{"id":157033,"date":"2021-12-13T13:02:02","date_gmt":"2021-12-13T13:02:02","guid":{"rendered":"https:\/\/blog.hannaservice.eu\/peroksidna-vrednost-u-uljima\/"},"modified":"2022-12-16T12:53:01","modified_gmt":"2022-12-16T12:53:01","slug":"peroksidna-vrednost-u-uljima","status":"publish","type":"post","link":"https:\/\/blog.hannaservice.eu\/sr\/peroksidna-vrednost-u-uljima\/","title":{"rendered":"Peroksidna vrednost u uljima"},"content":{"rendered":"\t\t
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Dok jestiva ulja (kao \u0161to su kokosovo ulje, maslinovo ulje, suncokretovo ulje…) dele mnoge kvalitete, potro\u0161a\u010di mogu izabrati odre\u0111eno ulje na osnovu njegove cene, jedinstvenih zdravstvenih prednosti i karakteristi\u010dne sposobnosti da pobolj\u0161aju ukus obroka. Svako ulje ima svoj rok trajanja.<\/strong> Zavisi od sastava samog ulja, njegovog pakovanja i skladi\u0161tenja i rukovanja nakon otvaranja. Vremenom se jestiva ulja mogu razgraditi i pokvariti.<\/strong> Primarni uzrok razgradnje jestivog ulja je oksidacija.<\/strong> Kako dolazi do oksidacije ulja, ukusi i mirisi se mogu promeniti, \u0161to rezultira proizvodom koji je nepo\u017eeljan za potro\u0161a\u010de. Primarni proizvodi oksidacije su peroksidi<\/strong>, hidroperoksidi i slobodni radikali. Oni deluju kao katalizatori cele reakcije i ubrzavaju je. Sekundarni proizvodi su aldehidi, ketoni, alkoholi, masne kiseline, oksi masne kiseline, epoksidi koji izazivaju u\u017eeglost proizvoda. Peroksidi lako gube jedan atom kiseonika i pretvaraju se u obi\u010dne okside i stoga su jaka oksidaciona sredstva.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Ova reakcija oksidacije c\u0301e se verovatnije desiti pod odre\u0111enim uslovima, uklju\u010dujuc\u0301i izlaganje svetlosti, prisustvo metalnih jona, uvo\u0111enje kiseonika ili kada se ne odr\u017eavaju temperature skladi\u0161tenja.<\/strong> Da bi se utvrdio kvalitet ulja i po\u010detak oksidacije, odre\u0111uje se peroksidna vrednost.<\/strong> Peroksidna vrednost se defini\u0161e kao koli\u010dina peroksidnog kiseonika po kilogramu ulja, koja se iskazuje u jedinicama miliekvivalenata ili mek.<\/p>

Peroksidna vrednost <\/strong>nam mnogo govori o kvalitetu ulja.<\/strong> Peroksidni broj ozna\u010dava koli\u010dinu hidroperoksida i peroksida prisutnih u ulju. Ulja sa peroksidnom vredno\u0161c\u0301u u rasponu od 1 do 3 mmol O2 \/ kg<\/strong> smatraju se sve\u017eim i dobrog kvaliteta.<\/strong> Ulja \u010dija peroksidna vrednost <\/em>\u200b\u200b<\/em><\/strong>ne<\/em><\/strong>prelazi 10mol O2 \/ kg<\/strong> smatraju se pogodnim za ljudsku upotrebu.<\/strong>Peroksidni broj se smatra indikatorom po\u010detne faze oksidacije ulja jer su hidroperoksidi koji nastaju izuzetno nestabilni i vrlo brzo se razla\u017eu u tzv. sekundarne oksidacione produkte.<\/em><\/p>

Za merenje vrednosti peroksida u ulju preporu\u010dujemo:<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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HI83730<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tFotometar za odre\u0111ivanje
peroksidne vrednosti ulja\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Prenosni fotometar HI83730 za odre\u0111ivanje vrednosti peroksida u uljima kombinuje ta\u010dnost i lakoc\u0301u upotrebe u ergonomskom, prenosivom dizajnu. Korisnik mo\u017ee precizno odrediti peroksidnu vrednost maslinovog ulja u opsegu od 0,0 do 25,0 mek O2\/kg koristec\u0301i HI83730-20 gotove reagense.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Za odre\u0111ivanje peroksidnog broja pomoc\u0301u referentne metode AOCS Cd 8b-90 ili referentne metode AOAC 965.33 koristite Hanna Instruments HI931 automatski potenciometrijski titrator.<\/strong><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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HI931<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\tAutomatski potenciometrijski titrator\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Automatski titrator HI931 je odgovor na va\u0161e namenske potrebe za titracijom. Potpuno prilagodljiv, HI931 pru\u017ea precizne rezultate i intuitivno korisni\u010dko iskustvo, sve u kompaktnom pakovanju. Titrirajte za razna merenja pritiskom na dugme, uklju\u010dujuc\u0301i kiseline, baze, redoks i selektivne jone. Bez dodatnih nadogradnji programiranja za kupovinu, mo\u017eete odmah po\u010deti da merite. Ovaj titrator ima moguc\u0301nost, pored mnogih drugih metoda, da titrira vrednost peroksidnog broja i za ovo merenje postoje dve standardizovane metode.<\/p>

Metoda za odre\u0111ivanje peroksidne vrednosti (PV) u rafinisanim i nerafinisanim jestivim uljima, prema AOAC 965.33 do krajnje ta\u010dke mV. Rezultati su izra\u017eeni u mek\/kg PV (peroksidna vrednost).<\/p>

Metoda za odre\u0111ivanje peroksidne vrednosti (PV) u rafinisanim i nerafinisanim jestivim uljima, pratec\u0301i AOCS Cd 8b-90 do krajnje ta\u010dke mV. Rezultati su izra\u017eeni u mek\/kg PV (peroksidna vrednost).<\/p>

Kontaktirajte nas za vi\u0161e informacija o kvalitetu va\u0161eg ulja.<\/p>

Author:<\/strong> Tajana Mokrovi\u0107, mag.nutr.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Dok jestiva ulja (kao \u0161to su kokosovo ulje, maslinovo ulje, suncokretovo ulje…) dele mnoge kvalitete, […]<\/p>\n","protected":false},"author":17,"featured_media":156771,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[365],"tags":[],"class_list":["post-157033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hrana"],"yoast_head":"\nPeroksidna vrednost u uljima - Hanna Instruments Srbja<\/title>\n<meta name=\"description\" content=\"Peroksidna vrednost nam mnogo govori okvalitetu ulja. 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