CN110551764B - 一种提高功能性红曲开环洛伐他汀含量的培养基及发酵方法 - Google Patents
一种提高功能性红曲开环洛伐他汀含量的培养基及发酵方法 Download PDFInfo
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Abstract
本发明公开了一种提高功能性红曲开环洛伐他汀含量的培养基及发酵方法,此培养基成分简单、成本低,发酵方法简洁,所得的功能性红曲纯度高、无杂质、开环洛伐他汀含量高。本发明的提高功能性红曲开环洛伐他汀含量的培养基,其所述的培养基组分为:大米、大豆粉和L‑谷氨酸,以大米重量100份计大豆粉用量为1.5~2%、L‑谷氨酸用量为1.5~2.5%。
Description
发明领域
本发明涉及一种培养基及发酵方法,更具体地说涉及一种提高功能性红曲开环洛伐他汀含量的培养基及发酵方法。
背景技术
红曲是以不黏性大米为原料,红曲菌经固态发酵而成的红曲米。主要产于福建,故又称福曲、丹曲等。红曲米在中国至少已有两千年以上药食两用的历史。红曲在国内主要用于酿酒、酿醋、腐乳、食品色素以及作为中药。在1979年,日本学者远藤章从红曲菌培养液中发现并提取出对胆固醇合成抑制作用的活性物质洛伐他汀(莫纳可林K),红曲的降脂功能成为现代红曲研究是主要方向。
近年来,随着生活水平的不断提高,由高胆固醇所引起的冠心病、高血脂、脑血栓、前列腺癌等疾病已威胁着人类的健康,降脂类产品的需求日益增多,由红曲菌天然发酵的以降胆固醇物质洛伐他汀为主要成分的功能性红曲渐渐走进人们的视野。研究表明,与从其它菌类提取或人工合成的洛伐他汀相比,红曲产品中的洛伐他汀结晶少、溶解度高,因而疗效更显著,毒副作用更小。洛伐他汀分为开环(酸式)和闭环(内酯式)两种结构,开环洛伐他汀的空间结构与人体内胆固醇合成途径中HMG-CoA还原酶(羟甲基戊二酰辅酶A)结构相似,能够直接抑制人体胆固醇的合成,而闭环洛伐他汀需要转化成开环才能被人体利用,因此功能性红曲产品中开环洛伐他汀的含量是衡量其产品质量的一个重要标准。
现有的功能性红曲的培养基及发酵方法多以大米为单一底物,发酵产品成分简单且不需要后处理,但存在洛伐他汀产量较低的问题;而以大米复配其他谷物作为复合底物的发酵制品,虽然可能有相对较高的洛伐他汀含量,但其中开环洛伐他汀的含量较低,而且其成分复杂、成本较高,存在食用口感不适、含有过敏原等安全隐患问题。因此需要开发一种提高功能性红曲开环洛伐他汀含量的培养基及发酵方法。
发明内容
本发明解决现有技术存在的不足,提供一种提高功能性红曲开环洛伐他汀含量的培养基及发酵方法,此培养基成分简单、成本低,发酵方法简洁,所得的功能性红曲纯度高、无杂质、开环洛伐他汀含量高。
本发明是通过以下技术方案实现的:
本发明的提高功能性红曲开环洛伐他汀含量的培养基,其所述的培养基组分为:大米、大豆粉和L-谷氨酸,以大米重量100份计大豆粉用量为1.5~2%、L-谷氨酸用量为1.5~2.5%。
本发明利用上述的培养基制备功能性红曲的发酵方法,其包括以下步骤:
A、制备种子液:将紫红曲霉MY-21菌株接种于PDA培养基上,30~32℃培养7~8d活化;用无菌水将培养基上的孢子洗脱下来,摇匀打散孢子团粒,获得孢子悬液;将所述的孢子悬液接种到液体种子培养基中,培养得到紫红曲霉株种子液;
B、固态发酵:在无菌条件下向培养基质中接入所述的紫红曲霉株种子液,封口后移入培养室发酵培养,获得红曲产品;
其中所述的紫红曲霉(Monascus purpureus)MY-21菌株的菌种已在中国微生物菌种保藏管理委员会普通微生物中心保藏,保藏编号为:CGMCC No.18110,保藏日期为:2019年7月19日。本发明的紫红曲霉MY-21菌株的形态特征如下:PDA培养基上的菌落呈膜状蔓延生长,表面有褶皱和气生菌丝,初期菌丝体为白色,后变为红色,老后为紫红色,背面紫红色;菌丝具横隔,多核,分枝甚繁不规律,细胞内有颗粒;分生孢子球形或梨形,着生于菌丝及其分枝的顶端;闭囊壳球形,橙红色;子囊球形,成熟后消失;子囊孢子卵圆形。ITS序列分析结果表明,与紫红曲霉的相似度高达99%。
