CN115287203B - 一种高效降解氨基甲酸乙酯的红酵母及其应用 - Google Patents
一种高效降解氨基甲酸乙酯的红酵母及其应用 Download PDFInfo
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- CN115287203B CN115287203B CN202210985886.4A CN202210985886A CN115287203B CN 115287203 B CN115287203 B CN 115287203B CN 202210985886 A CN202210985886 A CN 202210985886A CN 115287203 B CN115287203 B CN 115287203B
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Abstract
本发明公开了一种高效降解氨基甲酸乙酯的红酵母及其应用,属于食品生物技术领域。本发明提供一种高效降解氨基甲酸乙酯(EC)的红酵母DL‑XSY01,保藏编号:CGMCC No.23534。所述红酵母DL‑XSY01经筛选、鉴定、活化、发酵和包埋过程,获得EC降解制剂。本发明所获得的菌株DL‑XSY01经包埋后制成降解剂,可以用于发酵食品中EC的去除;本发明进一步使用菌株DL‑XSY01的降解剂去除不同食品体系中的EC,具有去除EC效果明显,生产成本低,使用方便、已于从食品体系中移除等特点,广泛适用于酒类饮料、发酵乳制品、酱油、醋等发酵食品中。
Description
技术领域
本发明涉及一种高效降解氨基甲酸乙酯的红酵母及其应用,属于食品生物技术领域。
背景技术
氨基甲酸乙酯(Ethyl carbamate,EC)是一种具有遗传毒性和较强致癌性的代谢产物,广泛存在于酒精饮料和发酵食品(如腐乳、酱油、乳酪、食醋、泡菜等)中。
近年来,世界各国学者先后在蒸馏酒、黄酒和葡萄酒中发现EC的存在,其中蒸馏酒和黄酒中的EC含量较高,葡萄酒中的EC含量低。EC具有抑菌和抗肿瘤活性,在20世纪40年代初期,EC被作为麻醉药物使用;1943年,有学者发现,EC具有致癌性,但是并未引起足够重视;在1974年,国际癌症研究机构将EC列为2B类致癌物质,并于2007年被升级为2A类致癌物。同时,EC被证明具有多位点致癌性,可以导致肺癌、淋巴癌、肝癌和皮肤癌等。在动物模型的实验中,转录因子STAT3、NF-kB和细胞外信号蛋白激酶ERK被证明参与EC诱导的肿瘤的发展。另一方面,EC也被证明可以通过诱导氧化应激反应、降低解毒能力、消耗能量、破坏膜结构完整性、破坏DNA和蛋白质等方式,诱导人体肝癌细胞HepG2死亡。目前,根据FAO/WHO食品添加剂联合委员会的数据,人体通过酿造酒摄入EC的平均含量为65ng·kg-1·d-1,远高于其他发酵食品五倍之多。
EC主要以尿素、瓜氨酸、氨甲酰磷酸等为前体,与乙醇反应产生。EC的控制方法主要包括限制前体和消减EC两大类。限制前体多使用脲酶消解尿素,但是脲酶特异性单一,需考虑前体类型及不同体系适用性,实用性受到限制,而消减EC适用范围广,较为常用,此方法一般通过EC水解酶以及产酶微生物作用,实现将EC水解为乙醇、氨和二氧化碳的过程。
但是,目前现有的EC降解菌株资源库还不能满足食品中EC生物降解的实际需求,分离并公开报道的EC降解菌株较少,而且已报道的大部分EC降解菌株为非食品来源甚至是条件性致病菌株,在一定程度上限制了菌株直接在发酵食品中EC去除的应用。
1991年,Kobashi等(Chem Pharm Bull,1991,39(12):3303-3306)从小鼠胃肠道中筛选到一株地衣芽孢杆菌Bacillus licheniformis sp.,但由于其EC水解酶对EC的亲和力较弱而无法投入实际应用;1994年Kobashi等(Biol Pharm Bull,1994,17(6):773-778)又分离到一株B.licheniformis sp,只表征了其EC降解酶酶学特征,但至今并无该菌株实际应用报道。1997年,Mohapatra(Lett Appl Microbiol,1997,25(6):393-396.)从海洋生物海绵中分离到一株Micrococcus sp.,从中分离的酸性EC水解酶具有较高的乙醇耐受能力,但至今并无该菌株实际应用报道。2006年,Yukie等人(Appl Microbiol Biotechnol,.2006,70(4):422-429)从土壤样品中分离到一株Rhodococcus equi,解析了其EC水解酶的序列,但该酶对EC的特异性并不强。2014年,李京京等(食品与生物技术学报,2014,33(12):1239-1245.)从从小鼠胃中筛选出一株EC降解菌株Lysinibacillus fusiformis,从其纯化的EC水解酶具有消除酱油中EC的潜力。2014年,卜攀攀等(生物工程学报,2014,30(3):404-411)从小鼠胃部获得了一株EC降解菌株肺炎克雷伯氏菌Klebsiella pneumonia,从其分离到了耐盐的EC水解酶,但由于该酶不能耐受酸胁迫,在环境pH小于6时,酶活显著下降,应用受到局限。2017年,刘等从Providencia rettgeri JN-B815中获得氨基甲酸乙酯水解酶,pH4-7范围内残余酶活达80%,乙醇浓度为35%时残余酶活达40%。此酶可在一定程度下耐受乙醇和酸性环境,但目前没有报道其实际应用能力。田亚平(Appl Biochem Biotechnol,2013:1-11)等从小鼠胃肠道中筛选分离得到一株EC降解菌株变幻青霉菌Penicilliumvariabile,从中分离EC水解酶,发现该酶能够有效的降解白酒中的EC。
