JPH0727698A - Method for detecting akame laver - Google Patents

Abstract

PURPOSE:To provide a method for detecting AKAME laver (not genuine laver) which can agree with the paneller's (inspector's) judgment. CONSTITUTION:A reflectance of a wavelength in a vicinity of 470nm and 630nm of dry laver is measured to obtain a ratio of the reflectances of these two wavelengths, and it is compared with a calibration curve that is the evaluation criterion to detect AKAME laver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting seaweed seaweed in dried seaweed.

[0002]

2. Description of the Related Art Conventionally, as a method for detecting seaweed laver of this kind, the surface of the seaweed is divided into a number of measurement sections, and the diffuse reflectance at a wavelength of about 600 to 680 nm in each section is measured.
A method is known in which the distribution of the diffuse reflectance is calculated to calculate the shape of each distribution and the reflectance of the median value, and the hue is determined by comparing these with a calibration curve of an evaluation standard ( (See JP-A-63-52862).

[0003]

However, in the conventional method for detecting seaweed nori, there is a problem that a judgment different from the evaluation of the tint of the inspector (panel panel) occurs. This problem occurs when the conventional method for detecting seaweed nori is 60
The wavelength of 0 to 680 nm, that is, the distinction of the diffuse reflectance of red and the calibration curve is uniquely discriminated, while the panelists are discriminated by the relative comparison of red and navy blue or purple. It is believed that That is, the spectral distributions of reflectance of the ones evaluated as akame by the panelists and those evaluated as relatively few akame were as shown in FIGS. 3 and 4. Comparing the two figures,
It can be seen that there is a difference in the distribution around 470 nm. As shown in FIG. 5, which shows the visible absorption spectrum of the seaweed pigment extract, the carotenoid (carinoid) region around 470 nm is
It is the absorption band of the otenoid). Since carotenoid is a factor related to the taste of seaweed together with chlorophyll, the lower the reflectance around 470 nm, the higher the quality of seaweed, and the more phycocyanin (p
The higher the absorbance around 630 nm, which is the absorption band of hycocyanin, the higher the quality of seaweed. Therefore,
When the absorption by phycocyanin is smaller than the absorption by carotenoid, the panelists have relatively high reflectance around 630 nm, so it is judged as akame, or when there is more carotenoid even if the reflectance around 630 nm is similar. Since the absorption around 470 nm by carotenoid becomes large and the reflectance around 630 nm becomes relatively high, it is considered that the carotenoids are judged to be akame and discriminated by relative comparison. Therefore, it is an object of the present invention to provide a method for detecting seaweed nori, which can be matched with the judgment of the panelists.

[0004]

In order to solve the above-mentioned problems, the method for detecting seaweed seaweed according to the present invention is the same as dried seaweed 47
Measure the reflectance at wavelengths near 0 nm and 630 nm,
The feature is that the ratio of the reflectances of these two wavelengths is obtained, and this is compared with the calibration curve of the evaluation standard to detect the seaweed laver.

[0005]

In the above means, the influence of optical conditions such as the brightness of the light source is eliminated, and at around 470 nm and 630 nm.
The grade of the reflectance ratio of two wavelengths around nm has a good correlation with the grade of akame according to the visual judgment. The measurement location of the reflectance may be one location, several locations, or multiple locations.

[0006]

EXAMPLES Examples of the present invention will be described in detail below. A large number of dried laver from 1 to 5 grades (smaller grades are finer) pre-graded by panelists were irradiated with white light, and 470 nm and 630 nm were irradiated.
The reflectances in the vicinity were each measured, and the ratio of the reflectances at each two wavelengths was determined. The results are shown in Table 1 (the numbers in the table are multiplied by 1000) and FIG.

[0007]

[Table 1]

From Table 1 and FIG. 1, the ratio of the two wavelength reflectances is
It can be seen that it has a good correlation with the grade. or,
When the color information (CIE L ^* a ^* b ^* ) of the dried seaweed was obtained by a spectrocolorimeter, it was as shown in FIG.
It can be seen from FIG. 2 that the degree of separation of each grade is not so good, but that the higher the grade is, the higher the saturation of 5YR is. Therefore, the detection of seaweed nori is 4, 5
Since the seaweed of the grade is considered as seaweed seaweed, when the seaweed seaweed had a reflectance ratio of two wavelengths of less than 0.85, it was very well in agreement with the panel's visual judgment.

[0009]

As described above, according to the method for detecting seaweed seaweed of the present invention, the influence of optical conditions such as the brightness of the light source is eliminated, and the reflectance of two wavelengths near 470 nm and 630 nm. Since the grade of the ratio has a good correlation with the grade of akame according to the visual judgment, it can be matched very well with the visual judgment of the panel.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the relationship between the grade of dried laver and the reflectance ratio of two wavelengths.

FIG. 2 is an explanatory diagram of color information of dried laver of each grade.

FIG. 3 is a spectral distribution map of dried seaweed evaluated as akame.

FIG. 4 is a spectral distribution map of dried seaweed that is evaluated to have relatively few akame.

FIG. 5 is a visible absorption spectrum distribution diagram of a seaweed pigment extract.

Claims (1)

[Claims] 1. Dried seaweed around 470 nm and 630 nm
A method for detecting akame seaweed, characterized in that the reflectance of wavelengths in the vicinity is measured, the ratio of the reflectances of these two wavelengths is obtained, and this is compared with a calibration curve of an evaluation standard to detect akame seaweed.