JP4504843B2 - Judgment method of swollen non-disintegration region of crab noodles - Google Patents

Description

  The present invention relates to a method for determining a swollen non-disintegrating region of crab noodles at a low cost and in a simple manner.

  Boiled noodles typified by udon and pasta are obtained by heating raw noodles or dry noodles mainly composed of wheat flour or durum semolina for several minutes to several tens of minutes in high-temperature water, for example, boiling water. The starch-protein complex that constitutes the noodles when heated absorbs water and expands (hereinafter referred to as “swelling”). As the heating continues, the swelling further proceeds. Collapse of the composite grain occurs. This series of phenomena from swelling to disintegration is also called “gelatinization”. Water absorption into the noodles is performed from the part in contact with water, that is, from the outside of the noodles, so that gelatinization is performed from the outer edge part and eventually diffuses to the center part.

Therefore, when boiled for a short time, as shown in FIG. 14, a region in which the starch-protein complex particles are sufficiently swollen and collapsed is formed on the outside of the noodle 12 (hereinafter referred to as “swelling disintegration region”). 12a), while the starch noodles are swollen but not collapsed in the center of the noodles (hereinafter referred to as "swollen non-disintegrated region"). 12b exists.
In FIG. 14, D1 represents the radius of the swollen non-disintegrating region 12b at the center of the bowl noodle 12, D2 represents the radius of the bowl noodle 12, and PD represents the diameter of the bowl noodle 12 (PD = 2 × D2). The value M represents (D1 + D2).

Here, the texture of the noodles such as udon and pasta is controlled by the size (size) of the swollen non-disintegrating region that remains as a needle-like core in the center of the noodles. . In addition, the preferred texture of the noodles, such as the strength and texture of the noodles, varies depending on the type of noodles such as udon and pasta. It depends on the type.
For this reason, if the swollen non-disintegrating region of the crab noodles can be determined with high accuracy, in other words, if the boundary between the swollen non-disintegrating region and the swollen disintegration region can be identified with high accuracy, the boiling time without excessive or shortage in the production of crab noodles To gain knowledge about That is, in the production of strawberry noodles, depending on the type of strawberry noodles, it is possible to obtain the time required to leave a swollen non-disintegrating region in the strawberry noodles that gives an appropriate texture such as moderate strength and texture.

However, the measurement for determining the swollen non-disintegrating region of the noodles must be made quickly and has been very difficult in the past.
Therefore, by using MRI (nuclear magnetic resonance imaging apparatus) to analyze the change in the moisture gradient inside the noodles, the boundary between the swollen non-collapse region and the swollen disintegration region is specified, A method for determining a collapse region has been proposed (see Non-Patent Document 1).

When the method proposed in Non-Patent Document 1 is used, it has become possible to quickly determine the swollen non-disintegrating region of the noodles, which has been very difficult until now.
However, on the other hand, since MRI is very expensive and complicated in operation, there is a problem that it is not suitable for practical use to determine the swollen / collapsed region of crab noodles using MRI. .
Journal of Food Engineering 49 pp1-6 (2001)

  The object of the present invention is to solve the above-mentioned problems of the prior art and apply an inexpensive and simple break test without using an expensive MRI, so that the MRI is used for the swollen non-disintegrating region of crab noodles. It is an object of the present invention to provide a method for determining a swollen non-disintegrating region of crab noodles, which can obtain a determination result with almost the same high accuracy as that of a cheap and simple method.

  In order to solve the above problems and achieve the above-mentioned problems, the present inventors have conducted various researches. As a result, the noodles were subjected to a breaking test, and the load-displacement curve of the noodles was obtained and obtained. By analyzing the load-displacement curve, it has been found that the determination result of the swollen non-collapse region can be obtained with high accuracy that is almost the same as when using MRI by a cheaper and easier method than using MRI. The present invention has been completed.

