Phenolic and phenylethanoidal glycosides from branch of Fraxinus sieboldiana
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To investigate chemical constituents from an ethanolic extract of the branch of Fraxinus sieboldiana (Oleaceaue)The constituents were isolated and purified by a combination of various chromatographic techniques including silica gel, macroporous adsorbent resin, Sephadex LH-20, and preparative HPLC. Structures of the isolates were elucidated by spectroscopic methods including 1D and 2D NMR and MS techniques.Four phenolic and twelve phenylethanoidal glycosides were obtained and their structures were identified as 2,6-dimethoxy-p-hydroquinone-4-O-beta-D-glucopyranoside (1), 2,6-dimethoxy-p-hydroquinone-1-O-beta-D-glucopyranoside (2), 4-hydroxy-3-methoxyphenyl beta-D-glucopyranoside (3), 4-hydroxy-3-methoxyphenyl beta-D-xylopyranosyl (1-->6)-O-beta-D-glucopyranoside (4), osmanthuside H (5), 2-(4-hydroxyphenyl) ethyl beta-D-glucopyranoside (6), 2-(3, 4-dihydroxyphenyl) ethyl beta-D-glucopyranoside (7), 2-hydroxy-4-(2-hydroxyethyl)-phenyl beta-D-glucopyranoside (8), 4-(2-hydroxyethyl)-2-methoxyphenyl beta-D-glucopyranoside (9), calceolarioside B (10), calceolarioside A (11), ferruginoside A (12), isolugrandoside (13), acteoside (14), chiritotoside C (15), and plantasisoside (16).Compounds 1-4,9,12, 13 and 16 were obtained from the genus Fraxinus for the first time.Keywords:
Hydroquinone
Sephadex
OBJECTIVE To study the chemical constituents of the stems and branches of Ancistrocladus tectorius.METHODS The constituents were isolated and purified by chromatography on aluminium oxide,silica gel and Sephadex LH-20 column.Their structures were identified by physicochemical properties and spectral analysis.RESULTS Seven alkaloids compounds were isolated and identified as ancistrobertsonine B(1),ancistrotectorine(2),(1S,3S)-5-(4,5-dimethoxy-2-methyl-naphthalen-1-yl)-6,8- dimethoxy-1,3-dimethyl-1,2,3,4-tetrahydruisoquinoline(3),(1S,3R)-5-(4,5-dimethoxy-2-methylnaphthalen-1-yl)-6,8- dimethoxy-1,3-dimethyl-1,2,3,4-tetrahydroisoquinoline(4),ancistrocline(5),ancistrocladinine(6),hamatinine(7). CONCLUSION Compounds 1,3,4,6 and 7 were isolated from this plant for the first time.
Sephadex
Tetrahydroisoquinoline
Spectral Analysis
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OBJECTIVE: To study the chemical constituents of Lysidice brevicalyx. METHOD: Various chromatographic techniques were used to isolate and purify the constituents such as column chromatography on silica gel, Rp-silica gel, Sephadex LH-20 and HPLC. The structures were elucidated by chemical evidence and spectroscopic methods. RESULT: Seven compounds were isolated from the 95% ethanol extract of the leaves of L. brevicalyx and these compounds were elucidated as 2-0-[1-(3-methylbutyryl)phloroglucin-ol]-beta-D-glucopynanoside (1), 3-beta-D-glucopyranosyloxy-4, 5-dimethoxy-benzoic acid (2), benzyl alcohol O-beta-D-glucopyra noside (3), polydatin (4), quercetin-3-alpha-L-rhamnopyranoside (5), ethyl gallate (6), benzyl 6-O-alpha-L-arabinofurano syl-beta-D-glucopynanoside (7). CONCLUSION: All Compounds were isolated from this plant for the first time. Compounds 2, 3, 5-7 were obtained from this genus for the first time.
