CN114606202A - 一种猪圆环病毒2型悬浮培养用培养基及其应用 - Google Patents
一种猪圆环病毒2型悬浮培养用培养基及其应用 Download PDFInfo
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- CN114606202A CN114606202A CN202210327195.5A CN202210327195A CN114606202A CN 114606202 A CN114606202 A CN 114606202A CN 202210327195 A CN202210327195 A CN 202210327195A CN 114606202 A CN114606202 A CN 114606202A
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Abstract
本发明涉及病毒繁殖技术领域,尤其涉及一种猪圆环病毒2型悬浮培养用培养基及其应用,本发明的一种猪圆环病毒2型悬浮培养用培养基,包括以下重量份原料:DMEM培养基85‑95份、片状载体2‑5份、微量元素10‑20份、维生素0.5‑2份、氨基酸1‑3份,所述片状载体是以改性载体纤维经过压合、剪切制成,所述改性载体纤维为葛根纤维经过聚乙二醇改性而得。本发明制备得到的一种猪圆环病毒2型悬浮培养用培养基,不仅能够为细胞繁殖培养提供营养物质,同时能够调整培养基贴壁因子,使得细胞适应悬浮培养,培养出免疫原性良好的圆环病毒。
Description
技术领域
本发明涉及病毒繁殖技术领域,尤其涉及一种猪圆环病毒2型悬浮培养用培养基及其应用。
背景技术
猪圆环病毒2型(PCV2)属于圆环病毒科,感染PCV2后导致母猪繁殖障碍、猪增生性和坏死性肺炎、猪皮炎、肾病综合征(PDNS)、断奶仔猪多***衰竭综合征(PMWS)以及猪的先天性震颤等疾病。该病毒在全国各地区广泛流行,给世界养猪业带来了巨大的影响和严重的经济损失,现在对于猪圆环病毒2型主要以疫苗预防为主。目前疫苗生产中,常用PK-15细胞增殖PCV2,但由于PCV2体外增殖能力弱,致使PCV2抗原含量较低,因此,PCV2的抗原含量高低已成为制约现有疫苗质量的关键瓶颈之一。
大规模细胞培养核心技术是提升单位体积内PK-15细胞的数量,其中微载体悬浮培养、片状载体悬浮培养、全悬浮培养是当前较为成熟的一项大规模细胞培养技术,在国内外已成功应用于兽用疫苗抗原制备,这三种培养技术具有自动化控制程度高、不易污染、易于大规模生产、抗原产量和含量高等优点,其中,片状载体悬浮培养在单位体积内细胞的数量要大于微载体悬浮培养。而现有的片状载体,大多采用聚丙烯或聚酯无纺布制成,病毒附着率有待提升。
发明内容
有鉴于此,本发明的目的是提供一种猪圆环病毒2型悬浮培养用培养基及其应用,不仅能够为细胞繁殖培养提供营养物质,同时能够调整培养基贴壁因子,使得细胞适应悬浮培养,培养出免疫原性良好的圆环病毒。
本发明通过以下技术手段解决上述技术问题:
一种猪圆环病毒2型悬浮培养用培养基,包括以下重量份原料:DMEM培养基85-95份、片状载体2-5份、微量元素10-20份、维生素0.5-2份、氨基酸1-3份,所述片状载体是以改性载体纤维经过压合、剪切制成,所述改性载体纤维为葛根纤维经过聚乙二醇改性而得。
