CN112098578B - 一种可区分鹿角胶和鹿皮胶的特征肽段及其检测方法 - Google Patents
一种可区分鹿角胶和鹿皮胶的特征肽段及其检测方法 Download PDFInfo
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Abstract
本发明公开了一种可区分鹿皮胶与鹿角胶的特征肽段及其检测方法,本发明通过大量实验筛选,以鹿角胶在混合胶中占比为横坐标,以A肽1/A肽3、A肽2/A肽3数值为纵坐标作图,鹿角胶占比与A肽1/A肽3呈线性,建立标准曲线方程为y=1.034x+0.0157,R²=0.9908;鹿角胶占比与A肽2/A肽3也呈线性,建立标准曲线方程为y=0.7883x+0.0949,R²=0.9905;鹿角胶掺入比例与A肽1/A肽3、A肽2/A肽3数值相关,根据A肽1/A肽3、A肽2/A肽3的比值确定鹿角胶与鹿皮胶混合比例。该方法专属性强、灵敏度高、操作简单,可用于鹿皮胶与鹿角胶的区分及质量控制。
Description
技术领域
本发明涉及一种鹿源特征肽段及其检测方法,具体涉及区分鹿皮胶与鹿角胶,以及鹿角胶中掺有鹿皮胶的样品、掺入鹿皮胶的比例的特征肽段和检测方法。
技术背景
胶类药材包括阿胶、鹿皮胶、鹿角胶、黄明胶等,80%以上的成分为不同类别的胶原蛋白,包括I型胶原α1链(COL1A1)、I型胶原α2链(COL1A2)、II型胶原α1链(COL2A1)、III型胶原α1链(COL3A1)等,其中以COL1A2来源的肽段为主。COL1A2作为高保守蛋白质,广泛存在于不同动物种体内,是构成胶类药材的重要蛋白类成分之一。
鹿角胶与鹿皮胶均来源于梅花鹿或马鹿,两者为名贵胶类中药材,鹿角胶为梅花鹿或马鹿角经水煎煮、浓缩制成的固体胶,鹿皮胶为梅花鹿或马鹿的干燥皮或鲜皮经煎煮、浓缩制成的固体胶。鹿角为马鹿或梅花鹿已骨化的角,价格远高于鹿皮,市场上存在以鹿皮胶掺入鹿角胶以次充好的现象。如何将鹿皮胶与鹿角胶进行区分,着实是胶类药材鉴定研究的难题,给鹿角胶与鹿皮胶鉴别,以及鹿角胶掺入鹿皮胶的伪品鉴别都带来了挑战。
鹿角胶与鹿皮胶从外观上难以区分,且两者均来源于梅花鹿或马鹿,其蛋白质组成相同,因此,通过寻找专属性肽段来区分两者基本不可能。
发明内容
发明目的:本发明通过大量是实验筛选,研究确定3条鹿源肽段相对含量的比值,从而用来区分鹿皮胶与鹿角胶。该方法专属性强、灵敏度高、操作简单,可用于鹿皮胶与鹿角胶的区分及质量控制。
为实现上述目的,本发明采用如下技术方案:
一种可区分鹿角胶和鹿皮胶的特征肽段,所述的特征肽段由如下所述的肽1-3组成,其中,肽1:
Gly-Ser-Asp-Gly-Ser-Val-Gly-Pro-Val-Gly-Pro-Ala-Gly-Pro-Ile-Gly-Ser-Ala-Gly-Pro-Hyp-Gly-Phe-Hyp-Gly-Ala-Hyp-Gly-Pro-Lys
肽2:
Gly-Ser-Asp-Gly-Ser-Val-Gly-Pro-Val-Gly-Pro-Ala-Gly-Pro-Ile-Gly-Ser-Ala-Gly-Pro-Hyp-Gly-Phe-Pro-Gly-Ala-Hyp-Gly-Pro-Lys
肽3:
Gly-Asp-Asp-Gly-Ala-Thr-Gly-Ala-Ala-Gly-Pro-Hyp-Gly-Pro-Thr-Gly-Pro-Ala-Gly-Pro-Hyp-Gly-Phe-Pro-Gly-Ala-Val-Gly-Ala-Lys。
一种可区分鹿角胶和鹿皮胶的特征肽段的检测方法,其特征在于,包括以下步骤:
(1)将特征肽段配成混合对照品溶液;