而从白酒酿造过程分离获得的菌株,报道的有:徐岩等(J Agric Food Chem,2018,66(6):1583-1590.)从白酒发酵过程中分离到的Lysinibacillus sphaericus MT3,吴群(Appl Biochem Biotechnol,2013:1-13.)等从中国白酒酿造过程中分离得到胶红酵母菌株。发酵食品来源的EC降解菌株资源库亟待扩充。
因此,本发明对发酵食品中可降解EC的微生物进行筛选、分离、鉴定和应用表征,可以扩充发酵食品来源的EC降解菌株资源库,为降低发酵食品中EC提供有效手段,为保障发酵食品安全提供技术支持。
发明内容
针对现有降解菌株较少且多数非食品来源、EC降解菌剂对EC降解效果不佳的问题,本发明目的在于提供一株分离自发酵食品的酵母菌株DL-XSY01,以及用该菌株制备的降解剂。
所述圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01,已保藏于中国微生物菌种保藏管理委员会普通微生物中心,保藏编号为CGMCC No.23534,保藏日期为2021年10月08日。
所述圆红冬孢酵母DL-XSY01分离采集自山东小米醋醋厂的醋醅中,将测序结果进行Blastn分析,发现该菌与Rhodosporidium toruloides和Rhodotorula mucilaginosa的同源性最高,均达到99%。经形态学和26s rRNA鉴定,该菌株DL-XSY01为Rhodosporidiumtoruloides,命名为圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01。
所述圆红冬孢酵母DL-XSY01在YPD固体平板中生长良好,28℃培养48h,形成湿润、圆形、突起、光滑、浅粉色菌落;镜检发现菌体呈椭圆型长棒状,在4℃静置2d后呈现橘红色。最适生长温度28℃,最适pH5~6。
本发明提供了一株圆红冬孢酵母DL-XSY01或其发酵液在制备可降解氨基甲酸乙酯的产品中的应用。
在本发明的一种实施方式中,所述产品为化学品或微生物菌剂。
在本发明的一种实施方式中,所述微生物菌剂的制备方法为:
(1)将上述圆红冬孢酵母DL-XSY01接种于YPD液体培养基中进行活化,在25~32℃、150~250rpm恒温振荡培养24~48h,获得种子液;
(2)将所述种子液按10%-20%接种量接种于发酵培养基中,在25~32℃、通气量0.6~1.0m3/min,搅拌速率150~250rpm条件下,发酵至菌体数量3×108~1.8×109CFU/mL,得到圆红冬孢酵母DL-XSY01发酵产物;
(3)将步骤(2)制备得到的所述圆红冬孢酵母DL-XSY01发酵产物进行包埋,制成微生物菌剂。
在本发明的一种实施方式中,所述圆红冬孢酵母DL-XSY01在产品中的添加量至少为:3×108CFU/mL。
在本发明的一种实施方式中,所述化学品包括但不限于氨基甲酸乙酯降解剂、氨基甲酸乙酯吸附剂、氨基甲酸乙酯抑制剂、氨基甲酸乙酯分解剂,氨基甲酸乙酯降解生物菌种、氨基甲酸乙酯降解微生物菌剂。
本发明还提供了一种降解食品中氨基甲酸乙酯的方法,在食品的制备过程中,添加所述圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01或其发酵液进行氨基甲酸乙酯的降解,降解后除菌,制备得到食品。
在本发明的一种实施方式中,所述食品包括但不限于发酵食品、酒精饮品。
在本发明的一种实施方式中,所述食品为白酒、黄酒、红酒、酸奶、醋、酱油。
本发明还提供了一种氨基甲酸乙酯降解剂,其特征在于,所述降解剂是按照下述方法制备得到的:
(1)将上述圆红冬孢酵母DL-XSY01接种于YPD液体培养基中进行活化,在25~32℃、150~250rpm恒温振荡培养24~48h,获得种子液;
(2)将所述种子液按10%-20%接种量接种于发酵培养基中,在25~32℃、通气量0.6~1.0m3/min,搅拌速率150~250rpm条件下,发酵至菌体数量3×108~1.8×109CFU/mL,得到圆红冬孢酵母DL-XSY01发酵产物;
(3)将步骤(2)制备得到的所述圆红冬孢酵母DL-XSY01发酵产物进行包埋,制成氨基甲酸乙酯降解剂。
在本发明的一种实施方式中,所述发酵培养基为:YPD液体培养基(蛋白胨20.0g,酵母粉10.0g,葡萄糖20.0g,蒸馏水补至1L,调pH至7.0,高压灭菌20min)。
在本发明的一种实施方式中,所述包埋的方法为:
S1.将海藻酸钠(4%)与含菌发酵液、细胞裂解液和菌体悬液以1:1的比例混合;
S2.用10mL注射器吸取并以2-10滴/秒的速度缓慢滴入固化液(0.6%CaCl2的饱和硼酸溶液)中,固化时间约5h;
S3.将固定化细胞用生理盐水冲洗3-4次,置于壳聚糖(2%)溶液中覆膜40min;
