
cultivars (Buža, Istarska bjelica and Rosinjola) grown in Istria, Croatia.
β-sitosterol, Δ-5-avenasterol and campesterol were the most abundant sterols in
all samples. Campesterol, β-sitosterol and Δ-5-avenasterol most significantly
differentiated investigated oils. Bova oil had the highest amount of total sterols
(2964 ± 458 mg/kg). Istarska bjelica oil had a peculiar sterol composition with
exceptionally low β-sitosterol (67%), high Δ-5-avenasterol (27%) and the
highest triterpene dialcohols percentages. Rosinjola and Istarska bjelica oils had
the highest monounsaturated fatty acids level, Buža oil had the highest
polyunsaturated fatty acids level, while Bova oil showed the highest level of
saturated fatty acids. Tested oils obtained from the most abundant cultivars
fulfilled all the demands of the current EU regulation required for virgin olive
oil regarding sterols, triterpene dialcohols and fatty acids, but Bova and Buža
puntoža oil slightly exceeded the upper limit for linolenic acid. Since cultivar is
the source of natural variation of sterols, triterpene dialcohols and fatty acids in
virgin olive oils, the knowledge about the content of these particular compounds
in different monovarietal oils from autochthonous cultivars is important to
determine possible disagreements with the demands of the current legislation
required for virgin olive oils, in order to anticipate possible false results
indicating adulteration.
Keywords
cultivar; virgin olive oil; sterols; triterpene dialcohols; fatty acids
Hrčak ID:
200560
URI
Publication date:
25.5.2018.
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