PC12 neuronal cell-protective effects of hot water extracts of guava fruit and leaf were evaluated. Total phenolic levels in fruit and leaf were 11.75 and 293.25 mg/g, respectively. Gallic acid, the predominant phenoic, was detected in both extracts. Intracellular reactive oxygen species (ROS) accumulation after $H_2O_2$ treatment was significantly reduced when the hot water extract of guava leaf was added to cell medium, compared to PC12 cells treated with $H_2O_2$ only. In a cell viability assay using 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyl- tetrazoliumbromide (MTT), the hot water extracts of fruit and leaf protected against $H_2O_2$-induced neurotoxicity. The leaf extract was more effective in terms of inhibition of lactate dehydrogenase (LDH) release into medium, compared to the fruit extract. These in vitro data suggest that hot water extracts of guava fruit and leaf may be useful in treatment of neurodegenerative conditions such as Alzheimer's disease.
In this study, 80% ethanolic extracts of tartary and common buckwheats were assessed for their total phenol content, total flavonoids content, antioxidant activity (DPPH, ABTS radical scavenging activity and reducing power), and anti-adipogenic effects. Our results show that total phenol contents of 80% ethanolic extract from tartary and common buckwheats were $17.35{\pm}0.41$ and $8.20{\pm}0.28\;{\mu}g$ GAE/g, respectively. Antioxidant activities of 80% ethanolic extract from tartary buckwheat were significantly higher than that of common buckwheat extract (p<0.05). During adipocyte differentiation, 80% ethanolic extracts of tartary and common buckwheat significantly inhibited lipid accumulation compared to control cells. We further evaluated the effect of buckwheat extracts on the changes of key gene expression associated with 3T3-L1 adipogenesis and ROS production. Tartary buckwheat extract was more suppressed the mRNA expressions ($PPAR{\gamma}$ and aP2) than that of common buckwheat extract. Moreover, tartary buckwheat inhibited the mRNA expression of both NOX4 (NADPH oxidase 4) and G6PDH (glucose-6-phosphate dehydrogenase). These results indicate that anti-adipogenesis effect of tartary buckwheat can be attributed to phenolic compound that may potentially inhibit ROS production.
To develop a new functional kimchi with antioxidative properties, salted baechu was soaked in black rice water extract for 6 h at room temperature. The antioxidative property of the water extract was $78.75{\pm}1.18%$ that of the control (0.1% [w/v] alpha-tocopherol). The black rice gel was added to the baechu kimchi preparation. The color of baechu kimchi treated with black rice water extract changed to dark violet and/or black. Control kimchi and black rice water-treated kimchi were stored at $4^{\circ}C$ for 30 days. No significant differences were detected between the control and the black rice water-treated group in the early stages of fermentation. As fermentation time increased, pH decreased and titratable acidity increased rapidly in control kimchi. However, such marked changes were not evident in test kimchi. The hardness value of black rice water-treated kimchi was higher than that of control kimchi after the midpoint of the fermentation period. The storage life of baechu kimchi treated with black rice water extract was prolonged by up to 5 days compared with control samples, owing to a decline in lactic acid bacteria and yeast levels during the final fermentation period in black rice water-treated kimchi. The total phenolic levels and the antioxidative capacity of black rice water-treated kimchi (83%) were approximately 1.5-fold higher than in control kimchi (57%). In sensory evaluation, black rice water-treated kimchi scored higher than did control kimchi using a blind test protocol.