(2)将待检测鹿皮胶与鹿角胶样品,用胰蛋白酶进行酶切后,将酶解液和步骤(1)特征肽段混合对照品溶液注入液质联用仪,以特征肽段对照,采用ESI正离子模式,多反应监测模式,选择的离子对包括:肽1:m/z 864.0(三电荷)→535.4、肽2:m/z 858.7(三电荷)→527.4进行检测、肽3:m/z 845.4(三电荷)→507.4进行检测;以肽1峰面积A肽1与肽3峰面积A肽3的比值或肽2峰面积A肽2与肽3峰面积A肽3的比值确定样品为鹿皮胶或是鹿角胶。
作为优选方案,以上所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,所述的酶切方法为:取待检测胶类药材样品10mg,加入5ml磷酸盐缓冲液,超声使样品完全溶解,12000rpm离心20min,取上清液150μl,置于2ml离心管中,以1ml 50mM PBS稀释,加入适量胰蛋白酶,摇匀,充分酶解,加入10%三氟乙酸溶液60μl终止反应,12000rpm离心20min,即得胶类药材酶解液,置于-20℃保存,备用。
作为优选方案,以上所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,加入胰蛋白酶的质量浓度为0.1%~10%。
作为优选方案,以上所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,酶解方式包括:37℃恒温酶解、微波辅助酶解、超声辅助酶解、酶固定化酶解。
作为优选方案,以上所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,液质联用仪检测的液相条件为:色谱柱为1.7μm Waters C18柱,规格为2.1μm×100mm,上样量为2μl,流速0.3ml/min,0~3.5min,10~30%A线性梯度洗脱,3.5~4min,30~10%A线性梯度洗脱,4~6min,10%A洗脱;采用三重四极杆质谱,质谱条件为:m/z 864.0(三电荷)→535.4、m/z 858.7(三电荷)→527.4、m/z 845.4(三电荷)→507.4。
本发明所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,其特征在于,鹿角胶的A肽1/A肽3不得低于1.0,A肽2/A肽3不得低于0.5,鹿皮胶的A肽1/A肽3不得高于0.2,A肽2/A肽3不得高于0.5。
作为优选方案,以上所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,鹿皮胶与鹿角胶所含比例检测的标准曲线方程的建立:
将鹿角胶与鹿皮胶按0%,10%,20%,30%,40%,50%,60%,70%,80%,90%,100%的比例混合,将每批次混胶样品各取10mg,加入5ml磷酸盐缓冲液,超声使样品完全溶解,12000rpm离心20min,取上清液150μl,置于2ml离心管中,以1ml 50mM PBS稀释,加入质量浓度为1%胰蛋白酶,摇匀,微波酶解30min,酶解后加入10%三氟乙酸溶液60μl终止反应,12000rpm离心20min,即得不同比例混胶样品酶解液,置于-20℃保存,备用;
将不同比例混胶样品酶解液注入液质联用仪,进样量为1μg,液质联用仪检测的液相条件为:色谱柱为1.7μm C18反相色谱柱,规格2.1μm×100mm,流速0.3ml/min,流动相A为乙腈,流动相B为0.1%甲酸,0~3.5min,10~30%A线性梯度洗脱,3.5~4min,30~10%A线性梯度洗脱,4~6min,10%A洗脱;
液质联用仪检测的质谱条件为:电喷雾正离子模式ESI+,质谱参数为:离子源温度500℃;电离电压5500V;脱溶剂温度500℃;离子源气体1,60psi;离子源气体2,60psi;
设置特征肽段对应的离子对条件如下:
肽1:m/z 864.0(三电荷)→535.4,DP=166.57,CE=33.95;