本发明的悬浮培养基,改性载体纤维为原料制备得到片状载体,其中,葛根中的多糖类物质能够促进细胞的活性,使得细胞适应悬浮培养,而加入的改性载体纤维,其不仅能够作为微生物的载体物质,为细胞的繁殖提供营养物质,同时通过在葛根纤维中引入聚乙二醇,从而使得葛根纤维具有两亲性,不仅能够使得其更好的分散在水中,减少团聚,葛根纤维中的物质还具有一定的成膜性和粘附性,能够调整贴壁因子,也有利于细胞在片状载体表面的粘附,培养免疫原性良好的圆环病毒。
进一步,包括以下重量份原料:DMEM培养基90份、片状载体3份、微量元素12份、维生素1份、氨基酸2份。
进一步,所述微量元素包括:250-300mg/L氯化钾、1500-2000mg/L碳酸氢钠、0.03-0.2mg/L硫酸铜、50-60mg/L硫酸镁、1-1.5mg/L氯化铁。
进一步,所述维生素包括:2-4mg/L叶酸、6-10mg/L烟酰胺、10-15mg/L维生素C、50-65mg/L氯化胆碱。
进一步,所述氨基酸包括:200-220mg/L谷氨酸、300-350mg/L脯氨酸、160-180mg/L胱氨酸、300-320mg/L络氨酸、400-460mg/L丝氨酸、800-900mg/L天冬氨酸。
进一步,所述片状载体的制备方法为:取制备得到的改性载体纤维,加入乙醇溶液中,再加入硅烷偶联剂,搅拌混合均匀,加入十二烷基磺酸钠,持续搅拌,升温至70-80℃,保温反应10-12h,反应完成后,冷却至室温,压滤,得到滤饼于40-45℃温度下烘干,剪切、破碎得到片状载体。
进一步,所述改性载体纤维的制备方法包括以下步骤:
所述改性载体纤维的制备方法包括以下步骤:
S1:取葛渣,清洗去除杂质后加入复合酶,于50-60℃温度下进行酶解处理1-1.5h,反应完成后过滤,滤饼抖散、烘干得到葛根粗纤维;
S2:将制备得到的葛根粗纤维搅拌分散于硝酸钙溶液中,得到混悬液,将混悬液于70-75MPa压力下进行高压匀质3次,旋转蒸干得到反应产物置于管式炉中,在氮气气氛下,升温至600-650℃温度下煅1-2h,煅烧完成后随炉冷却,取出喷洒加入去离子水,静置20min,浸泡于去离子水中,超声振荡洗涤,过滤、烘干得到葛根纤维;
S3:分别称取巯基乙酸和聚乙二醇加入甲苯中,搅拌混匀后加入对甲苯磺酸,然后在氮气气氛下搅拌升温至100-120℃,保温反应12-14h,得到反应产物用***沉淀,过滤,滤饼烘干后加入N,N-二甲基甲酰胺中,搅拌溶解后,加入2,4-二异氰酸酯,然后加入葛根纤维,在氮气气氛下,升温至70-80℃,保温反应150-180min,反应完成后趁热过滤,滤饼用无水乙醇浸泡洗涤,再用去离子水透析3d,干燥得到改性载体纤维。
本发明的改性载体纤维,利用葛渣为原料,在复合酶的作用下,对葛根纤维的木质素、纤维素等进行分解,使得葛根纤维进行帚化疏解,提高葛根纤维的蓬松度和柔软度,然后再将其置于硝酸钙溶液中,吸附负载硝酸钙后通过煅烧,一方面实现对葛根纤维的部分碳化,使得葛根纤维表面变得粗糙有利于微生物的负载,另一方面硝酸钙经过煅烧形成氧化钙,在煅烧完成后喷洒的去离子水和纤维上的氧化钙反应,产生碱性的请氧化钙并产热,对葛根纤维进行活化,有利于后续的聚乙二醇的改性。
进一步,所述S1步骤的复合酶为α-淀粉酶和纤维素酶的复合物,所述α-淀粉酶和纤维素酶的质量比为1:(2-5)。
此外,本发明还公开了上述的一种猪圆环病毒2型悬浮培养用培养基的应用,将培养基应用于猪圆环病毒2型的培养中。
本发明的有益效果:
