CN107782827B - 一种奶酪特征风味物质分析方法及其指纹图谱 - Google Patents

一种奶酪特征风味物质分析方法及其指纹图谱 Download PDF

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CN107782827B
CN107782827B CN201711244186.5A CN201711244186A CN107782827B CN 107782827 B CN107782827 B CN 107782827B CN 201711244186 A CN201711244186 A CN 201711244186A CN 107782827 B CN107782827 B CN 107782827B
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刘娜
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Abstract

本发明涉及一种奶酪特征风味物质分析方法及其指纹图谱,该方法包括如下步骤:1)、奶酪风味物质提取方法:称取10g奶酪样品,切成小块后,加入10mL饱和氯化钠水溶液,使用搅拌器快速搅拌成匀浆状,取浆状样品置于20mL顶空瓶中,密封压盖,置于恒温箱中,40℃下平衡30min。2)、奶酪风味物质鉴定方法:热脱附‑气相色谱‑质谱联用。本发明指纹图谱能较综合、准确地反映样品的香气质量情况,依据本发明可对不同批次奶酪质量进行监测,方法简单,可操作性强,为质量评价提供快速、有效、简单的方法,同时为奶酪风味物质分析奠定了基础。

Description

一种奶酪特征风味物质分析方法及其指纹图谱
技术领域
本发明涉及一种检测分析方法,特别涉及一种奶酪特征风味物质分析方法及其指纹图谱。
背景技术
奶酪又名干酪、芝士,它是一种营养价值很高的乳制品,含有丰富的蛋白质、脂肪及全部人体必需氨基酸、维生素和矿物质等。奶酪含有如此多的营养成分,易消化吸收,不易致肥,因此被营养学家封为理想的食品,誉之为‘奶黄金’。
食品指纹图谱是指食品特有品质(如香气、元素组成、色泽等)通过特定的信息化处理后能对产品身份进行分析识别的技术,这种识别具有唯一性,可用于对产品真假的识别和产品质量优劣判别。
本发明的目的是提供一种奶酪特征风味物质分析方法及其指纹图谱,有效地推动奶酪行业的发展。
发明内容
本发明以奶酪为研究对象,采用吸附热脱附法制备待测样品风味物质,利用气相色谱-质谱联用法分析奶酪挥发性成分,并结合气相色谱-嗅闻联用法分析奶酪风味物质,从而得到奶酪特征风味物质组成。
本发明采用的技术方案为:
本发明提供了一种奶酪特征风味物质分析方法,该方法包括如下步骤:
1)、奶酪风味物质提取方法
2)、奶酪风味物质鉴定方法:热脱附-气相色谱-质谱联用
热脱附仪设置:预吹10min,脱附时间10min,冷阱捕集温度-10℃,脱附温度200℃,传输线温度100℃,加热阀温度100℃;
气相色谱条件:HP-5毛细管柱(60m×0.25mm×0.25μm),进样口温度250℃,载气为高纯(≥99.999%)氦气,载气流速为1.0mL/min,程序升温:起始温度40℃,保持2.0min,3℃/min升至180℃,再以10℃/min升至250℃保持10.0min;
质谱条件:EI离子源;电子能量70eV;四级杆温度150℃,接口温度260℃;电子倍增器电压1424V;离子源温度230℃;采用标准方式调谐;选用全扫描(SCAN)模式,质量扫描范围:40~450amu。
优选地,所述的步骤1)为:称取10g奶酪样品,切成小块后,加入10mL饱和氯化钠水溶液,使用搅拌器快速搅拌成匀浆状,取浆状样品置于20mL顶空瓶中,密封压盖,置于恒温箱中,40℃下平衡30min。
优选地,上述步骤2)还包括嗅闻条件:在气相色谱柱末端安装分流口将毛细管柱的出口进行1:1分流,一个接质谱检测器进行质谱鉴定,一个接气味检测器。(通过人的嗅觉鉴别单个成分的风味特征,单个组分进行两种检测的色谱保留时间基本一致。)
本发明还提供了一种奶酪指纹图谱的构建方法,该方法包括如下步骤:
1)、奶酪风味物质提取方法
称取10g奶酪样品,切成小块后,加入10mL饱和氯化钠水溶液,使用搅拌器快速搅拌成匀浆状,取浆状样品置于20mL顶空瓶中,密封压盖,置于恒温箱中,40℃下平衡30min;
2)、奶酪风味物质鉴定方法:热脱附-气相色谱-质谱联用
热脱附仪设置:预吹10min,脱附时间10min,冷阱捕集温度-10℃,脱附温度200℃,传输线温度100℃,加热阀温度100℃;
气相色谱条件:HP-5毛细管柱(60m×0.25mm×0.25μm),进样口温度250℃,载气为高纯(≥99.999%)氦气,载气流速为1.0mL/min,程序升温:起始温度40℃,保持2.0min,3℃/min升至180℃,再以10℃/min升至250℃保持10.0min;
质谱条件:EI离子源;电子能量70eV;四级杆温度150℃,接口温度260℃;电子倍增器电压1424V;离子源温度230℃;采用标准方式调谐;选用全扫描(SCAN)模式,质量扫描范围:35~450amu。
3)、标准指纹图谱的确定:针对市售20种合格奶酪样品进行风味物质分析,确定了7个共有特征峰,其保留时间分别为:8.308min,10.185min,10.629min,13.584min,15.946min,16.551min,22.110min,这些共有特征峰构成了奶酪的指纹特征,可作为奶酪的标准指纹图谱。
本发明所具有的优点和有益效果为:
本发明指纹图谱能较综合、准确地反映样品的香气质量情况,依据本发明可对不同批次奶酪质量进行监测,方法简单,可操作性强,为质量评价提供快速、有效、简单的方法,同时为奶酪风味物质分析奠定了基础。
附图说明
图1为本发明分析方法得到的某品牌淡味奶酪的色谱总离子流图。
具体实施方式
下面结合具体实施例对本发明作进一步说明,但不限定本发明的保护范围。
实施例1
一种奶酪特征风味物质分析方法,该方法包括如下步骤:
1)、奶酪风味物质提取方法
称取10g奶酪样品,切成小块后,加入10mL饱和氯化钠水溶液,使用搅拌器快速搅拌成匀浆状,取浆状样品置于20mL顶空瓶中,密封压盖,置于恒温箱中,40℃下平衡30min。
2)、奶酪风味物质鉴定方法:热脱附-气相色谱-质谱联用
热脱附仪设置:预吹10min,脱附时间10min,冷阱捕集温度-10℃,脱附温度200℃,传输线温度100℃,加热阀温度100℃;
气相色谱条件:HP-5毛细管柱(60m×0.25mm×0.25μm),进样口温度250℃,载气为高纯(≥99.999%)氦气,载气流速为1.0mL/min,程序升温:起始温度40℃,保持2.0min,3℃/min升至180℃,再以10℃/min升至250℃保持10.0min。
质谱条件:EI离子源;电子能量70eV;四级杆温度150℃,接口温度260℃;电子倍增器电压1424V;离子源温度230℃;采用标准方式调谐;选用全扫描(SCAN)模式,质量扫描范围:35~450amu;
嗅闻条件:在气相色谱柱末端安装分流口将毛细管柱的出口进行1:1分流,一个接质谱检测器进行质谱鉴定,一个接气味检测器,通过人的嗅觉鉴别单个成分的风味特征,单个组分进行两种检测的色谱保留时间基本一致。
由于不同品牌奶酪产品风味存在区别,因此针对某品牌淡味奶酪的10批次样品进行风味物质分析,确定了23个共有峰,这些共有特征峰构成了该品牌淡味奶酪的指纹特征,可作为该品牌淡味奶酪的标准指纹图谱。结果如下表1所示,色谱总离子流图为图1:
表1某品牌淡味奶酪风味物质鉴定表
Figure BDA0001490422170000031
Figure BDA0001490422170000041
实施例2
针对20种市售的合格奶酪样品建立的指纹图谱,通过分析比较,确定了7个共有特征峰,这些共有特征峰构成了奶酪的指纹特征,可作为奶酪的标准指纹图谱。其保留时间分别为:8.308min,10.185min,10.629min,13.584min,15.946min,16.551min,22.110min。对应的风味物质为:乙醇、己酸、乙酸乙酯、乙偶姻、1-戊醇、丁酸、2-庚酮。

