CN105885049B - 一种α-鹅膏毒肽分子印迹材料制备方法 - Google Patents
一种α-鹅膏毒肽分子印迹材料制备方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
- C08G75/02—Polythioethers
- C08G75/04—Polythioethers from mercapto compounds or metallic derivatives thereof
- C08G75/045—Polythioethers from mercapto compounds or metallic derivatives thereof from mercapto compounds and unsaturated compounds
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- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J2201/042—Elimination of an organic solid phase
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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Abstract
一种α‑鹅膏毒肽分子印迹材料制备方法,涉及分离材料领域看,包括以下步骤:S1将模板分子与功能单体、交联剂、溶剂混匀;S2将载体表面进行巯基化处理;S3将S2处理得到的载体加入S1制得的混合溶液中,与功能单体交联聚合;S4将模板分子从聚合后的载体表面洗脱;S5将S4处理得到分子印迹材料真空干燥。本发明实验操作简便,无须通氮、除氧,且用三乙胺调节反应体系pH值即可引发反应,反应条件温和,时间短,此方法较传统制备分子印迹方法表现出极大的优越性。
Description
技术领域
本发明涉及一种分离材料,尤其涉及一种α-鹅膏毒肽分子印迹材料制备方法。
背景技术
鹅膏毒肽又名鹅膏毒素,英文名为amanitin,是从剧毒磨菇中分离出来的一种多肽物质,也是一类重要生化试剂,鹅膏毒素在分子生物学、发育生物学、遗传学、生物化学、医学、生物防治等领域具有广泛的应用价值。鹅膏毒肽是一类双环八肽,已分离纯化的天然鹅膏毒肽毒素有9种,它们是α-amanitin,β-amanitin,γ-amanitin,ε-amanitin,amanin,amaninamide,amanullin,amanullinic acid,和proamanullin。其中α-amanitin的结构式如下:
分子印迹是集分析化学、高分子材料及仿生生物工程等多学科发展起来的新型“人工受体”合成技术。目前分子印迹技术最成功的应用是识别有机小分子,用于识别多肽及蛋白质的成功实例非常有限,其原因是生物大分子结构复杂及热力学因素等,另一主要原因是多肽和蛋白质价格昂贵,通常难以获得足够量用于制备分子印迹聚合物。
MIP分子印迹材料,相对于NIP分子印迹材料,有更高的吸附容量和更好的选择性,但传统的聚合方式实验操作复杂,条件苛刻,需无氧环境,并且后续处理过程相对冗长、费时费力、颗粒均一性较差、原料利用率较低。因此,寻求一种简单高效制备α-鹅膏毒肽分子印迹材料(α-amanitin-MIP)的制备方法至关重要。
发明内容
针对上述技术问题,本发明提供一种α-鹅膏毒肽分子印迹材料制备方法,包括以下步骤:
S1:将模板分子与功能单体、交联剂、溶剂混匀;
S2:将载体表面进行巯基化处理;
S3:将S2处理得到的载体加入S1制得的混合溶液中,通过功能单体与模板分子交联聚合;
S4:用洗脱液将模板分子从聚合后的载体表面洗脱,得到分子印迹材料;
S5:将S4处理得到分子印迹材料真空干燥;
其中,S3步骤中的聚合条件为:用碱将聚合反应液pH调至7~9,40℃~50℃下反应6~12h;所述模板分子为N-乙酰色氨酸丙酰胺。
以α-鹅膏毒肽分子的一个作用位点,设计合成了α-鹅膏毒肽的特异性识别决定区作为模板,利用表面印迹法,在二氧化硅载体上修饰制备了专一性吸附鹅膏毒肽的印迹材料。
具体地,所述S1中功能单体为3-巯基丙酸;所述交联剂为乙二醇二甲基丙烯酸酯;所述溶剂为二甲基亚砜。
具体地,所述S1中模板分子与功能单体的摩尔比例为0.15:1~0.25:1,所述功能单体与交联剂的摩尔比例为1:2。
