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Kim, Wooki,Kim, Sang-Youn,Kim, Dae-Ok,Kim, Byung-Yong,Baik, Moo-Yeol Elsevier 2018 Food chemistry Vol.240 No.-
<P><B>Abstract</B></P> <P>Puffing of coffee beans, which induces heat- and pressure-derived physicochemical changes, was applied as an alternative to roasting. Roasted or puffed coffee beans with equivalent lightness values were compared. The moisture content was higher while the crude fat and protein compositions were lower in puffed beans than in roasted beans. The pH was lower and the acid content was higher in puffed beans than in roasted beans. The roasted beans exhibited greater specific volumes, while the puffed beans displayed greater extraction yields. The trigonelline and total phenolic contents were greater in puffed beans than in roasted beans resulting in an enhanced antioxidant capacity. Sensory evaluation of roasted and puffed coffee bean brews revealed that puffing did not affect the flavor or overall acceptance. The current study provides evidence that puffing is an alternative to roasting coffee beans with various benefits.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Puffing is a novel alternative of roasting in coffee processing. </LI> <LI> Puffing increased extraction yield and antioxidant capacity compared to roasting. </LI> <LI> Puffing did not increase specific volume but increased extraction yield. </LI> <LI> Chlorogenic acid and trigonelline contents significantly reduced with roasting. </LI> </UL> </P>
Aronia melanocarpa reduced adiposity via enhanced lipolysis in high-fat diet-induced obese mice
Kim, Hyun Kyung,Jung, Jiyeon,Kang, Eun Young,Gang, Gyoungok,Kim, Wooki,Go, Gwang-woong Korean Society of Food Science and Technology 2020 한국식품과학회지 Vol.52 No.3
Obesity is a critical health issue in Korea, where half of all adults are overweight and a third obese. Aronia melanocarpa -rich in flavonoids and phenolics- with antioxidant and anti-inflammatory activities, could have anti-obesity activity and reduce body fat mass by upregulating lipolysis and β-oxidation in obese mice. Male C57BL/6J mice (n=12) were assigned into four groups: normal chow (18% kcal from fat); high-fat diet control (HFD, 45% kcal from fat); HFD+A. melanocarpa (200 mg/kg diet); HFD+Xenical (500 mg/kg diet, positive control). Antioxidant capacity of A. melanocarpa was established in vitro and in vivo. Weight loss was induced as decreased adiposity and lowered respiratory quotient at rest suggested oxidation of stored fat. Adiposity reduction, accompanied with elevated fat utilization, was owing to enhanced activity of hormone-sensitive lipase. Thus, A. melanocarpa lowered adiposity by enhancing lipolysis and utilization of fatty acids in visceral fat.
Kim, Wooki,Barhoumi, Rola,McMurray, David N,Chapkin, Robert S Cambridge University Press 2014 The British journal of nutrition Vol.111 No.2
<P>We have demonstrated previously that n-3 PUFA endogenously produced by fat-1 transgenic mice regulate CD4+ T-cell function by affecting the formation of lipid rafts, liquid-ordered mesodomains in the plasma membrane. In the present study, we tested the effects of dietary sources of n-3 PUFA, i.e. fish oil (FO) or purified DHA, when compared with an n-6 PUFA-enriched maize oil control diet in DO11.10 T-cell receptor transgenic mice. Dietary n-3 PUFA were enriched in CD4+ T-cells, resulting in the increase of the n-3:n-6 ratio. Following antigen-specific CD4+ T-cell activation by B-lymphoma cells pulsed with the ovalbumin 323-339 peptide, the formation of liquid-ordered mesodomains at the immunological synapse relative to the whole CD4+ T-cell, as assessed by Laurdan labelling, was increased (P<?005) in the FO-fed group. The FO diet also suppressed (P<?005) the co-localisation of PKCθ with ganglioside GM1 (monosialotetrahexosylganglioside), a marker for lipid rafts, which is consistent with previous observations. In contrast, the DHA diet down-regulated (P<?005) PKCθ signalling by moderately affecting the membrane liquid order at the immunological synapse, suggesting the potential contribution of the other major n-3 PUFA components of FO, including EPA.</P>
Kim, Bomi,Lee, Jong Hun,Seo, Myung-Ji,Eom, Seok Hyun,Kim, Wooki Korean Society of Food Science and Technology 2016 Food Science and Biotechnology Vol.25 No.5
Plant-extracted flavonoid glycosides have been reported to be bioactive compounds with pleiotropic functions, including antioxidant, anti-inflammatory, and anti-cancer effects. This study investigated the anti-inflammatory role of linarin (acacetin-7-rutinoside, which is found in Chrysanthemum indicum (Gam-Guk) and Dendranthema zawadskii (Gu-Jul-Cho)), on lipopolysaccharide-stimulated RAW264.7 macrophages. Linarin treatments exhibited no cytotoxicity up to a concentration of $30{\mu}M$, as assessed by MTT assay. The production of nitric oxide, an inflammatory mediator, was decreased by addition of linarin. The secretion of pro-inflammatory cytokines, interleukin-$1{\beta}$ and interleukin-6, was significantly decreased in a dose-dependent manner. Linarin also decreased the phagocytic ability of macrophages following co-culture with fluorescent beads. In addition, expression levels of antigen-presenting surface markers, MHC II and CD80, were suppressed by linarin. Taken together, these results indicate that the flavonoid glycoside linarin has an anti-inflammatory effect, in part through the suppression of phagocytosis, cytokine production, and antigen presentation in macrophages.