多穗石柯野生甜茶（lithocarpusploystachyusReld）為殼斗科櫟屬，常綠植物，多以野生狀態(tài)分布于長(zhǎng)江以南，而以湖南雪峰山區(qū)一帶分布較多。民間常采集多穗石柯野生甜茶嫩葉食用，其茶甘甜清爽，香氣濃郁，色澤鮮艷，回味持久，風(fēng)味獨(dú)特，有生津止渴，消除疲勞之功效?！侗静菥V目》中也有櫟屬植物可食用的記載，中藥專著記載：多穗柯野生甜茶能治濕熱痢疾，皮膚瘙癢等癥，葉煎服可治高血壓。從湖南雪峰山區(qū)多穗石柯野生甜茶植物中提取天然甜味素(二氫查爾酮)。二氫查爾酮，其甜度相當(dāng)蔗糖的300倍。它具有多種生理、藥理活性，還具有某種程度的抗氧化性、抑制細(xì)菌和防腐的作用，安全性好。甜味素經(jīng)提取、濃縮、分離、精制、噴霧干燥工藝流程。(WithdrawsthenaturalsweetmonosodiumglutamatefromtheHunanXuefangwildsweettea)Themanyearoftanoakwildsweettea(lithocarpusploystachyusReld)isthefagaceaeoak,theevergreenplant,manydistributesbythewildconditionsouthofYangtzeRiver,butdistributesmanybyHunansnowypeakmountainousarea.Thefolkoftengathersmanyearoftanoakwildsweetteatenderleafedible,itsteasweetneat,thefragranceisrich,thelusterisbright,theaftertasteislasting,theflavorisunique,hasinducessalivaandslakesthirst,effectoftherelievefstigue. NativeChinesePlants alsohastheoakplanttobepossibletheediblerecord,thetraditionalChinesemedicinemonographrecord:Themanyearoftanoakwildsweetteacantreatthehotanddampdysentery,theskinpruritusandsoonsickness,YeJiantheclothingmaytreathypertension.WithdrawsthenaturalsweetmonosodiumglutamatefromHunansnowypeakmountainousareamanyearoftanoakwildsweetteaplant(dihydroZhaalkone).DihydroZhaalkone,itssweetnesssuitablesucrose300times.Ithasmanykindsofphysiologies,pharmacologyactiveness,butalsohassomekindofdegreeoxidationresistance,tosuppressthebacteriumandtheanticorrosionfunction,thesecurityisgood.Sweetmonosodiumglutamateafterextraction,concentration,separation,purification,spraydryingtechnicalprocess.