S4.再次用0.8%生理盐水冲洗3-4次,沥干水分,4℃下保存备用。
在本发明的一种实施方式中,所述小球湿润状态下粒径为3-5mm。
在本发明的一种实施方式中,步骤(2)中所述圆红冬孢酵母DL-XSY01发酵产物包括:圆红冬孢酵母DL-XSY01含菌发酵液、圆红冬孢酵母DL-XSY01发酵液上清、圆红冬孢酵母DL-XSY01菌体悬液、圆红冬孢酵母DL-XSY01细胞裂解液。
在本发明的一种实施方式中,所述圆红冬孢酵母DL-XSY01含菌发酵液由所述圆红冬孢酵母DL-XSY01发酵产物经干燥,用去离子水回调至原体积的1/20制成;
所述圆红冬孢酵母DL-XSY01菌体悬液由所述圆红冬孢酵母DL-XSY01发酵产物在4000g转速下离心10min并收集并收集菌体沉淀物,稀释至浓度20OD600得到;
所述圆红冬孢酵母DL-XSY01细胞裂解液由所述圆红冬孢酵母DL-XSY01菌体悬液经过细胞破壁得到。
在本发明的一种实施方式中,所述干燥方法包括冷冻真空干燥。
在本发明的一种实施方式中,步骤(3)中所述进行包埋后制备得到固定化小球,方法包括以下步骤:
S1.将海藻酸钠(4%)与含菌发酵液、细胞裂解液和菌体悬液以1:1的比例混合;
S2.用10mL注射器吸取并以2-10滴/秒的速度缓慢滴入固化液(0.6%CaCl2的饱和硼酸溶液)中,固化时间约5h;
S3.将固定化细胞用生理盐水冲洗3-4次,置于壳聚糖(2%)溶液中覆膜40min;
S4.再次用0.8%生理盐水冲洗3-4次,沥干水分,4℃下保存备用。
在本发明的一种实施方式中,所述小球湿润状态下粒径为3-5mm。
本发明还提供了上述圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01在氨基甲酸乙酯降解中的应用。
有益效果
(1)本发明从小米醋醋醅中筛选获得一株EC高效降解菌株DL-XSY01,该菌株可以利用EC作为唯一碳源生长,可有效降解EC,降解剂对EC的降解率最高可达76%,具有良好的EC生物降解效果。
(2)由于本发明所获的的菌株DL-XSY01分离自发酵食品,该菌株及其制成的EC降解剂可用于发酵食品中EC的去除,白酒中EC解率达到76%,本发明提供方法具有生产成本低、使用方便、易于从发酵产品体系中移除等特点,可以有效提高酒精饮料、酸奶、酱油和醋等发酵食品的品质和安全性。
(3)安全性评价表明:菌株DL-XSY01是安全的。抗生素敏感性中,菌株对抗生素头孢氨苄中度敏感,对10种抗生素头孢唑林、红霉素、庆大霉素、四环素、阿米卡星氨苄西林、链霉素、万古霉素、米诺环素和青霉素G敏感;溶血性实验中,DL-XSY01在羊血平板上28℃培养时未表现出溶血(γ-溶血)。然而,金黄色葡萄球菌ATCC 25923显示出β-溶血作用,阳性对照成立。此外大肠杆菌Nissle 1917显示α-溶血。因此,DL-XSY01被认为是对人体健康无危害的安全的生物体。
(4)益生性评价表明:菌株DL-XSY01在人工模拟胃液中和人工模拟肠液中有良好的存活率;对DPPH和ABTS自由基具有较好清除能力,清除率分别可达90.02%和93.67%。
生物材料保藏
一株圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01,分类命名为圆红冬孢酵母Rhodosporidium toruloides,已于2021年10月08日保藏于中国微生物菌种保藏管理委员会普通微生物中心,保藏编号为CGMCC No.23534,保藏地址为北京市朝阳区北辰西路1号院3号,中国科学院微生物研究所。
附图说明
图1为本发明圆红冬孢酵母DL-XSY01的显微照片。
图2为本发明圆红冬孢酵母DL-XSY01以EC为碳源时的筛选图片。
具体实施方式
下述实施例仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,本发明主要阐述菌株以及基于所述菌株的应用思想,实施方式中简单参数的替换不能一一在实施例中赘述,其它的任何改变未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,应被视为等效的置换方式,任何熟悉本技术领域的技术人员在本发明披露的技术范围内,都应涵盖在本发明的保护范围之内
以下结合说明书附图和具体实施例进一步说明本发明。除非特殊说明,本发明采用的试剂、方法和设备为本技术领域常规试剂、方法和设备;除非特别说明,以下实施例所用试剂和材料均为市购。
本发明中使用的各种培养基均采用常规方法配制,实施例中涉及的分子生物学操作如未注明具体试验条件和方法,均参照SambrookJ等主编,科学出版社,2002,分子克隆实验指南(第三版);或参照产品说明书。
下述实施例中所涉及的培养基的配制如下:
YPD液体培养基:蛋白胨20.0g,酵母粉10.0g,葡萄糖20.0g,蒸馏水补至1L,调pH至7.0,高压灭菌20min。
YPD固体培养基:蛋白胨20.0g,酵母粉10.0g,葡萄糖20.0g,15g琼脂,蒸馏水补至1L,调pH至7.0,高压灭菌20min,然后倒平板。