Claims (1)

1.一种奶酪指纹图谱的构建方法,其特征在于:该方法包括如下步骤:
1)、奶酪风味物质提取方法
称取10g奶酪样品,切成小块后,加入10mL饱和氯化钠水溶液,使用搅拌器快速搅拌成匀浆状,取浆状样品置于20mL顶空瓶中,密封压盖,置于恒温箱中,40℃下平衡30min;
2)、奶酪风味物质鉴定方法:热脱附-气相色谱-质谱联用
热脱附仪设置:预吹10min,脱附时间10min,冷阱捕集温度-10℃,脱附温度200℃,传输线温度100℃,加热阀温度100℃;
气相色谱条件:HP-5毛细管柱,60m×0.25mm×0.25μm,进样口温度250℃,载气为≥99.999%的高纯氦气,载气流速为1.0mL/min,程序升温:起始温度40℃,保持2.0min,3℃/min升至180℃,再以10℃/min升至250℃保持10.0min;
质谱条件:EI离子源;电子能量70eV;四级杆温度150℃,接口温度260℃;电子倍增器电压1424V;离子源温度230℃;采用标准方式调谐;选用全扫描模式,质量扫描范围:35~450amu;
3)、标准指纹图谱的确定:针对市售20种合格奶酪样品进行风味物质分析,确定了7个共有特征峰,其保留时间分别为:8.308min,10.185min,10.629min,13.584min,15.946min,16.551min,22.110min,这些共有特征峰构成了奶酪的指纹特征,作为奶酪的标准指纹图谱。
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