功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2014年
13期
13071-13075
,共5页
张盛明%刘亮%马艳丽%方桂珍
張盛明%劉亮%馬豔麗%方桂珍
장성명%류량%마염려%방계진
碱木质素%SO4 2-/ZrO2%还原反应%活化%抗氧化性
堿木質素%SO4 2-/ZrO2%還原反應%活化%抗氧化性
감목질소%SO4 2-/ZrO2%환원반응%활화%항양화성
alkali lignin%SO4 2-/ZrO2%deoxidization reaction%activate%antioxidant activity
采用自制SO42-/ZrO2固体酸催化剂,在氢还原体系中对碱木质素进行活化,以化学法对活化前、后碱木质素的官能团含量进行定量分析,利用 DPP H自由基清除率、超氧阴离子自由基清除能力和还原力对碱木质素的抗氧化性能进行评价.结果表明,活化后碱木质素的总羟基和酚羟基含量分别达到9.39%和3.32%,较反应前提高55.98%和15.28%;碱木质素在浓度为0.005~0.160 mg/mL 范围内,对 DPPH 自由基有较强的清除能力,活化后碱木质素对自由基清除率可达80.56%,较反应前提高4.61%;碱木质素在浓度为0.0025~0.080 mg/mL 范围内,对超氧阴离子清除能力较弱;碱木质素在浓度0.002~0.060 mg/mL范围内,活化后碱木质素的还原力较活化前有所提高;碱木质素可以作为天然高分子抗氧化剂进行开发.
採用自製SO42-/ZrO2固體痠催化劑,在氫還原體繫中對堿木質素進行活化,以化學法對活化前、後堿木質素的官能糰含量進行定量分析,利用 DPP H自由基清除率、超氧陰離子自由基清除能力和還原力對堿木質素的抗氧化性能進行評價.結果錶明,活化後堿木質素的總羥基和酚羥基含量分彆達到9.39%和3.32%,較反應前提高55.98%和15.28%;堿木質素在濃度為0.005~0.160 mg/mL 範圍內,對 DPPH 自由基有較彊的清除能力,活化後堿木質素對自由基清除率可達80.56%,較反應前提高4.61%;堿木質素在濃度為0.0025~0.080 mg/mL 範圍內,對超氧陰離子清除能力較弱;堿木質素在濃度0.002~0.060 mg/mL範圍內,活化後堿木質素的還原力較活化前有所提高;堿木質素可以作為天然高分子抗氧化劑進行開髮.
채용자제SO42-/ZrO2고체산최화제,재경환원체계중대감목질소진행활화,이화학법대활화전、후감목질소적관능단함량진행정량분석,이용 DPP H자유기청제솔、초양음리자자유기청제능력화환원력대감목질소적항양화성능진행평개.결과표명,활화후감목질소적총간기화분간기함량분별체도9.39%화3.32%,교반응전제고55.98%화15.28%;감목질소재농도위0.005~0.160 mg/mL 범위내,대 DPPH 자유기유교강적청제능력,활화후감목질소대자유기청제솔가체80.56%,교반응전제고4.61%;감목질소재농도위0.0025~0.080 mg/mL 범위내,대초양음리자청제능력교약;감목질소재농도0.002~0.060 mg/mL범위내,활화후감목질소적환원력교활화전유소제고;감목질소가이작위천연고분자항양화제진행개발.
In this study,laboratory-prepared SO4 2-/ZrO2 catalysts were used for the reduction of alkali lignin by hydrogen in order to increase alkali lignin activity,and the active functional groups of alkali lignin were analyzed by chemical method,the antioxidation abilities of alkali lignin was evaluated on DPPH radicals scavenging,su-peroxide anion radicals scavenging and reducing power.Results showed that the contents of total hydroxyl and phenolic hydroxyl of alkali lignin after reaction were 9.39% and 3.32%,with an increase of 55.98% and 15.28%respectively compared with the original alkali lignin,both alkali lignin and its reduced products had strong radi-cal scavenging activity against DPPH at a concentration ranging from 0.005 to 0.160 mg/mL in reaction system, the maximum DPPH free radical scavenging rates of activated alkali lignin were 80.91%,with an increase of 4.61% compared with the original alkali lignin,alkali lignin had low radical scavenging activity against superox-ide anion at a concentration ranging from 0.0025 to 0.080 mg/mL in reaction system,the reducing power of al-kali lignin after reaction was enhanced at a concentration ranging from 0.002 to 0.060 mg/mL in reaction sys-tem.Alkali lignin could be used as natural antioxidant.