CN105424659B - 利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法及该检测体系 - Google Patents

利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法及该检测体系 Download PDF

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CN105424659B
CN105424659B CN201510729411.9A CN201510729411A CN105424659B CN 105424659 B CN105424659 B CN 105424659B CN 201510729411 A CN201510729411 A CN 201510729411A CN 105424659 B CN105424659 B CN 105424659B
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rhodamine
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廖娟
刘北忠
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Yongchuan Hospital of Chongqing Medical University
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    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N21/62Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
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    • G01N21/6428Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • G01N21/643Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" non-biological material
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    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N21/62Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64Fluorescence; Phosphorescence
    • G01N21/6428Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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Abstract

本发明公开了利用氧化石墨烯‑罗丹明‑尿酸酶混合溶液检测尿酸的方法,该方法以氧化石墨烯‑罗丹明‑尿酸酶混合溶液为基液,利用荧光猝灭原理检测法检测尿酸含量,其中氧化石墨烯、罗丹明、尿酸酶的质量比为20:1:1.5。本发明检测灵敏度高,大幅提高了检测的可靠度。

Description

利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法及 该检测体系
技术领域
本发明涉及化学物质定量检测领域,具体涉及测量尿酸含量的方法,特别涉及利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法及该检测体系。
背景技术
目前已报道的尿酸检测方法主要分成两大类,即色谱分析方法和化学分析方法。色谱法选择性高,可靠性好,但不适合常规检测,尤其不适合定期随时检测。化学分析方法又分两种,一是利用尿酸的还原性反应进行检测,其选择性低而很少使用;另一种是利用尿酸酶高专一性反应进行检测,其选择性显著优于利用尿酸还原反应的方法,尿酸在尿酸酶作用下生成尿囊素、H2O2和CO2。酶法分因此分为直接法和间接法,直接法是直接跟踪尿酸酶作用下尿酸紫外吸收下降的测定方法,间接法是测定尿酸氧化产物H2O2的含量。
然而,普通尿酸检测方法存在灵敏度较低,测量过程复杂的缺陷,有必要进行改性。
发明内容
有鉴于此,本发明提供了利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法及该检测体系。
利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法。
优选的,以氧化石墨烯-罗丹明-尿酸酶混合溶液为基液,利用荧光猝灭原理检测法检测尿酸含量。
优选的,氧化石墨烯、罗丹明、尿酸酶的质量比为18~22:0.9~1.1:1.4~1.6。
优选的,将待测试样加入氧化石墨烯-罗丹明-尿酸酶混合溶液并放置10分钟以上,然后利用荧光猝灭原理检测法检测尿酸含量。
优选的,激发波长为480-500nm。
本发明还提供尿酸检测体系,该体系为含有氧化石墨烯、罗丹明和尿酸酶的混合溶液。
进一步,所述混合溶液中氧化石墨烯、罗丹明、尿酸酶的质量比为18~22:0.9~1.1:1.4~1.6。
特别的,所述混合溶液中氧化石墨烯、罗丹明、尿酸酶的浓度分别为18-22mg/L、0.9-1.1mg/L、1.4-1.6mg/L。
本发明的有益效果在于:
本发明检测灵敏度高,大幅提高了检测的可靠度,另外本发明检测体系较为便宜,有助于降低检测成本。氧化石墨烯对罗丹明123有荧光猝灭作用,在一定范围内,氧化石墨烯浓度增加,罗丹明123的荧光猝灭强度线性下降,但随着氧化石墨烯浓度增加,猝灭强度趋于不变。分别测定T=283、298、310K下,测定Stern-Volmer曲线。每个温度下Stern-Volmer曲线是一条直线,说明氧化石墨烯与罗丹明123形成复合物,其猝灭机制属于静态猝灭,即氧化石墨烯与罗丹明123形成新的复合物而导致罗丹明123的荧光猝灭。
附图说明
为了使本发明的目的、技术方案和优点更加清楚,下面将结合附图对本发明作进一步的详细描述,其中:
图1为实施例1不同浓度尿酸500~600nm波长下的荧光强度;
图2为实施例1不同浓度尿酸最大发射的荧光强度;
图3为实施例2光吸收随时间变化图;
图4为实施例3最大发射峰荧光强度强度随时间变化图。
具体实施方式
以下将参照附图,对本发明的优选实施例进行详细的描述。
实施例1:
本实施例的尿酸检测体系含为含有氧化石墨烯、罗丹明123和尿酸酶的混合溶液,其中氧化石墨烯终浓度为20mg/L,罗丹明123终浓度为3nM,尿酸酶终浓度为1.5mg/L。
本实施例检测尿酸的方法,首先将尿酸加入混合溶液中(尿酸的中浓度分别为0.07mM,0.10mM,0.15mM,0.20mM,0.24mM),然后在500nm激发,扫描500~600nm波长下的体系的荧光强度。结果如图1所示,由图1可见,最大发射峰为520nm。以尿酸浓度为横轴,最大发射峰520nm波长下的荧光强度为纵轴得图2,由图2可知,随着体系中尿酸浓度增加,体系的荧光强度线性降低。
实施例2:
本实施例的尿酸检测体系中氧化石墨烯终浓度为20mg/L,罗丹明123终浓度为3nM,尿酸酶终浓度为1.5mg/L。
检测时,首先向检测体系加入尿酸(终浓度为1.5mg/L),然后在293nm激发,每间隔2.0min测定一次光吸收变化得图3,由图3可知2~12min内的吸光度与时间为线性相关。据此据算酶活性(每分钟消耗1mM/μM尿酸的酶量为1单位)为0.21单位,在15min后,尿酸基本被尿酸酶氧化,因此在荧光体系中加入尿酸后,放置15min后检测。采用初速度法测定酶活性,在25℃用0.075mmol/L尿酸在pH 9.2硼酸盐缓沖液中在全自动酶标仪上测定293nm光吸收变化的初速度表示尿酸酶活性,按其摩尔消光系数11.5(mmol/L)-1·cm-1校正尿酸储备液的浓度[10]。尿酸溶液每天配制,使用前在(25±0.5)℃下预热20min。尿酸酶反应体系共150μL,含尿酸溶液50μL,加入用50.0mmol/L的硼酸缓冲液(pH 9.2)稀释的裂解液100μL启动反应,间隔2.0或5.0min测定293nm光吸收变化,每份样品测定3次。用各突变体酶活性与其总蛋白浓度之比表示比活性。每分钟消耗1微摩尔尿酸的酶量为1单位。
实施例3
本实施例的尿酸检测体系中氧化石墨烯终浓度为20mg/L,罗丹明123终浓度为3nM,尿酸酶终浓度为1.5mg/L。
检测时,首先向检测体系加入尿酸(终浓度为1.5mg/L),然后在500nm激发,扫描500~600nm波长下的体系的荧光强度,以体系在520nm的荧光强度为纵轴,反应时间为横轴得图4,由图4可知,结果表明随着时间增加,该波长下的荧光强度逐渐增强,但在15min后,该波长下的荧光强度变化较小。因此,在氧化石墨烯-罗丹明-尿酸酶检测体系中,加入尿酸,放置15min后检测。
由此可见,本发明检测灵敏度高,大幅提高了检测的可靠度。
最后说明的是,以上实施例仅用以说明本发明的技术方案而非限制,尽管通过参照本发明的优选实施例已经对本发明进行了描述,但本领域的普通技术人员应当理解,可以在形式上和细节上对其作出各种各样的改变,而不偏离所附权利要求书所限定的本发明的精神和范围。

