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桑黄菌的物理诱变与发酵研究
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摘要
为了进一步开发利用桑黄菌这一中药资源,对桑黄菌生物学特性、成分、药理作用等研究现状进行了综述。在资料分析及现有研究的基础上,本课题对桑黄菌的发酵菌株选育、发酵、多糖提取和多糖活性进行了研究。
     桑黄菌培养生长较慢,不易诱导出分生孢子,只能从菌丝中分离原生质体。原生质体分离及再生适宜的条件为:菌龄为10d的菌丝,以甘露醇作为分离和再生渗透压稳定剂,用1.5%溶壁酶+0.5%崩溃酶的组合酶系酶解,酶解温度为30℃,酶解时间为3h,用改良PDA再生培养基进行再生。
     四种诱变方式中激光(LA)诱变与激光-紫外线(LA-UV)复合诱变后筛选的变异菌株平均发酵产量分别为11.57+1.86mg/mL和8.52±1.52mg/mL,表现较好;近一步比较发现LA诱变与LA-UV复合诱变的正变异率分别为6.08%和5.52%,LA-UV复合诱变后菌株变异幅度较大,增产潜力较大,在筛选量较大时使用较好。
     通过原生质体紫外线诱变,选出生长较快的变异菌株S2。以S2的原生质体进行LA-UV复合诱变,经5代筛选,选出5株变异菌株,5株变异株遗传稳定性较好,与出发菌株均产生拮抗作用,酯酶与过氧化物酶的同功酶电泳图谱与出发菌株比较发生了变化。
     建立了桑黄菌胞内与胞外多糖发酵产量检测方法,检测了选出菌株的发酵产量,多糖发酵产量最高的菌株为SJZ2,比出发菌株增产36.88%。
     筛选并优化了SJZ2的发酵培养基。发现,最好的碳源为小麦粉,最好的氮源为米糠。优化培养基组成为:小麦粉5.16%、米糠1.38%、磷酸二氢钾0.094%、硫酸镁0.054%。在试验范围内,影响菌丝发酵产量的顺序为:米糠含量>小麦粉含量>磷酸二氢钾含量>硫酸镁含量。经试验验证,回归模型预测性较好。
     对影响摇瓶发酵产量的单因素进行了试验,在此基础上对发酵工艺进行了优化,优化后的发酵条件是:装瓶量120mL/250mL、接种量17mL、温度26℃、转速135r/min。在试验范围内,影响SJZ2菌丝发酵产量的顺序为:温度>接种量>转速>装瓶量。经试验验证,回归模型预测性较好。
     研究了摇瓶发酵过程中菌丝产量、发酵液中可溶性蛋白含量、多糖含量、粘度、LiP的活性、MnP的活性、Lac的活性、纤维素酶对羧甲基纤维素的活性和纤维素酶对滤纸的活性动态变化,并测出LiP、MnP、Lac的米氏常数和最大反应速度。
     在摇瓶发酵的基础上进行了发酵罐发酵试验。试验最佳发酵条件为:装罐量70%、接种量10%、搅拌速度180r/min、温度29℃、空气流量1:0.6v/v.m。在此条件下,3.5L发酵培养基产菌丝68.23±2.51g(n=3),产胞外粗多糖10.23±0.35g(n=3)。
     用复合酶提取桑黄菌多糖。对提取用酶进行了筛选及复合,筛选得到的提取用酶为:纤维素酶、蜗牛酶、溶壁酶和中性蛋白酶Neutrase,4种酶复合质量比为3:1:0.5:4。在多糖提取单因素研究的基础上,通过优化试验,得到多糖得率最高的提取条件为:pH值6.5、温度40.9℃、提取时间3.78h、加酶量3.37%。多糖纯度最高的提取条件为:pH值6.7、温度34.5℃、提取时间2.35h、加酶量2.57%。在试验范围内,影响多糖得率的顺序为:pH值>加酶量>温度>提取时间。影响多糖纯度的顺序为:提取时间>pH值>温度>加酶量。经试验验证,回归模型预测性较好。
     对桑黄菌多糖(PIPS)的部分理化性质进行了研究,碘-碘化钾试剂反应为阴性,α-萘酚反应为阳性,斐林试剂反应为阴性,25℃时EPS(胞外多糖)特性粘度为0.85dL/g,IPS(胞内多糖)特性粘度为1.20dL/g。
     对PIPS进行分级分离,从EPS中得到2个组分EPS_(0.1)和EPS_(0.2),从IPS中得到8个组分:IPS_(0.01)、IPS_(0.02)和IPS_(0.1)等。对PIPS及部分组分测定单糖组成,得IPS的单糖组成及摩尔比为:1(Xy1):50(Rha):33(Ara):225(Man):375(Glu);IPS_(0.1)的单糖组成及摩尔比为:10(Rha):33(Man):70(Glu);IPS_(0.01)的单糖组成及摩尔比为:9(Man):5(Glu);EPS的单糖组成及摩尔比为:1(Gal):35(Man):35(Glu);EPS_(0.1)的单糖组成及摩尔比为:7(Man):5(Glu);EPS_(0.2)的单糖组成及摩尔比为:13(Man):5(Glu)。
     桑黄菌多糖的抗氧化活性有较好的量效关系,通过对量效关系曲线回归并计算出:清除DPPH·时,IPS的EC_(50)值为1.09mg/mL,EPS的为1.52mg/mL;清除·OH时,EPS的EC_(50)值为0.23mg/mL,IPS的为0.78mg/mL;清除O_2~-·时,EPS的EC_(50)值为20.31μg/mL,IPS的为29.97μg/mL;螯合Fe~(2+)时,IPS的EC_(50)值为1.36mg/mL,EPS的为1.66mg/mL;试验范围内IPS的还原能力(y)与IPS浓度(x)的量效关系为:y=1.3023x+0.0178(R~2=0.9991),EPS的还原能力(y)与EPS浓度(x)的量效关系为:y=1.8004x+0.0185(R~2=0.9992)。