具体地,所述S1中模板分子、功能单体、交联剂的摩尔比例为0.2:1:2。
具体地,所述S1中还包括辅助交联剂,所述辅助交联剂为季戊四醇四-3-巯基丙酸酯,,所述辅助交联剂与交联剂的摩尔比例为9:4。
具体地,所述S2中的巯基化处理方法包括如下步骤:
S2a:取载体,溶于水中,加甲醇超声使其分散;
S2b:向S2a得到的反应液中加入甘油,再超声,超声后通入氮气;
S2c:取(3-巯丙基)-三乙氧基硅烷与甲醇混合均匀,加入S2b得到的反应液中,搅拌使其混合均匀;
S2d:向S2c得到的反应液中加入氨水,85℃氮气保护下反应1h后,停止氮气,再反应5h;
S2e:反应结束后离心收集载体,用无水乙醇和去离子水分别洗涤,40℃下真空干燥即得。
具体地,所述S3中的碱为三乙胺。
具体地,步骤S4中所述洗脱液分为第一洗脱液和第二洗脱液,第一洗脱液为甲醇与乙酸的体积比为9:1的混合溶液,第二洗脱液为甲醇。
具体地,所述S5中的真空干燥温度为40~50℃。
本发明采用藉配体识别决定区印迹策略,利用抗原决定基(短肽片段)印迹,制备识别多肽和蛋白质的MIPs。利用硫醇-烯点击反应制备分子印迹聚合物,实验操作简便,无须通氮、除氧,且用三乙胺调节反应体系pH值即可引发反应,反应条件温和,时间短,此方法较传统制备分子印迹方法表现出极大的优越性。
本发明解决MIPs识别生物大分子过程中的传质速率慢和吸附容量较低等问题,拟采用硅小球表面印迹法和沉淀聚合印迹法等,研制具有纳米结构的表面印迹微球和MIPs纳米粒子,制备性能优异的新型分离材料。
与现有技术相比,本发明的有益效果是:本发明旨在选择鹅膏毒肽的一个识别位点,设计合成鹅膏毒肽的特异性识别决定区作为模板,采用巯基化二氧化硅微球,并利用表面印迹的方法,通过巯基与双键之间的点击反应在二氧化硅表面合成了α-鹅膏毒肽-MIP分子印迹材料。
为了更好地理解和实施,下面详细说明本发明。
具体实施方式
实施例1:模板分子的制备
本发明的模板分子为N-乙酰色氨酸丙酰胺,其制备方法包括以下步骤:
a、称取4.0g的N-乙酰色氨酸,量取100ml甲醇加入250ml的三颈烧瓶中在超声环境下溶解充分;
b、在上述步骤的混合溶液中加入5.0ml的浓硫酸作为催化剂,于60℃的水浴环境下回流3个小时,使N-乙酰色氨酸和甲醇酯化充分;
c、待装置完全冷却至室温后,利用1.0mol/L的K2CO3溶液调节混合液的pH为7,然后加入饱和NaCl溶液使之静置分层;
d、30min后,用120ml的二氯甲烷分三次萃取该混合液;
e、再把得到的二氯甲烷有机层分别用50ml 1.0mol/L K2CO3溶液和60ml的去离子水各洗一次;
f、最后把分液后得到的有机溶液里的二氯甲烷在30℃旋转蒸干,得到白色固体;
g、接着,再把所得的白色固体溶于50ml的丙胺和50ml的甲醇组成的混合液中,常温搅拌48h;
h、然后在55℃下把未反应的丙胺旋转蒸干,得到橙黄色粗品;
i、最后用三氯甲烷重结晶三次后,在40℃的烘箱中烘干,得到白色固体产物。
实施例2:表面巯基化的二氧化硅的制备
本发明的载体为表面巯基化的二氧化硅,其制备方法包括以下步骤:
a、取4.0g二氧化硅微球,超声分散于5ml的去离子水中,加入120ml甲醇,超声分散30min;
b、向本实施例步骤a处理得到反应液中加入120ml的甘油,再超声10min,将混合液转入500ml的三口烧瓶中,通20min氮气,得到混合溶液一;
c、取4ml的(3-巯丙基)-三乙氧基硅烷与40ml甲醇混合均匀,并倒入混合溶液一中,开始搅拌反应,得到混合溶液二;
d、在混合溶液二中加入10ml的氨水,于85℃、氮气保护下反应1h后,停止氮气保护后再反应5h;
e、待反应完毕,离心收集巯基功能化的二氧化硅微球后,用无水乙醇和去离子水分别洗涤3次;将清洗后的二氧化硅微球置于40℃、真空环境下进行干燥;即完成二氧化硅微球表面巯基化。
实施例3:α-鹅膏毒肽表面分子印迹材料(α-amanitin-MIP)的制备
本发明的α-鹅膏毒肽表面分子印迹材料的制备方法如下:
S1:将实施例1制得的模板分子与3-巯基丙酸、乙二醇二甲基丙烯酸酯、季戊四醇四-3-巯基丙酸酯加入到二甲基亚砜的溶液中搅拌均匀;模板分子、3-巯基丙酸与乙二醇二甲基丙烯酸酯的摩尔比为0.2:1:2;所述辅助交联剂季戊四醇四-3-巯基丙酸酯与交联剂乙二醇二甲基丙烯酸酯的摩尔比为9:4;
