CN1766600A - 微型微生素c传感器及其制作方法 - Google Patents
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 title claims abstract description 68
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229930003268 Vitamin C Natural products 0.000 title claims abstract description 33
- 235000019154 vitamin C Nutrition 0.000 title claims abstract description 33
- 239000011718 vitamin C Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010936 titanium Substances 0.000 claims abstract description 18
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 18
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- 229940099596 manganese sulfate Drugs 0.000 claims abstract description 4
- 239000011702 manganese sulphate Substances 0.000 claims abstract description 4
- 235000007079 manganese sulphate Nutrition 0.000 claims abstract description 4
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims abstract description 4
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 35
- 238000009713 electroplating Methods 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 9
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- 239000000758 substrate Substances 0.000 claims description 6
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract 3
- 229910052748 manganese Inorganic materials 0.000 abstract 3
- 239000011572 manganese Substances 0.000 abstract 3
- 230000003340 mental effect Effects 0.000 abstract 1
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 229910021607 Silver chloride Inorganic materials 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 6
- LEHOTFFKMJEONL-UHFFFAOYSA-N Uric Acid Chemical compound N1C(=O)NC(=O)C2=C1NC(=O)N2 LEHOTFFKMJEONL-UHFFFAOYSA-N 0.000 description 4
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
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Abstract
本发明公开了一种微型维生素C传感器,包括工作电极和参比电极,所述的工作电极由金属钛作基材,表面镀有二氧化锰层。其工作电极制作方法为:在玻璃基底上,采用光刻胶通过模板进行曝光,定义出电极的大小形状;采用溅射法在玻璃基底上淀积一层钛;采用电镀法,以硫酸锰溶液为电镀液,在钛表面再电镀一层二氧化锰;除去光刻胶即得到所需的钛基二氧化锰电极。本发明的维生素C传感器能有效解决检测干扰、电极成本较低,该传感器的电极制作方法十分简便、灵活,和微工艺结合,它能很简便的制作微电极。本发明在生物医学,食品,制药等领域中有很大的应用价值。
Description
技术领域
本发明涉及一种微型生物传感器,具体地说,是一种测量维生素C浓度的微型传感器及其制作方法。
背景技术
维生素C,也被称为抗坏血酸,在生物体内的新陈代谢中起到很重要的作用,因此维生素C的检测在生物医学工程中是一个十分重要的课题。同时,在制药和食品工业中也需要一种简单和快速的维生素C检测方法。维生素C可以用光谱法,色谱法,电化学分析法等加以检测。目前,光谱法是最普遍的使用方法。但是,光谱法一般成本较高。和其他的方法相比,电化学分析法具有简单和灵敏度高等优点。