YNB液体培养基:硫酸铵5000mg,肌醇2mg,烟酸(维生素B3)0.4mg,盐酸硫胺素(维生素B1)0.4mg,硫酸铜0.04mg,磷酸二氢钾1000mg,硼酸0.5mg,盐酸吡哆醇(维生素B6)0.4mg,泛酸钙(维生素B5)0.4mg,对氨基苯甲酸0.2mg,硫酸镁500mg,硫酸锰0.4mg,硫酸锌0.4mg,氯化铁0.2mg,核黄素(维生素B2)0.2mg,氯化钙100mg,碘化钾0.1mg,钼酸钠0.2mg,生物素(维生素B7、H)0.002mg,叶酸(维生素B9)0.002mg,氯化钠100mg,蒸馏水补至1L,滤头除菌。
YNB固培养基:硫酸铵5000mg,肌醇2mg,烟酸(维生素B3)0.4mg,盐酸硫胺素(维生素B1)0.4mg,硫酸铜0.04mg,磷酸二氢钾1000mg,硼酸0.5mg,盐酸吡哆醇(维生素B6)0.4mg,泛酸钙(维生素B5)0.4mg,对氨基苯甲酸0.2mg,硫酸镁500mg,硫酸锰0.4mg,硫酸锌0.4mg,氯化铁0.2mg,核黄素(维生素B2)0.2mg,氯化钙100mg,碘化钾0.1mg,钼酸钠0.2mg,生物素(维生素B7、H)0.002mg,叶酸(维生素B9)0.002mg,氯化钠100mg,15g琼脂,蒸馏水补至1L,滤头除菌。
下述实施例中所涉及的EC含量测定方法如下:
采用国标方法GB5009.223-2014测定培养上清液中EC的残留量,同时设不接菌的YPD培养基作对照,每个处理3个重复。该方法的具体步骤:2mL样品上样于CleanertEC氨基甲酸乙酯专用柱上,静置10min,用10mL正己烷淋洗,真空泵抽干,用10mL 5%乙酸乙酯-乙醚溶液以1mL/min流速洗脱,收集洗脱液。接收的洗脱液在室温下氮吹至0.5mL,用甲醇定容至1mL,向其中加入0.8g无水硫酸钠(100℃,24h),10000rpm离心,上清使用0.22μm有机滤膜过滤,流出液供气质检测(约0.5mL),供GC/MS分析。
GC-MS分析条件如下:
毛细管色谱柱:DB-INNOWAX,30m×0.25mm(内径)×0.25μm(膜厚);进样口温度:220℃;柱温:初温50℃,保持1min,然后以8℃/min升至180℃,程序运行完成后,240℃后运行5min;载气:氦气,纯度≥99.999%,流量1.0mL/min;离子源:EI;电离能量:70eV;离子源温度:230℃;四级杆温度:150℃;传输线温度:250℃;溶剂延迟:11min;进样方式:不分流进样;进样量:1μL;检测方式:选择离子检测(SIM);EC选择检测离子(m/z):44、62、74、89,定量离子62。
根据峰面积和标准曲线即可计算氨基甲酸乙酯的浓度。
降解率计算公式:
实施例1:圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01的分离制备
1、菌株的分离和纯化:
(1)样品:采集自山东小米醋醋场的醋醅。
(2)分离筛选方法采用先进行抗氧化富集,再进行EC降解功能验证:
取醋醅1g,加入到10mL含有2mM过氧化氢的YPD液体培养基中,并将上述样品移入均质袋,拍打30min,无菌条件下,移取均质袋中的部分液体至50mL离心管中,在30℃,200rpm条件下培养48h。由于在强氧化环境中菌体的生长会受到抑制甚至不生长,而麦角硫因具有强抗氧化性,因此能够产生较高水平麦角硫因的菌株会在培养基中正常生长,而不能产生麦角硫因或产量较低的菌株则会被筛选压力淘汰。待培养基浑浊后,稀释涂布于YPD固体培养基上,液体吸收后置于30℃倒置培养48h,挑单菌落进行YPD固体培养基上平板划线,连续纯化三代,挑取单菌落进行镜检,确定未污染后,进行菌株冻存保藏,菌株命名为DL-XSY01。
S2(EC降解功能验证):菌株DL-XSY01加入含有5g/L EC的10mL YNB液体培养基,在30℃,200rpm条件下培养24h,500rpm离心5min,取酵母沉淀稀释后均匀涂布在含有10g/L的EC为唯一碳源的YNB固体平板上,在28℃倒置培养72h,菌落形成。发现菌株DL-XSY01能以EC为唯一碳源进行良好生长,说明菌株DL-XSY01具有EC降解功能。
如图1所示,为本发明圆红冬孢酵母DL-XSY01以EC为唯一碳源时的生长图片。
2、菌株DL-XSY01的鉴定:
(1)提取菌株DL-XSY01基因组进行26s rRNA PCR鉴定,基因组提取方法按照《精编分子生物学实验指南》玻璃珠法进行提取。
PCR条件突下:
扩增体系为:2×Taq Master Mix 25μL、引物D1 2μL、引物D2 2μL、灭菌水19μL、模板2μL。PCR反应条件为:95℃预变性3min;95℃变性15S;50℃退火15S;72℃延伸1min;72℃15min;30个循环;4℃无穷。
PCR结束后进行琼脂糖凝胶(1.0%)电泳检测酵母菌样品PCR产物,跑出条带且条带明亮的为PCR扩增成功的基因组,成功的基因组即可送测序。引物序列D1:GCATATCAATAAGCGGAGGAAAAG,D2:GGTCCGTGTTTCAAGACGG。
所述菌株DL-XSY01的26s rRNA序列如下:
