Autoxidation Singlet oxygen 1 O 2 Singlet oxygen
- Slides: 32
자동산화 (Autoxidation)
Singlet oxygen (1 O 2)
Singlet oxygen 빛에 의해 triplet oxygen이 singlet oxygen으로 전환됨 PS=photosensitization Sensitizer: Chlorophyll , Riboflavin, Myoglobin, Synthetic colors 1 (O 2)
http: //class. fst. ohio-state. edu/fst 605/605 p/Lipid. Oxidation. pdf
Bond Energy and Lipid Oxidation
Hydroperoxide의 생성 - Monoenoic Acid (Oleic) 이중결합 바로 이웃 탄소의 수소원자 를 떼어내기 반응 Hydroperoxide
CH 3 Hydroperoxide의 생성 - Linoleic acid - 14 (CH 2 )3 CH 2 13 CH 12 11 CH Initiation (metal) CH 3 (CH 2 )3 CH 2 Propagation CH 3 (CH 2 )3 12 . (CH 2 )3 11 CH CH 2 n COOH CH O 12 11 CH CH 10 9 CH CH CH 2 n COOH 10 9 CH CH 10 9 CH 2 n. COOH + H. . CH 2 CH + O 2 O 12 11 CH CH CH - CH 2 n COOH O Hydroperoxide Decomposition CH 3 CH - H. Propagation CH 3 9 10 CH 2 O H CH 2 _ 12 CH CH . OH 11 CH 10 CH 9 CH 2 n COOH O CH 3 (CH 2 )3 . CH 2 O + H C 12 11 10 9 CH CH . Termination + H CH 3 (CH 2 )3 Pentane CH 3 CH 2 n COOH
Hydroperoxide의 생성
Hydroperoxide의 분해 Alkoxy radical Hydoxy radical 지방산 Ketone Aldehyde 비 radical 생성으로 연쇄반응 정지 Ketone Alcohol
Hydroperoxide의 분해 Linoleic acid와 linolenic acid로 부터 유도된 hydroperoxide는 고리 과산화물, malonaldehyde, epoxy 화합물을 생성함.
등온 흡(탈)습 곡선 Zone 1: 단분자층 (monomolecular layer) Zone 2: 다분자층 (mutlimolecular layer) Zone 3: 모세관 응축 영역 (capillary condensation region)
항산화제(Antioxidants) 천연항산화제: - Tocopherol (비타민 E): δ>γ>β>α - Sesamol: 참기름 - Gossypol: 목화씨 - Isoflavone: 콩류 - 허브 및 향신료 - 갈변반응 생성물 합성항산화제: - BHT(butylated hydroxy toluene), BHA (butylated hydroxy anisole) 등
유지의 산패 측정 방법 TBA값(Thiobarbituric acid value): TBA 2분자가 불포화지방산의 산화생 성물인 malonaldehyde 한 분자와 축합하여 붉은 색소를 생성함 (530 nm) 그러나, alkanal, alkenal 등은 TBA와 반응하여 노란색를 생성 (450 nm) Dienal은 붉은 색소 (530 nm)를 생성함 따라서 측정시 450과 530 nm를 둘 다 측정 산화가 진행됨에 따라 TBA값은 계속 증가함. It must be noted that alkenals and alkadienals also react with the TBA reagent and produce a pink color. Thus, the term thiobarbituric acid reactive substances (TBARS) is now used instead of MA.
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- Chromium + oxygen
- Output of electron transport chain
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- Saturation normal
- Principle of winkler's method
- Characteristics definition
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- How many electrons does oxygen have
- Mass of oxygen in water
- Uses of oxygen
- Oxygen ion configuration
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- Dissolved oxygen meaning
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- Wikimedia