2LIU F F,ANG C Y,SPRINGER D. Optimization of extraction condi- tions for active components in Hypericum peoCoratum using response surface methodology[ J]. J Agric Food Chem, 2000, 48(8) :3364 - 3371.
3CONSTANTINE G H, KARCHESY J. Variations in hypericin concentration in Hypericum L. and commercial products [ J ]. Pharm Biol, 1998,36 (5) :365 - 367.
4KIRAKASYAN A B, VARDAPETYAN R R, CHARCHOGLYAN A G. The content of hypericin and pseudohy pericin in cell cultures of Hypericum perforatum [ J ]. Russ J Plant Physiol, 2000,47 ( 2 ) : 270 - 273.
5KITANOV G M. Hypericin and pseudohypericin in some Hypericum species[J]. Biochem Syst Ecol, 2001,29(2) :171 -178.
6SEIDLER- LOZYKOWSKA K, DABROWSKA J, ZYGMUNT B. Content of active substances in herb of St. John' s wort ( Hypericum perforatum L. ) var. Toraz in different vegetation phases [ J ]. Herba Pol,1999,45(3) :169 - 172.
7SOUTHWELL I A, CAMPBELL M H. Hypericin content variation in Hypericum perforatum in Australia [ J ]. Phytochemistry, 1991,30 (2) :475 -478.
8POUTARAUD A,DIGREGORIO F,TIN V C. et,al. Effect of light on hypericins contents in Fresh Flowering top parts and in an extract of St. John's Wort( Hypericum perforatum) [ J ]. Planta Med ,2001, 67 ( 3 ) :254 - 259.
9KOVAC - BESOVIC E E,LMAMOVIC J. Determination of hypericin and rutin in St. John' wort,Hypericum perforatum L. by thin lay- er chromatography [ J ]. Farm Glas, 2000,56 ( 2 ) : 37 - 43.
10MICHELITSCH A,BIZA B,WURGLICS M,et al. Determination of hypeficin in herbal medicine products by differential pulse polarography[ J]. Phytochem Anal,2000,11 ( 1 ) :41 - 44.