TTTACGGCATTCCCTAGTAGCGGCGAGCGAAGCGGGAAGAGCTCAAATTTATAATCTGGCACCTTCGGTGTCCGAGTTGTAATCTCTAGAAATGTTTTCCGCGCTGGACCGCACACAAGTCTGTTGGAATACAGCGGCATAGTGGTGAGACCCCCGTATATGGTGCGGACGCCCAGCGCTTTGTGATACATTTTCGAAGAGTCGAGTTGTTTGGGAATGCAGCTCAAATTGGGTGGTAAATTCCATCTAAAGCTAAATATTGGCGAGAGACCGATAGCGAACAAGTACCGTGAGGGAAAGATGAAAAGCACTTTGGAAAGAGAGTTAACAGTACGTGAAATTGTTGGAAGGGAAACGCTTGAAGTCAGACTTGCTTGCCGAGCAATCGGTTTGCAGGCCAGCATCAGTTTTCCGGGATGGATAATGGTAGAGAGAAGGTAGCAGTTTCGGCTGTGTTATAGCTCTCTGCTGGATACATCTTGGGGGACTGAGGAACGCAGTGTGCCTTTGGCGGGGGTTTCGACCTCTTCACACTTAGGATGCTGGTGGAATGGCTTTAAACGACCCGTCTTGAAACACGGACCCAAA。
将上述测序结果进行Blastn分析,发现该菌与Rhodosporidium toruloides和Rhodotorula mucilaginosa的同源性最高,均达到99%。经形态学和26s rRNA鉴定,该菌株DL-XSY01为Rhodosporidium toruloides,命名为圆红冬孢酵母(Rhodosporidiumtoruloides)DL-XSY01。
(2)菌株DL-XSY01在YPD固体平板中生长良好,28℃培养24-48h,如图2所示,形成湿润、圆形、突起、光滑、浅粉色菌落;镜检发现菌体呈椭圆型长棒状,在4℃静置2d后呈现橘红色。最适生长温度28℃,最适pH5~6。
经形态学和26s rRNA鉴定,该EC降解菌株DL-XSY01暂定为Rhodosporidiumtoruloides。并已于2021年10月08日保藏于中国微生物菌种保藏管理委员会普通微生物中心CGMCC,保藏编号:CGMCC No.23534。保藏地址:中国北京市朝阳区北辰西路1号院3号中国科学院微生物研究所。
实施例2:圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01菌株EC降解制剂的制备
具体步骤如下:
(1)将圆红冬孢酵母DL-XSY01菌株接种于YPD液体培养基中进行活化,在25-30℃、150-250rpm恒温振荡培养24h,获得种子液。
(2)将种子液按10%接种量接种于含有YPD发酵培养基的生产发酵罐(装液量70%),通气量0.6~1.0m3/min,搅拌速率为300rpm,培养温度控制在28℃,培养时间为48~96h。发酵结束后得到菌体数量为3×108~1.8×109CFU/mL的DL-XSY01培养液。
发酵结束后,无菌条件下收集发酵液,直接用包装瓶分装成液体剂型。
(3)发酵完成后,将步骤(2)收集得到DL-XSY01培养液经冷冻真空干燥,利用去离子水回调体积至原体积的1/20,得到DL-XSY01发酵液;
(4)发酵完成后,将步骤(2)收集得到DL-XSY01培养液在4000g转速下离心10min收集DL-XSY01菌体沉淀物;
(5)将步骤(4)得到的菌体沉淀物用稀释剂PBS缓冲液稀释后,得到菌株DL-XSY01菌体悬液,其中菌浓为:OD 600=20;
(6)将步骤(5)得到的菌株DL-XSY01菌体悬液经过细胞破壁得到DL-XSY01细胞裂解液;
(7)分别将步骤(3)制备得到的DL-XSY01含菌发酵液、步骤(5)制备得到的DL-XSY01菌体悬液和步骤(6)制备得到的DL-XSY01细胞裂解液,经海藻酸钠包埋,制成相应的固定化小球,具体步骤如下:
将海藻酸钠(4%)分别与步骤(3)制备得到的DL-XSY01含菌发酵液、步骤(5)制备得到的DL-XSY01菌体悬液和步骤(6)制备得到的DL-XSY01细胞裂解液以体积比为1:1的比例混合,用10mL注射器吸取并以2-10滴/秒的速度缓慢滴入固化液(0.6%CaCl2的饱和硼酸溶液)中,固化时间约5h;制备得到固定化细胞;
将固定化细胞用生理盐水冲洗3-4次,置于壳聚糖(2%)溶液中覆膜40min。再次用0.8%生理盐水冲洗3-4次,沥干水分,4℃下保存备用,制备得到EC降解剂。
分别将步骤(3)制备得到的DL-XSY01含菌发酵液、步骤(5)制备得到的DL-XSY01菌体悬液和步骤(6)制备得到的DL-XSY01细胞裂解液所制备的包埋制剂分别为EC降解剂1、EC降解剂2、EC降解剂3。
(8)分别检测EC降解剂1、EC降解剂2、EC降解剂3中的DL-XSY01的菌浓,分别为:OD600=10、OD600=20和OD600=0。
实施例3:圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01制备得到的EC降解剂在白酒中EC降解的应用
具体步骤如下:
分别将实施例2制备得到的EC降解剂1、EC降解剂2、EC降解剂3,各20mL,分别处理含有EC的白酒样品,具体如下:
分别向60mL 45度白酒中添加EC降解剂1、EC降解剂2和EC降解剂3各20mL,分别在250mL发酵瓶中,28℃,100rpm反应5d。
对照组:向60mL 45度白酒中添加20mL YPD培养基,在250mL发酵瓶中,28℃,100rpm反应5d。
