CN108441429B - 一种小核菌及其发酵生产硬葡聚糖的方法 - Google Patents
一种小核菌及其发酵生产硬葡聚糖的方法 Download PDFInfo
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Abstract
本发明公开了一种小核菌及其发酵生产硬葡聚糖的方法,属于微生物技术领域。本发明提供的菌株CCTCC NO:M2017646可以在葡萄糖碳源浓度为75g/L的条件下发酵56h达到硬葡聚糖产量近20g/L的效果,明显优于目前国际上硬葡聚糖在150g/L蔗糖的培养条件下72h产量26g/L的效果,底物利用率提高58%,成本降低明显。优于现有的葡聚糖生产工艺,具有重要的工业化应用前景。
Description
技术领域
本发明涉及一种小核菌及其发酵生产硬葡聚糖的方法,属于微生物技术领域。
背景技术
硬葡聚糖又称为小核菌多糖,是高分子量,非离子型的支链葡聚糖。它是以β-D-(1-3)吡喃葡萄糖基为主链,每三个葡萄糖由β-D-(1-6)吡喃葡萄糖基为侧链的葡聚糖。硬葡聚糖可由小核菌属丝状真菌纯培养发酵得到。
硬葡聚糖具有耐高温、各种电解质(5%NaCl、5%Na2SO4、20%CaCl2等)以及广范的pH等特性。在食品行业作为增稠剂、凝胶剂或稳定剂广泛应用,在制药行业作为药片涂层、眼用滴液等。
目前已有微生物生产硬葡聚糖,然而,由于硬葡聚糖通常由真菌发酵生产,发酵产率不高,从而导致其价格居高不下,这严重限制了其市场(特别是石油工业领域)的开发拓展。已有报道的关于硬葡聚糖发酵生产的研究多集中于发酵培养基的优化,但其仍然存在发酵时间长(96h以上),生产工艺复杂,生产成本较高等缺陷。因此,一种工艺简单、生产效率日升的硬葡聚糖发酵方法对于实现硬葡聚糖的大规模工业化生产具有重要的意义。
生产硬葡聚糖最广泛应用的是齐整小核菌,在PDA培养基上,菌丝体白色,有绢丝光泽,从中央向四周辐射状扩展,菌丝易纠结,纠结的菌丝会不断紧缩,最后发育成菌核。菌核初期为白色小圆点,中期藏黄色,油菜籽状,后期菌核呈褐色。
国内关于硬葡聚糖生产的报道主要有,中国科学院微生物研究所任永娥等以葡萄糖和酵母膏为基础培养基进行16L自控罐发酵,产量达到14.14g/L,多糖对底物的转化率为47.52%;吉林农业大学李鸿梅等以玉米淀粉和玉米黄浆为基础培养基进行摇瓶发酵,产量达到16.1g/L,多糖对底物的转化率为24%。国外对硬葡聚糖的主要介绍有,Shrikant A等利用蔗糖和酵母浸粉进行摇瓶发酵,产量高达16.58g/L,底物对多糖的转化率为20.7%;J.I.Farina等利用蔗糖和酵母浸粉进行10L自控罐发酵,产量高达26.0g/L,多糖对底物的转化率为17%。目前,硬葡聚糖生产碳源主要为蔗糖,虽然产量达到26g/L,但是底物利用率偏低,生产成本较高,资源浪费严重。运用玉米淀粉和玉米黄浆生产硬葡聚糖并不适用与所有地区,而且产物的后续处理比较麻烦。
发明内容
本发明的第一个目的是提供一种小核菌(Sclerotium rolfsii)WSH-G01,已于2017年11月1日保藏于中国典型培养物保藏中心,保藏编号为CCTCC NO:M2017646,保藏地址为中国武汉大学。
本发明的第二个目的是提供所述菌株在发酵领域制备食品中的应用。
本发明的第三个目的是提供一种硬葡聚糖生产方法,所述方法是将所述小核菌接种于发酵培养基中,培养24~96h。
在本发明的一种实施方式中,所述发酵培养基的成分为:葡萄糖45~75g/L,硝酸钠2.0~3.0g/L,酵母膏0.2~1.0g/L,KH2PO4 1.0g/L,MgSO4·7H2O 0.5g/L,柠檬酸1.5g/L,KCl 0.5g/L,pH 4.5。
在本发明的一种实施方式中,控制发酵过程通气量为1~3vvm。
有益效果:本发明提供了一种葡聚糖生产效率高的菌株,该菌株可以在葡萄糖碳源浓度为75g/L的条件下发酵56h达到硬葡聚糖产量近20g/L的效果,明显优于目前国际上硬葡聚糖在150g/L蔗糖的培养条件下72h产量26g/L的效果,底物利用率提高58%,成本降低明显。优于现有的葡聚糖生产工艺,具有重要的工业化应用前景。