肽2:m/z 858.7(三电荷)→527.4,DP=160.35,CE=35.65;
肽3:m/z 845.4(三电荷)→507.4,DP=143.27,CE=31.50。
以鹿角胶在混合胶中占比为横坐标,以A肽1/A肽3、A肽2/A肽3数值为纵坐标作图,鹿角胶占比与A肽1/A肽3呈线性,建立标准曲线方程为y=1.034x+0.0157,R2=0.9908;鹿角胶占比与A肽2/A肽3也呈线性,建立标准曲线方程为y=0.7883x+0.0949,R2=0.9905;鹿角胶掺入比例与A肽1/A肽3、A肽2/A肽3数值相关,根据A肽1/A肽3、A肽2/A肽3的值确定鹿角胶与鹿皮胶混合比例。
有益效果:本发明相比现有技术具有以下优点:
本发明通过大量是实验筛选,研究确定3条鹿源肽段相对含量的比值,并建立的线性方程,从而用来区分鹿皮胶与鹿角胶。该方法专属性强、灵敏度高、操作简单,可用于鹿皮胶与鹿角胶的区分及质量控制。从而可以克服现有技术中,鹿角胶与鹿皮胶从外观上难以区分,专属性肽段也难以区分的不足,取得了非常好的技术进步。
附图说明
图1为鹿角胶在混合胶中占比与A肽1/A肽3、A肽2/A肽3数值关系。
图2为肽1的质谱图。
图3为肽2的质谱图。
图4为肽3的质谱图。
具体实施例
下面结合具体实施例对本发明作进一步阐述,但这些实施例不应解释为限制本发明。
实施例1
一种鹿源特征肽,所述的特征肽序列有3个,如序列表1:
肽1:
Gly-Ser-Asp-Gly-Ser-Val-Gly-Pro-Val-Gly-Pro-Ala-Gly-Pro-Ile-Gly-Ser-Ala-Gly-Pro-Hyp-Gly-Phe-Hyp-Gly-Ala-Hyp-Gly-Pro-Lys;
肽2:
Gly-Ser-Asp-Gly-Ser-Val-Gly-Pro-Val-Gly-Pro-Ala-Gly-Pro-Ile-Gly-Ser-Ala-Gly-Pro-Hyp-Gly-Phe-Pro-Gly-Ala-Hyp-Gly-Pro-Lys;
肽3:
Gly-Asp-Asp-Gly-Ala-Thr-Gly-Ala-Ala-Gly-Pro-Hyp-Gly-Pro-Thr-Gly-Pro-Ala-Gly-Pro-Hyp-Gly-Phe-Pro-Gly-Ala-Val-Gly-Ala-Lys。
实施例2鹿皮胶A肽1/A肽3、A肽2/A肽3的测定
取10个批次市售鹿皮胶样品,每批次各取10mg,加入5ml磷酸盐缓冲液,超声使样品完全溶解,12000rpm离心20min,取上清液150μl,置于2ml离心管中,以1ml 50mM PBS稀释,加入1%胰蛋白酶(w/v),摇匀,37℃恒温酶解12h,酶解后加入10%TFA溶液60μl终止反应,12000rpm离心20min,即得鹿皮胶药材酶解液,置于-20℃保存,备用。
将上述10批次的鹿皮胶酶解液注入液质联用仪,进样量为1μg,液质联用仪检测的液相条件为:色谱柱为1.7μm C18反相色谱柱(2.1μm×100mm),流速0.3ml/min,流动相A(乙腈),流动相B(0.1%甲酸),0~3.5min,10~30%A线性梯度洗脱,3.5~4min,30~10%A线性梯度洗脱,4~6min,10%A洗脱。液质联用仪检测的质谱条件为:电喷雾正离子模式(ESI+),质谱参数为:离子源温度500℃;电离电压5500V;脱溶剂温度500℃;离子源气体1,60psi;离子源气体2,60psi。设置特征肽对应的离子对条件如下:
肽1:m/z 864.0(三电荷)→535.4,DP=166.57,CE=33.95;
肽2:m/z 858.7(三电荷)→527.4,DP=160.35,CE=35.65;
肽3:m/z 845.4(三电荷)→507.4,DP=143.27,CE=31.50。