反应结束后分别吸取上清液2mL,过0.2μm滤膜,分别测定培养上清液中EC的残留量,每个处理3个重复,结果如表1所示。
表1:不同EC降解剂的EC降解率
结果显示:EC降解剂1、EC降解剂2和EC降解剂3均可以降低白酒中的EC浓度,可以将EC浓度由230.3737μg/L分别降低至86.9693μg/L、100.0902μg/L和55.3112μg/L,降解率分别为62.24%,56.56%和76.00%。
可见,EC降解剂3对于白酒中EC的降解效果最好。
实施例4:圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01制备得到的EC降解剂3在发酵食品中添加EC的降解实验
下述实施例中以EC降解剂3为例,证明本申请的菌株能够降解各种发酵食品及酒精饮品中的EC,下述采用的样品,均是市售产品。
下述实施例中所涉及的EC降解剂3的处理方法为:将圆红冬孢酵母DL-XSY01菌株接种于YPD液体培养基中进行活化,在25-30℃、150-250rpm恒温振荡培养24h,获得种子液。将种子液按10%接种量接种于含有YPD发酵培养基的生产发酵罐(装液量70%),通气量0.6~1.0m3/min,搅拌速率为300rpm,培养温度控制在28℃,培养时间为48~96h。发酵结束后得到菌体数量为3×108~1.8×109CFU/mL的DL-XSY01培养液。发酵完成后,收集得到DL-XSY01培养液在4000g转速下离心10min收集DL-XSY01菌体沉淀物;用稀释剂PBS缓冲液稀释后,得到菌株DL-XSY01菌体悬液,其中菌浓为:OD600=20;将菌体破壁得到DL-XSY01细胞裂解液,随后,与4%海藻酸钠以体积比为1:1的比例混合,用10mL注射器吸取并以2-10滴/秒的速度缓慢滴入固化液(0.6%CaCl2的饱和硼酸溶液)中,固化时间约5h;制备得到固定化细胞;将固定化细胞用生理盐水冲洗3-4次,置于壳聚糖(2%)溶液中覆膜40min。再次用0.8%生理盐水冲洗3-4次,沥干水分,4℃下保存备用。
1、制备红酒EC反应液:
红酒(12度)60mL;EC:3.0ppm;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,5天。
2、制备酸奶EC反应液:
酸奶60mL;EC:3.0ppm;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,5天。
3、制备醋EC反应液:
醋60mL;EC:3.0ppm;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,5天。
4、制备酱油EC反应液:
酱油60mL;EC:3.0ppm;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,5天。
5、制备酱EC反应液
酱30g,加入30mL去离子水,EC:3.0ppm;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,5天。
分别将上述所制得的发酵食品EC反应液,反应后吸取上清液2mL,过0.2μm滤膜,测定培养上清液中EC的残留量,同时设不接菌的YPD培养基作对照,每个处理3个重复,结果如表2所示。
表2:反应5天EC浓度
结果显示,DL-XSY01发酵产品及其EC降解剂对EC有很好的降解作用,发酵食品中乙醇含量、盐等成分对DL-XSY01的EC降解活性影响不大。
实施例5:圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01的应用
下述实施例中以EC降解剂3为例,证明本申请的菌株能够降解实际酒精饮品中的EC,下述采用的样品,均是市售产品。
下述实施例中所涉及的EC降解剂3的处理方法同实施例4。
1、制备芝麻香型白酒EC反应液:
芝麻香型白酒:(53度)60mL;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,2天。
2、制备浓香型白酒EC反应液:
浓香型白酒:(45度)60mL;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,2天。
3、制备酱香型白酒EC反应液
酱香型白酒:(42度)60mL;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,2天。
4、制备清香型白酒EC反应液
清香型白酒:(38度)60mL;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,2天。
5、制备黄酒EC反应液:
黄酒(15度)60mL;EC降解剂3:20mL,在250mL锥形瓶中温育,28℃,100rpm,2天。
分别将上述所制得的发酵食品EC反应液,反应后吸取上清液2mL,过0.2μm滤膜,测定培养上清液中EC的残留量,同时设不接菌的YPD培养基作对照,每个处理3个重复,结果如表3所示。
表3:反应2天的实际酒精饮品中EC浓度
结果显示,DL-XSY01发酵产品及其EC降解剂对实际发酵样品中EC有很好的降解作用,对酒精饮品中EC的降解率可以达到70%左右。
