The stability of palm oils during heating in a rancimat

Marini Damanik, Michael Murkovic

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The crude palm oil (CPO) and refined palm oil (PO) not only have a balance of saturated and unsaturated fatty acids but
also have the highest β–carotene and vitamin E compared to others vegetable oils. A series of aliphatic aldehydes starting
from hexanal to decanal was identified by LC-MS/MS and quantified as DNPH derivatives. In addition, the total amount of
carbonyls was determined based on the calibration with hexanal. Looking at the kinetic profile of the carbonyl formation
in crude palm oil and refined palm oil, both of the oils were still stable until 10 h of oxidation with the Ranzimat at 120 °C.
The analytical method for quantifying the vitamin E and β–carotene are quick, reliable, precise, economical and suitable
for the routine analysis. For both analyses, a simple dilution of the oil was necessary. The quantitative analysis showed
that β–carotene in the oxidized crude palm oil decreased from 2.34 mg/g to 0.33mg/g within 7.5 h of oxidation. However,
after 7.5 h, no more β–carotene was detected. In addition, β–carotene was not detected in refined palm oil. The HPLC-DAD
method developed for the β–carotene in the crude palm oil was validated. The coefficient of determination (0.999) of the
linear regression indicates a good correlation between the peak area and the amount of β–carotene. The linearity of the β–
carotene analysis was tested in the range 0.00078–0.05 μg/cm3. The limit of detection (LOD) was 2.65 μg/cm3 and the limit
of quantification (LOQ) was 8.83 μg/cm3 for β–carotene.
Vitamin E in both refined and crude palm oil, δ–tocotrienol and γ–tocotrienol, have the long shelf life compared to α–tocopherol
and γ–tocopherol. The δ–tocotrienol is degraded slowly and can be found even after 15 h of oxidation with 0.035 mg/g
remaining in the oxidized crude palm oil. However, in refined palm oil, the δ–tocotrienol could be determined until 11 h of
oxidation with 0.49 mg/g.
Original languageEnglish
Pages (from-to)1293-1299
Number of pages7
JournalEuropean food research and technology
Volume244
DOIs
Publication statusE-pub ahead of print - 2018

Fingerprint

palm oils
Carotenoids
carotenes
Heating
Petroleum
heat
Tocotrienols
tocotrienols
Vitamin E
vitamin E
oxidation
Oils
palm oil
oils
Tocopherols
Plant Oils
Unsaturated Fatty Acids
tocopherols
vegetable oil
Aldehydes

Fields of Expertise

  • Human- & Biotechnology

Cite this

The stability of palm oils during heating in a rancimat. / Damanik, Marini; Murkovic, Michael.

In: European food research and technology, Vol. 244, 2018, p. 1293-1299.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Murkovic, Michael

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N2 - The crude palm oil (CPO) and refined palm oil (PO) not only have a balance of saturated and unsaturated fatty acids butalso have the highest β–carotene and vitamin E compared to others vegetable oils. A series of aliphatic aldehydes startingfrom hexanal to decanal was identified by LC-MS/MS and quantified as DNPH derivatives. In addition, the total amount ofcarbonyls was determined based on the calibration with hexanal. Looking at the kinetic profile of the carbonyl formationin crude palm oil and refined palm oil, both of the oils were still stable until 10 h of oxidation with the Ranzimat at 120 °C.The analytical method for quantifying the vitamin E and β–carotene are quick, reliable, precise, economical and suitablefor the routine analysis. For both analyses, a simple dilution of the oil was necessary. The quantitative analysis showedthat β–carotene in the oxidized crude palm oil decreased from 2.34 mg/g to 0.33mg/g within 7.5 h of oxidation. However,after 7.5 h, no more β–carotene was detected. In addition, β–carotene was not detected in refined palm oil. The HPLC-DADmethod developed for the β–carotene in the crude palm oil was validated. The coefficient of determination (0.999) of thelinear regression indicates a good correlation between the peak area and the amount of β–carotene. The linearity of the β–carotene analysis was tested in the range 0.00078–0.05 μg/cm3. The limit of detection (LOD) was 2.65 μg/cm3 and the limitof quantification (LOQ) was 8.83 μg/cm3 for β–carotene.Vitamin E in both refined and crude palm oil, δ–tocotrienol and γ–tocotrienol, have the long shelf life compared to α–tocopheroland γ–tocopherol. The δ–tocotrienol is degraded slowly and can be found even after 15 h of oxidation with 0.035 mg/gremaining in the oxidized crude palm oil. However, in refined palm oil, the δ–tocotrienol could be determined until 11 h ofoxidation with 0.49 mg/g.

AB - The crude palm oil (CPO) and refined palm oil (PO) not only have a balance of saturated and unsaturated fatty acids butalso have the highest β–carotene and vitamin E compared to others vegetable oils. A series of aliphatic aldehydes startingfrom hexanal to decanal was identified by LC-MS/MS and quantified as DNPH derivatives. In addition, the total amount ofcarbonyls was determined based on the calibration with hexanal. Looking at the kinetic profile of the carbonyl formationin crude palm oil and refined palm oil, both of the oils were still stable until 10 h of oxidation with the Ranzimat at 120 °C.The analytical method for quantifying the vitamin E and β–carotene are quick, reliable, precise, economical and suitablefor the routine analysis. For both analyses, a simple dilution of the oil was necessary. The quantitative analysis showedthat β–carotene in the oxidized crude palm oil decreased from 2.34 mg/g to 0.33mg/g within 7.5 h of oxidation. However,after 7.5 h, no more β–carotene was detected. In addition, β–carotene was not detected in refined palm oil. The HPLC-DADmethod developed for the β–carotene in the crude palm oil was validated. The coefficient of determination (0.999) of thelinear regression indicates a good correlation between the peak area and the amount of β–carotene. The linearity of the β–carotene analysis was tested in the range 0.00078–0.05 μg/cm3. The limit of detection (LOD) was 2.65 μg/cm3 and the limitof quantification (LOQ) was 8.83 μg/cm3 for β–carotene.Vitamin E in both refined and crude palm oil, δ–tocotrienol and γ–tocotrienol, have the long shelf life compared to α–tocopheroland γ–tocopherol. The δ–tocotrienol is degraded slowly and can be found even after 15 h of oxidation with 0.035 mg/gremaining in the oxidized crude palm oil. However, in refined palm oil, the δ–tocotrienol could be determined until 11 h ofoxidation with 0.49 mg/g.

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DO - 10.1007/s00217-018-3044-1

M3 - Article

VL - 244

SP - 1293

EP - 1299

JO - European food research and technology

JF - European food research and technology

SN - 1438-2377

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