Sephadex
Benzyl alcohol
Benzoic acid
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Objective: To investigate the chemical constituents of the sponge Plakortis simplex from the south China sea. Method: Column chromatography on silica gel,reversed-phase silica gel( ODS),Sephadex LH-20 and high performance liquid chromatography( HPLC) was used to study the chemical constituents of the sponge P. simplex collected from the south China sea. The structures of these compounds were elucidated on the basis of physicochemical and spectral analysis. Result: Seven compounds were isolated from the methanol extract of P. simplex,and their structures were identified as( 22E)-5α,8α-epidioxyergosta-6,22-dien-3β-ol( 1),indole-3-carboxylic acid( 2),indole-3-carboxaldehyde( 3),monotriaj-aponide A( 4),methyl( 2Z,6R,8R,9E)-3, 6-epoxy-4,6, 8-triethyl-2, 4, 9-dodec-atrienoate( 5), methyl( 2Z, 6R, 8S)-3, 6-epoxy-4, 6, 8-triethyldodeca-2, 4-dienoate( 6), methyl( 2Z, 6R, 8S)-4, 6-diethyl-3, 6-epoxy-8-methye( 7). Conclusion: 7 compounds were isolated from P. simplex for the first time.
Sephadex
Sponge
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To study the chemical constituents of Macrothelypteris viridifrons and their anti-proliferative effects on tumor cell.The compounds were isolated by column chromatography with silica gel, C18 reverse-phase silica gel, sephadex LH-20, and their structures were elucidated on the basis of physiochemical propertities and spectral analysis. The antitumor activities of all compounds were tested with MOLT4, Hep G2, A-549, MCF-7, HT-29, PC-3 tumor cell lines.Five compounds were isolated and identified as protoapigenone (1), protoapigenin (2), protoapigenin-4'-O-beta-D-glucopyanoside (3), 5,7-dihydroxy-2-(1,2-isopropyldioxy-4-oxo-cyclohex-5-enyl) -chromen-4-one (4), 5,7-dihydroxy-2-(1-hydroxy-2,6-dimethoxy-cyclohex-4-oxo) -chromen-4-one (5), respectively.All compounds were obtained from this plant for the first time. Compounds 1, 4 and 5 showed strong anti-proliferative effects on six tumor cells, which were in concentration-dependent manner.
Sephadex
Hep G2
Spectral Analysis
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Abstract A stable poly(crystal-violet) (PCV) electroactive film was electrodeposited on a glassy carbon electrode (GCE). The redoxation of hydroquinone showed a pair of well-defined peaks on a PCV electrode with a potential difference of 30 mV, which is 120 mV less than that obtained on the GCE. At optimal conditions, the PCV electrode linearly responded to the hydroquinone in the range of 4 × 10−6 mol · L−1 to 3.2 × 10−3 mol · L−1 and a detection limit of 8 × 10−8 mol · L−1 was obtained. The separations of the oxidation peak potentials between hydroquinone and the coexisting o-hydroquinone and m-hydroquinonewere 100 mV and 430 mV, respectively, which allows their simultaneous determination. The detection of hydroquinone in artificial sewage water was demonstrated with satisfactory results.
Hydroquinone
Crystal (programming language)
Crystal violet
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Hydroquinone
Degradation
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Elon and hydroquinone developers have been studied under conditions of varying concentration and pH. It was found that the rate of development by both agents varies as the first, or less, power of the concentration, thus indicating that the super-additivity of the Elon-hydroquinone developer is not a function of increasing developing agent concentration. The combined data for changing concentration and pH indicate that both the single and double charged hydroquinone ions are active.
Hydroquinone
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The chemical constituents of Vernonia spirei Gandog were studied.The constituents were separated and purified from MeOH extract of the whole plant with column chromatographic methods through silica gel,RP-18 silica gel,Sephadex LH-20,HPLC,and preparative TLC.Their chemical structures were characterized by spectroscopic methods including NMR and EIMS.The result showed that Vernonia spirei Gandog contained two components including 5,7,4'-trihydroxy-6,3'-dimethoxyflavone(Ⅰ),5,3'-dihydroxy-6,7,4'-trimethoxyflavone(Ⅱ).These compounds were obtained from this genus for the first time.
Sephadex
Flavones
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Hydroquinone monopropionate was synthesized by partially alcoholysized and deacylated of hydroquinone bipropionate in methanol-water solution and alkaline condition with appropriate antioxidant. The synthesis was in mild condition ,short reaction time, lower cost and the product was separated easily. The yield of hydroquinone monopropionate was up to 78. 5%and the purity was 99. 49%.
Hydroquinone
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