实施例6:圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01在发酵过程中降低EC含量的的应用
在下述实施例中,使用DL-XSY01处理发酵过程中的醋醅,证明本申请的菌株能够在发酵过程中降低EC的产生。
下述实施例中所涉及的DL-XSY01制备方法为:将圆红冬孢酵母DL-XSY01菌株接种于YPD液体培养基中进行活化,在25-30℃、150-250rpm恒温振荡培养24h,获得种子液;将种子液按10%接种量接种于含有YPD发酵培养基的生产发酵罐(装液量70%),通气量0.6~1.0m3/min,搅拌速率为300rpm,培养温度控制在28℃,培养时间为48~96h。发酵结束后得到菌体数量为3×108~1.8×109CFU/mL的DL-XSY01培养液。发酵完成后,收集得到DL-XSY01培养液经冷冻真空干燥,获得干燥菌体。
取5g冻干获得的菌体,加入100g醋醅中进行发酵20天,获得接菌发酵的白醋。另外直接发酵100g醋醅20天,获得未接菌发酵的白醋。
分别将上述的白醋吸取2mL,得顶EC残留量,每组样品设置3个重复,结果如表4所示。
表4:接菌发酵前后白醋中EC含量
结果显示,添加冻干后的DL-XSY01菌体,可以降低发酵过程中的EC浓度。
实施例7:圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01菌株的性质
具体步骤如下:
1、DL-XSY01菌株安全性评价
(1)抗生素敏感性实验
使用纸片扩散法对圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01的抗生素敏感性谱进行表征。
在YPD-琼脂固体平板上挑取DL-XSY01单菌落,转移至YPD液体培养基培养,获得菌液(约1×108cfu/mL);
取200μL DL-XSY01菌液涂布于YPD-琼脂固体平板中,分别缓慢放置庆大霉素(10μg)、链霉素(10μg)、红霉素(15μg)、四环素(30μg)、头孢氨苄(30μg)、万古霉素(30μg)、头孢唑林(30μg)、氨苄西林(10μg)、青霉素(10μg)、米诺环素(30μg)及阿米卡星(30μg)11种抗生素药敏纸片,每个纸片的间距不小于24mm;
将上述放有纸片的培养基,在28℃静置培养24h后测量并统计抑菌圈直径,分析其耐药性抗性R(≤14毫米),中期I(14-20毫米)或敏感S(≥20毫米),每组设置三个重复,DL-XSY01的抗生素敏感性如表5所示。
表5:DL-XSY01的抗生素敏感性
结果显示,菌株对抗生素头孢氨苄中度敏感,对10种抗生素头孢唑林、红霉素、庆大霉素、四环素、阿米卡星氨苄西林、链霉素、万古霉素、米诺环素和青霉素G敏感。因此,根据CLSI指南,这些结果证实DL-XSY01是安全的。
(2)溶血性实验
溶血性可分为三种,其中α溶血:又称草绿色溶血,菌落周围培养基出现1-2mm的草绿色环,为高铁血红蛋白所致,α溶血环中的红细胞未完全溶解,可形成α溶血环的细菌如甲型溶血性链球菌、肺炎链球菌;β溶血是在固体平板上培养时,菌落周围形成的宽大(2-4mm)、界限分明、完全透明的溶血环,β溶血环中的红细胞完全溶解,是菌体产生的溶血素使红细胞完全溶解所致,又称完全溶血,可形成β溶血环的包括乙型溶血性链球菌、金黄色葡萄球菌等;γ溶血:又称不溶血,在菌落周围无溶血环。
具体步骤如下:
培养基配置:哥伦比亚琼脂+5%脱纤维羊血。
在YPD-琼脂固体平板上挑取DL-XSY01单菌落,转移至YPD液体培养基培养,获得菌液(约1×108cfu/mL);
取菌液划线于含有5%脱纤维羊血的哥伦比亚平板中,28℃培养24h,之后观察是否有透明圈。金黄色葡萄球菌ATCC 25923作为阳性对照,每组设置三个重复。
结果显示,在此项溶血试验中,金黄色葡萄球菌ATCC 25923被用作阳性对照。DL-XSY01在羊血平板上28℃培养时未表现出溶血(γ-溶血)。然而,金黄色葡萄球菌ATCC25923显示出β-溶血作用,阳性对照成立。此外大肠杆菌Nissle 1917显示α-溶血。因此,DL-XSY01被认为是对人体健康无危害的安全的生物体。
2、DL-XSY01菌株益生性评价
(1)人工模拟胃液实验
益生菌要定植于胃肠道发挥益生作用,首先要对消化道环境具有一定的耐受性,对胃液的耐受性是其中重要筛选标准。
配制模拟胃液:稀盐酸16.4mL,加水约900mL,胃蛋白酶10g,均匀混合后加水定容至1000mL。分别调节pH为2.5,用0.22μm滤膜过滤除菌,4℃保存。
模拟胃液耐受性实验:
在YPD-琼脂固体平板上挑取DL-XSY01单菌落,转移至YPD液体培养基培养,获得菌液(约1×108cfu/mL),取5mL菌液于10000rpm,4℃离心5min收集菌体,用pH 7.4的无菌磷酸盐缓冲液洗涤2次,重复如上操作。
将菌体重新悬浮于5mL的pH 2.5的人工胃液中。采用平板涂布法计算在pH 2.5的人工模拟胃液中孵育0h和3h的活菌数量,每组设置三个重复。
存活率(%)=logCFU(N1)/logCFU(N0)*100%。
其中,N0表示在人工模拟胃液中孵育0h的活菌数,N1表示在人工模拟胃液中孵育3h后的活菌数。
同时,以大肠杆菌Nissle 1917作为阳性对照。