本发明上述的发酵方法,其进一步的技术方案是步骤A中所述的孢子悬液按体积百分比5%的接种量接到液体种子培养基中,在30~32℃、180r/min条件下,振荡培养48h。更进一步的技术方案是步骤A中所述的孢子悬液的浓度为106cfu/mL。
本发明上述的发酵方法,其进一步的技术方案还可以是步骤A中所述的液体种子培养基组分为:葡萄糖60g/L,蛋白胨25g/L,玉米粉10g/L,NaNO32g/L,K2HPO41g/L,MgSO4.7H2O1g/L,调节pH5.0~6.0。
本发明上述的发酵方法,其进一步的技术方案还可以是步骤B中所述的固态发酵包括常温发酵和低温发酵两个阶段,先进行常温发酵,后进行低温发酵,所述的常温发酵阶段培养条件为:32℃条件下培养3d;所述的低温发酵阶段培养条件为:18~22℃条件下培养18~20d,湿度均为60%~75%。更进一步的技术方案是所述的低温发酵阶段的第5天,将1~1.5%的L-谷氨酸溶于10mL无菌水,在无菌条件下加入发酵基质中。
本发明上述的发酵方法,其进一步的技术方案还可以是所述的固态发酵结束后,将培养基质于45~55℃条件下烘干,再经打碎后过40目筛,即得最终功能性红曲成品。
本发明的有益效果是:
本发明采用普通大米为单一底物优化发酵培养基的组分及配比,从红曲固态发酵的不同阶段入手优化发酵工艺方法,创新性的在功能性红曲固态发酵过程的常温和低温发酵阶段分别添加能够刺激其次级代谢的L-谷氨酸,此培养基成分简单、成本低,发酵方法简洁,所得的功能性红曲纯度高、无杂质,开环洛伐他汀含量高,开环洛伐他汀产量最高可达7.287mg/g;符合《中华人民共和国轻工业行业标准》、《保健食品检验与评价技术规范》以及《中国药典》中红曲的质量标准。
附图说明
图1为HPLC检测开环洛伐他汀标准曲线
图2为实施例1开环洛伐他汀HPLC色谱图,注:保留时间10.706min处为开环洛伐他汀,峰面积为4536.94mAU*s
图3为实施例2开环洛伐他汀HPLC色谱图,注:保留时间10.705min处为开环洛伐他汀,峰面积为4348.5mAU*s
图4为实施例3开环洛伐他汀HPLC色谱图,注:保留时间10.709min处为开环洛伐他汀,峰面积为4701.82mAU*s
图5为实施例4开环洛伐他汀HPLC色谱图,注:保留时间10.709min处为开环洛伐他汀,峰面积为4055.3mAU*s
具体实施方式
本发明的紫红曲霉MY-21菌株,该菌种已在中国微生物菌种保藏管理委员会普通微生物中心保藏,保藏编号为:CGMCC No.18110。
下述实施例中,如无特殊说明,均为常规方法;下述实施例中所用的试剂及原料,如无特殊说明,均为常规途径购买获得;下述实施例中的%,如无特殊说明,均为质量百分含量。
实施例1
培养基组分为:大米、大豆粉和L-谷氨酸,以大米重量100份计大豆粉用量为1.5%、L-谷氨酸用量为2.5%。
1)菌株活化液的制备
将紫红曲霉CGMCC No.18110菌株接种于PDA培养基上,32℃培养7d活化。用无菌水将培养基上的孢子洗脱下来,打散摇匀,制成浓度为106cfu/mL的孢子悬液。将孢子悬液按5%的接种量接种到液体种子培养基中,在32℃,180r/min条件下,振荡培养48h,即制得紫红曲霉株活化液。
液体种子培养基组分为:葡萄糖60g/L,蛋白胨25g/L,玉米粉10g/L,NaNO32g/L,K2HPO41g/L,MgSO4.7H2O1g/L,自然pH,121℃灭菌20min。
2)发酵培养基质的制备
将大米浸泡1h,沥干水分,蒸熟,称取150g放入500mL三角瓶中,加入1.5%的大豆粉和2%的L-谷氨酸,拌匀,121℃灭菌20min。
3)接种
在无菌条件下,向每个三角瓶中的固态发酵基质中接入15的紫红曲霉株活化液,封口后放入培养箱培养。
