Seasonal variations of iminosugars in mulberry leaves detected by hydrophilic interaction chromatography coupled with tandem mass spectrometry.[Pubmed: 29426416]

A rapid, sensitive, and validated method was developed for the simultaneous determination of four iminosugars, 1-deoxynojirimycin (DNJ), d-fagomine (FAG), 2-O-a-d-galactopyranosyl-DNJ (Gal-DNJ), and 4-O-β-d-glucopyranosyl-fagomine (Glu-FAG), in mulberry leaves. The method used hydrophilic interaction chromatography coupled with tandem mass spectrometry. Based on this method, the seasonal variations of iminosugars in the leaves of different mulberry species (Morus alba, Morus multicaulis Perr, Morus atropurpurea Roxb. and Morus wittiorum Hand-Mazz.) collected in Guangzhou, China, during 10 consecutive months in 2013 were investigated. The results indicated that the maximum content of DNJ in the leaves of all four species occurred in summer (June or July). The highest FAG level was found in spring (April or May). The highest levels of Gal-DNJ and Glu-FAG were recorded in autumn (September or October).

Anti-inflammatory and cytotoxic 2-arylbenzofurans from Morus wittiorum.[Pubmed: 22433397]

Three new 2-arylbenzofurans named wittifuran H, wittifuran I and wittifuran U (1-3) were obtained during our ongoing investigation of an ethanol extract from the stem bark of Morus wittiorum. Their structures were elucidated on the basis of spectroscopic data. Compound 2 displayed potent anti-inflammatory activity and selective cytotoxicity against human gastric cancer cell line BGC-823 with an IC(50) value of 1.45μM.

[Phenolic constituents from stem bark of Morus wittiorum and their anti-inflammation and cytotoxicity].[Pubmed: 21246822]

To search for the chemical constituents possessing anti-inflammatory or cytotoxic activities from plants, Morus wittiorum was investigated for the first time. The stem bark of M. wittiorum was extracted with 95% EtOH. The EtOH extract was fractionationed on silica gel by eluting with petroleum ehter, CHCl3 and EtOAc successively. The further isolation and purification of the EtOAc fraction of 95% EtOH extract was performed by various column chromatography such as silica gel, Sephadex LH-20, RP-C18 column chromatography and so on. The structures of compounds were determined on the basis of spectral analysis such as NMR, MS etc. As a result, nine compounds were isolated including six flavonoids and three stilbenoids and elucidated as quercetin (1), 5, 7, 3', 4'-tetrahydroxy-3-methoxyflavone (2), norartocarpanone (3), dihydrokaempferol (4), euchrenone a7 (5), morachalcone A (6), resveratrol (7), oxyresveratrol (8), 4'-prenyloxyresveratrol (9). Compounds 1-9 were isolated from this plant for the first time, among which compounds 1-8 were evaluated for their anti-inflammatory and cytotoxic activities, respectively. Wherein compounds 6 and 8 showed inhibition to the release of beta-glucuronidase from rat polymorphonuclear leukocyte (PMNs) induced by platelet activating factor (PAF) at a concentration of 10(-5) mol x L(-1). The inhibitory ratios were 76.8%, 94.2% individually. Compounds 2 and 8 exhibited selective cytotoxicity agaist human ovarian cancer (A2780) and human gastric cancer (BGC-823) with IC50 values as 0.66, 1.31 micromol x L(-1) individually.

Three new flavane glucosides from the leaves of Morus wittiorum.[Pubmed: 20706904]

Three new flavane glucosides (1-3) were isolated from the leaves of Morus wittiorum. The structures with absolute configuration were determined on the basis of hydrolysis and spectroscopic methods including UV, IR, HR-ESI-MS, 1D, and 2D NMR.

Five new 2-arylbenzofuran derivatives from Morus wittiorum.[Pubmed: 20410648]

Five new 2-arylbenzofuran derivatives wittifurans A-C, F and G (1-5) have been isolated from the stem bark of Morus wittiorum. Their structures were determined on the basis of spectroscopic analysis. Compounds 1, 3-5 were evaluated for their antioxidant and anti-inflammatory activities respectively.

Bioactive 2-arylbenzofuran derivatives from Morus wittiorum.[Pubmed: 20362036]

Investigation of an ethanol extract from the stem bark of Morus wittiorum led to the isolation of five new 2-arylbenzofuran derivatives that were named wittifuran S, wittifuran T, wittifuran V, wittifuran W and wittifuran X (1-5). Structures were determined on the basis of spectroscopic analysis. Two new wittifurans and five previously isolated compounds were assayed for antioxidant and anti-inflammatory activity.

[2-Arylbenzofuran derivatives from Morus wittiorum].[Pubmed: 19239031]

The investigation on the stem bark of Morus wittiorum was carried out to find its chemical constituents possessing anti-oxidative activity. The isolation and purification were performed by various chromatographies such as silica gel, Sephadex LH-20, RP-C18 column chromatography and so on. Based on the spectral analysis such as NMR, MS, etc., seven 2-arylbenzofuran derivatives were identified as wittifuran D (1), wittifuran E (2), moracin C (3), moracin M (4), moracin P (5), 2-(3,5-dihydroxyphenyl)-5,6-dihydroxybenzofuran (6) and mulberroside C (7). Compounds 1-7 were isolated from this plant for the first time. Among them, 1 and 2 were new compounds. Compounds 3-7 were used to assay antioxidant activity, the inhibitory ratios of compounds 3, 4, 6, at a concentration of 1 x 10(-5) mol x L(-1), to malondialdehyde (MDA) produced during microsomal lipid peroxidation induced by ferrous-cysteine were 73%, 69% and 89% respectively.

Wittiorumins A - F, antioxidant diels-alder-type adducts from Morus wittiorum.[Pubmed: 19137498]

Six new Diels-Alder-type adducts, wittiorumins A-F ( 1 - 6) along with the three known compounds chalcomoracin ( 7), mulberrofuran J ( 8), and mongolicin F ( 9), were isolated from the stem bark of Morus wittiorum. Their structures including their absolute configurations were determined on the basis of spectroscopic analysis and chemical methods. Some of the isolated compounds ( 1 - 4) were assayed for their antioxidant activities, among which compounds 1 - 3 were active as antioxidants, with inhibitory ratios of 73.0 %, 82.0 %, and 82.0 %, respectively, at a concentration of 10 ( - 5) M.