• Title/Summary/Keyword: Oxidative stability

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Fatty Acid Composition as a Predictor for the Oxidation Stability of Korean Vegetable Oils with or without Induced Oxidative Stress

  • Yun, Jung-Mi;Surh, Jeong-Hee
    • Preventive Nutrition and Food Science
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    • v.17 no.2
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    • pp.158-165
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    • 2012
  • This study was designed to investigate whether the fatty acid composition could make a significant contribution to the oxidation stability of vegetable oils marketed in Korea. Ten kinds, 97 items of vegetable oils that were produced in either an industrialized or a traditional way were collected and analyzed for their fatty acid compositions and lipid oxidation products, in the absence or presence of oxidative stress. Peroxidability index (PI) calculations based on the fatty acid composition ranged from 7.10 to 111.87 with the lowest value found in olive oils and the highest in perilla oils. In the absence of induced oxidative stress, malondialdehyde (MDA), the secondary lipid oxidation product, was generated more in the oils with higher PI (r=0.890), while the tendency was not observed when the oils were subjected to an oxidation-accelerating system. In the presence of the oxidative stress, the perilla oils produced in an industrialized manner generated appreciably higher amounts of MDA than those produced in a traditional way, although both types of oils presented similar PIs. The results implicate that the fatty acid compositions could be a predictor for the oxidation stability of the vegetable oils at the early stage of oil oxidation, but not for those at a later stage of oxidation.

Blending of Soybean Oil with Selected Vegetable Oils: Impact on Oxidative Stability and Radical Scavenging Activity

  • Li, Yang;Ma, Wen-Jun;Qi, Bao-Kun;Rokayya, Sami;Li, Dan;Wang, Jing;Feng, Hong-Xia;Sui, Xiao-Nan;Jiang, Lian-Zhou
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.6
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    • pp.2583-2589
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    • 2014
  • Background: Soybean oil may protect against cancer of the breast and prostate. It may also exert beneficial influence in combination with other oils. Here, blends (20%, v/v) of sea buckthorn oil (SEBO), camellia oil (CAO), rice bran oil (RBO), sesame oil (SEO) and peanut oil (PEO) with soybean oil (SBO) were formulated. Materials and Methods: Oxidative stability (OS) and radical scavenging activity (RSA) of SBO and blends stored under oxidative conditions ($60^{\circ}C$) for 24 days were studied. By blending with different kinds oils, levels of polyunsaturated fatty acids (PUFA) decreased, while monounsaturated fatty acid (MUFA) content increased. Progression of oxidation was followed by measuring peroxide value (PV), p-anisidine (PAV), conjugated dienes (CD) and conjugated trienes (CT). Results: Inverse relationships were noted between PV and OS at termination of storage. Levels of CD and CT in SBO, and blends, increased with increase in time. The impact of SEO as additives on SBO oxidation was the strongest followed by RBO, CAO, SEBO and PNO. Conclusions: Oxidative stability of oil blends was better than SBO, most likely as a consequence of changes in fatty acids and tocopherols' profile, and minor bioactive lipids found in selected oils. The results suggest that these oil blends could contribute as sources of important antioxidant related to the prevention of chronic diseases associated to oxidative stress, such as in cancer and coronary artery disease.

Effects of Heating Time and Storage Temperature on the Oxidative Stability of Heated Palm Oil (가열시간과 저장온도가 가열팜유의 산화안정성에 미치는 영향)

  • Choe, Eun-Ok
    • Korean Journal of Food Science and Technology
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    • v.29 no.3
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    • pp.407-411
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    • 1997
  • Effects of heating time and storage temperature on the oxidative stability of heated palm oil were studied. Palm oil was heated at $150^{\circ}C$ for 0, 1, 10 or 20 min and stored at 4, 20 or $65^{\circ}C$. The oxidative stability of the sample was evaluated by determining peroxide value of the oil and measuring the volatiles in the headspace of the sample. Significant difference in the peroxide or volatile formation was observed (p<0.05) in heated palm oils between samples stored at 4 or $20^{\circ}C$ and those stored at $65^{\circ}C$. Pentane, hexanal, heptane and total volatiles increased with heating time, while storage temperature did not significantly affect their formation, indicating that heating time played more important role in volatile formation in the heated palm oil than storage temperature. However, adverse results were observed for the formation of peroxide. The interaction effect of heating time and storage temperature on the oxidative stability of heated palm oil was also observed.