本发明的一种猪圆环病毒2型悬浮培养用培养基,通过对原料成分的调整,能够促进细胞活性,同时以改性葛根纤维为原料,制备得到片状载体,不仅能够为细胞繁殖培养提供营养物质,同时能够调整培养基贴壁因子,提高细胞在片状载体上的负载性,有利于提高细胞浓度,培养免疫原性良好的圆环病毒。
具体实施方式
以下将结合具体实施例对本发明进行详细说明:
实施例一
改性载体纤维的制备
S1:取200g提取完葛根提取物后的葛渣,清洗去除杂质后,加入4L水,再加入6g复合酶,其中复合酶包括2gα-淀粉酶和4g纤维素酶,于60℃温度下进行酶解处理1h,反应完成后过滤,滤饼抖散、烘干得到葛根粗纤维;
S2:将20g制备得到的葛根粗纤维搅拌分散于100ml、18wt%硝酸钙溶液中,得到混悬液,将混悬液于75MPa压力下进行高压匀质3次,旋转蒸干得到反应产物置于管式炉中,在氮气气氛下,升温至620℃温度下煅1-2h,煅烧完成后随炉冷却,取出喷洒加入5g去离子水,静置20min,浸泡于去离子水中,超声振荡洗涤,过滤、烘干得到葛根纤维;
S3:分别称取0.5g巯基乙酸和3g聚乙二醇加入200mL甲苯中,搅拌混匀后加入9mg对甲苯磺酸,然后在氮气气氛下搅拌升温至100℃,保温反应12h,得到反应产物用***沉淀,过滤,滤饼烘干后加入300mL N,N-二甲基甲酰胺中,搅拌溶解后,加入0.5g 2,4-二异氰酸酯,然后加入10g葛根纤维,在氮气气氛下,升温至75℃,保温反应180min,反应完成后趁热过滤,滤饼用无水乙醇浸泡洗涤,再用去离子水透析3d,干燥得到改性载体纤维。
片状载体的制备:取5g制备得到的改性载体纤维,加入100mL、60wt%乙醇溶液中,再加入0.3g乙烯基三乙氧基硅烷,搅拌混合均匀,加入1g十二烷基磺酸钠,持续搅拌,升温至70℃,保温反应11h,反应完成后,冷却至室温,压滤,得到滤饼于45℃温度下烘干,剪切、破碎得到片状载体,经检测制备得到片状载体的平均厚度位0.42mm,孔径为12μm,可供细胞生长的比表面积约为1600cm2/g。
本实施例的培养基包括以下重量份原料:DMEM培养基90份、片状载体3份、微量元素12份、维生素1份、氨基酸2份。
微量元素包括:250mg/L氯化钾、1600mg/L碳酸氢钠、0.03mg/L硫酸铜、55mg/L硫酸镁、1.5mg/L氯化铁。
维生素包括:4mg/L叶酸、8mg/L烟酰胺、15mg/L维生素C、50mg/L氯化胆碱。
氨基酸包括:220mg/L谷氨酸、320mg/L脯氨酸、160mg/L胱氨酸、310mg/L络氨酸、460mg/L丝氨酸、850mg/L天冬氨酸。
实施例二
改性载体纤维的制备
S1:取200g提取完葛根提取物后的葛渣,清洗去除杂质后,加入5L水,再加入6g复合酶,其中复合酶包括1gα-淀粉酶和5g纤维素酶,于60℃温度下进行酶解处理1h,反应完成后过滤,滤饼抖散、烘干得到葛根粗纤维;
S2:将20g制备得到的葛根粗纤维搅拌分散于100ml、20wt%硝酸钙溶液中,得到混悬液,将混悬液于70MPa压力下进行高压匀质3次,旋转蒸干得到反应产物置于管式炉中,在氮气气氛下,升温至600℃温度下煅1-2h,煅烧完成后随炉冷却,取出喷洒加入5g去离子水,静置20min,浸泡于去离子水中,超声振荡洗涤,过滤、烘干得到葛根纤维;
S3:分别称取0.6g巯基乙酸和3g聚乙二醇加入200mL甲苯中,搅拌混匀后加入9mg对甲苯磺酸,然后在氮气气氛下搅拌升温至110℃,保温反应13h,得到反应产物用***沉淀,过滤,滤饼烘干后加入300mL N,N-二甲基甲酰胺中,搅拌溶解后,加入0.3g 2,4-二异氰酸酯,然后加入10g葛根纤维,在氮气气氛下,升温至70℃,保温反应150min,反应完成后趁热过滤,滤饼用无水乙醇浸泡洗涤,再用去离子水透析3d,干燥得到改性载体纤维。
