35 Result(s)
within
Young-Ho Kim
Chemistry
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Article
In Vitro Investigation of Acetylcholinesterase Inhibitors Isolated from the Fruit of Stauntonia hexaphylla
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Article
Open AccessQuality control and evaluation of Inonotus obliquus using HPLC method with novel marker compounds
Current quality control of Inonotus obliquus requires chromogen complex content limit of 10% in accordance with the State Pharmacopoeia of the Union of Soviet Socialist Republics. However, this causes ambiguous r...
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Article
Open AccessDiscrimination and quality evaluation of fifteen components in Stauntonia hexaphylla leaves from different harvest time by HPLC–PDA–ESI–MS/MS and ELSD coupled with multivariate statistical analysis and anti-inflammatory activity evaluation
The leaves of Stauntonia hexaphylla (SHL) are a very popular herbal medicine in Korea because it can be used to treat rheumatic osteoporosis and other diseases. However, owing to the inconsistency in harvesting t...
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Article
Open AccessLow-density lipoprotein-antioxidant flavonoids and a phenolic ester from Plectranthus hadiensis var. tomentosus
To investigate the effects of extraction solvents and drying methods on Plectranthus hadiensis var. tomentosus quality, eight compounds were isolated and the content of active compounds with their antioxidant act...
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Article
Ginsenosides from Korean red ginseng modulate T cell function via the regulation of NF-AT-mediated IL-2 production
Korean red ginseng is a traditional health food frequently used to prevent or treat various diseases worldwide. In this study, we evaluated the immunomodulatory activities of eleven compounds (1–11) isolated from...
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Article
Open AccessDirect isolation and characterization of circulating exosomes from biological samples using magnetic nanowires
Tumor-derived exosomes are gaining attention as important factors that facilitate communication between neighboring cells and manipulate cellular processes associated with cancer development or progression. Th...
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Article
Anti-allergic effects of Rosae multiflorae fructus via inhibition of T cell proliferation and the mast cell function
Anti-allergic effects of the hot water extract of Rosae multiflorae fructus (Rosae extract), which has long been used in oriental medicine for treatment of various diseases, were explored with a chicken ovalbumin...
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Article
Chemical Constituents of the Aerial Parts of Artemisia iwayomogi
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Article
Enhancement of electrical conductivity of carbon nanotube fibers by copper sulfide plating
The present study aimed to enhance the electrical conductivity of carbon nanotube (CNT) fibers by introducing copper sulfide (CuS) into them. CuS forms a very stable compound with an electrical conductivity as...
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Article
Evaluation of the anti-osteoporosis and antioxidant activities of phenolic compounds from Euphorbia maculata
Antioxidant and anti-osteoporosis activities of extracts and chemical constituents from the whole plant of Euphorbia maculata were investigated. The MeOH extract, as well as EtOAc and H2O fractions (10.0 μg/mL), ...
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Article
Artocarpus nigrifolius: Cytotoxic and antibacterial constituents
Six known compounds including α-amyrin 3-acetate (1), β-sitosterol (2), betulinic acid (3), friedelan-3-one (4), artochamin B (5), and 2-C-methyl-d-erythritol 4-O-α-d-glucopyranoside (6) were isolated from the st...
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Article
Isolation of xanthones from adventitious roots of St. John’s Wort (Hypericum perforatum L.) and their antioxidant and cytotoxic activities
In this phytochemical study, 5 xanthones, 1,3,5,6-tetrahydroxyxanthone [1], 1,5,6-trihydroxy-3-methoxyxanthone [2], ferrxanthone [3], brasilixanthone B [4], and neolancerin [5] were isolated from adventitious roo...
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Article
Influence of extrusion condition and hemp addition on wheat dough and bread properties
This study was to evaluate the influence of hemp addition and extrusion conditions on properties of dough and bread. The extruded and non-extruded hemp/ rice flours with different hemp/rice ratio were mixed wi...
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Article
Enzymeless determination of total sugar by luminol–tetrachloroaurate chemiluminescence on chip to analyze food samples
Chemiluminescence (CL) emission from luminol–tetrachloroaurate ([AuCl4]−) system studied in presence of monosaccharide sugars such as glucose and fructose was investigated on a microfluidic chip fabricated by the...
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Article
Antioxidative and anti-inflammatory effect of quercetin and its glycosides isolated from mampat (Cratoxylum formosum)
In this study, quercetin, quercetin-3-O-β-d-glucopyranoside (isoquercitrin), quercetin-3-O-β-d-galactopyranoside (hyperin), and quercertin-3-O-α-l-rhamnoside (quercitrin) from mampat (Cratoxylum formosum) were is...
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Article
Determination of catecholamines based on the measurement of the metal nanoparticle-enhanced fluorescence of their terbium complexes
We have developed a method for the determination of the three catecholamines (CAs) epinephrine (EP), norepinephrine (NE), and dopamine (DA) at sub-nanomolar levels. It is found that the luminescence of the com...
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Article
Size-controlled nanoparticles of poly(acrylonitrile-co-methyl methacrylate) for moisture-absorbing heat release applications
Hydrophilic and water-insoluble poly(acrylonitrile-co-methyl methacrylate) [P(AN-co-MMA)] nanoparticles were prepared to investigate their moisture-absorbing heat release effect. The nanoparticle size was control...
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Article
Method for determination of fluoroquinolones based on the plasmonic interaction between their fluorescent terbium complexes and silver nanoparticles
We report on a fluorometric method for the determination of the fluoroquinolones levofloxacin (LEV) and moxifloxacin (MOXI). It is based on the Tb(III)-sensitized luminescence that is plasmonically enhanced by...
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Article
Buddlejasaponins from the flowers of Buddleja officinalis
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Article
Synthesis of ArF photoresist polymer composed of three methacrylate monomers via reversible addition-fragmentation chain transfer (RAFT) polymerization
ArF photoresist polymers were prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization and free radical polymerization (FRP). Three methacrylates with lithographic functionalities inclu...
