滇山茶花和巖棕的化學成分研究.pdf

1、蘭州大學碩士學位論文滇山茶花和巖棕的化學成分研究姓名：楊甲月申請學位級別：碩士專業(yè)：植物學指導教師：孫繼周楊崇仁20060501ABSTRACTTheflowersofCamelliareticulatahavebeenfoundapplicationforfolkmedicineasfldiuretic，ahaemostaticandallastringentinChinaandJapanDetailedchemicalinvesti

2、gationofthefreshflowersextracthasresultedintheisolationoffournewacetylatedkaempferolglycosides，namelyKaempferol3OBDglucopyranosyl(6_1)一2，3O—acetyl—U—L—rhamnopyranosyl(4_1)一2’，37，4‘一O—acetyl一伍一L—rhamnopyranosideKaempferol

3、3O—p—Dglucopyranosyl(6_1)2，3一Oacetyl廿L—rharmmpyranosyl一(4_1)一27，3’Oacetyl一旺一LrharnnopyranosideKaempferol3O—pDglucopyranosyl一(6_1)2，3Oacetyl一旺一L—rhamnopyranosyl一(4_1)一2一O—acetyl—a—L—rhamnopyranosideKaempferol3一O—p—D—gluco

4、pyranosyl一(6_1)2，3一0一acetyl一Ⅱ一L—rhamnopyranosyl(4一1)U—Lrhamnopyranoside，togetherwithfourknowncompoundsThispaperdescribesthestructureelucidationofthenewcompoundsonthebasisofspectroscopicmethodsandtheantioxidantactivityoft

5、heseisolatedcompoundsonDPPHradicalscavengingassayHydrolysabletanninsshowedmuchmoreeffectiveantioxidantactivityinDPPHassaywhileacetylatedkaempferolglycosidesdisplayedverylowactivityDracaenacambodianaisasmallherbofgenusDra

6、caenaabundanceofsteroidalsaponinsinitsstemarouseourinterestininvestigationonitschemicalconstituentsAsaresultofstudyinchemicalconstituent，twosteroidalsaponinsandtwophenolicglucosidewereencountered，namely26一O一13一D—glucopyr

7、anosylfurosta5，20(22)，25(27)一triene一1p，3p，26triol一1O一[00【一Lrhamnopyranosyl一(1_2)一旺一L—arabinopyranoside]26一O一13一Dglucopyranosyl一22一O—methoxylfurosta5，25(27)diene113，3B，22l，26tetrol1O(O—c【一Lrhamnopyranosyl(1_2)c【Larabinopy

8、ranoside1hydroxy一34，5一tfimethoxyphenyl1一OpD—apiofuranosyl一(1_6)一O—p—Dglucopyranoside40pDglucopyranosylphenethylalcoh01Thedetailsoftheirstructuralelucidationonthebasisofspectroscopicmethodsespeciallybynleansof2DNMR(eg1H_l