That is, in the present invention , the noodle compression test was performed with a break tester, and the measured penetration distance from the outer edge of the noodle noodle at the plunger tip of the break tester was measured corresponding to the displacement. The load from the crab noodle to the plunger is plotted to obtain a load-displacement curve of the crab noodle, the obtained load-displacement curve is secondarily differentiated, and is closest to the minimum point of the obtained second derivative curve The swollen non-disintegrating region of the crab noodle is obtained by approximating a portion including the maximal point with a quadratic function and determining the swollen non-disintegrating region of the crab noodle from the point giving the maximum value of the obtained quadratic function curve The determination method is provided.
Here, the load-displacement curve of the crab noodle performs the compression test, measures the intrusion distance from the crab noodle outer edge of the plunger tip of the breaker as a displacement, and is applied from the crab noodle to the plunger. It is preferable that a load is measured and obtained by plotting the displacement and the corresponding load.

According to the present invention, it is possible to obtain the same highly accurate determination result as in the case of using MRI for the swollen non-disintegrating region of crab noodles at a lower cost and more easily than using MRI. The method of the present invention is not limited to udon and pasta mainly composed of wheat flour, but Chinese noodles, Japanese soba, etc. It is applicable to various noodles.

  The method for determining the swollen non-disintegrating region of crab noodles according to the present invention will be described in detail below based on preferred embodiments shown in the drawings.

  The determination of the swollen non-disintegration region by the method for determining the swollen non-disintegration region of the present invention is performed by subjecting the crab noodle to a break test, specifically, performing a compression test of the crab noodle with a break test machine, The intrusion distance (hereinafter referred to as “displacement”) from the outer edge of the noodles of the plunger of the plunger is plotted on the horizontal axis, the load from the noodles to the plunger (hereinafter referred to as “load”) on the vertical axis, and the displacement and the corresponding load. This is based on data of a non-linear curve (hereinafter referred to as a load-displacement curve) obtained by plotting.

FIG. 1 is a schematic diagram showing an embodiment of a determination system for a swollen non-collapsed region of crab noodles including a breakage test system for performing a breakage test for carrying out the method for determining a swollen non-collapsed region of the present invention. is there.
The determination system (hereinafter also simply referred to as a determination system) 10 for the swollen non-collapse region of the crab noodles shown in the figure was obtained with a break tester 14 that performs a compression break test of the crab noodle 12 and a break tester 14. And an arithmetic processing system 16 that calculates and determines the swollen non-disintegration region of the noodles using the result.

  In FIG. 1, the fracture tester 14 is shown in a perspective view, with one configuration example simplified, and a horizontal sample stage 18 on which the sample noodles 12 are placed, and a placement surface of the sample stage 18. The tip 20a is arranged perpendicularly to the tip 20a and is tapered toward the bottom (for example, the width of the tip 20a is 1 mm) for compressing and breaking the crab noodles 12 placed on the sample stage 18. A plunger 20 that is a compression jig, which is movable in the vertical direction, is attached to the upper side of the plunger 20 and measures the load applied to the plunger 20 when the tip 20a enters the noodles 12 when the plunger 20 descends. A load meter 22 and a drive system 24 for moving the plunger 20 up and down are included.

  In the illustrated example, the tip 20a of the plunger 20 uses a blade (cutting blade) that becomes thinner toward the tip, but the present invention is not particularly limited, and the crab noodle 12 placed on the sample stage 18 is not limited. Any blade can be used as long as it functions as a blade (cutting blade) for compressing and breaking the blade, and any blade can be applied as long as it is a blade at the tip of the plunger of a conventionally known fracture tester. For example, as the tip 20a, a wire such as a metal wire attached to both ends fixed to the plunger may be used, or a plate or the like may be used instead of the wire.

Although not shown, the fracture tester 14 may include a display unit that displays the displacement of the plunger 20 (the amount of movement from the reference position) and the load measured by the load meter 22.
The rupture tester 14 used in the present invention is not limited to the rupture tester in the illustrated example, and any rupture tester can be used as long as it can perform the compression rupture test of the noodles 12, for example, a rheometer. A known breaking tester such as what is called or a static tester can be used.

