SD Dojavi Slobodna Dalmacija
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Najveći neprijatelji kvalitete ulja su svjetlo, prisutnost kisika i temperatura. Svjetlo ima veoma reaktivno djelovanje, posebno kod zelenih ulja koja sadrže klorofil. Njih apsolutno treba čuvati u mraku, jer dok klorofil u tami djeluje kao konzervans, na svjetlu postaje reaktivan i više tisuća puta ubrzava oksidaciju.

Kisik direktno vrši oksidaciju ulja i to izaziva užeglosti. Zbog toga ulje treba čuvati u zatvorenim posudama i što manje treba biti u doticaju sa zrakom. Antioksidansi u njemu (polifenoli i drugo) mogu vezati određenu količinu kisika i usporiti taj proces, ali ulje siromašno tim tvarima, ubrzo i samo oksidira i u dobro zatvorenim posudama.

Ni preniska, a ni previsoka temperatura nije dobra za čuvanje ulja.

Na višim temperaturama, posebno višim od 24 stupnja, svi nepoželjni procesi se ubrzavaju (enzimski, oksidacija i eventualna fermentacija), dok ga zamrzavanje čini nestabilnim na drugi način.

Zbog svega toga nije dobro čuvati ulje na temperaturama nižim od 10 stupnjeva, ni višim od 20 stupnjeva. Idealno bi bilo da stalna temperatura bude u rasponu od 14 do 16 stupnjeva.

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ZBOG ČEGA NIJE DOBRO ZAMRZNUTI MASLINOVO ULJE


Na temperaturi od oko +8 stupnjeva ulje se postepeno kristalizira, pri čemu se najprije zgrušaju zasićene masne kiseline, a više zastupljene i u tekućoj fazi ostaju nezasićene masne kiseline, koje su podložnije oksidaciji.

Nadalje, polifenoli, kao najbolji čuvari stabilnosti, izdvajaju se u mikrokapljica vode i gube svoju zaštitničku funkciju te dolazi i do koncentracije peroksida, tj. pojačane oksidacije. Ti su procesi nepovratni te se odleđivanjem i miješanjem stabilnost ne vraća.

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Najveći neprijatelji kvalitete ulja su svjetlo, prisutnost kisika i temperatura. Svjetlo ima veoma reaktivno djelovanje, posebno kod zelenih ulja koja sadrže klorofil. Njih apsolutno treba čuvati u mraku, jer dok klorofil u tami djeluje kao konzervans, na svjetlu postaje reaktivan i više tisuća puta ubrzava oksidaciju.

Kisik direktno vrši oksidaciju ulja i to izaziva užeglosti. Zbog toga ulje treba čuvati u zatvorenim posudama i što manje treba biti u doticaju sa zrakom. Antioksidansi u njemu (polifenoli i drugo) mogu vezati određenu količinu kisika i usporiti taj proces, ali ulje siromašno tim tvarima, ubrzo i samo oksidira i u dobro zatvorenim posudama.

Ni preniska, a ni previsoka temperatura nije dobra za čuvanje ulja.

Na višim temperaturama, posebno višim od 24 stupnja, svi nepoželjni procesi se ubrzavaju (enzimski, oksidacija i eventualna fermentacija), dok ga zamrzavanje čini nestabilnim na drugi način.

Zbog svega toga nije dobro čuvati ulje na temperaturama nižim od 10 stupnjeva, ni višim od 20 stupnjeva. Idealno bi bilo da stalna temperatura bude u rasponu od 14 do 16 stupnjeva.

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ZBOG ČEGA NIJE DOBRO ZAMRZNUTI MASLINOVO ULJE


Na temperaturi od oko +8 stupnjeva ulje se postepeno kristalizira, pri čemu se najprije zgrušaju zasićene masne kiseline, a više zastupljene i u tekućoj fazi ostaju nezasićene masne kiseline, koje su podložnije oksidaciji.

Nadalje, polifenoli, kao najbolji čuvari stabilnosti, izdvajaju se u mikrokapljica vode i gube svoju zaštitničku funkciju te dolazi i do koncentracije peroksida, tj. pojačane oksidacije. Ti su procesi nepovratni te se odleđivanjem i miješanjem stabilnost ne vraća.

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StoryEditorOCM
Maslinarstvo

struka savjetujePojašnjavamo kako i na kojoj temperaturi čuvati maslinovo ulje i zašto nije dobro zamrznuti ga

Piše Edi Družetić, agronom
11. ožujka 2022. - 07:30
21212198
Ilustracija/Shutterstock

Najveći neprijatelji kvalitete ulja su svjetlo, prisutnost kisika i temperatura. Svjetlo ima veoma reaktivno djelovanje, posebno kod zelenih ulja koja sadrže klorofil. Njih apsolutno treba čuvati u mraku, jer dok klorofil u tami djeluje kao konzervans, na svjetlu postaje reaktivan i više tisuća puta ubrzava oksidaciju.

Kisik direktno vrši oksidaciju ulja i to izaziva užeglosti. Zbog toga ulje treba čuvati u zatvorenim posudama i što manje treba biti u doticaju sa zrakom. Antioksidansi u njemu (polifenoli i drugo) mogu vezati određenu količinu kisika i usporiti taj proces, ali ulje siromašno tim tvarima, ubrzo i samo oksidira i u dobro zatvorenim posudama.

Ni preniska, a ni previsoka temperatura nije dobra za čuvanje ulja.

Na višim temperaturama, posebno višim od 24 stupnja, svi nepoželjni procesi se ubrzavaju (enzimski, oksidacija i eventualna fermentacija), dok ga zamrzavanje čini nestabilnim na drugi način.

Zbog svega toga nije dobro čuvati ulje na temperaturama nižim od 10 stupnjeva, ni višim od 20 stupnjeva. Idealno bi bilo da stalna temperatura bude u rasponu od 14 do 16 stupnjeva.

ZBOG ČEGA NIJE DOBRO ZAMRZNUTI MASLINOVO ULJE


Na temperaturi od oko +8 stupnjeva ulje se postepeno kristalizira, pri čemu se najprije zgrušaju zasićene masne kiseline, a više zastupljene i u tekućoj fazi ostaju nezasićene masne kiseline, koje su podložnije oksidaciji.

Nadalje, polifenoli, kao najbolji čuvari stabilnosti, izdvajaju se u mikrokapljica vode i gube svoju zaštitničku funkciju te dolazi i do koncentracije peroksida, tj. pojačane oksidacije. Ti su procesi nepovratni te se odleđivanjem i miješanjem stabilnost ne vraća.

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18. svibanj 2024 16:12