• Welcome to the website of Tohoku Electronic Industrial (TEI) Co., Ltd.

    TEI, founded in 1968, is an innovative company developing new instruments under the motto "opening up the future of photonics and electronics". We believe that precision instruments are essential for manufacturing quality products. TEI successfully developed the world’s most advanced ultra-high sensitive photo-counting technique in 1976 under a Government supported contract "Analytical Instrument for Evaluating the Degradation of Oil using Optoelectronics"

  • Chemiluminescence Analyzer Outline

    What is Chemiluminescence?

    "Chemiluminescence" (chemical luminescence) is the phenomenon arising from chemical reactions. Compounds generated in an excited state by chemical reactions, when released to the ground state, discharge light. Exposed to the atmosphere almost all materials generate chemiluminescence as a result of oxidation reactions. The Chemiluminescence Analyzer (CLA series) is the world’s most sensitive photon counting device. It detect down to 50 photons/cm2/sec (about 1/10000 of a firefly) 10-15 Watts.

  • Advantages of Chemiluminescence Method (CL Method)

    It is important to evaluate and prolong the life-times of new products. Conventional methods are unable to evaluate the early-stages of deterioration and inefficient time-consuming testing is necessary:

    Sample collection from the market -> several years
    Outdoor exposure test -> few years
    Accelerated testing -> several months

    Conversely, our CL method directly detects very small traces of peroxide allowing a material's oxidation level to be determined very quickly.

     

    Evaluation of early stage of oxidation & stability to oxidation

    Direct measurement of peroxides

    Multiple measurement and imaging detection by CCD camera

    Detect active oxygen, micro analysis with high sensitivity

    Monitor the cavitation or physiological luminescence

  • Chemiluminescence Intensity

    Many things emit ultra-weak light invisible to the human eye in the form of Chemiluminescence, Bioluminescence or Biophoton and research studies are carried out in several field to detect such invisible light. Especially Chemiluminescence is able to estimate the oxidation or deterioration levels of organic samples. Our instrument can be applied not only this oxidation field but also in a variety of other fields.

  • Early Stage Estimation

    It is important to evaluate and prolong the life-times of new products. Conventional methods are unable to evaluate the early-stages of deterioration and inefficient time-consuming testing is necessary:

    Sample collection from the market -> several years
    Outdoor exposure test -> few years
    Accelerated testing -> several months

    Conversely, our CL method directly detects very small traces of peroxide allowing a material's oxidation level to be determined very quickly.

    1

    New Sample

    2

    CL Method

    3

    Chemical Analysis

    4

    Physical Test

    5

    Life Time

  • formed during oxidation

    The products of luminescence according to the Russell Mechanism are singlet oxygen and excited carbonyl arising from the bimolecular degradation of hydroperoxides*.
    When an excited carbonyl species is released to the ground state, it releases its energy as a photon of light.
    Therefore, by following this chemiluminescence, it is possible to measure the degree of oxidation or degradation of a sample. This is a unique and extremely sensitive measure of oxidation.

  • Auto oxidation mechanism

    Samples are oxidized by heat, light or other stimulators. Then, according to the oxidation reaction, R or ROO will be produced and changing to peroxides (ROOH).
    When the peroxides are decomposed, peroxyradicals (ROO
    ) will be produced again and 2 molecules of peroxyradicals will produce the excited carbonyls and active oxygen such as singlet oxygen.
    When the excited compounds are released to the ground state, energy is released as heat or light. So, by measuring chemiluminescence, we can estimate the amount of peroxides or the level of a sample’s oxidation.

  • Typical Chemiluminescence(CL)Time-course Change

    When the sample placed in the sample chamber is heated, surface oxidized products such as peroxides decompose and produce CL (peak ①).
    This CL peak indicates the oxidation level at that time. After that, the CL pattern changes depending on the atmosphere. When measured under N2, CL decreases to 0 (zero). Under O2, the sample is oxidized by heat and O2.
    For a limited time anti-oxidants inhibit the oxidation and suppress the CL(②).

