公开(公告)号：JPH0735725A

公开(公告)日：1995-02-07

申请号：JP19922693

申请日：1993-07-15

Applicant: KAGOME KK

Inventor： HORIKAWA NAOSHI ,  HAYAKAWA YOSHIO ,  YAMADA YASUNORI

IPC: G01N27/416 ,  G01N27/48 ,  G01N33/02

Abstract: PURPOSE:To enhance the measurement accuracy by adding a buffer, previously dissolved with orthophenylenediamine, to a sample and causing reaction while conditioning the pH to a specified value and to shorten the measuring time by making convenient the operation. CONSTITUTION:Orthophenylenediamine is previously dissolved into a buffer which is added to a predetermined quantity of sample of processed drink or food or preprocessed liquid thereof thus causing reaction while conditioning pH in the range of 2.5-7.0. In other words, diacetyl contained in the processed drink or food or the preprocessed liquid thereof is caused to react on othrophenylenediamine while conditioning pH to convert diacetyl into 2,3- dimethylqiunoxaline. It is further subjected to deoxygenation and fed to differential pulse voltammetry. In the deoxygenation, nitrogen gas is fed into the solution caused to react after conditioning of pH thus removing the dissolved oxygen from the solution. When the dissolved oxygen is not removed, the sensitivity is lowered.

公开(公告)号：JPH05240838A

公开(公告)日：1993-09-21

申请号：JP7869692

申请日：1992-02-27

Applicant: KAGOME KK

Inventor： HORIKAWA NAOSHI ,  HAYAKAWA YOSHIO ,  YAMADA YASUNORI

IPC: G01N27/48 ,  G01N33/04 ,  G01N33/14

Abstract: PURPOSE:To make it possible to apply the measuring method on manufacturing process for processed food and drink products without trouble by adding orthophenylenediamine for reaction after the addition of a buffer container to the food and drink, pH adjustment and deoxidation treatment, and shortening the measuring time of diacetyl. CONSTITUTION:For example, a part of tomato juice is sampled in the final stage of the manufacturing process of the tomato juice Briton-Robinson buffer or the like of 96ml is added into distilled initial boiling of 4ml, and the pH is adjusted to 5.0. Nitrogen gas is made to pass through this adjusting liquid. In the liquid wherein dissolved oxygen is removed, orthophenylenediamine is added so as to obtain the concentration of about 5ppm, and reaction is made to occur. The reacted liquid is supplied into differential pulse voltammetry, and the peak current value is read. The value is compared with the already formed calibration curve, and the diacetyl concentration is measured. Thus, the measurement up to the diacetyl concentration of about 0.08ppm can be performed. The reproducibility of the measured value is excellent, and the required measuring time can be shortened to about 1/4 or less.

公开(公告)号：JPH0772119A

公开(公告)日：1995-03-17

申请号：JP24372393

申请日：1993-09-03

Applicant: KAGOME KK ,  TOA ELECTRONICS

Inventor： HORIKAWA NAOSHI ,  HAYAKAWA YOSHIO ,  YAMADA YASUNORI ,  KAKEFUDA YOSHIHIKO ,  ITO YOSHIHARU

IPC: G01N27/48 ,  G01N33/02

Abstract: PURPOSE:To provide a measuring apparatus which automatically measure diacetyl contained in processed foods in the a short time with high accuracy in the production process thereof. CONSTITUTION:The apparatus for measuring the concentration of diacetyl is provided with a reaction container 19 having a sample injection port 11, a buffer solution supply source connected to a liquid supply port 21 of the reaction container 10 throufh a pump 22 for supplying liquid. a solenoid valve 32 for adjusting the surface of liquid connected to an overflow port 31 of the reaction container 10, an inert gas supply source connected to an air supply port 41 of the reaction container 10 through a solenoid valve 43 for supplying air and a pump 53 for draining liquid connected to a drain port 51 of the reaction container 10 through a solenoid valve 52 for draining liquid. It is also provided with electrodes 64, 65 and 66 inserted into the reaction container 10, a body 71 of the measuring apparatus and an arithmetic device 81 to control the operations of the pump for supplying liquid, the solenoid valve for adjusting the surface of liquid, the solenoid valve for supplying air, the solenoid valve for draining liquid, the pump for draining liquid and the body of the measuring apparatus according to a program preset.