Jae Hwan Lee

Two types of oleogels—made of carnauba wax with canola oil or beeswax with grapeseed oil—were prepared at concentrations from 0 to 15% (w/w) of wax. Physical characterization was done and oxidative stability of the oleogels were evaluated. As the proportion of wax increased from 5 to 15%, the enthalpy of crystallization and melting increased in both oleogels. The carnauba wax-based oleogel (CWO) required greater enthalpy than the beeswax-based oleogel (BWO). Differences in L*, a*, and b* values

Volatile compounds from linoleic acid with or without added 5 ppm chlorophyll under light and in the dark were studied by headspace-solid phase microextraction (HS-SPME)-gas chromatography (GC)-mass spectrometry (MS). Coefficient of variation (R2) for the total peak areas by HS-SPME was 1.8%. Total volatiles (TI) in linoleic acid without added chlorophyll under light and in the dark were not significantly different for 48 hr at 4℃ (p>0.05). TI in linoleic acid with 5 ppm chlorophyll under light

Solid fat was developed by blending fullyhydrogenated soybean oil, palm oil, and canola oil, andorganogels were prepared using selected solid fats andethylcellulose. The oxidative stability of organogel wastested at 100 and 180oC using a headspace oxygen assay. Addition of ethylcellulose produced a firmer organogelsolid state in selected solid fats ranging from 15.8 to 24.6%saturation at room temperature. Addition of ethylcellulosegenerally decreased the oxidative stability of organogelsprepared

Radical scavenging activity of ethanol extracts from ssuk (Artemisia princeps Pampan.) was determined by 2,2-diphenyl-1-pycryl-hydrazil (DPPH) and 2,2'-azinobis(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) methods. Also, anti-obesity effects of ssuk extract were tested in vitro using 3T3-L1 preadipocyte cells. Total phenolic contents of ssuk extract were 42 μM tannic acid equivalent/mg and EC50 of ssuk extract for scavenging DPPH and ABTS radicals were 2.02 and 1.03 mg/mL, respectively. Triacy

Antioxidant or prooxidant activity of β-carotene was studied in autoxidized or methylene blue photosensitized lard using the depletion of headspace oxygen, p-anisidine value (p-AV), or a modified DPPH methods. β-Carotene of 1.25 and 2.50 μM significantly decreased headspace oxygen and β-carotene from 0.25 to 2.50 μM increased significantly p-AV in lard oxidized at 60oC for 60 h (p<0.05), implying β-carotene acted prooxidantly. β-Carotene under 0.25 μM in oxidized lard did not decrease the absorb

Pale ale류에 속하는 수입산 시판 맥주 3종과 신제품 맥주를 대상으로 일반적 품질특성과 향기패턴 및 맛의 성향을 비교하였다. 그 결과 신제품은 4.35%의 알콜 함량을 나타냈으며 B.U.는 3.5, 색도는 34.43(EBC), sweetness는 2.28oP, pH는 3.96, 총산은 5.21, 폴리페놀은 181.22 mg/L의 함량을 보였다. 전자코에 의한 향기패턴의 경우 시판 맥주와는 구분되어 다른 향기특성을 갖는 것으로 나타났으며, GC를 이용한 총 14종의 휘발성분 중 ethyl acetate, isobutanol, isoamyl acetate, isoamyl alcohol, ethyl hexanoate 함량의 차이를 보였고 그 외 물질들은 시판 맥주와 유사한 것으로나타났다. 전자혀 분석에서는 시판 맥주에 비하여 NB의 신맛이부족한 것으로 나타났으며 맥주의 주요한 쓴맛을 나타내는 성분중 하나인 quinine을 정량 한 결과 시판 맥주에서의 농도는 1.5- 1.8 mg/L

Reactivity of 2,2-diphenyl-1-picrylhydrazyl(DPPH) radical in methanol, ethanol, isopropanol, isooctane,and ethyl acetate, was evaluated to assess theantioxidant capabilities in medium chain triacylglycerol. DPPH loss values were obtained over 30 min, with samplingevery 5 min. Even the same concentration ofantioxidants showed different DPPH reactivity dependingon solvent. In methanol, 5 min was enough for a-tocopherolto react with DPPH, whereas BHT did not react withDPPH even after 30 min. Gallat

