多穗石柯野生甜茶（lithocarpusploystachyusReld）为壳斗科栎属，常绿植物，多以野生状态分布于长江以南，而以湖南雪峰山区一带分布较多。民间常采集多穗石柯野生甜茶嫩叶食用，其茶甘甜清爽，香气浓郁，色泽鲜艳，回味持久，风味独特，有生津止渴，消除疲劳之功效。《本草纲目》中也有栎属植物可食用的记载，中药专著记载：多穗柯野生甜茶能治湿热痢疾，皮肤瘙痒等症，叶煎服可治高血压。从湖南雪峰山区多穗石柯野生甜茶植物中提取天然甜味素(二氢查尔酮)。二氢查尔酮，其甜度相当蔗糖的300倍。它具有多种生理、药理活性，还具有某种程度的抗氧化性、抑制细菌和防腐的作用，安全性好。甜味素经提取、浓缩、分离、精制、喷雾干燥工艺流程。(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.