10个批次鹿皮胶A肽1/A肽3、A肽2/A肽3数值见表1,A肽1/A肽3平均值为0.085±0.039,A肽2/A肽3平均值为0.186±0.099。
表1鹿皮胶A肽1/A肽3、A肽2/A肽3结果
实施例3鹿角胶A肽1/A肽3、A肽2/A肽3的测定
取10个批次鹿角样品,按照2020版《中国药典》制备鹿角胶方法,获得鹿角胶样品,每批次各取约10mg,加入5ml磷酸盐缓冲液,超声使样品完全溶解,12000rpm离心20min,取上清液150μl,置于2ml离心管中,以1ml 50mM PBS稀释,加入1%胰蛋白酶(w/v),摇匀,超声酶解10min,酶解后加入10%TFA溶液60μl终止反应,12000rpm离心20min,即得鹿角胶酶解液,置于-20℃保存,备用。
将10个批次的鹿角胶酶解液注入液质联用仪,进样量为1μg,液质联用仪检测的液相条件为:色谱柱为1.7μm C18反相色谱柱(2.1μm×100mm),流速0.3ml/min,流动相A(乙腈),流动相B(0.1%甲酸),0~3.5min,10~30%A线性梯度洗脱,3.5~4min,30~10%A线性梯度洗脱,4~6min,10%A洗脱。液质联用仪检测的质谱条件为:电喷雾正离子模式(ESI+),质谱参数为:离子源温度500℃;电离电压5500V;脱溶剂温度500℃;离子源气体1,60psi;离子源气体2,60psi。设置特征肽对应的离子对条件如下:
肽1:m/z 864.0(三电荷)→535.4,DP=166.57,CE=33.95;
肽2:m/z 858.7(三电荷)→527.4,DP=160.35,CE=35.65;
肽3:m/z 845.4(三电荷)→507.4,DP=143.27,CE=31.50。
10个批次鹿角胶A肽1/A肽3、A肽2/A肽3数值见表2,A肽1/A肽3平均值为1.659±0.453,A肽2/A肽3平均值为0.898±0.167。
表2鹿角胶A肽1/A肽3、A肽2/A肽3结果
实施例4不同比例鹿皮胶与鹿角胶混合样品中A肽1/A肽3、A肽2/A肽3的测定
将鹿角胶与鹿皮胶按0%,10%,20%,30%,40%,50%,60%,70%,80%,90%,100%的比例混合,将每批次混胶样品各取10mg,加入5ml磷酸盐缓冲液,超声使样品完全溶解,12000rpm离心20min,取上清液150μl,置于2ml离心管中,以1ml 50mM PBS稀释,加入1%胰蛋白酶(w/v),摇匀,微波酶解30min,酶解后加入10%TFA溶液60μl终止反应,12000rpm离心20min,即得不同比例混胶样品酶解液,置于-20℃保存,备用。
将不同比例混胶样品酶解液依次注入液质联用仪,进样量为1μg,液质联用仪检测的液相条件为:色谱柱为1.7μm C18反相色谱柱(2.1μm×100mm),流速0.3ml/min,流动相A(乙腈),流动相B(0.1%甲酸),0~3.5min,10~30%A线性梯度洗脱,3.5~4min,30~10%A线性梯度洗脱,4~6min,10%A洗脱。
液质联用仪检测的质谱条件为:电喷雾正离子模式(ESI+),质谱参数为:离子源温度500℃;电离电压5500V;脱溶剂温度500℃;离子源气体1,60psi;离子源气体2,60psi。设置特征肽对应的离子对条件如下:
肽1:m/z 864.0(三电荷)→535.4,DP=166.57,CE=33.95;
肽2:m/z 858.7(三电荷)→527.4,DP=160.35,CE=35.65;
肽3:m/z 845.4(三电荷)→507.4,DP=143.27,CE=31.50。
