• Nutritional Sciences
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• 제9권1호
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• pp.48-54
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• 2006

Methods have been developed to evaluate the total antioxidant capacity of foods and plasma but limitations are associated with their ability to determine precisely the contribution of lipophilic antioxidants in a lipid milieu as well as interactions among them Thus, we modified the Oxygen Radical Absorbance Capacity (ORAC) assay to determine the peroxyradical scavenging ability of both hydrophilic and lipophilic compartments in plasma The hydrophilic ORAC assay was performed in a phosphate buffer system utilizing 2,2'-azobis (2-amidinopropane) dihydrochloride as a peroxyradical generator and fluorescein as the target The lipophilic ORAC assay was carried out in a dimethylsulfoxide :butyronitrile (DMSO/BN, 9:1 v/v) system using 2,2'-azobis (2,4-dimethyl valeronitrile) as a peroxyradical generator and BODIPY C11 581/591 as the target Analyses were conducted in bovine serum supplemented with water - and lipid - soluble antioxidants and in human plasma. Albumin (0.5$\sim$5 g/dL) and uric acid (0.1$\sim$0.5 $\mu$mol/L) increased hydrophilic ORAC values in a dose-dependent fashion ($R^{2}$=0.97 and 0.98, respectively) but had no impact on lipophilic ORAC values. $\alpha$-Tocopherol (15$\sim$200 $\mu$mol/L) increased lipophilic ORAC values in a dose-dependent fashion ($R^{2}$=0.94); neither $\alpha$-tocopherol nor $\beta$-carotene had an impact on hydrophilic ORAC values. However, addition of $\beta$-carotene at physiological concentration (0.23$\sim$1.86 $\mu$mol/L), either alone or in combination with other carotenoids, had no significant impact on lipophilic ORAC values. Thus, while assays of 'total antioxidant capacity' in biological matrices would be a useful research and clinical tool, existing methods are limited by the lack of complete responsiveness to the full range of dietary antioxidants.

• Journal of Plant Biotechnology
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• 제41권4호
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• pp.169-179
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• 2014

세포내에는 비효소적 반응으로 활성산소류를 제거하는 소분자의 항산화 물질과 과산소와 하이드로페록사이드를 분해하는 효소들이 존재한다. 항산화 시스템은 자유라디칼과 활성산소류를 제거함으로써 산화스트레스로부터 세포 구성요소들을 보호하는 역할을 한다. 비효소적 항산화 물질은 지용성과 친수성이 있는데, 지용성 물질들은 세포막에 위치하며 과산화지질이 형성되는 반응을 억제한다. 카로테노이드와 비타민E, $CoQ_{10}$은 세포 내에서 주요 지용성 항산화 물질로써, 이들이 대량으로 축적된 주요 작물의 개발은 영양학적 가치가 높은 식품을 생산할 수 있다. 본 총설에서는 식물에서 카로테노이드와 비타민E, $CoQ_{10}$의 생합성 경로와 대사공학을 이용한 영양강화 연구 현황을 기술하였다.

• Nutritional Sciences
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• 제6권1호
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• pp.12-19
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• 2003

The measurement of the total antioxidant capacity (TAC) of human plasma has been widely applied in nutritional science, for example to evaluate the antioxidant contribution of dietary components and to study, although indirectly, the bioavailability of dietary antioxidants. Several methods have been proposed for the measurement of TAC, most of them based on the ability of plasma to withstand the oxidative damage induced by aqueous radicals. Although plasma contains both hydrophilic and lipophilic antioxidants that interact through extensive cross-talk in most of the methods employed for the TAC measurement, the hydrophilic antioxidants such as ascorbic acid, uric acid, and protein thiols mainly contribute to the total antioxidant plasma capacity (almost 70%) while lipophilic antioxidants embedded in the lipoproteins (carotenoids, a-tocopherol, ubiquino1-10) participate only in a negligible amount (less than 5%). The present paper reviews the analytical methods used to assess the TAC and in particular focuses on new approaches that are capable of distinguishing the antioxidant capacity of both the aqueous and lipid compartments of plasma. The general principle of the method as well as some in vitro and ex vivo applications will be discussed within the text.

• 한국영양학회:학술대회논문집
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• 한국영양학회 2001년도 춘계연합학술대회 초록
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• pp.144.1-144
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• 2001

• 한국식품과학회지
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• 제31권4호
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• pp.1077-1083
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• 1999