Kim, Jeung-Hoan;Lee, Soo-Yeon;Park, Jung-Mi;Park, Joo-Hoon;Kwon, O-Jun;Lee, Jin-Young
Food Science and Preservation
/
v.21
no.3
/
pp.396-403
/
2014
In this study, the antioxidant effect of water and ethanol extracts from Juniperus rigida Sieb were investigated. The activities of each of the extracts were measured based on their total phenolic and flavonoid contents and using antioxidant test such as of 2,2-azinobis (3-ethyl benzothiazoline-6-sulfonic acid (ABTs) radical scavenging activities, ferric reducing antioxidant power (FRAP), angiotensin I converting enzyme (ACE) inhibition activity, antioxidant protection fator (PF), thiobarbituric acid reactive substances (TBARs) content, and ${\alpha}$-glucosidase and ${\alpha}$-amylase inhibition activity assay. The result of the examination to measure the polyphenol content by investigating the antioxidativity of the J. rigida Sieb. extract showed 71.3 mg/g polyphenol content in the water extract, and 116.0 mg/g in the ethanol extract and a 17.7 mg/g flavonoid content in the water extract and in 76.4 mg/g in the ethanol extract. The ABTS radical cation decolorization showed 76.4% and 79.3% scavenging activities of the $500{\mu}g/mL$ water extract and ethanol extract, respectively. The FRAP showed 1.83 mM efficacy in the water extract and a lower 1.77 mM in ethanol extract. Both the water extract and the ethanol extract showed reduced ACE activities of 75.39% and 71.25% at $500{\mu}g/mL$, respectively. The antioxidant protection factor of the water and 70% ethanol extracts of J. rigida Sieb were 1.5 PF and 2.1 PF, respectively. In the TBARS inhibitory activity, the extracts showed 55.78% and 71.48% antioxidant activities at the $500{\mu}g/mL$ concentration. The results of the measurrement of the ${\alpha}$-amylase inhibitory activity indicated more than 90% of activity inhibition in the $500{\mu}g/mL$ concentration of the ethanol extract. For the ${\alpha}$-glucosidase inhibitory activity, the ethanol extract showed 70% activity inhibition at the $500{\mu}g/mL$ concentration.
Naringin has antioxidant and antihyperlipidemic properties, however, phenolic compounds including naringin are unstable in the presence of light, heat and oxygen. Beta-cyclodextrin ($\beta$-CD) is a cyclic heptamer composed of seven glucose units that enhances the stability and solubility of molecules through the formation of inclusion complexes. This study was conducted out to compare the effects of CD-naringin (CD-N) inclusion complexes with naringin on lipid metabolism in high fat-fed animals. Male C57BL/6 mice were fed either CD-N (0.048%, w/w) or naringin (N, 0.02%, w/w) in a 20% high-fat (HFC, 15% lard, 5% corn oil, w/w) diet for 10 weeks. Orlistat (Xenical, 0.01%, w/w) was used as a positive control (PC). There were no differences in body weight, food intake, liver and heart weights, plasma triglyceride(TG), leptin, adiponectin, resistin, IL-$1{\beta}$ and IL-6 concentrations, and hepatic $\beta$-oxidation, carnitine palmitoyl transferase(CPT), glucose-6-phosphate dehydrogenase (G6PD) and malic enzyme activities between the HFC and CD-N groups or between the HFC and N groups. However, both CD-naringin and naringin supplementation les to a significant reduction in the epididymal and perirenal white adipose tissue weights, plasma free fatty acid, insulin and blood glucose concentrations, hepatic cholesterol and TG contents and hepatic fatty acid synthase (FAS), phosphatidate phosphohydrolase (PAP) and HMG-CoA reductase activities compared to the HFC group. The plasma HDL-cholesterol concentration was significantly higher in CD-N and N groups than in HF and PC groups. These results indicate that both CD-naringin and naringin supplementation effectively improved plasma and hepatic lipid metabolism without differences between CD-N and naringin groups.
