{"id":7553,"date":"2024-08-06T20:29:54","date_gmt":"2024-08-06T20:29:54","guid":{"rendered":"https:\/\/longchangextracts.com\/?p=7553"},"modified":"2024-08-06T20:29:54","modified_gmt":"2024-08-06T20:29:54","slug":"bamboo-shoot-shell-lignin","status":"publish","type":"post","link":"https:\/\/longchangextracts.com\/da\/bamboo-shoot-shell-lignin\/","title":{"rendered":"Effekten af forbehandling med opl\u00f8sningsmiddel med lavt smeltepunkt p\u00e5 strukturen og de fysisk-kemiske egenskaber af lignin fra bambusskud"},"content":{"rendered":"<p>Effekten af forbehandling med opl\u00f8sningsmiddel med lavt smeltepunkt p\u00e5 strukturen og de fysisk-kemiske egenskaber af lignin fra bambusskud<br \/>\nLignin er en amorf naturlig polymer, der dannes ved oxidativ kobling af strukturelle enheder af phenylpropan. Det er en af komponenterne i ikke-vandopl\u00f8selige kostfibre og indeholder aktive grupper som methoxy, phenolhydroxyl, alkoholhydroxyl, carboxyl osv. Det har h\u00f8j biologisk aktivitet. Rodr \u00ed guez gut \u00e9 rrez et al. fandt ud af, at lignin har en st\u00e6rkere adsorptionskapacitet for galdesyrer sammenlignet med cellulose og hemicellulose; Gong et al. fandt ud af, at lignin kan bruges som immobiliseringsb\u00e6rer for alfa-amylase. Lignin har ogs\u00e5 st\u00e6rke biologiske aktiviteter som antioxidant, antibakteriel, UV-resistent, solcreme og hudpleje samt h\u00e6mning af hudkr\u00e6ft. Det har god biokompatibilitet og har potentiale til at blive anvendt i f\u00f8devare- og kosmetikindustrien.<br \/>\nIndtil videre har der v\u00e6ret en r\u00e6kke kemiske, mekaniske og biologiske forbehandlingsteknikker til ligninekstraktion, herunder dampeksplosion, forbehandling med organisk opl\u00f8sningsmiddel og forbehandlingsmetoder med dybt eutektisk opl\u00f8sningsmiddel (DES). Kemiske metoder til udskillelse af lignin kr\u00e6ver dog st\u00e6rke syrer eller baser og h\u00f8je temperaturer og tryk, hvilket kan for\u00e5rsage milj\u00f8forurening. Biologiske metoder er ofte begr\u00e6nset af usikkerheden omkring temperatur og biologisk aktivitet. DES, ogs\u00e5 kendt som lavsmeltende opl\u00f8sningsmidler eller ioniske v\u00e6sker, er en lavsmeltende blanding, der best\u00e5r af hydrogenbindingsdonorer og -acceptorer. Ma et al.s forskning har vist, at DES-opl\u00f8sningsmidler ikke kun effektivt opl\u00f8ser lignin, men ogs\u00e5 n\u00e6sten ikke opl\u00f8ser cellulose. P\u00e5 grund af sine fysiske og kemiske egenskaber har DES-opl\u00f8sningsmidlet et smeltepunkt, der er lavere end nogen af dets komponenter, og er et flydende eutektisk system ved stuetemperatur. DES-opl\u00f8sningsmiddel betragtes som en effektiv metode til at reducere den fysiske barriere af lignocellulose og har fordelene ved enkel forberedelse, gr\u00f8n milj\u00f8beskyttelse og omkostningseffektivitet.<br \/>\nDES kan inddeles i tre typer baseret p\u00e5 pH: neutral, sur og alkalisk. Tan et al. sammenlignede og analyserede ekstraktionseffekterne af neutrale, sure og alkaliske DES p\u00e5 lignin fra oliepalmens tomme frugtskaller og fandt, at sure DES havde en st\u00e6rkere ekstraktionseffekt end de to andre. I sure DES fandt Tan et al., at sammenlignet med cholinchlorid-m\u00e6lkesyre-DES indeholder lignin udvundet af cholinchlorid-m\u00e6lkesyre-DES mange \u03b2-O-4-bindinger og flere biologisk aktive steder. Strukturen af cholinklorid-myrsyre-lignin er dog mere beskadiget, hvilket resulterer i flere kondensationsstrukturer. Derfor er lignin udvundet af cholinchlorid-m\u00e6lkesyre-DES mere velegnet til yderligere anvendelse. Der er dog i \u00f8jeblikket kun lidt forskning i anvendelsen af DES-opl\u00f8sningsmidler i r\u00e5materialer fra bambusskud til udvinding af lignin. Sichuan-provinsen har rigelige bambusressourcer, hvoraf dyrkningsomr\u00e5det i Zizhu har n\u00e5et 100.000 hektar, hvilket genererer enorme m\u00e6ngder affald af bambusskaller hvert \u00e5r. I denne unders\u00f8gelse blev bambusskallen fra Neosinocalamus affinis derfor brugt som eksperimentelt r\u00e5materiale, og forskellige betingelser for DES-opl\u00f8sningsmiddel (molforholdet mellem cholinchlorid og m\u00e6lkesyre er henholdsvis 1:3, 1:6, 1:9) og temperatur (90, 110, 130 \u2103) blev brugt til at forbehandle lignin, og derefter blev den malede lignin og DES-opl\u00f8sningsmiddelforbehandlet lignin sammenlignet og analyseret ved gelkromatografi, infrar\u00f8d spektroskopi, fosforspektrum, termogravimetrianalyse, at udforske strukturen og den termiske stabilitet af lignin udvundet af DES og yderligere unders\u00f8ge styrken af antioxidantaktivitet for at finde den passende andel af DES-opl\u00f8sningsmiddel og temperaturforhold til udvinding af lignin for at give en ny retning for h\u00f8jv\u00e6rdiudnyttelse af bambusskalressourcer.