结果显示,在人工模拟胃液条件(含有0.3%胃蛋白酶,pH值为2.5)培养3h以后,DL-XSY01的存活率为86.73%,而阳性对照组大肠杆菌Nissle 1917的存活率为86.14%。结果表明,与大肠杆菌Nissle 1917相比,DL-XSY01在人工模拟胃液中有良好的存活率。
(2)人工模拟肠液实验
益生菌要定植于胃肠道发挥益生作用,首先要对消化道环境具有一定的耐受性,对肠液的耐受性是其中重要标准。
配置模拟肠液:用灭菌后的磷酸盐缓冲液(pH 7.4)将胰蛋白酶配制成浓度为1mg/mL溶液,在加入0.3%的牛胆盐,并用1mol/L氢氧化钠调节pH值至7.4,而后经0.22μm微孔滤膜过滤除菌后备用。
模拟肠液耐受性实验:
在YPD-琼脂固体平板上挑取DL-XSY01单菌落,转移至YPD液体培养基培养,获得菌液(约1×108cfu/mL);
取5mL菌液于10000rpm,4℃离心5min收集菌体,用pH 7.4的无菌磷酸盐缓冲液洗涤2次,重复如上操作。将菌体重新悬浮于5mL的pH 7.4的人工模拟肠液中。采用平板涂布法计算在pH 7.4人工模拟肠液中0h和4h的活菌数量,每组设置三个重复。
存活率(%)=logCFU(N1)/logCFU(N0)*100%
其中,N0代表在人工模拟肠液中孵育0h的活菌数,N1代表在人工模拟肠液中孵育3h后的活菌数。
同时,以大肠杆菌Nissle 1917作为阳性对照。
结果显示,在人工模拟肠液条件(含有0.3%胰蛋白酶和0.3%牛胆盐)培养4h以后,DL-XSY01的存活率为85.92%,而阳性对照组大肠杆菌Nissle 1917的存活率为84.64%。结果表明,与大肠杆菌Nissle 1917相比,DL-XSY01在人工模拟肠液中有良好的存活率。
(3)抗氧化实验
DPPH自由基清除率试验:
采用0.0078g DPPH,用无水乙醇溶解,定容至100ml,配制得到0.2mmol/L DPPH,避光放置,现配现用。
按照上述步骤(1)制备得到菌浓为108CFU/mL的DL-XSY01菌液;
将上述108CFU/mL的DL-XSY01菌液按照体积比为1:1的比例与100%乙醇DPPH溶液(0.2mM)混合,在25℃的黑暗中培养30min。
单独使用DL-XSY01菌液和100%乙醇作为空白,而DPPH乙醇溶液作为对照。在2330×g(4120rpm)下离心10分钟后收集上清液。在517nm处测量吸光度一式三份。
ABTS自由基清除率试验:
将ABTS(14mM)和过硫酸钾(5mM)溶解在0.1M磷酸钾缓冲液(pH 7.4)中,以1:1的比例混合,并在25℃下反应12~16h。
将100μL菌株DL-BJ01(108CFU/mL)添加到900μL ABTS溶液中,并在25℃下黑暗中培养15min。离心(14000g,1分钟)后,在734nm处测量上清液的吸光度。
结果显示,DL-XSY01的DPPH清除活性为90.02%,ABTS清除活性为93.67%,说明菌株DL-XSY01具有很好的抗氧化活性。
虽然本发明已以较佳实施例公开如上,但其并非用以限定本发明,任何熟悉此技术的人,在不脱离本发明的精神和范围内,都可做各种的改动与修饰,因此本发明的保护范围应该以权利要求书所界定的为准。
Claims (10)
1.一株圆红冬孢酵母(Rhodosporidium toruloides)DL-XSY01,已保藏于中国微生物菌种保藏管理委员会普通微生物中心,保藏编号为CGMCC No.23534,保藏日期为2021年10月08日。
2.权利要求1所述的圆红冬孢酵母DL-XSY01或其发酵液在制备可降解氨基甲酸乙酯的产品中的应用。
3.如权利要求2所述的应用,其特征在于,所述产品为化学品或微生物菌剂。
4.如权利要求3所述的应用,其特征在于,所述圆红冬孢酵母DL-XSY01在产品中的添加量至少为:3×108CFU/mL。
5.如权利要求2~4任一所述的应用,其特征在于,所述化学品包括但不限于氨基甲酸乙酯降解剂。
6.一种降解食品中氨基甲酸乙酯的方法,其特征在于,在食品的制备过程中,添加权利要求1所述的圆红冬孢酵母DL-XSY01或其发酵液进行氨基甲酸乙酯的降解,降解后除菌,制备得到食品。
7.如权利要求6所述的方法,其特征在于,所述食品包括但不限于发酵食品、酒精饮品。
8.如权利要求7所述的方法,其特征在于,所述食品为白酒、黄酒、红酒、酸奶、醋、酱油。
9.一种氨基甲酸乙酯降解剂,其特征在于,所述降解剂是按照下述方法制备得到的:
(1)将权利要求1所述的圆红冬孢酵母DL-XSY01接种于YPD液体培养基中进行活化,在25~32℃、150~250rpm恒温振荡培养24~48h,获得种子液;
(2)将所述种子液按10%-20%接种量接种于发酵培养基中,在25~32℃、通气量0.6~1.0m3/min,搅拌速率150~250rpm条件下,发酵至菌体数量3×108~1.8×109CFU/mL,得到圆红冬孢酵母DL-XSY01发酵产物;
(3)将步骤(2)制备得到的所述圆红冬孢酵母DL-XSY01发酵产物进行包埋,制成氨基甲酸乙酯降解剂。
10.权利要求1所述的圆红冬孢酵母DL-XSY01在氨基甲酸乙酯降解中的应用。
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