In order to exploit and utilize Phellinus igniarius as national resources of Chinese medicinal materials farther and wider,the research status of biological characteristics, composition and pharmacological action of Phellinus igniarius was reviewed in this paper.Based on analysis of literatures and recent researches,selective breeding of fermentation strains,fermentation technology,polysaccharide extraction and activities of the polysaccharide were studied.
     Phellinus igniarius growed slowly in the process of culture,Conidium was difficult to induce,so protoplast only can be separated from mycelium.The suitable conditions of protoplast separation and regeneration were as follows:mycelial age 10d, mannitol as osmotic pressure stabilizer on separation and regeneration,1.5% lywallzyme and 0.5%driselase as reactive synthase,enzymatic temperature 30℃, enzymatic time 3h,improved PDA as regeneration culture medium.
     With LA and LA-UV mutation from four mutant modes,average fermentation yields of screened mutant strains were 11.57±1.86mg/mL and 8.52±1.52mg/mL respectively,which were better than others,further the positive mutation rates with LA and LA-UV mutation were 6.08%and 5.52%respectively.The strains with LA-UV mutation produced larger variation and had great increasing potential,so LA-UV mutant mode was applied to large-scale screening.
     The S2 strain with UV mutation was selected,which had faster growth rate,then the protoplast of S2 strain was mutated with LA-UV,through five generation screening,five mutant strains were selected,Results showed that the five mutant strains had good genetic stability,they also had antagonism to the original strains,and the electrophoretograms of esterase and peroxidase were changed.
     The analytical methods of fermentation yield on intracellular and extracellular polysaccharide from Phellinus igniarius were established.The fermentation yields of polysaccharide from all selected strains were determined,then results showed that the fermentation yield of polysaccharide from SJZ2 strain,which were highest,increased by 36.88%than original strain.
     The culture medium of SJZ2 was screened and optimized.The results showed that the best carbon source was wheat flour,the best nitrogen source was rice bran,the optimum conditions were as follows:wheat flour 5.16%,rice bran 1.38%,KH_2PO_4 0.094%,MgSO_4 0.054%,under these conditons,the factors influencing fermentation yield were in the order as follows:rice bran content>wheat flour content>KH_2PO_4 content>MgSO_4 content,and regression model was well predictable,which had been confirmed by verification experiment.