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7554\" src=\"https:\/\/longchangextracts.com\/wp-content\/uploads\/2024\/08\/1-314.png\" alt=\"\" width=\"340\" height=\"320\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7555\" src=\"https:\/\/longchangextracts.com\/wp-content\/uploads\/2024\/08\/2-266.png\" alt=\"\" width=\"350\" height=\"218\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7556\" src=\"https:\/\/longchangextracts.com\/wp-content\/uploads\/2024\/08\/3-251.png\" alt=\"\" width=\"344\" height=\"241\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7557\" src=\"https:\/\/longchangextracts.com\/wp-content\/uploads\/2024\/08\/4-231.png\" alt=\"\" width=\"338\" height=\"365\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7558\" src=\"https:\/\/longchangextracts.com\/wp-content\/uploads\/2024\/08\/5-207.png\" alt=\"\" width=\"666\" height=\"295\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7559\" src=\"https:\/\/longchangextracts.com\/wp-content\/uploads\/2024\/08\/6-190.png\" alt=\"\" width=\"708\" height=\"260\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7560\" src=\"https:\/\/longchangextracts.com\/wp-content\/uploads\/2024\/08\/7-174.png\" alt=\"\" width=\"351\" height=\"252\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7561\" src=\"https:\/\/longchangextracts.com\/wp-content\/uploads\/2024\/08\/8-155.png\" alt=\"\" width=\"353\" height=\"213\" \/><br \/>\nDenne unders\u00f8gelse brugte cholinchlorid\/m\u00e6lkesyre som et opl\u00f8sningsmiddel med lavt smeltepunkt til at udvinde CC-LA lignin. Under milde forhold: cholinklorid\/m\u00e6lkesyre=1:6, temperatur 110 \u00b0C, var ligninudbyttet 62,32%, hvilket var h\u00f8jere end andre opl\u00f8sningsmidler med lavt smeltepunkt. Dette kan skyldes, at cholinchlorid\/m\u00e6lkesyre-DES-opl\u00f8sningen har en st\u00e6rkere separationsevne for Poaceae-r\u00e5materialer, langt h\u00f8jere end udbyttet af MWL (13,4%), hvilket indikerer, at denne ekstraktionsmetode er velegnet til ekstraktion af lignin fra bambusskaller. Molekylv\u00e6gten af CC-LA lignin er relativt lav med PDI&lt;2 og god ensartethed, hvilket indikerer, at de kemiske bindinger p\u00e5 lignin-makromolekyler er brudt efter forbehandling med opl\u00f8sningsmidler med lavt smeltepunkt. Gennem FI-TR- og 31P-NMR-analyse blev det konstateret, at CC-LA lignin indeholder flere polyphenoliske hydroxylgrupper og har god termisk stabilitet. Sammenlignet med kommercielle antioxidanter har det h\u00f8jere antioxidantaktivitet, fordi lignins antioxidantaktivitet er positivt korreleret med indholdet af phenoliske hydroxylgrupper. Derfor har CC-LA lignin potentiale til at blive anvendt som antioxidant i f\u00f8devarer, l\u00e6gemidler og kosmetik.<\/p>","protected":false},"excerpt":{"rendered":"<p>The effect of low melting point solvent pretreatment on the structure and physicochemical properties of bamboo shoot shell lignin Lignin is an amorphous natural polymer formed by oxidative coupling of phenylpropane structural units. It is one of the components of non water soluble dietary fiber and contains active groups such as methoxy, phenolic hydroxyl, alcohol [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The effect of low melting point solvent pretreatment on the structure and physicochemical properties of bamboo shoot shell lignin - China Chemical Manufacturer<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangextracts.com\/da\/bamboo-shoot-shell-lignin\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The effect of low melting point solvent pretreatment on the structure and physicochemical properties of bamboo shoot shell lignin - China Chemical Manufacturer\" \/>\n<meta property=\"og:description\" content=\"The effect of low melting point solvent pretreatment on the structure and physicochemical properties of bamboo shoot shell lignin Lignin is an amorphous natural polymer formed by oxidative coupling of phenylpropane structural units. 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