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Oxidative Stability and Flavor Compounds of Sesame Oils Blended with Vegetable Oils (식물성유를 첨가한 참기름 혼합유의 산화 안정성과 향기 성분)

  • Joo, Kwang-Jee;Kim, Jin-Ju
    • Korean Journal of Food Science and Technology
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    • v.34 no.6
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    • pp.984-991
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    • 2002
  • Oxidative stability and flavor of sesame oil blended with canola oil (Ca), corn oil (Co), and soybean oil (Sb) at ratios of 90 : 10, 70 : 30, and 50 : 50 (w/w), respectively, were evaluated. Oxidative stability of sesame oil increased with the addition of vegetable oils (10, 30, and 50% of Ca and Co, and 10% of Sb). Pyrazines, pyrroles, pyridines, and thiazoles, good contributors to the characteristic flavor of sesame oil, were also found in sesame oil blended with vegetable oil. The sensory evaluation showed that no difference was observed between sesame oil and sesame oil blended with 10% of Ca, Co or Sb, which showed higher oxidative stability.

Characteristics of browning Materials in Perilla Oil and Change of Oxidative Stability of Blended Perilla Oil (들기름에 존재하는 갈색물질의 특성과 혼합 들기름의 산화 안정성 변화)

  • 김영언;김인환;이영철
    • The Korean Journal of Food And Nutrition
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    • v.9 no.4
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    • pp.504-508
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    • 1996
  • This study was performed to investigate the browning intensity and electron donating ability of browning material in perilla oils from seeds roasted at 150~21$0^{\circ}C$ for 10~30 min. It was also investigated the oxidative stability of the blended perilla oil on the basis of sensory property and oxidative stability. The browning intensity in perilla oil increased with the roasting temperature and time increased. The browning intensity of perilla oil from seed roasted at 21$0^{\circ}C$ for 30 min indicated 13 times higher than that of perilla oil from seed at 15$0^{\circ}C$ for 10 min. Electron donating ability on DPPH of browning materials presented in perilla oils increased with the roasting temperature and time increased. The electron donating ability of browning materials in perilla oil from seed reasted at 21$0^{\circ}C$ for 30 min indicated 3 times higher than those of perilla oil from seed at 15$0^{\circ}C$ for 10 min. In conclusion, for the improvement of oxidative stability of perilla oil, perilla seed should be roasted at 21$0^{\circ}C$ for 30 min. These results suggest that browning materials formed between sugars and amino acids attribute to improve quality of oil such as sensory properties and oxidative stabilities. For the improvement of sensory property and oxidative stability of oil, perilla oil from seed roasted at 19$0^{\circ}C$ for 20 min was blended with the oil from seed roasted at 21$0^{\circ}C$ for 30 min as ratio of 85 : 15.

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Oxidative Stability of Soybean Oil after Frying under the Different Storage Temperature

  • Kim, Youngsung;Choi, Jinyoung;Kwon, Taeeun
    • Culinary science and hospitality research
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    • v.24 no.2
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    • pp.79-86
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    • 2018
  • The purpose of current study was to evaluate the oxidative stability of soybean oil after frying according to storage temperature. The soybean oil after 10 times deep fat frying with potato sticks (10% w/w of oil) were stored during 10 days at 30, 60 and $90^{\circ}C$ and chemical properties were determined. The acid value and peroxide value were the highest and the iodine value were the lowest when the oil stored at $90^{\circ}C$. Expecially, the production rate of peroxide was fast at over $60^{\circ}C$. According to the results, frying oil should not be stored for more than 6 days at $30^{\circ}C$ after use. Since the oil used had already produced unstable peroxides, oxidation could proceed relatively quickly even at low temperatures. Therefore, it is desirable to keep the used oil at a temperature as low as possible.

