CN-121986262-A - Gas preparation device for odor evaluation

CN121986262ACN 121986262 ACN121986262 ACN 121986262ACN-121986262-A

Abstract

The odor evaluation gas preparation apparatus comprises a gas chromatograph (1) having a separation column (10) for separating a plurality of components contained in a gas to be analyzed, a time zone detection unit (2) for detecting a time zone in which each of the plurality of components has come out of the separation column, a gas recovery unit (5) for recovering a component gas containing all or a part of the plurality of components that have come out of the separation column into a sampling bag, a gas introduction unit (56) for introducing a diluting gas into the sampling bag under a predetermined gas introduction condition, a flow information acquisition unit (14) for acquiring flow information of the component gas, a time zone setting unit (63, 65, 66) for setting a time zone in which the component gas is recovered by the gas recovery unit with reference to the time zone, a total volume setting unit (63, 65, 66) for setting a total volume of the component gas recovered into the sampling bag and the diluting gas introduced into the sampling bag, and a condition determination unit (62) for determining the gas introduction condition based on the flow information, the time zone, and the total volume.

Inventors

KAWAMURA KAZUMASA
JUNICHI KITA
INOUE TAKAAKI
Taisheng under wood

Assignees

株式会社岛津制作所

Dates

Publication Date: 20260505
Application Date: 20241015
Priority Date: 20231031

Claims (4)

1. A gas production device for odor evaluation is characterized by comprising: A gas chromatograph having a separation column for separating a plurality of components contained in an analysis target gas having an odor in a time direction; a time zone detection unit configured to detect a time zone in which each of the plurality of components exits the separation column; a gas recovery unit configured to recover a component gas containing all or a part of the plurality of components extracted from the separation column into a sampling bag by passing the analysis target gas through the separation column; a gas introduction unit that introduces a diluting gas into the sampling bag under predetermined gas introduction conditions; a flow information acquisition unit that acquires flow information that is information on the flow rate of the component gas exiting the separation column; A time range setting unit configured to set a time range in which the component gas is recovered by the gas recovery unit, with reference to the time intervals of each of the plurality of components detected by the time interval detection unit; A total volume setting unit for setting a total volume of the component gas collected in the sampling bag and the dilution gas introduced into the sampling bag by the gas introduction unit, and And a condition determining unit configured to determine the gas introduction condition of the gas introduction unit based on the flow information acquired by the flow information acquiring unit, the time range set by the time range setting unit, and the total volume set by the total volume setting unit.
2. The gas preparation device for odor assessment according to claim 1, wherein, Comprises a storage unit for storing the relationship between the flow rate and the pressure of the dilution gas introduced by the gas introduction unit, The gas introduction portion introduces the dilution gas into a flow path connecting the separation column and the sampling bag in a state where the separation column and the sampling bag are in communication, The condition determining unit calculates a flow rate of the dilution gas introduced by the gas introducing unit based on the flow rate information acquired by the flow rate information acquiring unit, the time range set by the time range setting unit, and the total volume set by the total volume setting unit, and determines a pressure at which the dilution gas is introduced by the gas introducing unit based on the calculated flow rate and the relational expression.
3. The gas preparation device for odor assessment according to claim 1, wherein, The gas introducing section is configured to introduce the dilution gas into the sampling bag after the gas recovering section recovers the component gas into the sampling bag, The condition determining unit determines the volume of the dilution gas introduced by the gas introducing unit based on the flow information acquired by the flow information acquiring unit, the time range set by the time range setting unit, and the total volume set by the total volume setting unit.
4. The gas preparation device for odor assessment according to claim 1, wherein, The gas recovery unit is configured to pass the analysis target gas through the separation column a plurality of times, thereby recovering the component gases each containing the same component from the separation column into a different sampling bag, The volume setting unit sets the total volume to be different for each of the different sampling bags.

Description

Gas preparation device for odor evaluation Technical Field The present invention relates to a gas production apparatus for odor evaluation for evaluating odors (odor and aroma) of various substances. Background Fragrances added to foods, beverages, cosmetics, detergents and the like are sometimes produced by simulating the fragrance (natural fragrance) emitted from natural products such as flowers, herbs, fruits and the like. Natural flavors are often complex odors obtained by mixing various components, and various odors are generated depending on the types of the components and the proportions of the components. However, not all of the components that make up the natural fragrance contribute to the formation of this odor, but also components that contribute very little or no contribution. In the field of perfume development, there is a demand for identifying a component contributing to odor formation or a component not contributing to odor formation among components contained in natural perfume. The absence test (Omission Test) is one of the methods for identifying whether the ingredients contained in the natural perfume are ingredients contributing to the formation of odors. In the deficiency test, a deficiency gas is prepared by removing an arbitrary component from the analysis target gas, and the deficiency gas is compared with the analysis target gas in terms of odor, and based on the similarity of the odors, it is evaluated whether or not the aforementioned component removed from the analysis target gas is a component contributing to odor formation. For example, if the odor evaluating apparatus described in patent document 1 is used, the above-described deficiency test can be efficiently performed. The odor evaluation device described in patent document 1 includes a gas chromatograph having a separation column for separating a gas to be analyzed, a gas recovery unit for recovering, by passing the gas to be analyzed through the separation column a plurality of times, a gas (total-component gas) containing all components discharged from the separation column and a gas (missing gas) from which a predetermined component is removed from the components discharged from the separation column into different sampling bags, an odor sniffing port for performing sensory evaluation by sniffing the gas recovered in each sampling bag, and an odor sensor for detecting the odor of the gas recovered in each sampling bag. Then, based on the result of the sensory evaluation or the detection result of the odor sensor, an index value indicating the similarity between the whole-component gas and the missing gas is calculated. In the odor evaluation apparatus, in order to prevent components having high adsorptivity from adhering to a flow path from the separation column to the gas recovery unit, the dilution gas is introduced into the flow path at a constant flow rate (pressure) in a state where the separation column is in communication with the gas recovery unit. Thus, while the gas containing the components discharged from the separation column passes through the flow path, the diluting gas is recovered into the sampling bag through the flow path. With this structure, the gas containing the components discharged from the separation column and the diluting gas in an amount corresponding to the amount of the gas are recovered in the sampling bag. The gas recovered in the sampling bag is used as a gas for odor evaluation for sensory evaluation or odor detection using an odor sensor. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2022-73441 Disclosure of Invention Technical problem to be solved by the invention The sensory evaluation using the odor sniffing was performed by sequentially performing odor sniffing by a plurality of evaluators while allowing the components contained in the gas recovered in the sampling bag to be released from the odor sniffing. Therefore, in order to perform sensory evaluation, a certain amount of gas needs to be contained in the sampling bag in a sufficient amount. However, in the above-described conventional odor evaluating apparatus, since the amount of the gas recovered into the sampling bag depends on the amount of the gas containing the component coming out of the separation column (or the period during which the gas passes through the aforementioned flow path), it may be difficult to perform sensory evaluation depending on the case. The problem to be solved by the present invention is to easily prepare an arbitrary amount of odor evaluating gas. Solution to the above technical problems The odor evaluating gas producing apparatus according to the present invention, which has been completed to solve the above-described problems, comprises: A gas chromatograph having a separation column for separating a plurality of components contained in an analysis target gas having an odor in a time direction; a time zone detection unit configured to detec