Claims (5)

1.利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法,以氧化石墨烯-罗丹明-尿酸酶混合溶液为基液,利用荧光猝灭原理检测法检测尿酸含量,其中氧化石墨烯、罗丹明、尿酸酶的质量比为18~22:0.9~1.1:1.4~1.6。
2.根据权利要求1所述利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法,其特征在于:将待测试样加入氧化石墨烯-罗丹明-尿酸酶混合溶液并放置10分钟以上,然后利用荧光猝灭原理检测法检测尿酸含量。
3.根据权利要求1所述利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法,其特征在于:激发波长为480-500nm。
4.氧化石墨烯-罗丹明-尿酸酶尿酸检测体系,其特征在于:氧化石墨烯、罗丹明、尿酸酶的质量比为18~22:0.9~1.1:1.4~1.6。
5.根据权利要求4所述氧化石墨烯-罗丹明-尿酸酶尿酸检测体系,其特征在于:所述氧化石墨烯、罗丹明、尿酸酶的浓度分别为18-22mg/L、0.9-1.1mg/L、1.4-1.6mg/L。
CN201510729411.9A 2015-10-30 2015-10-30 利用氧化石墨烯-罗丹明-尿酸酶混合溶液检测尿酸的方法及该检测体系 Expired - Fee Related CN105424659B (zh)

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