    But after all the anti-oxidants are consumed, the auto-oxidation mechanism commences (③).
    This point is the oxidation induction time (OIT) (④). OIT provides an estimate of the oxidation stability of NEW samples.
    CL measurement has the merit of being "easy" and "fast" in assessing the oxidation stability of new samples. There is no necessity to oxidize the samples before measurement.

  • Product List

    There are three instrument models and four sample chamber types.

    The optimum selection and combination depends on the needs of the particular research project.

  • Chemiluminescence Analyzer Series

    CLA-FS4

    A most highly sensitive instrument using Photomultiplier (PMT) as a detector. CL intensity and CL spectrum can be measured. Our standard product applicable to any study.

    CLA-FL2

    Using Photomultiplier (PMT) as a detector. This model is used with high performance liquid Chromatograpy (HPLC) and the value output from 0 to 1V. A recorder is needed to process the data.

    CLA-ID4

    Uses Photomultiplier (PMT) as a detector – a very high sensitive detector measuring CL intensity only.

    CLA-IMG

    Uses CCD Camera as a detector. allowing a CL image of the oxidation area of in a sample to be taken. A maximum 6 samples can be measured at the same time.

    CLA-SP3

    Employs a CCD Camera and Diffraction grating. Spectral data with high resolution in a very short time (0.1 sec) can be measured

  • Sample Chamber

    CLS-SH1

    Batch Type sample chamber for maximum φ20mm samples.
    Operating range: room temp. to 350 degree with facility for varying the heating rate.

    CLS-ST3

    Batch Type sample chamber for maximum φ50mm samples.
    Operating range: room temp. to 160 degree.

    CLS-MX3

    Batch Type sample chamber for maximum φ50mm samples.
    Operating range: room temp. to 100 degree with facility for mixing samples using a stirrer.

    CLS-FL

    Flow type sample chamber.
    Two inlet ports for introducing liquid samples for mixing inside the chamber, and an outlet port for discharging the mixture/product.

    CLS-MS

    Used with CLA-IMG.
    6 samples of maximum φ20mm can be measured.
    Operating range room temp. to 160 degree.

    CLS-LA

    Incorporates a Laser Diode to facilitate sample irradiation (laser power ~ 0.2mW).

  • Application Notes

    Click here to download the file.

    Others
    Biochemistry
    Food
    Polymer
  • Application Fields

    Oxidation of Polymers, Paints, Rubber

    • Estimate stabilities of new material under R&D

    • Inspection of received materials

    • Quality control of the product

    • Optimising moulding process conditions

    • Evaluation of recycled materials

    • Reducing material development times

    Oxidation of Oil, Food, Chemicals

    • Product quality control

    • Reducing development times

    Additives Efficacy

    • Development of new materials

    • Determining optimum condition such as density or compositions

    Micro Analysis

    • For detecting peroxide, hydroperoxide, hydrogen peroxide etc. at high sensitivity (femto mole, ppb level)

    Ultra sensitive Fluorescent Assay

    • Investigation of Cancer, surface analysis

    Imaging

    • Imaging of a sample's oxidation

    Others

    • Detection of electron irradiation history
    • Monitoring surface treatment
    • Cavitation or Ultrasonic waves
  • Tohoku Electronic Industrial (TEI)

    TEI, founded in 1968, is an innovative company developing new instruments under the motto "opening up the future of photonics and electronics". We believe that precision instruments are essential for manufacturing quality products. TEI successfully developed the world’s most advanced ultra-high sensitive photo-counting technique in 1976 under a Government supported contract "Analytical Instrument for Evaluating the Degradation of Oil using Optoelectronics"

    From their base in Miyagi, Japan, almost 500 instruments have been supplied to companies concerned with the stability of materials to oxidative degradation, and also to researchers concerned with the sensitive detection of peroxides in food or biomaterials, or the estimation of antioxidant ability.

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