Physalin L

Physalins with anti-inflammatory activity are present in Physalis alkekengi var. franchetii and can function as Michael reaction acceptors.[Pubmed:22197662]

Steroids. 2012 Apr;77(5):441-7.

Michael reaction acceptors (MRAs) are a class of active molecules that are directly or indirectly involved in various cellular processes, including the regulation of many signaling pathways. In this study, the inducible nitric oxide synthase (iNOS) assay was used to demonstrate that the dichloromethane extract of Physalis alkekengi var. franchetii (DCEP) possesses anti-inflammatory activity that might be attributed to the modification of key cysteine residues in IKKbeta by the MRAs in DCEP. To isolate these MRAs, glutathione (GSH) was employed, and a simple ultra-performance liquid chromatography/tandem mass spectrometry (UPLC-MS/MS) screening method was developed to investigate the GSH conjugates with potential MRAs. Five physalins, including one new compound isophysalin A (2), together with four known steroidal compounds, physalin A (1), physalin O (3), Physalin L (4) and physalin G (5), were isolated to evaluate the GSH conjugating abilities, and it was indicated that compounds 1, 2 and 3, which had a common alpha,beta-unsaturated ketone moiety, exhibited conjugating abilities with GSH and also showed significant nitric oxide (NO) production inhibiting activities. The anti-inflammatory activities of compounds 1, 2 and 3 might be attributed to their targeting multiple cysteine residues on IKKbeta; therefore, the alkylation of IKKbeta by compound 1 was further studied by micrOTOF-MS. The result showed that six cysteine residues (C(59), C(179), C(299), C(370), C(412), and C(618)) were alkylated, which indicated that IKKbeta is a potential target for the anti-inflammatory activity of physalin A.

[Investigation on quality standard of Franchet groundcherry].[Pubmed:21046739]

Zhongguo Zhong Yao Za Zhi. 2010 Aug;35(16):2103-5.

OBJECTIVE: To develop identification and assay methods of Franchet groundcherry. METHOD: TLC method was used to identify of Physalin L in the sample using high performance silica gel G plate and a mixture of chloroform-acetone-methanol (25:1:1) as a developing solvent. In the chromatogram, Physalin L showed a distinct fluorescence spot under UV 365 nm with good separation. In the HPLC method, luteoloside was separated on a Venusil XBP C18 (4.6 mm x 250 mm, 5 microm) column with acetonitrile-0. 2% phosphoric acid (20:80) as the mobile phase with flow rate of 1 mL x min(-1). The detection wavelength was set at 350 nm. RESULT: For the HPLC quantitation method, the calibration curve of luteoloside displayed ideal linearity over the range of 0.50-249.40 mg x L(-1) with the regression equation of Y = 55,313X + 3.1641 (r = 1.000). The average recovery of luteoloside was 98.79% with a RSD of 1.1%. And the intra-day and inter-day precisions were less than 2%. CONCLUSION: The TLC identification and HPLC determination were sensitive, reliable and repeatable and can be applied for the quality evaluation and assessment of Franchet Groundcherry Calyx.