Synergistic Effect of Tocopherol, Citric Acid and Sodium Polyphosphate on the Oxidative Stability of Heated Frying Oil (가열유지(加熱油脂)의 산화안정성(酸化安定性)에 대(對)한 Tocopheol, 구연산 및 인산염(燐酸鹽)의 상승효과(相乘效果))

  • Chang, Hyun-Ki
    • Journal of the Korean Applied Science and Technology
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    • v.6 no.1
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    • pp.15-19
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    • 1989
  • The oxidative stability of palm oil with moisture addition during heationg was investigated and the antioxidant effects of tocopherol, citric acid and sodium polyphosphate were evaluated. The addition of natural tocopherol up to 200 ppm level did not improve the oxidative stability of palm oil with moisture (1m1 $H_2O$ additive to 200g of oil at $180^{\circ}C$). The maximum antioxidant effect was observed at the Concentration of 400 ppm. Addition of citirc acid did not influence the effective concentration of tocopherol. Whereas addition of sodium polyphosphate and citric acid increased the antioxidant effect of tocopherol. The maximum synergistice effect was observed at the concentrations of 50 ppm citric acid and 50 ppm of sodium polyphosphate. Addition of 50 ppm citric acid and 50 ppm sodium polyphosphate to 100 ppm of tocopherol exceeded the antioxidant effect of 400 ppm tocopherol alone.

Effect of Soybean Lecithin on the Thermal Oxidation of Tocopherol in Blended Oil (혼합유중(混合油中) Tocopherol의 열산화(熱酸化)에 미치는 대두(大豆) Lecithin의 효과(效果))

  • Chang, Hyun-Ki
    • Journal of the Korean Applied Science and Technology
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    • v.10 no.2
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    • pp.1-6
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    • 1993
  • The blended oil was prepared from cottonseed oil and palm olien. The oxidative stability of blended oil after the addition of natural tocopherol and soybean lecithin during heating was investigated and the effects of lecithin were evaluated. The result obtained were as follows: 1. When the concentration of palm olein in blended oil during heating was increased, the oxidative stability was improved. 2. By both addition of natural tocopherol and soybean lecithin during heating in blended oil, induction period was considerably increased and residual ratio of tocopherol was high. 3. The oxidative stability of potato chips prepared from blended oil was higher in the prsence of lecithin than in the absence of it.

Oxidative Stability of Tocopherols on Korean Sesame oil and chinese Sesame oil (한국산 참깨기름과 중국산 참깨기름의 토코페롤 산화안정성)

  • 신묘란;주광지
    • Journal of the East Asian Society of Dietary Life
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    • v.4 no.2
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    • pp.51-57
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    • 1994
  • Six sesame oils prepared from Korean and Chinese sesame were oxidized at 40$^{\circ}C$ for 16 weeks in a dark place. Effects of oxidative stability on tocopherols of those sesame oils were studied in related to chemical changes in the oils. All oil samples showed that the rate of tocopherol reduction was increased by the storage time. The changes of peroxide value, free fatty acid, carbonyl content were not caused in direct relation to the tocopherols oxidation. The amount of total tocopherol in the Korean sesame oil ranged from 48.7-50.3mg/100g and Chinese seseame oil ranged from 42.4-44.7 mg/100g According to the three individual tocopherols remaining content after 16weeks, ${\gamma}$-,${\alpha}$-,${\beta}$- tocopherol showed 70%, 30%, 20% of initial concentrations in the oils respectively. There was no significant difference between Korean and Chinese sesame oil except the higher total amount of the tocopherol in Korean sesame oil than that of Chinese.

Effect of Glutamic Acid and Monosodium Glutamate on Oxidative Stability of Riboflavin Photosensitized Oil-in-Water Emulsion

  • Ji-Yun Bae;Mi-Ja Kim
    • The Korean Journal of Food And Nutrition
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    • v.37 no.1
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    • pp.48-56
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    • 2024
  • Effects of glutamic acid (Glu) and monosodium glutamate (MSG) on oxidative stability of oil-in-water (O/W) emulsions with different emulsifier charges during riboflavin (RF) photosensitization were evaluated by analyzing headspace oxygen content and conjugated dienes. Cetyltrimethylammonium bromide (CTAB), Tween 20, and sodium dodecyl sulfate (SDS) were used as cationic, neutral, and anionic emulsifiers, respectively. Glu acted as an antioxidant in CTAB- and Tween-20-stabilized O/W emulsions during RF sensitization, whereas Glu acted as prooxidants in SDS-stabilized O/W emulsions in the dark. However, adding MSG did not have a constant impact on the degree of oxidation in O/W emulsions irrespective of the emulsifier charge. In RF-photosensitized O/W emulsions, the emulsifier charge had a greater influence on antioxidant properties of Glu than on those of MSG.