  1 is a block diagram showing an example of the configuration of the arithmetic processing system 16. In the fracture testing machine 14, after the tip 20 a of the plunger 20 abuts the bowl noodle 12, the bowl noodle 12 is broken and the sample A curve creating means 26 for obtaining a load-displacement curve of crab noodles from the displacement of the plunger 20 (amount of movement from the reference position) measured until contacting the table 18 and the load measured by the load meter 22; A secondary differential means 28 for secondarily differentiating the load-displacement curve obtained by the curve creating means 26, and a portion including a local maximum point closest to the minimum point of the secondary differential curve obtained by the secondary differential means 28. Function approximating means 30 for approximating with a quadratic function, and area determining means 32 for obtaining a swollen non-collapse area of crab noodles from the point of giving the maximum value of the quadratic function curve obtained by the function approximating means 30.

In the present invention, the arithmetic processing system 16 is constituted by an arithmetic processing device such as a personal computer (PC), and each means of the curve creating means 26, the secondary differentiating means 28, the function approximating means 30 and the area determining means 32 is provided. It can be configured by software. For example, the curve creation means 26 may be constituted by a known plotter software, the secondary differentiation means 28 may be constituted by a known secondary differentiation software, and the function approximation means 30 and the like are also known functions. You may comprise with approximate software. Further, a part of the arithmetic processing system 16, for example, the curve creating means 26 may be configured by plotter software provided in the fracture testing machine 14. Thus, in the present invention, it is preferable that each of the curve creation means 26, the secondary differentiation means 28, the function approximation means 30 and the area determination means 32 is configured by software, but the arithmetic processing system 16 and its curve Each of the creating means 26, the secondary differentiating means 28, the function approximating means 30, and the area determining means 32 may be configured by hardware.
The determination system for carrying out the method for determining the swollen non-collapse region of the noodles of the present invention is basically configured as described above.

Next, the method for determining the swollen non-disintegrating region of the noodles of the present invention (hereinafter also simply referred to as a determination method) will be described with reference to the determination system 10 in the illustrated example.
In the determination method of the present invention, first, using a fracture testing machine 14 shown in FIG. 1, a crab noodle compression test is performed as follows.

  As shown in FIG. 1, the noodle 12 as a sample is placed on a horizontal sample table 18 by cutting it to a length that does not protrude from the sample table 18. A plunger 20 is disposed between the bowl noodle 12 and the load meter 22 perpendicular to the mounting surface of the sample stage 18. The plunger 20 is tapered toward the lower side, and the distal end portion 20 a extends perpendicular to the longitudinal direction of the bowl noodle 12. The plunger 20 can be moved up and down in the vertical direction. When the plunger 20 is lowered, the distal end portion 20 a approaches the outer edge of the bowl 12. Further, after the plunger tip 20a reaches the outer edge of the bowl noodle 12, the plunger 20 is lowered and the penetration distance of the tip 20a of the plunger 20 into the bowl noodle 12 is increased (in other words, As the displacement increases, the noodles 12 are compressed between the sample stage 18 and the plunger 20 to generate a load against the compression, and the load is measured by the load meter 22. The displacement is zero when the plunger tip 20 a touches the outer edge of the candy noodle 12 and increases until the candy noodle 12 is cut by the plunger 20. Therefore, the range of displacement is from 0 to the diameter of the noodles 12.

As a measurement result of the fracture tester 14 thus obtained, the displacement of the plunger 20 and the load by the load meter 22 are sent to the curve creating means 26 of the arithmetic processing system 16.
Next, the curve creation means 26 of the arithmetic processing system 16 plots the displacement and the load sent as the measurement result of the fracture tester 14 in this way, and obtains a load-displacement curve.
An example of the load-displacement curve thus obtained is shown in FIG.

In the load-displacement curve shown in FIG. 2, from the time when the plunger tip 20a touches the outer edge of the bowl noodle 12, as the tip 20a enters the bowl noodle 12, that is, as the displacement increases, The load gradually increases gradually.
Next, when the displacement further increases, the load finally reaches the maximum point, and there is a portion where the load decreases as the displacement increases, but the load immediately reaches the minimum point, and thereafter, as the displacement increases. The load increases rapidly.
When the displacement reaches the diameter PD of the bowl 12, the plunger tip 20 a comes into contact with the sample stage 18 and the displacement stops.

