γ-Fe2O3磁粉以及以它為基體而支撐的鈷改性γ-Fe2O3磁粉至今仍是用量最大的磁記錄介質(zhì)材料。目前的生產(chǎn)工藝主要有兩種,一種是堿性法,由Fe2+鹽加堿空氣氧化成針狀α-FeOOH,然后脫水成為α-Fe2O3,再經(jīng)還原、氧化為γ-Fe2O3;另一種是酸性法...[繼續(xù)閱讀]

    低聚糖由于其在體內(nèi)具有獨(dú)特的消化、吸收、發(fā)酵和代謝作用,而被廣泛用于保健食品等領(lǐng)域。由于具有良好的免疫系統(tǒng)調(diào)節(jié)作用,使其在免疫性疾病的治療方面表現(xiàn)出良好的應(yīng)用前景。目前低聚糖主要是從天然產(chǎn)物中提取或通過生物...[繼續(xù)閱讀]

    1.1概論隨著食品工業(yè)的發(fā)展,食品添加劑的生產(chǎn)已成為食品工業(yè)不可缺少的組成部分。1991年輕工業(yè)部已把食品添加劑獨(dú)立列為主要輕工業(yè)產(chǎn)品之一,可見我國的食品添加劑已形成一定的規(guī)模并在整個(gè)國民經(jīng)濟(jì)中占有一席之地。所謂食...[繼續(xù)閱讀]

    Dimethylfumarate(DMF)isoneoftheestersofshort-chainalkenoicacids.TheantifunguspropertyofDMFhasbeenreported.Inthispaper,itwasinvestigatedbydeterminingitsminimuminhibitoryconcentrations(MIC)onmicrobe.Twentykindsofmicrobeweretestedinourexperiments.Theyaretwel...[繼續(xù)閱讀]

    TherhizomeofZingiberofficinalealsoknownasgingerisoneofthemostpopularspicesandisatraditionalChinesemedicineaswell.Theantioxidantactivityhasbeenwellinvestigated.Thelipophylicantioxidantconstituentswereshowntobeshogaol,gingerols,gingerdiols,diarylheptanoids....[繼續(xù)閱讀]

    超臨界CO2萃取技術(shù)是20世紀(jì)70年代迅速發(fā)展起來的一種新型分離技術(shù),具有萃取率高、分離效果好等優(yōu)點(diǎn)。國內(nèi)外文獻(xiàn)均有利用超臨界CO2技術(shù)萃取迷迭香、紅根草、百里香、荊芥、馬郁蘭、牛至和紫蘇等植物的有效抗氧化成分的報(bào)道。...[繼續(xù)閱讀]

    Anticoagulantshavebeenwidelyusedbothclinicallyandinvitromedicaltreatments.Inclinicalpractice,theyarethedrugsofchoiceforthepreventionandtreatmentofthromboembolicdisorders,andprophylaxisofthromboticeventsbothpre-andpost-surgery.Itisestimatedthat2～4patientso...[繼續(xù)閱讀]

    Polysaccharidesulfates(PS)areglycanderivativeswithsomehydroxylgroupssubstitutedbysulfategroups.Theyhaveavarietyofbiologicalactivities,amongwhich,theanticoagulationactivityisofspecialinterest.NaturallyoccurringPS,especiallythemarineglycan,arethemainsourceo...[繼續(xù)閱讀]

    保濕研究是化妝品學(xué)、皮膚醫(yī)學(xué)的熱點(diǎn)。保濕劑在化妝品中的作用是維持或增加皮膚角質(zhì)層的水含量,改善因角質(zhì)層缺水導(dǎo)致的皮膚干燥及由此產(chǎn)生的發(fā)癢、脫屑等臨床癥狀。保濕劑按其來源可分為天然保濕劑和合成保濕劑,按其作用...[繼續(xù)閱讀]

    Spirulinaplatensishaslongbeengrownphotoautotrophicallyinopenpondsforproductionofhealthfoodbecauseofitshighcontentofproteinandothernutritionalelements,inwhichcellconcentrationswerelow(typically0.4～0.8g/L).Morerecently,muchattentionhasbeendrawntothepotentia...[繼續(xù)閱讀]