Journal of the Korean Society of Food Science and Nutrition
/
v.41
no.5
/
pp.598-604
/
2012
Four types of mixed citrus and carrot juice (CCJ) were prepared with citrus-pressed juice and cake, and carrot-pressed juice. Their physicochemical properties and antioxidative activities were investigated. The four types of juices were created using different ratios of citrus-pressed juice, carrot-pressed juice, citrus-pressed cake, and additives. The mixing ratios of the four CCJ were as follows (all ratios given in the order of citrus-pressed juice : carrot-pressed juice : citrus-pressed cake : additives; 70:30:0:0 for CCJ-1, 65:30:0:5 for CCJ-2, 65:30:5:0 for CCJ-3, and 60:30:10:0 for CCJ-4. Acidity was low in CCJ-3 and -4 at 0.82 and 0.80, respectively, compared with 0.95 in CCJ-1. The fructose, glucose, and sucrose content was 2.11~5.76 g/100 g, 1.20~2.75 g/100 g, and 3.00~4.21 g/100 g, respectively. Total phenolic content was 1.17 and 1.22 times high as 863 and 898 mg% in CCJ-3 and -4, respectively, compared with 735 mg% in CCJ-1. DPPH radical scavenging activities of methanol extracts of CCJ-3 and -4 were 3.05 and 3.29 times as high as 58.7% and 63.3%, respectively, compared with 19.2% in CCJ-1. Superoxide anion scavenging activities were also 1.67 and 1.80 times higher in CCJ-3 and -4 than that of CCJ-1. Inhibition of NO production in methanol extracts of CCJ-4 were 1.15 and 1.57 times as high as 20.9% and 28.5%, respectively, compared with 18.2% in CCJ-1. Based on the sensory evaluation, CCJ-3 was more preferable in terms of color, flavor, taste, and overall preference than CCJ-1, -2, and -4. It was concluded that CCJ-3 made with 65% citrus-pressed juice, 30% carrot-pressed juice, and 5% citrus-pressed cake were high in antioxidative activity and the inhibition of NO production, and more preferable in terms of sensory attributes.
Journal of the Korean Society of Food Science and Nutrition
/
v.37
no.8
/
pp.965-971
/
2008
The antioxidant activities of hot water and ethanol extracts from fresh, steamed and black garlic were compared. The levels of phenolic compounds of extracts from fresh, steamed and black garlic were $0.81{\sim}0.99\;mg$/100 g and their contents were not significantly different. The contents of flavonoids in ethanol extracts, $0.96{\pm}0.05{\sim}1.06{\pm}0.09\;mg$/100 g, was higher than hot water extracts. DPPH radical scavenging activity was higher in ethanol extract. Although the highest level was $69.40{\pm}0.13%$ in concentration of 10 mg/mL from black garlic ethanol extract, ethanol extracts showed $50.55{\pm}1.40%$ in concentration of 15 mg/mL. Reducing power was significantly higher in black garlic extract and higher in the order of black garlic> fresh garlic> steamed garlic in ethanol extract. Hydroxyl radical scavenging activity was higher in ethanol extract, showing over 60% in concentration of 5 mg/mL. In oil emulsion, TBA value was significantly lower in hot water extracts from black garlic, however ethanol extracts were not significantly different. TBA value of ethanol extract were $1.49{\pm}0.08{\sim}2.11{\pm}0.16\;MA\;mg/kg$ and $1.33{\pm}0.18{\sim}1.62{\pm}0.19\;MA\;mg/kg$ from steamed and black garlic, respectively. Antioxidant activity to the linoleic acid was $72.71{\pm}2.17{\sim}88.74{\pm}3.70%$ in 1-day storage, but its level was increased at 4-day storage to $86.67{\pm}3.76{\sim}92.50{\pm}0.87%$.
Journal of the Korean Society of Food Science and Nutrition
/
v.46
no.1
/
pp.68-76
/
2017
Antioxidative capacities of Stachys sieboldii MIQ and 6-year-old ginseng powder were assessed after extraction with 80% ethanol, and their addition effects on quality characteristics of cookies were determined. Stachys sieboldii MIQ showed 3.12-fold higher total phenol content (TPC) and higher antioxidative capacities than ginseng based on higher values of 2,2-diphenyl-1-picrylhydrazyl radical scavenging capacity, ferric reducing antioxidant capacity, and Trolox equivalent antioxidant capacity (P<0.05). The 80% ethanol extract was then fractionated with $H_2O$ (Fr. I), 30% (II), 50% (III), 70% (IV), and 100% ethanol (V). Fractions of Stachys sieboldii MIQ extract showed 2.2-fold (Fr. I)~6.1-fold (III) higher TPC and higher antioxidative capacities than ginseng extract fractions. TPC was in the order of fractions III> II> I> IV> V for Stachys sieboldii MIQ extract while in the order of fractions I~III> IV~V for ginseng extract, assuming that Stachys sieboldii MIQ contained more phenolic compounds with higher polarity than ginseng. Addition of 5% and 10% Stachys sieboldii MIQ and ginseng powder increased spread ratio in cookies compared to 100% wheat flour, and 10% addition of Stachys sieboldii MIQ resulted in the darkest and most reddish cookies. In the sensory evaluation, cookies with 5% and 10% Stachys sieboldii MIQ received higher scores for taste preference and higher overall acceptability than ginseng or control cookies. Therefore, powder of Stachys sieboldii MIQ could impart more favorable sensory characteristics as well as higher antioxidative capacity than ginseng in bakery products.
