Chemical constituents of Cassia siamea / 中国中药杂志

A total of ten compounds were isolated from the 90% Et OH extract of Cassia siamea by using various chormatographic techniques,and their structures were established as( 2' S)-2-( propan-2'-ol)-5,7-dihydroxy-benzopyran-4-one( 1),chrobisiamone( 2), 2-( 2'-hydroxypropyl)-5-methyl-7-hydroxychromone( 3), 2,5-dimethyl-7-hydroxychromone( 4), 2-methyl-5-acetonyl-7-hydroxychromone( 5),3-O-methylquercetin( 6),3,5,7,3',4'-pentahydroxyflavonone( 7),luteolin-5,3'-dimethylether( 8),4-( trans)-acetul-3,6,8-trihydroxy-3-methyl-dihydronapht halenone( 9) and 6-hydroxymellein( 10) based on the spectroscopic data.Compound 1 was a new compound,and 3,4,6,8 were isolated from this plant for the first time.

A new isoindole alkaloid from leaves of Cassia siamea / 中国中药杂志

A new isoindole alkaloid (1), has been isolated from the leaves of Cassia siamea by using various chromatographic techniques. Compound 1 is a new compound, determined as 5-(hydroxymethyl)-2-methyl-6-prenylisoindolin-1-one, and it displayed cytotoxicity against NB4, A549, SHSY5Y, PC3 and MCF7 cell lines with IC₅₀ values of 3.2,4.6,2.8,6.4, 2.5 μmol•L⁻¹, respectively.

A new anthraquinone from twigs of Cassia siamea / 中草药

Objective: To study the chemical constituents in the twigs of Cassia siamea. Methods: The chemical constituents in the twigs of C. siamea were isolated by silica gel, MCI-gel resin, Sephadex LH-20 column chromatographies and RP-HPLC methods. Their structures were elucidated by spectroscopic methods, including extensive 1D and 2D NMR techniques. Results: A new anthraquinone, named as cassanthraquinone A (1) was isolated from 95% ethanol extract of the twigs of C. siamea. Conclusion: Compound 1 is a new compound and it displays the cytotoxicity against NB4, SH-SY5Y, PC3, A549, and MCF7 cells with IC50 values of 6.2, 7.8, 3.5, 8.6, and 5.4 μmol/mL, respectively.

Drought induced changes in growth, leaf gas exchange and biomass production in Albizia lebbeck and Cassia siamea seedlings.

Diurnal trends in net photosynthesis rate (PN ), stomatal conductance (gs ), water use efficiency (WUE) and biomass were compared in six-month-old seedlings of Albizia lebbeck and Cassia siamea, under different levels of drought stress. The potted plants were subjected to four varying drought treatment by withholding watering for 7 (D1), 14 (D2) and 25 (D3) days. The fourth group (C) was watered daily and treated as unstressed (control). Species differed significantly (p<0.001) in their physiological performance under varying stress conditions. Higher PN of 11.6 ± 0.05 in control followed by 4.35 ± 0.4 in D1 and 2.83 ± 0.18 @mol m-2 s-1 in D2 was observed in A. lebbeck. A significant (p<0.001) reduction in PN was observed in C. siamea ( C 7.65 ± 0.5 @mol m-2 s-1, D1, 2.56 ± 0.33 @mol m-2 s-1 and D2, 1.4 ± 0.01 @mol m-2 s-1 ) at 9 hr. A positive correlation was seen between PN and gs (A. lebbeck, r2= 0.84; C. siamea, r2= 0.82). Higher WUE was observed in C. siamea (D2, 7.1± 0.18 @mol m-2 s-1; D3, 8.39 ± 0.11 @mol m-2 s-1) than A. lebbeck, (control, 7.58 ± 0.3 @mol m-2 s-1 and D3, 8.12 ± 0.15 @mol m-2 s-1). The chlorophyll and relative water content (RWC) was more in A. lebbeck than C. siamea. Maximum biomass was produced by A. lebbeck than C. siamea. From the study, one could conclude that A. lebbeck is better than C. siamea in adopting suitable resource management strategy and be best suited for the plantation programs in the semi-arid dry lands.