生物材料保藏
一种小核菌(Sclerotium rolfsii)WSH-G01,已于2017年11月1日保藏于中国典型培养物保藏中心,保藏编号为CCTCC NO:M2017646,保藏地址为中国武汉大学。
附图说明
图1为不同碳源浓度下的发酵效果;其中,A为葡萄糖浓度55g/L的发酵结果;B为葡萄糖浓度75g/L的发酵结果;C为葡萄糖浓度95g/L的发酵结果;▲生物量;■草酸;●硬葡聚糖;pH;◆残糖。
图2为不同通气量下的发酵效果;其中A为通风比1vvm;B为通风比2vvm;C为通风比3vvm;▲生物量;■草酸;●硬葡聚糖;pH;◆残糖。
具体实施方式
种子培养基(g/L):葡萄糖30;KH2PO4 1.0;NaNO3 3.0;酵母浸粉1.0;KCl 0.5;MgSO4·7H2O 0.5;pH 4.0
PDA培养基(g/L):马铃薯200(切块、经水煮烂后过滤),葡萄糖20。
生物质的测定方法:向发酵液中加入3倍体积蒸馏水后,混匀。5mol/L NaOH调节pH7.0。将混合液置于80℃水浴中保温30min。冷却,10 000rpm/min离心15min,除去上清,水洗2~3次,置于105℃烘干至恒重。
草酸的测定方法:采用Agilent 1260高效液相色谱(HPLC)进行测定。HPLC检测条件:色谱柱:Aminex HPX-87H(Bio-Rad);流动相:5mmol/L H2SO4;流速:0.4mL/min;柱温:40℃;进样量:10μL;检测器:紫外检测器。
硬葡聚糖的检测方法:向发酵液中加入3倍体积蒸馏水后,混匀。5mol/LNaOH调节pH7.0。将混合液置于80℃水浴中保温30min。冷却,10 000rpm/min离心15min,取澄清的多糖水溶液等除蛋白,加入等体积无水乙醇醇沉16h。挑取醇沉多糖,105℃烘干至恒重。
残糖测定方法:取发酵液1mL于1.5mL离心管中,10 000rpm/min离心3min,稀释50倍,用残糖仪进行测定葡萄糖剩余量。
实施例1菌株的分离与鉴定
将前期分离出的菌株接种于PDA培养基,提取菌株基因组DNA,扩增18S rDNA的基因序列(PCR扩增的通用引物为NS1F和NS8R)。将PCR产物经1%琼脂糖凝胶电泳鉴定,结果良好。将PCR扩增产物寄送生工生物工程(上海)股份有限公司进行测序,将测序结果在NCBI网站上进行BLAST序列比对,确定为小核菌(Sclerotium rolfsii)。
本发明提供的小核菌与现有小核菌的重点实质性区别:本发明提供的小核菌相比于现有的小核菌更易利用葡萄糖生产硬葡聚糖,在含有同等浓度的蔗糖和葡萄糖的培养基中,在葡萄糖培养基中产量明显优于蔗糖培养基。在摇瓶培养条件下,初始葡萄糖浓度为55g/L,产量达到11.96g/L,明显优于同等条件下初始蔗糖浓度55g/L时产量为7.5g/L。在3L发酵罐初始葡萄糖浓度为75g/L时,产量达到20g/L,而在10L发酵罐初始蔗糖浓度为150g/L时,产量达到26g/L,利用葡萄糖生产硬葡聚糖,生产成本更低,产物利用率更高。
实施例2小核菌的培养及硬葡聚糖的发酵
发酵培养基(g/L):KH2PO4 1.0;KCL 0.5;柠檬酸1.5;MgSO4·7H2O 0.5g/L;pH4.0;添加不同量的葡萄糖(45、50、55)、NaNO3(2、2.25、2.5)、酵母浸粉(0.2、0.37、0.5)。
摇瓶培养:取适量菌丝接种于装有50ml种子培养基的250ml摇瓶中,于28℃,220r/min条件下培养72h,以5%的接种量转移至加有25ml葡萄糖发酵培养基的250ml摇瓶中,于30℃、220r/min条件下培养96h。
分别调整发酵培养基的部分组分(如表1所示),其余成分保持不变:
表1发酵培养基的成分调整及对应产量
编号 | 葡萄糖(g/L) | NaNO<sub>3</sub>(g/L) | 酵母浸粉(g/L) | 葡聚糖产量(g/L) |
1 | 45 | 2.0 | 0.5 | 9.18 |
2 | 50 | 2.0 | 0.5 | 9.45 |