不同比例混胶样品的A肽1/A肽3、A肽2/A肽3数值见表3,鹿角胶在混合胶中占比与A肽1/A肽3、A肽2/A肽3数值关系如图1所示。以鹿角胶在混合胶中占比为横坐标,以A肽1/A肽3、A肽2/A肽3数值为纵坐标作图,鹿角胶占比与A肽1/A肽3呈线性,y=1.034x+0.0157,R2=0.9908;鹿角胶占比与A肽2/A肽3也呈线性,y=0.7883x+0.0949,R2=0.9905。表明鹿角胶掺入比例与A肽1/A肽3、A肽2/A肽3数值相关,因此可根据A肽1/A肽3、A肽2/A肽3的比值确定鹿角胶与鹿皮胶混合比例。
表3鹿角胶/鹿皮胶混合样品掺入比例与峰面积关系
序列表
<110> 南京中医药大学
<120> 一种可区分鹿角胶和鹿皮胶的特征肽段及其检测方法
<141> 2020-09-01
<160> 3
<170> SIPOSequenceListing 1.0
<210> 1
<211> 30
<212> PRT
<213> 人工序列(Artificial Sequence)
<400> 1
Gly Ser Asp Gly Ser Val Gly Pro Val Gly Pro Ala Gly Pro Ile Gly
1 5 10 15
Ser Ala Gly Pro Xaa Gly Phe Xaa Gly Ala Xaa Gly Pro Lys
20 25 30
<210> 2
<211> 30
<212> PRT
<213> 人工序列(Artificial Sequence)
<400> 2
Gly Ser Asp Gly Ser Val Gly Pro Val Gly Pro Ala Gly Pro Ile Gly
1 5 10 15
Ser Ala Gly Pro Xaa Gly Phe Pro Gly Ala Xaa Gly Pro Lys
20 25 30
<210> 3
<211> 30
<212> PRT
<213> 人工序列(Artificial Sequence)
<400> 3
Gly Asp Asp Gly Ala Thr Gly Ala Ala Gly Pro Xaa Gly Pro Thr Gly
1 5 10 15
Pro Ala Gly Pro Xaa Gly Phe Pro Gly Ala Val Gly Ala Lys
20 25 30
Claims (6)
1.一种可区分鹿角胶和鹿皮胶的特征肽段,其特征在于,所述的特征肽段由如下所述的肽1-3组成,其中,
肽1:
Gly-Ser-Asp-Gly-Ser-Val-Gly-Pro-Val-Gly-Pro-Ala-Gly-Pro-Ile-Gly-Ser-Ala-Gly-Pro-Hyp-Gly-Phe-Hyp-Gly-Ala-Hyp-Gly-Pro-Lys
肽2:
Gly-Ser-Asp-Gly-Ser-Val-Gly-Pro-Val-Gly-Pro-Ala-Gly-Pro-Ile-Gly-Ser-Ala-Gly-Pro-Hyp-Gly-Phe-Pro-Gly-Ala-Hyp-Gly-Pro-Lys
肽3:
Gly-Asp-Asp-Gly-Ala-Thr-Gly-Ala-Ala-Gly-Pro-Hyp-Gly-Pro-Thr-Gly-Pro-Ala-Gly-Pro-Hyp-Gly-Phe-Pro-Gly-Ala-Val-Gly-Ala-Lys。
2.一种可区分鹿角胶和鹿皮胶的特征肽段的检测方法,其特征在于,包括以下步骤:
(1)将权利要求1中所述的特征肽段配成混合对照品溶液;
(2)将待检测鹿皮胶与鹿角胶样品,用胰蛋白酶进行酶切后,将酶解液和步骤(1)特征肽段混合对照品溶液注入液质联用仪,液质联用仪检测的液相条件为:色谱柱为1.7μm C18反相色谱柱,规格2.1μm×100mm,流速0.3ml/min,流动相A为乙腈,流动相B为0.1%甲酸,0~3.5min,10~30%A线性梯度洗脱,3.5~4min,30~10%A线性梯度洗脱,4~6min,10%A洗脱;以特征肽段对照,采用ESI正离子模式,多反应监测模式,选择的离子对包括:肽1:m/z864.0三电荷→535.4、肽2:m/z 858.7三电荷→527.4进行检测、肽3:m/z 845.4三电荷→507.4进行检测;