     The single factor experiments of shaking flask that had an effect on fermentation yield were studied.The results showed that the optimum conditions were as follows: media amount 120/250(mL/mL),the inoculum size 17mL,temperature 26℃,rotate speed 135r/min,under these conditions,the factors influencing fermentation yield were in the order as follows:temperature>inoculum size>rotate speed>media amount, and the regression model was well predictable,which had been confirmed by verification experiment.
     The kinetic changes of mycelial yield,soluble protein content,polysaccharide content,viscosity,LiP,MnP,Lac,carboxymethyl cellulase and filter paper cellulase were studied in the process of shaking flask fermentation,then michaelis constant and maximum reaction speed of LiP,MnP,Lac were determined.
     Base on shaking flask fermentation,fermentor experiments were studied.The results showed that the optimum conditions of fermentation were as follows:media amount 70/100(mL/mL),inoculation volume 10%,stirring speed 180r/min, temperature 29℃,air flow 1:0.6v/v.m,under these conditions,3.5L fermentation culture medium could produce mycelium 68.23±2.51g(n=3),and extracellular polysaccharide 10.23±0.35g(n=3).
     Polysaccharides from Phellinus igniarius were extracted with compound enzymes. Different enzymes were screened and compound,The screened enzymes for extraction were cellulase,helicase,lywallzyme and neutrase(3:1:0.5:4).Base on single factor tests,extraction conditions were optimized.The results showed that the optimum conditions of polysaccharide extracting rate were as follows:pH 6.5,temperature 40.9℃,extraction time 3.78h,enzyme quantity 3.37%,the optimum conditions of polysaccharide purity were as follows:pH 6.7,temperature 34.5℃,extraction time 2.35h, enzyme quantity 2.57%,under these conditions,the factors influencing polysaccharide extracting rate were in the order as follows:pH>enzyme quantity>temperature>extraction time,factors influencing polysaccharide purity were in the order as follows: extraction time>pH>temperature>enzyme quantity,and the regression model was well predictable,which had been confirmed by verification experiment.
     The part physicochemical properties of PIPS were studied.The results showed that the reaction of I-KI reagent was negative,that ofα-naphthol reagent was positive,that of Folin's reagent was negative,inherent viscosity of EPS at 25℃was 0.85dL/g,and inherent viscosity of IPS at 25℃was 1.2dL/g.
     Through fractionation of PIPS,EPS_(0.1)and EPS_(0.2)were obtained from EPS,eight fractions were obtained from IPS such as IPS_(0.01),IPS_(0.02),IPS_(0.1)and so on,and the monosaccharide composition of PIPS and part fractions were determined.The results showed that the monosaccharide composition and molar ratio of IPS were 1(Xyl):50(Rha):33(Ara):225(Man):375(Glu),those of IPS_(0.1)were 10(Rha):33(Man):70 (Glu),those of IPS_(0.01)were 9(Man):5(Glu),those of EPS were 1(Gal):35(Man):35(Glu), those of EPS_(0.1)were 7(Man):5(Glu),and those of EPS_(0.2)were 13(Man):5(Glu).
     Antioxidative activities of polysaccharide from Phellinus igniarius showed better dose-effect relationship.Through the curvilinear regression computation,the result showed that the EC_(50)of IPS on DPPH radical scavenging capacity was 1.09mg/mL,EPS was 1.52mg/mL,the EC_(50)of IPS on hydroxyl radical scavenging capacity was 0.78mg/mL,EPS was 0.23mg/mL,the EC_(50)of IPS on Superoxide Anions scavenging capacity was 29.97μg/mL,EPS was 20.31μg/mL,the EC_(50)of IPS on Fe~(2+) Chelation was 1.36mg/mL,EPS was 1.66mg/mL,under these conditions,the reduction activity of IPS was y=1.3023x+0.0178(R~2=0.9991),EPS was y=1.8004x+0.0185 (R2=0.9992).
引文
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