CN112898400B - 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 PDF

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CN112898400B
CN112898400B CN202110094363.6A CN202110094363A CN112898400B CN 112898400 B CN112898400 B CN 112898400B CN 202110094363 A CN202110094363 A CN 202110094363A CN 112898400 B CN112898400 B CN 112898400B
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韩疏影
赵珂璇
蔡朔
蒋梦彤
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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,以非标记多肽定量方法、主成分分析及含量比较法,确定能够区分鹿皮胶与鹿角胶的特征肽段Pep‑1与Pep‑2,根据Pep‑1、Pep‑2与参比肽Pep‑R相的对含量限度,可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。

Description

一种可区分鹿角胶和鹿皮胶的特征肽段及其检测方法
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的特征肽段及其检测方法。
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,研究筛选出2条鹿源肽段与参比肽段的相对含量的比值,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,其特征在于,所述的特征肽为:
Pep-1:
Gly-Asp-Ala-Gly-Pro-Hyp-Gly-Pro-Ala-Gly-Pro-Ala-Gly-Pro-Hyp-Gly-Pro-Ile-Gly-Asn-Val-Gly-Ala-Hyp-Gly-Pro-Lys-Gly-Ala-Arg;
Pep-2:
Gly-Gly-Hyp-Gly-Gly-Hyp-Gly-Pro-Gln-Gly-Pro-Ala-Gly-Lys;
Pep-R:
Gly-Pro-Hyp-Gly-Pro-Met-Gly-Pro-Hyp-Gly-Leu-Ala-Gly-Pro-Hyp-Gly-Glu-Ser-Gly-Arg。
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)将上述的Pep-1和Pep-2 两个鹿源特征肽及参比肽Pep-R配成混合对照品溶液;
(2)将待检测鹿皮胶与鹿角胶的胶类样品,用胰蛋白酶进行酶切后,将酶解液和步骤(1)鹿源特征肽混合对照品溶液注入液质联用仪,以鹿源特征肽对照,采用ESI正离子模式,多反应监测模式,选择的离子对包括:Pep-1:m/z 864.7(三电荷)→568.1、m/z 864.7(三电荷)→398.3;Pep-2:m/z 583.6(双电荷)→526.8、m/z 583.6(双电荷)→342.2进行检测;Pep-R:m/z 916.9(双电荷)→772.4、m/z 916.9(双电荷)→715.3。以Pep-1峰面积A1与Pep-R峰面积AR比值或Pep-2峰面积A2与Pep-R峰面积AR比值确定样品为鹿皮胶或鹿角胶。
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:所述的酶切方法为:取待检测鹿皮胶与鹿角胶的胶类药材样品,加入磷酸盐缓冲液,超声使样品完全溶解,离心,取上清液,置于离心管中,以 PBS稀释,加入适量胰蛋白酶,摇匀,充分酶解,加入三氟乙酸溶液终止反应,离心,即得胶类药材酶解液,冷藏保存,备用。
作为更加优选方案,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10 mg,加入5 ml磷酸盐缓冲液,超声使样品完全溶解,12000 rpm离心20 min,取上清液150 μl,置于2 ml离心管中,以1 ml 50 mM 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60 μl终止反应,12000 rpm离心20 min,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 × 100 mm,上样量为2μl,流速0.3ml/min,流动相A(乙腈),流动相B(0.1%甲酸),0~3.5 min,10~30%A线性梯度洗脱,3.5~4 min,30~10%A线性梯度洗脱,4~6 min,10%A洗脱;采用三重四极杆质谱,质谱条件为:Pep-1:m/z 864.7(三电荷)→568.1;Pep-2:m/z 583.6(双电荷)→526.8;Pep-R:m/z916.9(双电荷)→772.4。
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:
Pep-1:m/z 864.7(三电荷)→568.1,DP=185.91, CE=36.97;
Pep-1:m/z 864.7(三电荷)→398.3,DP=165.95, CE=43.17;
Pep-2:m/z 583.6(双电荷)→526.8,DP=65.94, CE=26.91;
Pep-2:m/z 583.6(双电荷)→342.2,DP=66.25, CE=27.99;
Pep-R:m/z 916.9(双电荷)→772.4,DP=132.42, CE=38.60;