Won, Beom Young;Shin, Ki Young;Ha, Hyun Jee;Wee, Ji-Hyang;Yun, Yeo Sang;Kim, Ye Ri;Park, Yong Jin;Jung, Kyoung Ok;Sung, Hea Mi;Lee, Hyung Gun
Journal of the Korean Society of Food Science and Nutrition
/
v.45
no.1
/
pp.1-11
/
2016
This study was conducted to investigate effect of the acetylcholinesterase inhibitor activity, the protective effect of the extract on SH-SY5Y cell death by $H_2O_2$, the memory improvement from scopolamine-induced rat. Moreover, the antioxidant activity of isorhamnetin from the dropwort (Oenanthe javanica) was investigated. Acetylcholinesterase inhibitor activity was highest (28.59%) in Hwasun O. javanica extract (H-OJE). H-OJE and Naju O. javanica extract (N-OJE) were not significantly different. SH-SY5Y cell death deceased to 37.23% and 36.68% for H-OJE and N-OJE, respectively, following treatment with the extracts. O. javanica extracts showed a protective effect against $H_2O_2$-induced neurotoxicity. Treatment with O. javanica extracts slightly improved scopolamine-induced (1 mg/kg, i.p.) memory impairment in rats. H-OJE contained the highest total phenolic and flavonoid contents of 117 mg/g and 30 mg gallic acid equivalents/g, respectively, and had a DPPH radical scavenging activity ($SC_{50}$) of $113.8{\mu}g/mL$ and ABTS radical scavenging activity of $48.2{\mu}g/mL$, which was higher than the other extracts. The thiobarbituric acid reactive substances value was highest (50.2%) in H-OJE. Antioxidant activity differed significantly among dropwort extracts. Isorhamnetin was known as one of the flavonoid and for having neuroprotective effect. So we analyzed acid-hydrolyzed O. javanica extract HPLC. The results were that peak at 14 min and spectrum of the extracts was consistent with standard solution. The results of LC/MS/MS analysis were that the extract and standard solution were confirmed total ion chromatogram at identical time, precursor ion was 317 $[M-H]^+$ m/z, product ion was 302 $[M-H]^+$ m/z. Overall, the results showed that the dropwort extract led to memory improvement and had antioxidant activity. Based on these finding, further research to investigate the production of ethanol extract of dropwort as a processed food is warranted.
Jung, Tae-Dong;Shin, Gi-Hae;Kim, Jae-Min;Oh, Ji-Won;Choi, Sun-Il;Lee, Jin-Ha;Cho, Myoung-Lae;Lee, Sang Jong;Heo, In Young;Park, Seon Ju;Kim, Sung-Up;Jung, Chan-Sik;Lee, Ok-Hwan
Journal of the Korean Society of Food Science and Nutrition
/
v.45
no.1
/
pp.143-148
/
2016
This study investigated the lignan content, total phenol content, and antioxidant activities [2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and oxygen radical absorbance capacity (ORAC)] of fermented sesame by cultivars. The results showed that the lignan contents of fermented and non-fermented sesame ranged from 2.35~6.58 mg/g and 2.17 to 6.58 mg/g, respectively. The highest total phenol contents of fermented and non-fermented sesame were 51.90 mg gallic acid equivalent (GAE)/g and 25.94 mg GAE/g, respectively. DPPH radical scavenging and ORAC value ranged from 37.95 to 82.57% and from 172.34 to $1,067.80{\mu}M$ TE/g in non-fermented sesame and fermented sesame, respectively. Fermented sesame had higher lignan content, total phenol content and antioxidant activities. than those of non-fermented sesame. Fermented sesame subjected to bioconversion showed increased lignan content and high antioxidant activity.
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