S2:将实施例2处理得到的巯基化二氧化硅微球加入本实施例S1步骤制得的混合溶液中,用三乙胺调节反应液pH约为8,在40℃下聚合反应6小时;
S3:将S2处理得到的二氧化硅微球从混合溶液中取出,依次用甲醇-乙酸(9:1,v/v)混合溶液和甲醇作洗脱剂进行冲洗;
S4:将冲洗后的二氧化硅微球置于40℃的真空环境下进行干燥处理,制得α-amanitin-MIP分子印迹材料。
实施例4:α-鹅膏毒肽表面分子印迹材料(α-amanitin-MIP)的制备
本发明的α-鹅膏毒肽表面分子印迹材料的制备方法如下:
S1:将实施例1制得的模板分子与3-巯基丙酸、乙二醇二甲基丙烯酸酯、季戊四醇四-3-巯基丙酸酯加入到二甲基亚砜的溶液中搅拌均匀;模板分子、3-巯基丙酸与乙二醇二甲基丙烯酸酯的摩尔比为0.15:1:2;所述辅助交联剂季戊四醇四-3-巯基丙酸酯与交联剂乙二醇二甲基丙烯酸酯的摩尔比为9:4;
S2:将实施例2处理得到的巯基化二氧化硅微球加入本实施例S1步骤制得的混合溶液中,用三乙胺调节反应液pH约为8,在40℃下聚合反应9小时;
S3:将S2处理得到的二氧化硅微球从混合溶液中取出,依次用甲醇-乙酸(9:1,v/v)混合溶液和甲醇作洗脱剂进行冲洗;
S4:将冲洗后的二氧化硅微球置于45℃的真空环境下进行干燥处理,制得α-amanitin-MIP分子印迹材料。
实施例5:α-鹅膏毒肽表面分子印迹材料(α-amanitin-MIP)的制备
本发明的α-鹅膏毒肽表面分子印迹材料的制备方法如下:
S1:将实施例1制得的模板分子与3-巯基丙酸、乙二醇二甲基丙烯酸酯、季戊四醇四-3-巯基丙酸酯加入到二甲基亚砜的溶液中搅拌均匀;模板分子、3-巯基丙酸与乙二醇二甲基丙烯酸酯的摩尔比为0.25:1:2;所述辅助交联剂季戊四醇四-3-巯基丙酸酯与交联剂乙二醇二甲基丙烯酸酯的摩尔比为9:4;
S2:将实施例2处理得到的巯基化二氧化硅微球加入本实施例S1步骤制得的混合溶液中,用三乙胺调节反应液pH约为8,在40℃下聚合反应12小时;
S3:将S2处理得到的二氧化硅微球从混合溶液中取出,依次用甲醇-乙酸(9:1,v/v)混合溶液和甲醇作洗脱剂进行冲洗;
S4:将冲洗后的二氧化硅微球置于50℃的真空环境下进行干燥处理,制得α-amanitin-MIP分子印迹材料。
本发明并不局限于上述实施方式,如果对本发明的各种改动或变形不脱离本发明的精神和范围,倘若这些改动和变形属于本发明的权利要求和等同技术范围之内,则本发明也意图包含这些改动和变形。
Claims (3)
1.一种α-鹅膏毒肽分子印迹材料制备方法,其特征在于包括以下步骤:
S1:将模板分子与功能单体、交联剂、辅助交联剂、溶剂混匀;所述模板分子为N-乙酰色氨酸丙酰胺,所述功能单体为3-巯基丙酸,所述交联剂为乙二醇二甲基丙烯酸酯,所述辅助交联剂为季戊四醇四-3-巯基丙酸酯,所述溶剂为二甲基亚砜;模板分子、功能单体、交联剂的摩尔比例为0.15~0.25:1:2,辅助交联剂与交联剂的摩尔比例为9:4;
S2:将载体表面进行巯基化处理;所述载体为二氧化硅微球;
S3:将S2处理得到的载体加入S1制得的混合溶液中,通过功能单体与模板分子交联聚合;
S4:用洗脱液将模板分子从聚合后的载体表面洗脱,得到分子印迹材料;所述洗脱液分为第一洗脱液和第二洗脱液,第一洗脱液为甲醇与乙酸的体积比为9:1的混合溶液,第二洗脱液为甲醇;
S5:将S4处理得到分子印迹材料在温度40~50℃下真空干燥;
其中,S3步骤中的聚合条件为:用三乙胺将聚合反应液pH调至7~9,40℃~50℃下反应6~12h。
2.根据权利要求1所述的α-鹅膏毒肽分子印迹材料制备方法,其特征在于:所述S1中模板分子、功能单体、交联剂的摩尔比例为0.2:1:2。
3.根据权利要求1所述的α-鹅膏毒肽分子印迹材料制备方法,其特征在于所述S2中的巯基化处理方法包括如下步骤:
S2a:取载体,溶于水中,加甲醇超声使其分散;
S2b:向S2a得到的反应液中加入甘油,再超声,超声后通入氮气;
S2c:取(3-巯丙基)-三乙氧基硅烷与甲醇混合均匀,加入S2b得到的反应液中,搅拌使其混合均匀;
S2d:向S2c得到的反应液中加入氨水,85℃氮气保护下反应1h后,停止氮气,再反应5h;
S2e:反应结束后离心收集载体,用无水乙醇和去离子水分别洗涤,40℃下真空干燥即得。
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