维生素C本身具有一定的还原能力,因此比较早就有研究指出可以通过维生素C在铂电极上的氧化反应,采用电化学技术,特别是电流法来进行检测。传统的微型传感器由工作电极、参与电极和恒电流电位仪等组成,其工作原理如图1所示,一般采用铂作为工作电极2,银/氯化银电极作为参比电极3。工作过程中工作电极和参比电极浸入到被测溶液1中,工作电极上的电压通过恒电流电位仪4控制,一般所施加的电压为400毫伏(相对于银/氯化银参比电极)。在此电压上,维生素C被氧化:
反应所产生的电子流经工作电极。电流的大小和溶液中维生素C的浓度有关。恒电流电位仪4连接相应的电流测量装置5,因此通过测量电流可以得知维生素C的浓度。
该传感器的主要弊端为:
1.所采用的电极材料主要为铂,铂是一种贵金属,成本较高;
2.在铂电极上所需施加的维生素C氧化电压比较高,在此电压下,生物化学中的一些常见成分,如过氧化氢(双氧水),尿酸等也很容易被氧化,从而在检测过程中产生干扰。
同时,在传统的电化学检测中,所用的电极都比较大。这样检测中所需要的试剂,被测样本也就要求多。而且,在一些特定的场合,如人体血管中的在线测量,由于空间有限,这些大电极根本就不能使用。因而需要对微电极材料进行研究,以便于在微型空间内使用。
发明内容
本发明提供了一种能有效解决检测干扰、电极成本低的维生素C传感器,同时还提供了上述传感器的电极制作方法,该方法十分简便、灵活,和微工艺结合,它能很简便的制作微电极。
经研究发现,电镀法制备的二氧化锰电极对维生素C的氧化有催化作用,也就是维生素C在电镀法制备的二氧化锰电极上氧化电压比较低。在此低氧化电压下,过氧化氢,尿酸等不会氧化产生电流,因此有效地解决了干扰的问题。同时,电镀法本身是一种十分简便、灵活的材料制备方法,和微工艺结合,它能很简便的制作微电极。
一种微型维生素C传感器,包括工作电极和参比电极,所述的工作电极由金属钛作基材,表面镀有二氧化锰层。
本发明的微型维生素C传感器中的工作电极制作方法为:
(4)在玻璃基底上,涂上一层光刻胶,根据所需电极的大小,通过模板进行曝光,定义出电极的大小形状;
(5)采用溅射法在玻璃基底上淀积一层钛;采用电镀法,以硫酸锰溶液为电镀液,在钛表面再电镀一层二氧化锰;
(6)除去光刻胶即得到所需的钛基二氧化锰电极。
所述的电镀法电镀二氧化锰时控制流经钛表面的电流在6-10微安每平方厘米。
本发明制作的二氧化锰电极对维生素C的电化学氧化具有较强的催化能力。在此电极上,采用电流法测试维生素C的浓度时,所需施加的电压仅为100毫伏(相对于银/氯化银参比电极)。在此条件下,传感器对维生素C的线性相应范围为0到3毫摩,且对2毫摩的过氧化氢和尿酸没有任何相应。该项发明在生物医学,食品,制药等领域中有很大的应用价值。
附图说明
图1为本发明原有维生素C传感器的工作原理示意图;
图2为本发明传感器的输出结果:维生素C浓度-输出电流关系图。
具体实施方式
一种微型维生素C传感器,包括工作电极和参比电极,所述的工作电极由金属钛作基材,表面镀有二氧化锰层。参比电极材料可采用银/氯化银参比电极。
其工作电极的制作过程为:在玻璃基底上,首先涂上一层光刻胶。然后,根据所需电极的大小,采用合适的模板,进行曝光,定义出电极的大小形状。下一步,可以采用溅射法常用微加工方法等,在玻璃基底上淀积一层钛,钛膜的厚度为100纳米。接着,采用电镀法,在钛表面再电镀一层二氧化锰。电镀时所采用的具体装置和图1所示的装置相似,只是用钛电极代替图1中的工作电极2,参比电极3采用银/氯化银参比电极。
电镀液可采用为1摩尔浓度的硫酸锰,在电镀过程中,通过恒电流电位仪4控制流经钛电极的电流在6-10毫安每平方厘米左右。电镀的时间根据所需电极的厚度决定,可控制在10分钟之间。电镀完除去光刻胶即得到所需的二氧化锰电极。
图2所示为依据本发明方法制作的一微二氧化锰维生素C传感器的输出结果,其对0到3毫摩浓度的维生素C呈线性响应。该传感器电极的大小为1平方毫米。在二氧化锰的电镀过程中,所采用的电流密度为8毫安每平方厘米,电镀的时间为3分钟。在维生素C的检测过程中,施加到二氧化锰电极的电压为100毫伏(相对于银/氯化银参比电极)。测试的溶液为含维生素C的磷酸缓冲液(0.04摩尔浓度的磷酸,4.5%的氯化钠,pH为7.4)。在此电压条件下,二氧化锰电极对2毫摩的过氧化氢和2毫摩的尿酸没有任何响应。
Claims (3)
1.一种微型维生素C传感器,包括工作电极和参比电极,所述的工作电极由金属钛作基材,表面镀有二氧化锰层。
2.根据权利要求1所述的微型维生素C传感器的制作方法,包括所述的工作电极制作方法为:
(1)在玻璃基底上,涂上一层光刻胶,根据所需电极的大小,通过模板进行曝光,定义出电极的大小形状;
(2)采用溅射法在玻璃基底上淀积一层钛;采用电镀法,以硫酸锰溶液为电镀液,在钛表面再电镀一层二氧化锰;
(3)除去光刻胶即得到所需的钛基二氧化锰电极。
3.根据权利要求2所述的微型维生素C传感器的制作方法,其特征在于:电镀法电镀二氧化锰时控制流经钛表面的电流在6-10微安每平方厘米。
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CN106353391A (zh) * | 2016-11-07 | 2017-01-25 | 苏炳成 | 一种快速测定维生素c的方法 |
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US6337160B1 (en) * | 1997-01-31 | 2002-01-08 | Merck Patent Gesellschaft Mit Beschrankter | Manganese dioxide electrodes, process for producing the same and their use |
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