Background It has not been determined whether changes in serum uric acid (SUA) level are associated with incident metabolic syndrome (MetS). The aim of the current study was to investigate the relationship between changes in SUA level and development of MetS in a large number of subjects. Methods In total, 13,057 subjects participating in a medical health check-up program without a diagnosis of MetS at baseline were enrolled. Cox proportional hazards models were used to test the independent asso

Colon cancer is a leading cause of cancer-related deaths worldwide. Effects of walnut (Juglans regia L.) lipid extracts (WLEs) on the self-renewal capacity of cancer stem cells (CSCs) in colon cancer were investigated. The dominant component of WLEs was α-linoleic acid (64.6%), followed by α-linolenic acid (14.6%), and oleic acid (12.6%). A higher concentration of γ-tocopherol (37.1%) was also present than of α-tocopherol (0.6%). CD133+CD44+CSCs treated with WLEs showed inhibition of colony form

The oxidative stability in oil-in-water (O/W) emulsions containing different emulsifiercharges was tested under riboflavin photosensitization by analysis of headspace oxygen content andlipid hydroperoxides. Sodium dodecyl sulfate (SDS), Tween 20, and cetyltrimethylammonium bromide(CTAB) were selected as anionic, neutral, and cationic emulsifiers, respectively. The O/W emulsionscontaining CTAB had lower oxidative stability than those with SDS and Tween 20. The addition ofethylenediaminetetraaceti

a-Tocopherol is known to show different activity depending on the concentration and food matrix. Effects of a-tocopherol at the concentrations of 0, 0.1, 0.5, and 1.0 mM were determined in oil-in-water (O/W) emulsions containing anionic, neutral, and cationic emulsifiers under different types of oxidative stress including riboflavin photosensitization, photooxidation, and autoxidation. Headspace oxygen depletion, lipid hydroperoxides, and conjugated dienes were analyzed to determine the oxidativ

Distributions of volatiles and fatty acids from thermally oxidized free fatty acids (FFA) at 93℃ for 200min were analyzed and results were statistically compared using principal component analysis (PCA) and multiple factor analysis (MFA). Mixtures of FFA were composed of linoleic (57.54%), oleic (29.99%), linolenic (5.10%), palmitic (2.95%), stearic (0.26%), and arachadic (1.68%) acids. As thermal oxidation increased for 200 min, peak areas of total volatiles increased from 0.497 to 1.619 (1×107

Volatiles in Artemisia princeps Pampan. cv. sajabal (sajabalssuk) and A. princeps Pampan. (ssuk) treated with different processing were analyzed using headspace-solid phase microextraction (HS-SPME)/gas chromatography- a mass selective detector (GC-MS). Sajabalssuk and ssuk were treated with steam distillation (SD) and freeze-dried/steam distillation (FD/SD) while controls were raw sajabalssuk and raw ssuk. Sajabalssuk had significantly more total volatiles than ssuk in control and FD/SD treated

Absorbance of DPPH in isooctane has been developed to determine the degree of lipid oxidation and antioxidant capacities in lipid systems. Lard with or without addition of sesamol, a free radical scavenger, was thermally oxidized and absorbance of DPPH in isooctane,conjugated dienoic acid (CDA) values, p-anisidine value (p-AV), and sesamol content were analyzed. Changes of DPPH absorbance in early stages of oxidation were highly correlated to the decrease of sesamol content. In later stages of l

Effects of riboflavin photosensitization on the distribution of isoflavones in commercially available soymilk were analyzed using high-performance liquid chromatography (HPLC). Total isoflavones (TI) in soymilk with riboflavin (1000 ppm, w/v) under light were significantly different from those stored in the dark for 24 h (P < 0.05), while TI in samples with 0 and 1000 ppm added riboflavin were not significant from each other in dark conditions (P > 0.05). To test the effects of the concentration