片状载体的制备:取5g制备得到的改性载体纤维,加入100mL、65wt%乙醇溶液中,再加入0.3g乙烯基三乙氧基硅烷,搅拌混合均匀,加入1.2g十二烷基磺酸钠,持续搅拌,升温至75℃,保温反应12h,反应完成后,冷却至室温,压滤,得到滤饼于40℃温度下烘干,剪切、破碎得到片状载体经检测制备得到片状载体的平均厚度位0.41mm,孔径为15μm,可供细胞生长的比表面积约为1650cm2/g。
本实施例的培养基包括以下重量份原料:DMEM培养基85份、片状载体5份、微量元素10份、维生素0.5份、氨基酸3份。
微量元素包括:300mg/L氯化钾、1500mg/L碳酸氢钠、0.1mg/L硫酸铜、60mg/L硫酸镁、1.2mg/L氯化铁。
维生素包括:3mg/L叶酸、10mg/L烟酰胺、12mg/L维生素C、65mg/L氯化胆碱。
氨基酸包括:210mg/L谷氨酸、350mg/L脯氨酸、170mg/L胱氨酸、320mg/L络氨酸、430mg/L丝氨酸、900mg/L天冬氨酸。
实施例三
改性载体纤维的制备
S1:取200g提取完葛根提取物后的葛渣,清洗去除杂质后,加入6L水,再加入6g复合酶,其中复合酶包括1.2gα-淀粉酶和4.8g纤维素酶,于55℃温度下进行酶解处理1.5h,反应完成后过滤,滤饼抖散、烘干得到葛根粗纤维;
S2:将20g制备得到的葛根粗纤维搅拌分散于100ml、15wt%硝酸钙溶液中,得到混悬液,将混悬液于75MPa压力下进行高压匀质3次,旋转蒸干得到反应产物置于管式炉中,在氮气气氛下,升温至650℃温度下煅1-2h,煅烧完成后随炉冷却,取出喷洒加入5g去离子水,静置20min,浸泡于去离子水中,超声振荡洗涤,过滤、烘干得到葛根纤维;
S3:分别称取0.6g巯基乙酸和4g聚乙二醇加入200mL甲苯中,搅拌混匀后加入8mg对甲苯磺酸,然后在氮气气氛下搅拌升温至120℃,保温反应14h,得到反应产物用***沉淀,过滤,滤饼烘干后加入300mL N,N-二甲基甲酰胺中,搅拌溶解后,加入0.4g 2,4-二异氰酸酯,然后加入10g葛根纤维,在氮气气氛下,升温至80℃,保温反应160min,反应完成后趁热过滤,滤饼用无水乙醇浸泡洗涤,再用去离子水透析3d,干燥得到改性载体纤维。
片状载体的制备:取5g制备得到的改性载体纤维,加入100mL、60wt%乙醇溶液中,再加入0.3g乙烯基三甲氧基硅烷,搅拌混合均匀,加入0.8g十二烷基磺酸钠,持续搅拌,升温至80℃,保温反应10h,反应完成后,冷却至室温,压滤,得到滤饼于45℃温度下烘干,剪切、破碎得到片状载体经检测制备得到片状载体的平均厚度位0.44mm,孔径为13μm,可供细胞生长的比表面积约为1500cm2/g。
本实施例的培养基包括以下重量份原料:DMEM培养基95份、片状载体2份、微量元素20份、维生素2份、氨基酸1份。
微量元素包括:280mg/L氯化钾、2000mg/L碳酸氢钠、0.2mg/L硫酸铜、50mg/L硫酸镁、1mg/L氯化铁。
维生素包括:2mg/L叶酸、6mg/L烟酰胺、10mg/L维生素C、55mg/L氯化胆碱。
氨基酸包括:200mg/L谷氨酸、300mg/L脯氨酸、180mg/L胱氨酸、300mg/L络氨酸、400mg/L丝氨酸、800mg/L天冬氨酸。
对比例一
