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1、現(xiàn)代食品科技ModernFoodScienceandTechnology2015,Vo1.31,No.3改性竹筍纖維水凝膠的制備與表征及其對亞甲基藍吸附性能研究羅文超,劉淑敏,黃惠華(華南理工大學輕工與食品學院,廣東廣州510640)摘要:以竹筍下腳料為原料提取纖維素并進行改性后,添加K-卡拉膠并在環(huán)氧氯丙烷交聯(lián)下通過反相懸浮聚合法,成功制備出pH敏感型竹筍復合水凝膠,并使用FT-IR、熱重分析、掃描電鏡對該復合水凝膠進行表征,研究水凝膠的溶脹性能與動力學,并以亞甲基藍為模型藥物分子,研究不同初始濃度和初始pH對水凝膠吸附性能影響。實驗發(fā)現(xiàn):改性竹筍
2、纖維素與K.卡拉膠發(fā)生化學交聯(lián),形成具有固定分解溫度的三維網(wǎng)狀結(jié)構水凝膠。該復合水凝膠由于其帶負電荷側(cè)鏈基團在不同pH溶液中靜電斥力的差異不同使得其溶脹行為具有pH敏感性,在溶脹初始階段服從Fickian擴散,在整個階段符合Scho~模型。復合水凝膠具有多孔性能和溶脹性能,使其具有較強吸附性能,吸附實驗發(fā)現(xiàn)該復合水凝膠對模型藥物亞甲基藍吸附性能良好,該復合水凝膠在藥物吸附與緩釋領域具有潛在應用價值。關鍵詞:竹筍下腳料;卡拉膠;水凝膠;表征;吸附文章篇號:1673.9078(2015)3—165—171DOI:10.13982~.mfst.1673—9
3、078.2015.3.028PreparationandCharacterizationofModifiedBambooCeluloseHydrogelandAnalysisofItsAdsorptionCapacitytoMethyleneBlueLUOWen-chao.LIUShu.mil1.HUANGHui-hua(CollegeofLightIndustryandFoodSciences,SouthChinaUniversityofTechnology,Guangzhou510640,China)Abstract:Acompositehydr
4、ogeldisplayingpHsensitivitywassuccessfullypreparedfrombamboocelluloseextractedfrombambooof-cuts,withaddedK—can-ageenan(K—CN)byinversesuspensionpolymerization,andusingepichlorohydrin(ECH)asacrosslinkingagent.Thepreparedcompositehydrogelsandtheftswellingkineticswerecharacterizedb
5、yFouriertransforminfraredspec~oscopy(FT-IR),thermo—gravimetricanalysis,andscanningelectronmicroscopy~Inaddition,methylenebluewasusedasamodeldrugmoleculetostudytheefectsofdiferentinitialconcentrationsandinitialpHvaluesontheadsorptioncapacityofthehydroge1.Theresultsoftheseanalyse
6、sshowedthatmodifiedbamboocelluloseand~:-CNunderwentchemicalcross-linking,formingahydrogelwithathree—dimensionalnetworkstructurewithafixeddecompositiontemperature.ThehydrogelshowedpH—sensitiveswellingbehavio~causedbythevariationsinelectrostaticrepulsionexhibitedbyitsnegatively-c
7、hargedsidechaingroupsinsolutionswithvaryingpH.TheinitialswellingphasecompliedwiththeFickiandifusionmode1.whiletheentireswellingprocesscompliedwiththeSchoRmode1.Thehydrogelwasporousanddisplayedswellingcapacity,whichenabledittoexpresshighadsorptioncapacity.Theadsorptiontestshowed
8、ithadahighadsorptioncapacitytothemodeldrug(methylenebl