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Oxygen electrodes

An oxygen electrode and electrode technology, applied in the field of oxygen electrodes, can solve the problems of bacteria diffusion, printing peeling, high cost, etc., and achieve the effects of improving measurement accuracy, good adhesion, and reducing pinholes

Active Publication Date: 2006-02-22
生物台达株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems with this method in that it requires the operation of serially diluting the sample, and requires incubation for 24 to 48 hours, etc.
[0004] However, since the oxygen electrode used in the patent document is formed by printing platinum or silver, which is a noble metal, on a ceramic plate, there is a problem of high cost.
In addition, when the oxygen electrode is used again, it must be sterilized with ethanol after washing with water, but sometimes there is a concern that the bacteria will spread and contaminate the surrounding area during washing.
In addition, a method of using pressurized steam sterilization without washing with water is also considered, but since the oxygen electrode is formed by printing, there is a problem that the printing is peeled off and cannot be reused when using pressurized steam sterilization

Method used

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Examples

Experimental program
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Embodiment approach 1

[0040] FIG. 1 shows a block diagram of a bacteria count measuring device using an oxygen electrode according to the present embodiment. A battery 1 is provided in this bacterial count measuring device, and a culture medium to which a sample is added is stored in the battery 1 . Furthermore, an oxygen electrode 2 used in the oxygen electrode method is provided in the battery 1 . FIG. 2 shows a cross-sectional perspective view of the battery 1 . Three electrodes constituting the oxygen electrode 2 are provided on the side wall near the bottom of the battery 1 , namely the counter electrode 21 , the working electrode 22 and the reference electrode 23 . Furthermore, the battery 1 is provided with an output terminal 24 electrically connected to the counter electrode 21 , the working electrode 22 , and the reference electrode 23 , and the oxygen electrode 2 is connected to the current measuring unit 3 through the output terminal 24 .

[0041] In the current measuring unit 3 in FIG...

Embodiment approach 2

[0056] Since the oxygen electrode 2 according to the first embodiment is composed of the copper electrode base material 10 - the nickel layer 11 - the Au layer 13, the oxygen electrode can be formed at low cost. However, when the nickel layer 11 is deposited on the surface of the electrode base material 10 under general plating conditions, there is a problem that pinholes are likely to be formed on the nickel layer 11 . If pinholes are formed on the nickel layer 11, the Au layer 13 laminated thereon will also be affected by the nickel layer 11 to cause pinholes. If a large number of pinholes are formed in the Au layer, the surface of the electrode base material 10 will be exposed, and when measuring the amount of dissolved oxygen in a liquid medium, there will be a difference between the current value at the initial stage of measurement and the predetermined threshold value due to the influence of the electrode base material 10 The problem of getting smaller.

[0057] The dif...

Embodiment approach 3

[0070] In Embodiment 2, copper is used for the electrode base material 10 , but the present invention is not limited thereto, and other materials may be used for the electrode base material 10 as long as it is suitable for measuring the amount of dissolved oxygen. For example, in this embodiment, stainless steel is used for the electrode base material 10 . In addition, the bacterial count measuring device using the oxygen electrode according to the present embodiment is the same as the block diagram of the bacterial count measuring device shown in FIG. 1 . Furthermore, the battery 1 used in this embodiment is also the same as the cross-sectional perspective view of the battery 1 shown in FIG. 2 . Therefore, detailed descriptions of the bacterial count measuring device and the battery 1 are omitted.

[0071] Next, the cross-sectional view of the oxygen electrode 2 according to this embodiment is basically the same as the cross-sectional view shown in FIG. 6 , except that the e...

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Abstract

The structure of an oxygen electrode which can be formed at such a low cost that the oxygen electrode can be disposable. An oxygen electrode (2) is used for measuring the dissolved oxygen in a liquid culture medium, and comprises an electrode parent material (10) and a surface metal layer (13) composed of any one of Au, Pt or Ti covering the surface of the electrode parent material (10). In particular, when the surface metal layer (13) of Au is formed on the electrode parent material (10) composed of copper by electroplating, a nickel layer (11) is deposited on the surface of the electrode parent material (10) by electroplating or the like. Subsequently, the Au layer (13) is deposited on the nickel layer (11) by electroplating.

Description

technical field [0001] The present invention relates to the invention of an oxygen electrode, especially an oxygen electrode for measuring the amount of dissolved oxygen in a liquid medium. Background technique [0002] Conventionally, the measurement of the number of bacteria present in food has sometimes been required for the purpose of food sanitation management or the like. So far, as a method of measuring bacteria present in samples such as food, the following method is generally used: serially dilute the sample and mix it with the agar medium or apply a certain amount of each diluted sample, culture for 24 to 48 hours, and pass the target. The number of bacteria was determined by counting the number of colonies produced. However, this method has problems in that it requires the operation of serially diluting the sample, culturing for 24 to 48 hours, and the like. Therefore, a method as shown in Japanese Unexamined Patent Application Publication No. 2000-287699 (herei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/404
Inventor 赤松惠宇津野万里子
Owner 生物台达株式会社
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