本对比例和实施例一相比,其不同之处在于,本对比例的改性载体纤维在制备的时候不经过S2步骤处理,即改性载体纤维的制备具体为:
S1:取200g提取完葛根提取物后的葛渣,清洗去除杂质后,加入4L水,再加入6g复合酶,其中复合酶包括2gα-淀粉酶和4g纤维素酶,于60℃温度下进行酶解处理1h,反应完成后过滤,滤饼抖散、烘干得到葛根粗纤维;
S3:分别称取0.5g巯基乙酸和3g聚乙二醇加入200mL甲苯中,搅拌混匀后加入9mg对甲苯磺酸,然后在氮气气氛下搅拌升温至100℃,保温反应12h,得到反应产物用***沉淀,过滤,滤饼烘干后加入300mL N,N-二甲基甲酰胺中,搅拌溶解后,加入0.5g 2,4-二异氰酸酯,然后加入10g葛根纤维,在氮气气氛下,升温至75℃,保温反应180min,反应完成后趁热过滤,滤饼用无水乙醇浸泡洗涤,再用去离子水透析3d,干燥得到改性载体纤维。
片状载体的制备、培养基的配方与实施例一相同,经检测制备得到片状载体的平均厚度位0.44mm,孔径为18μm,可供细胞生长的比表面积约为1300cm2/g。
对比例二
本对比例和实施例一相比,其不同之处在于,本对比例的改性载体纤维不经过聚乙二醇改性处理,即改性载体纤维的具体制备为:
S1:取200g提取完葛根提取物后的葛渣,清洗去除杂质后,加入4L水,再加入6g复合酶,其中复合酶包括2gα-淀粉酶和4g纤维素酶,于60℃温度下进行酶解处理1h,反应完成后过滤,滤饼抖散、烘干得到葛根粗纤维;
S2:将20g制备得到的葛根粗纤维搅拌分散于100ml、18wt%硝酸钙溶液中,得到混悬液,将混悬液于75MPa压力下进行高压匀质3次,旋转蒸干得到反应产物置于管式炉中,在氮气气氛下,升温至620℃温度下煅1-2h,煅烧完成后随炉冷却,取出喷洒加入5g去离子水,静置20min,浸泡于去离子水中,超声振荡洗涤,过滤、烘干得到改性载体纤维。
片状载体的制备、培养基的配方与实施例一相同,经检测制备得到片状载体的平均厚度位0.41mm,孔径为13μm,可供细胞生长的比表面积约为1500cm2/g。
利用实施例一~实施例三,对比例一、对比例二制备得到的培养基进行猪圆环病毒2型的培养,同时以现有的含有5%胎牛血清的DMEM培养基作为对照,培养采用现有的方法进行,培养完成收获病毒后按照“猪圆环病毒2型灭活疫苗(DBNSX0 7株)制造及检验试行规程”进行病毒滴度的测定,每个组别进行3次重复试验,测试结果如表1所示:
表1
实施例一 | 实施例二 | 实施例三 | 对比例一 | 对比例二 | 对照组 | |
TCID<sub>50</sub>/mL | 10<sup>6.2</sup> | 10<sup>6.1</sup> | 10<sup>6.3</sup> | 10<sup>5.6</sup> | 10<sup>5.7</sup> | 10<sup>5.5</sup> |
通过表1数据可以看出,采用本申请的培养基进行猪圆环病毒2型的培养,病毒滴度显著提高,而通过实施例一和对比例一、对比例二的数据可以看出,当改性载体纤维不进行S2步骤处理时会导致得到的片状载体可供细胞生长的比表面积降低,而不进行S3步骤聚乙二醇改性则会降低载体对细胞的聚集,均会对细胞的繁殖产生影响。
以上实施例仅用以说明本发明的技术方案而非限制,尽管参照较佳实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的宗旨和范围,其均应涵盖在本发明的权利要求范围当中。本发明未详细描述的技术、形状、构造部分均为公知技术。