다른 유지상(bulk, oil-in-water)에 친수성 항산화제로서 gallic acid를 소수성 항산화제로서 ${\delta}-tocopherol$을 처리하고, HLB(hydrophilic lipophilic balance)에 따른 유화제를 처리하여 기질의 차이에 따른 항산화제와 유화제가 유지의 산화안정성에 미치는 정도를 실험하였다. 유지는 정제하지 않은 콩기름을 사용하였고 bulk상에서 12일 경과시 gallic acid를 첨가한 처리구의 유도기간이 Rancimat method로 측정시 4.13인데 비해 ${\delta}-tocopherol$을 첨가한 처리구의 유도기간은 1.18로 친수성 항산화제를 처리한 것이 3배 정도의 유지산화지연효과를 보였다. 또한 유화제의 처리에 있어서는 lecithin을 처리한 것의 유도기간이 5.07로 tween 20 처리 2.23, span 60의 경우 2.9인것에 비해 산화안정성면에서 우수하였다. 이와 같은 결과는 과산화물가와 공액이중산함량에서도 같은 경향을 보였다. Emulsion상(oil-in-water)에서도 bulk상과 같은 경향을 보였으며 이것은 emulsion상에 소수성 항산화제를 처리한 것이 유지 산화안정성면에서 더 효과적이라는 결과와는 차이가 있는데 기질의 차이, 즉 정제하지 않은 시판 콩기름을 사용한 것에 의한 차이인 것 같다. Emulsion상에서 유지방구의 크기는 저장하면서 모든 처리구에서 작아지는 경향을 보였으며, 이것은 유지방구의 크기가 작아지면서 표면적이 증가하고 따라서 공기와 접하는 면이 커지게 되므로 유지상은 안정해지나 산화는 더 촉진되므로 상의 안정과 산화안정성의 적절한 설정기준이 필요할 것으로 보인다.

• 대한핵의학회지
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• 제26권1호
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• pp.133-139
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• 1992

To improve the quality of $^{99m}Tc-methylenediphonate$ $(^{99m}Tc-MDP)$ for skeletal imaging, different composed $^{99m}Tc-MDP$ complexes were prepared with addition of antioxidants such as ascorbic acid, getisic acid, and p-aminobenzoic acid. To characterize the different $^{99m}Tc-MDP$ preparations, some physical and biochemical properties of $^{99m}Tc-MDP$ such as thermal stability, lipophilicity and bindability to serum protein were studied and organ distribution pattern of these complexes also compared. The thermal stabilities of $^{99m}Tc-MDP$ contained antioxidants were dependant mainly on pH, temperature, and elapsed time after the preparation. $^{99m}Tc-MDP$ complex contained gentisic acid as antioxidant was extremely unstable at alkaline condition. The most stable $^{99m}Tc-MDP$ was found in the presence of p-aminobenzoic acid. $^{99m}Tc-MDP$ complexes with antioxidants were very lipophilic but lipophilicity differences in antioxidants were not observed. The bindability of $^{99m}Tc-MDP$ to serum protein was not affect at pH $5.0\sim9.0$ by the different antioxidants. However, protein binding percentage of $^{99m}Tc-MDP$ with ascorbic acid was relatively low (22.7%) at pH 9.0. In biodistribution studies in mice, bone to muscle ratios of $^{99m}Tc-MDP$ preparations containing ascorbic acid, gentisic acid, and p-aminobenzoic acid were 15.3, 24.5, and 30.1, respectively. Im to our results, p-aminobenzoic acid is fond to be the most promising antioxidant.

• Journal of Ginseng Research
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• 제22권1호
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• pp.1-10
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• 1998

In the present study, to determine whether the antioxidative components of Korean red ginseng protect against radiation damage and the possible relationship among the radioprotective effects and antioxidant actions, the effects of total saponin (200 mg/kg, ip) and lipophilic fraction (200 mg/kg, oral) preferment of mice on the survival ratio, major antioxidant enzymes (SOD, catalase and glutathione peroxidase) activities, glutathione levels and lipid peroxidation in the liver were exiled for 2 weeks after whole ${\gamma}$-body ${\gamma}$-irradiation (6.5 Gy). The 30-day survival ratio increased from 10% to 57% and 40% for mice treated with total saponin and lipophilic fraction, respectively. On day 14 after ${\gamma}$-irradiation, the ginseng total saponin pretreatment produced a slight increase of antioxidant enzymes activities and significantly Increased reduced glutathione (GSH) contents (p<0.05) in the liver compared with non-treated group. Pretreatment with ginseng total saponin significantly deceased GSSG/total GSH ratio (p<0.05) without change of GSSG in the liver and inhibited the radiation-induced incense in the hepatic malondialdehyde levels. (p<0.05) In these results, GSH plays an important role in the liver in several detoxifications and the reduction of lipid peroxides. Thus, it appears that total saponin of red ginseng exerts its radioprotective effect by accelerating the production of endogenous antioxidants, such as glutathione from radiation induced damages and thereby oxygen free radicals.

