![bruker apex iii -ii bruker apex iii -ii](https://www.tmj.eg.net/articles/2017/14/3/images/TantaDentJ_2017_14_3_129_214320_f1.jpg)
Antioxidant activities of 14 compounds were determined by DPPH radical-scavenging assay and Trolox equivalent antioxidant capacity assay, and the results showed that four compounds, protocatechuic acid (4), 2α,3α-epoxy-5,7,3′,4′-tetrahydroxyflavan-(4β-8-catechin ( 5), 2α,3α-epoxy-5,7,3′,4′-tetrahydroxyflavan-(4β−8)-epicatechin (6), 2β,3β-epoxy-5,7,3′,4′-tetrahydroxyflavan-(4α-8)-epicatechin ( 7), exhibited moderate antioxidant activities. Single crystal X-ray diffraction measurements were carried out at a low temperature employing a (three circle or kappa) Bruker-AXS (Quest or Venture) with IµS source and a Photon III area detector diffractometer for (Mo K radiation, 0.71073 Å or Cu K radiation, 1.54178 Å) (NSF-CHE-9807975, NSF-CHE-0079822 and NSF-CHE-0215838). X-ray crystallographic data were collected on Bruker Nonius Smart Apex III X-ray Single crystal diffractometer (CCD) or on Oxford SuperNova microfocus X-ray diffractometer with graphite-monochromatized Mo-Ka radiation. UVVis absorp-tion spectra were recorded using a Shimadzu UV-2550 spectropho-tometer. Their structures were mainly elucidated on the basis of NMR, MS, IR, CD and UV spectral evidences. Mass spectra were measured on a Bruker BIFLEX III mass spectrophotometer or Bruker Apex IV FTMS.
![bruker apex iii -ii bruker apex iii -ii](https://i.ytimg.com/vi/d-xu82DlYJ4/maxresdefault.jpg)
![bruker apex iii -ii bruker apex iii -ii](https://www.rhinotradellc.com/wp-content/uploads/imported/8/Bruker-AXS-Smart-Apex-Single-Crystal-X-Ray-Diffractometer-882-013700-Goniometer-184696207048-2-300x300.jpg)
In the present study, chemical investigation of the 95% ethanol extract of Litchi chinensis seeds led to the isolation of four new compounds, 2α,3α-epoxy-5,7,3′,4′-tetrahydroxyflavan-(4β-8-catechin) ( 5), 2β,3β-epoxy-5,7,3′,4′-tetrahydroxyflavan-(4α-8-epicatechin) ( 7), litchiol A ( 9) and litchiol B ( 12), together with 11 known ones, 2,5-dihydroxy-hexanoic acid (1), soscopoletin (2), coumaric acid (3), protocatechuic acid (4), 2α,3α-epoxy-5,7,3′,4′-tetrahydroxyflavan-(4β−8)-epicatechin (6), pterodontriol d-6- O-β- d-glucopyranoside (8), Narirutin (10), naringin (11), dihydrocharcone-4′- O-β- d-glucopyranoside ( 13), pinocembrin-7-rutinoside (14), pinocembrin-7-neohesperidoside (15). Berberine, chelerythrine and sanguinarine were chromatographically quantified as described by Guízar-González et al. Samples were directly injected using ESI and APCI at a flow rate of 600L per hour. Powder XRD was performed using a Bruker D8 Advance diffractometer operating with Cu K radiation in the 2 range 1070°. Data processing, structure solution, and refinement were done using the Bruker Apex III software. Finally click on Activate Selected Licenses Now. The samples were cooled to 100 K with a nitrogen flow from an Oxford Cryosystems Cryostream Plus. Litchi ( Litchi chinensis Sonn.) is widely accepted as a delicious fruit in China and its seeds have been commonly used in traditional Chinese medicine to relieve neuralgic pain. a Bruker Apex III ion resonance mass spectrophotometer (Bruker Daltonics Inc., Billerica, MA, USA) and comparing with reported values (Liscombe et al., 2009). All analyses were performed on a Bruker Dal-tonics APEX III FTICR-MS equipped with a 7.0 T actively shielded superconducting magnet (Bruker Dal-tonics, MA, USA). change this selection unless instructed otherwise e.g.