3 | 55 | 2.0 | 0.5 | 11.72 |
4 | 55 | 2.25 | 0.5 | 11.96 |
5 | 55 | 2.5 | 0.5 | 10.98 |
6 | 55 | 2.0 | 0.2 | 11.71 |
7 | 55 | 2.0 | 0.37 | 11.82 |
结果显示,采用培养基配方(g/L):葡萄糖55;NaNO3 2.25;酵母浸粉0.5;KH2PO41.0;KCL 0.5;柠檬酸1.5;MgSO4·7H2O 0.5时效果最好,葡聚糖产量达11.96g/L。目前国际上硬葡聚糖的生产大多采用蔗糖作为碳源,我们利用葡萄糖作为碳源,在相同碳源浓度的条件下硬葡聚糖产量明显提高(蔗糖55g/L时产量在7.5g/L)。
实施例3不同碳源浓度对硬葡聚糖生产的影响
具体实施方式同实施例2,区别在于,发酵培养基配方为:硝酸钠2.2g/L,酵母膏0.5g/L,KH2PO4 1.0g/L,MgSO4·7H2O 0.5g/L,柠檬酸1.5g/L,KCl 0.5g/L,pH 4.5;分别采用不同葡萄糖添加量(55、75、95g/L)探究碳源对硬葡聚糖产量的影响。
3L发酵罐分批培养:将28℃、220r/min条件下培养72h的上述种子液,按5%的接种量转接至加有100ml种子液的500ml摇瓶中,于28℃、220r/min条件下培养48h,然后以5%的接种量接种于装有1.5L发酵培养基的3L发酵罐中培养96h,温度设置为30℃,搅拌转速350r/min。
发酵结果如图2所示,其中在碳源控制在75g/L时效果最为显著,在此条件下56hScleroglucan产量达到19.69g/L,比碳源55g/L和95g/L,分别提高了13%和7%。生产强度为0.35,比碳源55g/L和95g/L,分别提高了10%和22%。可见发酵罐上最适碳源为75g/L。
实施例4不同通气对硬葡聚糖产量影响
发酵过程中的溶氧情况是影响菌体生长与产物合成的重要因素,而改变溶氧状态的最直接方式就是改变通气量。文献报道低通气更适合Scleroglucan的生产。本发明在碳源优化的基础上进行了通气优化在3L罐上采用不通通气(1、2、3vvm)对小核菌合成硬葡聚糖的影响。其中通气在1vvm时效果最为显著。发酵56h产量为20.86g/L,比通气2vvm和3vvm分别提高了19%和31%。生产强度为0.37,比通气2vvm和3vvm分别提高了19%和32%。可见Scleroglucan发酵控制最适通气为1vvm。
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 (9)
1.一种小核菌(Sclerotium rolfsii)WSH-G01,已于2017年11月1日保藏于中国典型培养物保藏中心,保藏编号为CCTCC NO:M2017646,保藏地址为中国武汉大学。
2.权利要求1所述菌株在发酵制备葡聚糖中的应用。
3.一种生产葡聚糖的方法,其特征在于,将权利要求1所述小核菌接种于发酵培养基中,培养24~96h;所述发酵培养基的成分为:葡萄糖45~75g/L,硝酸钠2.0~3.0g/L,酵母膏0.2~1.0g/L,KH2PO4 0.5~1.0g/L,MgSO4·7H2O 0.5~1.0g/L,柠檬酸1.0~1.5g/L,KCl0.5~1.0g/L,pH4.0~4.5。
4.根据权利要求3所述的一种生产葡聚糖的方法,其特征在于,控制发酵过程通气量为1~3vvm。
5.根据权利要求3所述的一种生产葡聚糖的方法,其特征在于,所述发酵培养基的成分为:葡萄糖55~60g/L,硝酸钠2.0~3.0g/L,酵母膏0.5~1.0g/L,KH2PO4 1.0g/L,MgSO4·7H2O 0.5g/L,柠檬酸1.5g/L,KCl 0.5g/L,pH4.0~4.5。
6.权利要求1所述菌株在制备食品增稠剂中的应用。
7.权利要求1所述菌株在制备食品凝胶剂中的应用。
8.权利要求1所述菌株在制备药片涂层中的应用。
9.权利要求1所述菌株在制备眼用滴液中的应用。
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