4)固态发酵
固态发酵包括常温发酵和低温发酵两个阶段,先进行常温发酵,后进行低温发酵,所述的常温发酵阶段培养条件为:32℃条件下培养3d。所述的低温发酵阶段培养条件为:18℃条件下培养20d,湿度均为60%~75%。在固态发酵低温阶段的第5天,将4%的L-谷氨酸溶于10mL无菌水,在无菌条件下均匀滴入发酵基质中,继续低温发酵直至发酵结束。固态发酵结束后,将培养基质于45℃条件下烘干,再经打碎后过40目筛,即得最终功能性红曲成品。
经高效液相色谱法(HPLC)检测,开环洛伐他汀产量最高可达7.03mg/g(见图2)。
实施例2
培养基组分为:大米、大豆粉和L-谷氨酸,以大米重量100份计大豆粉用量为2%、L-谷氨酸用量为1.5%。
1)菌株活化液的制备
将紫红曲霉CGMCC No.18110菌株接种于PDA培养基上,32℃培养7d活化。用无菌水将培养基上的孢子洗脱下来,打散摇匀,制成浓度为106cfu/mL的孢子悬液。将孢子悬液按5%的接种量接种到液体种子培养基中,在32℃,180r/min条件下,振荡培养48h,即制得紫红曲霉株活化液。
液体种子培养基组分为:葡萄糖60g/L,蛋白胨25g/L,玉米粉10g/L,NaNO32g/L,K2HPO41g/L,MgSO4.7H2O1g/L,自然pH,121℃灭菌20min。
2)发酵培养基质的制备
将大米浸泡1.5h,沥干水分,蒸熟,称取150g放入500mL三角瓶中,加入2%的大豆粉和1.5%的L-谷氨酸,拌匀,121℃灭菌20min。
3)接种
在无菌条件下,向每个三角瓶中的固态发酵基质中接入17.5%的紫红曲霉株活化液,封口后放入培养箱培养。
4)固态发酵
固态发酵包括常温发酵和低温发酵两个阶段,先进行常温发酵,后进行低温发酵,所述的常温发酵阶段培养条件为:32℃条件下培养3d。所述的低温发酵阶段培养条件为:20℃条件下培养19d,湿度均为60%~75%。在固态发酵低温阶段的第5天,将2.5%的L-谷氨酸溶于10mL无菌水,在无菌条件下均匀滴入发酵基质中,继续低温发酵直至发酵结束。固态发酵结束后,将培养基质于50℃条件下烘干,再经打碎后过40目筛,即得最终功能性红曲成品。
经高效液相色谱法(HPLC)检测,开环洛伐他汀产量最高可达6.736mg/g(见图3)。
实施例3
培养基组分为:大米、大豆粉和L-谷氨酸,以大米重量100份计大豆粉用量为1.75%、L-谷氨酸用量为1.75%。
1)菌株活化液的制备
将紫红曲霉CGMCC No.18110菌株接种于PDA培养基上,32℃培养7d活化。用无菌水将培养基上的孢子洗脱下来,打散摇匀,制成浓度为106cfu/mL的孢子悬液。将孢子悬液按5%的接种量接种到液体种子培养基中,在32℃,180r/min条件下,振荡培养48h,即制得紫红曲霉株活化液。
液体种子培养基组分为:葡萄糖60g/L,蛋白胨25g/L,玉米粉10g/L,NaNO32g/L,K2HPO41g/L,MgSO4.7H2O1g/L,自然pH,121℃灭菌20min。
2)发酵培养基质的制备
将大米浸泡2h,沥干水分,蒸熟,称取150g放入500mL三角瓶中,加入2%的大豆粉和2.5%的L-谷氨酸,拌匀,121℃灭菌20min。
3)接种
在无菌条件下,向每个三角瓶中的固态发酵基质中接入20%的紫红曲霉株活化液,封口后放入培养箱培养。
4)固态发酵
固态发酵包括常温发酵和低温发酵两个阶段,先进行常温发酵,后进行低温发酵,所述的常温发酵阶段培养条件为:32℃条件下培养3d。所述的低温发酵阶段培养条件为:22℃条件下培养18d,湿度均为60%~75%。在固态发酵低温阶段的第5天,将4%的L-谷氨酸溶于10mL无菌水,在无菌条件下均匀滴入发酵基质中,继续低温发酵直至发酵结束。固态发酵结束后,将培养基质于55℃条件下烘干,再经打碎后过40目筛,即得最终功能性红曲成品。
经高效液相色谱法(HPLC)检测,开环洛伐他汀产量最高可达7.287mg/g(见图4)。