以肽1峰面积A肽1与肽3峰面积A肽3的比值或肽2峰面积A肽2与肽3峰面积A肽3的比值确定样品为鹿皮胶或是鹿角胶;鹿角胶的A肽1/A肽3不得低于1.0,A 肽2/A肽3不得低于0.5,鹿皮胶的A肽1/A肽3不得高于0.2,A肽2/A肽3不得高于0.5。
3.根据权利要求2所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,其特征在于,所述的酶切方法为:取待检测胶类药材样品10mg,加入5ml磷酸盐缓冲液,超声使样品完全溶解,12000rpm离心20min,取上清液150μl,置于2ml离心管中,以1ml 50mM PBS稀释,加入适量胰蛋白酶,摇匀,充分酶解,加入10%三氟乙酸溶液60μl终止反应,12000rpm离心20min,即得胶类药材酶解液,置于-20℃保存,备用。
4.根据权利要求3所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,其特征在于,加入胰蛋白酶的质量浓度为0.1%~10%。
5.根据权利要求3所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,其特征在于,酶解方式包括:37℃恒温酶解、微波辅助酶解、超声辅助酶解、酶固定化酶解。
6.根据权利要求2所述的可区分鹿角胶和鹿皮胶的特征肽段的检测方法,其特征在于,鹿皮胶与鹿角胶所含比例检测的标准曲线方程的建立:
将鹿角胶与鹿皮胶按0%,10%,20%,30%,40%,50%,60%,70%,80%,90%,100%的比例混合,将每批次混胶样品各取10mg,加入5ml磷酸盐缓冲液,超声使样品完全溶解,12000rpm离心20min,取上清液150μl,置于2ml离心管中,以1ml 50mM PBS稀释,加入质量浓度为1%胰蛋白酶,摇匀,微波酶解30min,酶解后加入10%三氟乙酸溶液60μl终止反应,12000rpm离心20min,即得不同比例混胶样品酶解液,置于-20℃保存,备用;
将不同比例混胶样品酶解液注入液质联用仪,进样量为1μg,液质联用仪检测的液相条件为:色谱柱为1.7μm C18反相色谱柱,规格2.1μm×100mm,流速0.3ml/min,流动相A为乙腈,流动相B为0.1%甲酸,0~3.5min,10~30%A线性梯度洗脱,3.5~4min,30~10%A线性梯度洗脱,4~6min,10%A洗脱;
液质联用仪检测的质谱条件为:电喷雾正离子模式ESI+,质谱参数为:离子源温度500℃;电离电压5500V;脱溶剂温度500℃;离子源气体1,60psi;离子源气体2,60psi;
设置特征肽段对应的离子对条件如下:
肽1:m/z 864.0三电荷→535.4,DP=166.57,CE=33.95;
肽2:m/z 858.7三电荷→527.4,DP=160.35,CE=35.65;
肽3:m/z 845.4三电荷→507.4,DP=143.27,CE=31.50;
以鹿角胶在混合胶中占比为横坐标,以A肽1/A肽3、A肽2/A肽3数值为纵坐标作图,鹿角胶占比与A肽1/A肽3呈线性,建立标准曲线方程为y=1.034x+0.0157,R2=0.9908;鹿角胶占比与A肽2/A肽3也呈线性,建立标准曲线方程为y=0.7883x+0.0949,R2=0.9905;鹿角胶掺入比例与A肽1/A肽3、A肽2/A肽3数值相关,根据A肽1/A肽3、A肽2/A肽3的值确定鹿角胶与鹿皮胶混合比例。
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