Claims (9)
1.一种猪圆环病毒2型悬浮培养用培养基,其特征在于,包括以下重量份原料:DMEM培养基85-95份、片状载体2-5份、微量元素10-20份、维生素0.5-2份、氨基酸1-3份,所述片状载体是以改性载体纤维经过压合、剪切制成,所述改性载体纤维为葛根纤维经过聚乙二醇改性而得。
2.根据权利要求1所述的一种猪圆环病毒2型悬浮培养用培养基,其特征在于,包括以下重量份原料:DMEM培养基90份、片状载体3份、微量元素12份、维生素1份、氨基酸2份。
3.根据权利要求2所述的一种猪圆环病毒2型悬浮培养用培养基,其特征在于,所述微量元素包括:250-300mg/L氯化钾、1500-2000mg/L碳酸氢钠、0.03-0.2mg/L硫酸铜、50-60mg/L硫酸镁、1-1.5mg/L氯化铁。
4.根据权利要求3所述的一种猪圆环病毒2型悬浮培养用培养基,其特征在于,所述维生素包括:2-4mg/L叶酸、6-10mg/L烟酰胺、10-15mg/L维生素C、50-65mg/L氯化胆碱。
5.根据权利要求4所述的一种猪圆环病毒2型悬浮培养用培养基,其特征在于,所述氨基酸包括:200-220mg/L谷氨酸、300-350mg/L脯氨酸、160-180mg/L胱氨酸、300-320mg/L络氨酸、400-460mg/L丝氨酸、800-900mg/L天冬氨酸。
6.根据权利要求1-5所述的一种猪圆环病毒2型悬浮培养用培养基,其特征在于,所述片状载体的制备方法为:取制备得到的改性载体纤维,加入乙醇溶液中,再加入硅烷偶联剂,搅拌混合均匀,加入十二烷基磺酸钠,持续搅拌,升温至70-80℃,保温反应10-12h,反应完成后,冷却至室温,压滤,得到滤饼于40-45℃温度下烘干,剪切、破碎得到片状载体。
7.根据权利要求6所述的一种猪圆环病毒2型悬浮培养用培养基,其特征在于,所述改性载体纤维的制备方法包括以下步骤:
S1:取葛渣,清洗去除杂质后加入复合酶,于50-60℃温度下进行酶解处理1-1.5h,反应完成后过滤,滤饼抖散、烘干得到葛根粗纤维;
S2:将制备得到的葛根粗纤维搅拌分散于硝酸钙溶液中,,得到混悬液,将混悬液于70-75MPa压力下进行高压匀质3次,旋转蒸干得到反应产物置于管式炉中,在氮气气氛下,升温至600-650℃温度下煅1-2h,煅烧完成后随炉冷却,取出喷洒加入去离子水,静置20min,浸泡于去离子水中,超声振荡洗涤,过滤、烘干得到葛根纤维;
S3:分别称取巯基乙酸和聚乙二醇加入甲苯中,搅拌混匀后加入对甲苯磺酸,然后在氮气气氛下搅拌升温至100-120℃,保温反应12-14h,得到反应产物用***沉淀,过滤,滤饼烘干后加入N,N-二甲基甲酰胺中,搅拌溶解后,加入2,4-二异氰酸酯,然后加入葛根纤维,在氮气气氛下,升温至70-80℃,保温反应150-180min,反应完成后趁热过滤,滤饼用无水乙醇浸泡洗涤,再用去离子水透析3d,干燥得到改性载体纤维。
8.根据权利要求7所述的一种猪圆环病毒2型悬浮培养用培养基的制备方法,其特征在于,所述S1步骤的复合酶为α-淀粉酶和纤维素酶的复合物,所述α-淀粉酶和纤维素酶的质量比为1:(2-5)。
9.根据权利要求7-8任一权利要求所述的一种猪圆环病毒2型悬浮培养用培养基的应用,其特征在于,将培养基应用于猪圆环病毒2型的培养中。
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