实施例4
培养基组分为:大米、大豆粉和L-谷氨酸,以大米重量100份计大豆粉用量为1.75%、L-谷氨酸用量为1.75%。
1)菌株活化液的制备
将紫红曲霉CGMCC No.18110菌株接种于PDA培养基上,32℃培养7d活化。用无菌水将培养基上的孢子洗脱下来,打散摇匀,制成浓度为106cfu/mL的孢子悬液。将孢子悬液按5%的接种量接种到液体种子培养基中,在32℃,180r/min条件下,振荡培养48h,即制得紫红曲霉株活化液。
液体种子培养基组分为:葡萄糖60g/L,蛋白胨25g/L,玉米粉10g/L,NaNO32g/L,K2HPO41g/L,MgSO4.7H2O1g/L,自然pH,121℃灭菌20min。
2)发酵培养基质的制备
将大米浸泡2h,沥干水分,蒸熟,称取150g放入500mL三角瓶中,加入2%的大豆粉和2%的L-谷氨酸,拌匀,121℃灭菌20min。
3)接种
在无菌条件下,向每个三角瓶中的固态发酵基质中接入17.5%的紫红曲霉株活化液,封口后放入培养箱培养。
4)固态发酵
固态发酵包括常温发酵和低温发酵两个阶段,先进行常温发酵,后进行低温发酵,所述的常温发酵阶段培养条件为:32℃条件下培养3d。所述的低温发酵阶段培养条件为:20℃条件下培养20d,湿度均为60%~75%。在固态发酵低温阶段的第5天,将3.25%的L-谷氨酸溶于10mL无菌水,在无菌条件下均匀滴入发酵基质中,继续低温发酵直至发酵结束。固态发酵结束后,将培养基质于50℃条件下烘干,再经打碎后过40目筛,即得最终功能性红曲成品。
经高效液相色谱法(HPLC)检测,开环洛伐他汀产量最高可达6.28mg/g(见图5)。
Claims (7)
1.一种提高功能性红曲开环洛伐他汀含量的发酵方法,其特征在于包括以下步骤:
A、制备种子液:将紫红曲霉MY-21菌株接种于PDA培养基上,30~32℃培养7~8d活化;用无菌水将培养基上的孢子洗脱下来,摇匀打散孢子团粒,获得孢子悬液;将所述的孢子悬液接种到液体种子培养基中,培养得到紫红曲霉菌 株种子液;
B、固态发酵:在无菌条件下向培养基质中接入所述的紫红曲霉菌 株种子液,封口后移入培养室发酵培养,获得红曲产品;所述的培养基质组分为:大米、大豆粉和L-谷氨酸,以大米重量100份计大豆粉用量为1.5~2%、L-谷氨酸用量为1.5~2.5%;
其中所述的紫红曲霉(Monascus purpureus)MY-21菌株的菌种已在中国微生物菌种保藏管理委员会普通微生物中心保藏,保藏编号为:CGMCC No.18110。
2.根据权利要求1所述的发酵方法,其特征在于步骤A中所述的孢子悬液按体积百分比5%的接种量接到液体种子培养基中,在30~32℃、180r/min条件下,振荡培养48h。
3.根据权利要求2所述的发酵方法,其特征在于步骤A中所述的孢子悬液的浓度为106cfu/mL。
4.根据权利要求1所述的发酵方法,其特征在于步骤A中所述的液体种子培养基组分为:葡萄糖60g/L,蛋白胨25g/L,玉米粉10g/L,NaNO3 2g/L,K2HPO4 1g/L,MgSO4.7H2O 1g/L,调节pH5.0~6.0。
5.根据权利要求1所述的发酵方法,其特征在于步骤B中所述的固态发酵包括常温发酵和低温发酵两个阶段,先进行常温发酵,后进行低温发酵,所述的常温发酵阶段培养条件为:32℃条件下培养3d;所述的低温发酵阶段培养条件为:18~22℃条件下培养18~20d,湿度均为60%~75%。
6.根据权利要求5所述的发酵方法,其特征在于所述的低温发酵阶段的第5天,将2.5~4%的L-谷氨酸溶于10mL无菌水,在无菌条件下加入发酵基质中。
7.根据权利要求1所述的发酵方法,其特征在于所述的固态发酵结束后,将培养基质于45~55℃条件下烘干,再经打碎后过40目筛,即得最终功能性红曲成品。
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