Pep-R:m/z 916.9(双电荷)→715.3,DP=130.46, CE=37.57。
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,鹿角胶的 A1/AR不得低于5.0,A 2/AR不得高于0.5;鹿皮胶的A1/AR不得高于1.0,A 2/AR不得低于0.8。
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,研究筛选出2条鹿源肽段与参比肽段的相对含量的比值在鹿角胶和鹿皮胶中不同,从而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LFQ肽段的散点图。
图2为Pep-1的质谱图。
图3为Pep-2的质谱图。
图4为Pep-R的质谱图。
图5为Pep-1、Pep-2在鹿皮胶(DCG)与鹿角胶(DHG)中的含量。
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NO1~NO3
Pep-1:
Gly-Asp-Ala-Gly-Pro-Hyp-Gly-Pro-Ala-Gly-Pro-Ala-Gly-Pro-Hyp-Gly-Pro-Ile-Gly-Asn-Val-Gly-Ala-Hyp-Gly-Pro-Lys-Gly-Ala-Arg
Pep-2:
Gly-Gly-Hyp-Gly-Gly-Hyp-Gly-Pro-Gln-Gly-Pro-Ala-Gly-Lys
Pep-R:
Gly-Pro-Hyp-Gly-Pro-Met-Gly-Pro-Hyp-Gly-Leu-Ala-Gly-Pro-Hyp-Gly-Glu-Ser-Gly-Arg。
实施例2 Pep-1、Pep-2、Pep-R的确定
1.鹿皮胶和鹿角胶酶解液的制备:
取5批次鹿皮胶样品和5批次鹿角胶样品,每批次各取10 mg,分别加入5 ml磷酸盐缓冲液,超声使样品完全溶解,12000 rpm离心20 min,取上清液150 μl,置于2 ml离心管中,以1 ml 50 mM PBS稀释,加入1%胰蛋白酶(w/v),摇匀,37℃恒温酶解12 h,酶解后加入10% TFA溶液60 μl终止反应,Seppak C18脱盐处理,离心浓缩干燥,以纯水复溶,测定多肽浓度,再次离心浓缩干燥,置于-20℃保存,得到5批次鹿皮胶和5批次鹿角胶的酶解样品,备用。
2、用戴安U3000 NanoRSLC纳升液相系统,色谱柱为5 μm Reprosil C18AQ(75μm× 150 mm),LC-MS/MS质谱系统分析样品。
用初始流动相复溶5批次的鹿皮胶与鹿角胶酶解样品,调整多肽浓度为1 μg/μl,上样2 μl,流速400 nL/min,流动相A(乙腈/甲酸/水=2/0.2/98,v/v/v),流动相B(乙腈/甲酸/水=80/0.2/20,v/v/v),2~30%B线性梯度洗脱120 min。Thermo Q-Exactive Orbitrap质谱仪用于进行肽段分析,喷雾电压为2.5 kV,离子传输毛细管温度为200℃;质谱一级全扫描范围为m/z 300~2000,分离宽度为3;串联质谱分析采用一级质谱数据依赖的二级质谱扫描模式,依次选取一级质谱中离子强度最高的5个离子进行碰撞诱导解离(CID)二级串联质谱,每个样品重复进样1次。采用Xcalibur(3.0.63)软件进行数据采集。
串联质谱数据用PEAKS 8.5软件进行搜库分析,选择鹿胶原蛋白数据库搜索,检索参数设置为:前体离子误差10;子离子误差1;翻译后修饰(PTM)的设置参数为:脯氨酸的羟基化(+15.99);天门冬酰胺与谷氨酰胺的脱酰胺(+0.98);允许2个位点误切,假阳性率(FDR)≤1%;选择胰蛋白酶酶切(Trypsin),在上述检索条件下所得分值有显著性意义(P <0.05)被认定为有效的鉴定结果。
Label free定量(LFQ)通过比较提取离子色谱(XIC)和PEAK Studio 8.5计算峰面积,计算相对表达水平的变化。采集的LC-MS/MS数据首先通过软件进行校准。以其中一个样品为参照,以总离子流(TIC)对每一个鉴定肽的峰面积进行归一化,对鉴定肽的相对含量进行定量分析。
将肽段的LFQ结果以Fold change(FC)取log2为横坐标,显著性差异P值取−log10为纵坐标,作散点图,取FC > 3,P < 0.01的肽段为鹿皮胶与鹿角胶中显著变化的肽段。如图1所示,Pep-1与Pep-2为离散点,即在鹿皮胶与鹿角胶中含量差异大,且可用来区分鹿皮胶与鹿角胶。Pep-1、Pep-2、Pep-R的MS/MS图分别见图2、图3和图4。
实施例3 鹿皮胶与鹿角胶A1/AR、A 2/AR的测定
取10批次鹿皮胶样品、10批次鹿角胶样品,每批次各取10 mg,加入5 ml磷酸盐缓冲液,超声使样品完全溶解,12000 rpm离心20 min,取上清液150 μl,置于2 ml离心管中,以1 ml 50 mM PBS稀释,加入1%胰蛋白酶(w/v),摇匀,37℃恒温酶解12 h,酶解后加入10%TFA溶液60 μl终止反应,12000 rpm离心20 min,即得10批次的鹿皮胶、鹿角胶酶解液,置于-20℃保存,备用。
将上述10批次的鹿皮胶和鹿角胶酶解液注入液质联用仪,进样量为1 μg,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(2.1 μm × 100 mm),流速0.3ml/min,流动相A(乙腈),流动相B(0.1%甲酸),0~3.5 min,10~30%A线性梯度洗脱,3.5~4 min,30~10%A线性梯度洗脱,4~6 min,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:
Pep-1:m/z 864.7(三电荷)→568.1,DP=185.91, CE=36.97;
Pep-2:m/z 583.6(双电荷)→526.8,DP=65.94, CE=26.91;