• Journal of Ginseng Research
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• 제23권3호
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• pp.182-189
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• 1999

본 연구에서 홍삼의 항산화 효과를 알아보기 위하여 생쥐에 홍삼의 총사포닌 분획, 수용성 추출물, 알코올 추출물, 지용성 분획과 ascorbic acid를 투여(200mg/kg/0.1ml)한 후 paraquat(PQ) 100mg/kg을 복강투여 하였을 때 활성산소 라디칼의 생성을 촉진시킨 후 간에서 $H_2O_2$ 함량, SOD, catalase, GP의 량을 측정한 결과 총사포닌 투여군을 제외한 홍삼추출물 투여 후 PQ투여군 치가 PQ 단독 처리군에 비하여 $H_2O_2$ 생성량이 유의성(p<0.01) 있게 감소 억제되었다. 한편 항산화효소의 활성은 PQ단독 처리군에 비하여 SOD는 홍삼추출물 투여 모든 군에서 유의성있는 증가를 하였고, catalase는 수용성 추출물과 지용성 분획 투여군에서 증가하였으며, CP는 지용성 분획에서 유의성(p<0.01)있는 증가를 보였다. 그리고 지질과산화에서 PQ처리는 지질과산화 경향 MDA량이 증가되는 것을 볼 수 있었고, 홍삼추출물 투여는 PQ단독 처리군에 비하여 지질과산화 경향에서 MDA량은 억제되는 경향을 보였다.

• 한국식품조리과학회지
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• 제14권5호
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• pp.560-565
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• 1998

The purpose of this study was to investigate any differences in the efficiency of various antioxidants for the three types of substrates such as corn oil in water (O/W) emulsion, water in com oil (W/O) emulsion, and bulky corn oil. ${\alpha}$-Tocopherol (${\alpha}$-Toc) at 0.01 or 0.02%, ascorbic acid (AsA), ascorbyl palmitate (AP), and BHT at 0.02% were added separately to the prepared O/W emulsion, W/O emulsion, and bulk oil, and their antioxidative effects were compared. The mixture of ${\alpha}$-Toc ind AsA or AP at the level of 0.02% also was tested to observe any synergistic effect. Oxidation was made by storing at 42${\pm}$1$^{\circ}C$ for 25 days and the oxidative stability was determined by peroxide value and conjugated dienoic acid with time fluctuation of storage. The results were as follows: 1. In case of O/W emulsion, the order of antioxidative effect was AP> ${\alpha}$-Toc+AP>${\alpha}$-Toc+AsA>AsA>BHT. 2. In case of W/O emulsion, the order of antioxidative effect was AsA>AP>${\alpha}$-Toc+AsA>BHT. ${\alpha}$-Toc+AP mixture showed the prooxidant effect rather than synergistic effect. 3. In case of bulk oil, the order of antioxidative effect was AsA>AP>${\alpha}$-Toc+AsA>${\alpha}$-Toc+AP\ulcornerBHT. Therefore, AsA, a hydrophilic antioxidant, was more effective in W/O emulsion system than in O/W emulsion system, while the opposite trend was found in AP, a lipophilic antioxidant. AsA, a hydrophilic antioxidant, was more efficient in bulk oil of anhydrous substrate. ${\alpha}$-Toc showed prooxidant effects in all substrates.

• 한국식품위생안전성학회지
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• 제32권5호
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• pp.424-433
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• 2017

본 연구에서는 식품용 기구 및 용기 포장으로부터 식품유사용매로 이행되는 10종의 산화방지제(butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), Cyanox 2246, 425 and 1790, Irgafos 168, 및 Irganox 1010, 1330, 3114 and 1076)의 분석법을 확립하였다. 식품유사용매 중 물, 4% 초산, 50% 에탄올의 경우 hydrophiliclipophilic balance (HLB) 카트리지로 고체상 추출(SPE, Solid Phase Extraction)을 하였고, n-헵탄의 경우 이소프로필알콜로 희석하여 HPLC-UVD (276 nm)로 산화방지제의 이행량을 분석하였다. 확립된 분석법으로 위생백, 지퍼백, 우유팩, 주스팩, 가공식품용 포장지, 밀폐용기, 일회용기 등 국내 유통 폴리에틸렌(78건) 및 폴리프로필렌(122건) 재질의 식품용 기구 및 용기 포장 200건으로부터 식품유사용매로 이행되는 10종의 산화방지제 이행량 조사 결과, 총 78건의 폴리에틸렌 식품용 기구 및 용기 포장 중 5건에서 Irganox 1010이 ND~1.444 mg/L 검출되었고, 총 122건의 폴리프로필렌 식품용 기구 및 용기 포장 중 41건에서 Irganox 1010이 ND~3.106 mg/L, 28건에서 Irganox 1076이 ND~4.752 mg/L, 34건에서 Irgafos 168이 ND~3.635 mg/L 검출되어 총 3종의 산화방지제가 검출되었다. 검출된 Irganox 1010, Irganox 1076, Irgafos 168에 대해 일일추정섭취량(EDI)을 계산하고 일일섭취한계량(TDI)과 비교하여 위해도를 평가한 결과, 폴리에틸렌 재질 중 Irganox 1010은 TDI 대비 0.0067%, 폴리프로필렌 재질 중 Irganox 1010, Irganox 1076, Irgafos 168은 TDI 대비 0.0073%, 0.1800%, 0.0200%로 안전한 수준임을 확인하였다. 본 연구에서 확립된 폴리에틸렌 및 폴리프로필렌 식품용 기구 및 용기 포장 중 산화방지제 분석법 및 안전성 평가 결과는 앞으로 기구 및 용기 포장의 안전관리를 위한 과학적인 근거자료로 활용될 것으로 판단된다.