• Journal of Applied Biological Chemistry
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• v.55 no.3
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• pp.195-198
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• 2012

Four chromone derivatives (1-4) were isolated from the clove buds (Syzygium aromaticum). Of these, two chromone C-glucosides (1 and 2) showed significant PEP inhibition with $IC_{50}$ values of $1.48{\pm}0.02$ and $1.74{\pm}0.03{\mu}M$ and $K_i$ values of $0.27{\pm}0.02$ and $0.50{\pm}0.05{\mu}M$, respectively. They also exhibited strong antioxidant capacities against the 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid diammonium salt radical system with $EC_{50}$ values of $4.13{\pm}0.04$ and $4.79{\pm}0.03{\mu}M$, respectively.

• YAKHAK HOEJI
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• v.44 no.2
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• pp.107-114
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• 2000

We have synthesized 4-isonitroso-4H-1-benzopyran and 4-amino-2,3-dihydro -4H-1-benzopyran of chromone derivatives by using condensation method. Physico-chemical properties of these compounds were measured and analyzed by UV and HPLC method. The correlation coefficient of their methanol solutions by UV were 0.9992 and 0.9994, respectively. And oxime compound was resolved within 4 min and had a detection limit of 3 ng at S/N=3 by HPLC using a reversed phase column with three solvents(MeOH, $H_2O$, HAc). The amino compound was resolved within 4.5 min and had a detection limit of 10 ng at S/N=3 by HPLC under the same conditions. Anti-diabetic effect of chromone derivatives were investigated in the streptozotocin (STZ)-induced diabetic rats. Diabetes was induced in male Sprague-Dawley rats by injections of STZ (45 mg/kg, i.v). The investigation of the hair growth effect of isonitrosobenzopyran and 4-aminobenzopyran on the hair of black mouse (C57BL/6) was also carried out. The administraion of their ethanol solution to the black mouse (C57BU/6) through skin them promoted the growth of hair.

• Natural Product Sciences
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• v.26 no.4
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• pp.340-344
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• 2020

A new chromone analogue (1) was isolated from an EtOAc-extract of Pleosporales sp. culture medium, together with five known chromones (2 - 6). The isolation workflow was guided by a Molecular Networking-based dereplication strategy. The chemical structure of the new compound was elucidated using NMR and MS spectroscopy, and the absolute configuration was established by the Mosher's method. All isolated compounds were evaluated for their inhibitory effects on lipopolysaccharide-induced nitirc oxide production in RAW 264.7 macrophages. Compound 1 showed marginal inhibitory activity with an IC50 value of 118.7 μM.

• Natural Product Sciences
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• v.27 no.4
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• pp.228-233
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• 2021

Bioactivity-guided fractionation by preliminary screening using interleukin-1β production in lipopolysaccharides (LPS)-induced J774A.1 cell line led to the isolation of fourteen structures including chromone, isocoumarins, flavanoids, and triterpenes from the aerial part of Agrimonia pilosa Ledeb. All structures were determined by measuring their spectroscopic data and comparing their spectroscopic data with the literatures. All the isolates were tested for their inhibitory activities against interleukin-1β production in LPS-induced J774A.1 cell. Of the tested compounds, (S)-(+)-5,7-dihydroxy-2-(1-methylpropyl)chromone (1), agrimonolide-6-O-β-D-glucopyranoside (5), agrimonolide-6-O-α-L-arabinofuranosyl-(1→6)-β-D-glucopyranoside (6), and catechin (10) were found to be active. Furthermore, compound 1 suppressed the protein expressions of NLRP3 and NLRC4 in murine macrophage.

• Natural Product Sciences
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• v.10 no.4
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• pp.173-176
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• 2004

Six compounds were isolated from the BuOH soluble fraction of the leaves of Staphylea bumalda. On the basis of spectral data, they were identified as atragalin (1), $2-methyl-5,\;7-dihydroxy-chromone-7-O-{\beta}-D-glucopyranoside$ (2), isoquercitrin (3), nicotiflorin (4), kaempferol 3-neohesperidoside (5), kaempferol $3-O-[{\alpha}-rhamno-pyranosyl-(1\;{\to}\;4)-rhamnopyranosyl-(1\;{\to}\;6)-{\beta}-D-glucopyranoside]$ (6), respectively.

• Archives of Pharmacal Research
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• v.10 no.2
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• pp.142-147
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• 1987

Fourteen kinds of medicinal plants were screened for determining inhibitory activities on monoamine oxidase B. The extracts of Artemisia Messer-Schmidtiana (herba), Chrysanthemum indicum(flos), Ericibe obtusifolia (radix et rhizoma) and Sophora japonica (flos) strongly inhibited the enzyme. Among them, Chrysanthemi flos was chosen for elucidating its active principles, and some flavonoids were isolated and identified as acasetin (I), 5, 7-dihydroxy chromone (II), diosmetin (III), apigenin (IV), eriodictyol (V) and luteolin (VI).$IC_{50} were determined as following: 1, 2.46;II, 0.19; III, 2. 11mM, and the others showed weak inhibition.

• Archives of Pharmacal Research
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• v.12 no.1
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• pp.12-16
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• 1989

6-Formyl-5-methoxy-2-methyl chromone derivatives condensed with 2-thiox-4-imidazolinone derivatives to form the corresponding '10-methoxy-7-methyl-3-thioxo-chromone[6,7-b]pyrrolo[1,2-a-]-imidazolin-1-one derivatives (IIIa-f) or the 5-arvlidene-2-thioxo-4-imidazolinone derivatives(IVa-f). The activity of the NH in the imidazol moiety of (IIIa) was confirmed by formation of the Mannich bases (Va, b). Moreover, alkylation of (IIIa) was undertaken to give the alkylmercapto derivatives (VIa, b). The antimicrobial activities of compounds IIIb-e, IVa, IVe were studied.

• Molecules and Cells
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• v.26 no.2
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• pp.171-174
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• 2008

Flavone (2-phenyl chromone) is a well-known plant flavonoid, but its bioactivity has been little explored. Treatment of Caenorhabditis elegans or C. brissage with flavones induced embryonic and larval lethality that was pronounced in early larval stages. This anti-nematodal effect was also observed in the pinewood nematode, B. xylophilus. $LD_{50}$ values were approximately $100{\mu}M$ for both B. xylophilus and C. elegans. Our results indicate that flavone is an active nematicidal compound that should be further investigated with the aim of developing a potent drug against B. xylophilus.

• Bulletin of the Korean Chemical Society
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• v.32 no.6
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• pp.2132-2134
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• 2011

• Journal of the Korean Chemical Society
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• v.49 no.4
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• pp.377-380
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• 2005