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Kwon, Dodan,Kim, Gyoung Deuck,Kang, Wonseok,Park, Jeong-Eun,Kim, Song Hee,Choe, Eunok,Kim, Jung-In,Auh, Joong-Hyuck The Korean Society for Applied Biological Chemistr 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.4
Actinidia arguta leaves are consumed as a popular food material in Korea and have been reported to exert beneficial effects on humans due to its constituent polyphenolic compounds. In this study, the ${\alpha}$-glucosidase inhibitory compounds in A. arguta were screened and identified through ${\alpha}$-glucosidase-guided fractionation and metabolomic analysis. The 50% ethanol extracts of A. arguta showed strong inhibitory effect (32.6%), which was comparable to acarbose as a positive control (30.0%). Through multiple steps of fractionation, pinoresinol diglucoside and fertaric acid were identified as the major potent compounds in A. arguta inhibiting ${\alpha}$-glucosidase activity by liquid chromatography mass spectrometry analysis and metabolomic comparison. Particularly, because pinoresinol and its glycosides have been demonstrated as ${\alpha}$-glucosidase inhibitory agents, pinoresinol diglucoside was proposed to be a putative key compound for ${\alpha}$-glucosidase inhibition in A. arguta. This is the first study demonstrating the anti-diabetic effect of a pinoresinol-containing fraction of A. arguta and would be useful for its application as a natural ${\alpha}$-glucosidase inhibitor.
Optimizing Carnosine Containing Extract Preparation from Chicken Breast for Anti-glycating agents
Kim, Seung-Ki,Kwon, Dodan,Kwon, Da-Ae,Paik, In Kee,Auh, Joong-Hyuck Korean Society for Food Science of Animal Resource 2014 한국축산식품학회지 Vol.34 No.1
Optimization of carnosine and anserine extraction from chicken breast was performed using response surface methodology (RSM) to obtain the maximized physiological activities for anti-glycation and anti-oxidation. The optimum extraction conditions were water extraction for 1.6 h in the case of the 20-wk laying hen muscle and water extraction for 2.12 h in the case of 90-wk laying hen muscle. Higher carnosine and anserine contents were measured in the 20-wk laying hen muscle, along with higher physiological activities, which increased in direct proportion with the dipeptide contents. The extracts prepared from the 20-wk laying hen under optimum conditions showed 57% inhibition of advanced glycated end-product formation, 64% inhibition of lipid peroxidation, and 61% of DPPH radical scavenging effects. On the other hand, 52% inhibition of AGE formation, 62% inhibition of lipid peroxidation, and 53% of DPPH radical scavenging effect were demonstrated within the 90-wk laying hen. In addition, the ratio of carnosine was a key indicator for the physiological activities of the extracts.
Optimizing Carnosine Containing Extract Preparation from Chicken Breast for Anti-glycating agents
Seung-Ki Kim,Dodan Kwon,Da-Ae Kwon,In Kee Paik,어중혁 한국축산식품학회 2014 한국축산식품학회지 Vol.34 No.1
Optimization of carnosine and anserine extraction from chicken breast was performed using response surface methodol-ogy (RSM) to obtain the maximized physiological activities for anti-glycation and anti-oxidation. The optimum extractionconditions were water extraction for 1.6 h in the case of the 20-wk laying hen muscle and water extraction for 2.12 h in thecase of 90-wk laying hen muscle. Higher carnosine and anserine contents were measured in the 20-wk laying hen muscle,along with higher physiological activities, which increased in direct proportion with the dipeptide contents. The extracts pre-pared from the 20-wk laying hen under optimum conditions showed 57% inhibition of advanced glycated end-product for-mation, 64% inhibition of lipid peroxidation, and 61% of DPPH radical scavenging effects. On the other hand, 52% inhibitionof AGE formation, 62% inhibition of lipid peroxidation, and 53% of DPPH radical scavenging effect were demonstratedwithin the 90-wk laying hen. In addition, the ratio of carnosine was a key indicator for the physiological activities of the ex-tracts.
Anti-inflammatory effects of Nelumbo leaf extracts and identification of their metabolites
Eunkyo Park,Gyoung Deuck Kim,Min-Sun Go,Dodan Kwon,In-Kyung Jung,Joong Hyuck Auh,Jung-Hyun Kim 대한지역사회영양학회 2017 Nutrition Research and Practice Vol.11 No.4
BACKGROUND/OBJECTIVES: Nelumbo leaves have been used in traditional medicine to treat bleeding, gastritis, hemorrhoids, and halitosis. However, their mechanisms have not been elucidated. MATERIALS/METHODS: The present study prepared two Nelumbo leaf extracts (NLEs) using water or 50% ethanol. Inflammatory response was induced with LPS treatment, and expression of pro-inflammatory mediators (inducible nitric oxide synthase, cyclooxygenase-2, tumor necrosis factor-α (TNF-α), interleukin (IL)-1β, and IL-6 and nitric oxide (NO) and prostaglandin E₂ (PGE₂) productions were assessed. To determine the anti-inflammatory mechanism of NLEs, we measured nuclear factor-κB (NF-κB) activity. Major metabolites of NLEs were also analyzed and quantified. RESULTS: NLEs effectively reduced the expression and productions of pro-inflammatory mediators such as IL-1β, IL-6, TNF-α, PGE₂ and NO. NLEs also reduced NF-κB activity by inhibiting inhibitor of NF-κB phosphorylation. Both extracts contained catechin and quercetin, bioactive compounds of NLEs. CONCLUSIONS: In this study, we showed that NLEs could be used to inhibit NF-κB-mediated inflammatory responses. In addition, our data support the idea that NLEs can ameliorate disease conditions involving chronic inflammation.