Pep-R:m/z 916.9(双电荷)→772.4,DP=132.42, CE=38.60。
10个批次鹿皮胶、鹿角胶A1/AR、A 2/AR数值见表1和图5,鹿皮胶的A1/AR、A 2/AR平均值分别为0.53±0.09、1.33±0.34,鹿角胶的A1/AR、A 2/AR平均值分别为7.48±2.12、0.21±0.09。
根据结果规定:鹿角胶的 A1/AR不得低于5.0,A 2/AR不得高于0.5,鹿皮胶的A1/AR不得高于1.0,A 2/AR不得低于0.8。
表1 鹿皮胶、鹿角胶的A1/AR、A 2/AR结果
Figure DEST_PATH_IMAGE002
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<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
<160> 3
<170> SIPOSequenceListing 1.0
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<211> 30
<212> PRT
<213> 人工序列(2 Ambystoma laterale x Ambystoma jeffersonianum)
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Gly Asp Ala Gly Pro Pro Gly Pro Ala Gly Pro Ala Gly Pro Pro Gly
1 5 10 15
Pro Ile Gly Asn Val Gly Ala Pro Gly Pro Lys Gly Ala Arg
20 25 30
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<212> PRT
<213> 人工序列(2 Ambystoma laterale x Ambystoma jeffersonianum)
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Gly Gly Pro Gly Gly Pro Gly Pro Gln Gly Pro Ala Gly Lys
1 5 10
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<213> 人工序列(2 Ambystoma laterale x Ambystoma jeffersonianum)
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Gly Pro Pro Gly Pro Met Gly Pro Pro Gly Leu Ala Gly Pro Pro Gly
1 5 10 15
Glu Ser Gly Arg
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Claims (4)

1.一种可区分鹿角胶和鹿皮胶的检测方法,其特征在于,包括以下步骤:
(1)可区分鹿角胶和鹿皮胶的特征肽段为:
Pep-1:
Gly-Asp-Ala-Gly-Pro-Hyp-Gly-Pro-Ala-Gly-Pro-Ala-Gly-Pro-Hyp-Gly-Pro-Ile-Gly-Asn-Val-Gly-Ala-Hyp-Gly-Pro-Lys-Gly-Ala-Arg
Pep-2:
Gly-Gly-Hyp-Gly-Gly-Hyp-Gly-Pro-Gln-Gly-Pro-Ala-Gly-Lys
参比肽Pep-R:
Gly-Pro-Hyp-Gly-Pro-Met-Gly-Pro-Hyp-Gly-Leu-Ala-Gly-Pro-Hyp-Gly-Glu-Ser-Gly-Arg;
将特征肽段Pep-1、Pep-2及参比肽Pep-R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)混合对照品溶液注入液质联用仪,以Pep-1和Pep-2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:Pep-1:m/z 864.7三电荷→568.1、m/z 864.7三电荷→398.3;Pep-2:m/z 583.6双电荷→526.8、m/z 583.6双电荷→342.2进行检测;Pep-R:m/z 916.9双电荷→772.4、m/z 916.9双电荷→715.3;以Pep-1峰面积A1与Pep-R峰面积AR比值或Pep-2峰面积A2与Pep-R峰面积AR比值确定样品为鹿皮胶或鹿角胶;鹿角胶的 A1/AR不得低于5.0,A 2/AR不得高于0.5,鹿皮胶的A1/AR不得高于1.0,A 2/AR不得低于0.8;
所述的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 ×100 mm,上样量为2μl,流动相A为乙腈,流动相B为0.1%甲酸,流速0.3ml/min,0~3.5 min,10~30%A线性梯度洗脱,3.5~4 min,30~10%A线性梯度洗脱,4~6 min,10%A洗脱。
2.根据权利要求1所述的可区分鹿角胶和鹿皮胶的检测方法,其特征在于,所述的酶切方法为:取待检测鹿皮胶与鹿角胶样品,加入磷酸盐缓冲液,超声使样品完全溶解,离心,取上清液,置于离心管中,以 PBS稀释,加入适量胰蛋白酶,摇匀,充分酶解,加入三氟乙酸溶液终止反应,离心,即得酶解液,冷藏保存,备用。
3.根据权利要求2所述的可区分鹿角胶和鹿皮胶的检测方法,其特征在于,加入胰蛋白酶的质量浓度为0.1%~10%。
4.根据权利要求2所述的可区分鹿角胶和鹿皮胶的检测方法,其特征在于,酶解方式包括:37℃恒温酶解、微波辅助酶解、超声辅助酶解或酶固定化酶解。
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