  Here, the maximum point of the load-displacement curve shown in FIG. 2 is that the tip 20a of the plunger 20 shown in FIG. 1 reaches the swollen non-disintegrating region 12b of the noodle 12 shown in FIG. Although it is thought that it shows, since the swelling collapse area 12a of the noodle 12 on the side in contact with the sample stage 18 is compressed and deformed by the penetration of the tip 20a into the noodle 12, the maximum point is reached. The displacement does not directly represent the value M shown in FIG. However, in the present invention, it is considered that the vicinity of the maximum of the load-displacement curve includes the information of the aforementioned value M, and further processing (differential processing) is performed on the load-displacement curve shown in FIG. An accurate value M is being obtained. In the example shown in FIG. 14, if the right end portion of the noodles 12 is placed on the sample stage 18 and the left end portion is the uppermost portion, the tip end portion 20a of the plunger 20 shown in FIG. Are first contacted, so the direction of break is defined by the direction indicated by arrow a. Therefore, the value M is defined on the center line parallel to the breaking direction a.

Thus, the load-displacement curve data obtained by the curve creation means 26 is sent to the secondary differentiation means 28.
Next, the secondary differentiating means 28 first differentiates (primary differentiation) the load-displacement curve using the load-displacement curve data thus sent.
FIG. 3 shows the first derivative result obtained by differentiating the load-displacement curve of FIG. 2 obtained in this way.
Subsequently, the secondary differentiation means 28 further differentiates (secondary differentiation) the primary differential curve thus obtained once again.
Here, FIG. 4 shows the result of differentiating the primary differential curve of FIG. 3 by the secondary differential means 28, that is, the secondary differential result (curve) obtained by secondary differentiation of the load-displacement curve of FIG. In FIG. 4, a point A is a local maximum point closest to the minimum point B of the secondary differential curve.

Next, data in the vicinity of the maximum point A of the secondary differential curve obtained by the secondary differential means 28 is sent to the function approximating means 30.
Next, the function approximating means 30 approximates the curve in the vicinity of the maximum point A in FIG. 4 with a quadratic function using the data in the vicinity of the maximum point A of the quadratic differential curve shown in FIG. Then, the maximum point of the obtained quadratic function curve is obtained.
Here, FIG. 5 picks up three points of data near the maximum point A in the secondary differential curve of FIG. 4 and connects them with straight lines. FIG. 6 shows two straight lines connecting the three points of FIG. This is the result of approximation with a quadratic function curve.

Thus, the approximate quadratic function curve of FIG. 6 obtained by the function approximating means 30 can be expressed by the following general function (formula 1) of the quadratic function.
y = ax ² + bx + c (Formula 1)
Differentiating Equation 1 above gives Equation 2 below.
dy / dx = 2ax + b (Formula 2)
Here, since y when dy / dx = 0 is a local maximum value, the value M of x at this time can be obtained by the following Expression 3.
M = −b / 2a (Formula 3)
Therefore, the area determination unit 32 can obtain the value M from the coefficients a and b of the approximate quadratic function curve of FIG. 6 obtained by the function approximation unit 30.

This value M represents the boundary between the swollen non-disintegrating region 12b and the swollen and disintegrating region 12a of the bowl noodle 12, that is, the distance from the outer edge of the bowl noodle.
Accordingly, the region determination means 32 is configured such that the radius D1 of the swollen non-disintegrating region of the noodles 12 is D2 when the radius of the noodles 12 obtained by multiplying the diameter of the noodles 12 measured by the micrometer by 1/2 is D2. It can be obtained by the following formula 4.
D1 = M−D2 (Formula 4)

Therefore, according to the determination method of the present invention, the noodles are subjected to a break test to determine the load-displacement curve of the noodles, the second derivative curve of the obtained load-displacement curve is obtained, and the minimum of the second derivative curve Find a quadratic function curve that approximates the part including the local maximum point closest to the point, and from the point where the quadratic function curve gives the local maximum value, determine the boundary between the swollen non-collapse region and the swollen collapse region of the noodles, The swollen non-disintegrating region of the noodles can be determined.
In addition, the ratio (R1 (%)) with respect to the cross-sectional area of noodles of a swelling non-disintegration area | region can be calculated | required from the following Formula 5 from D1 and D2.
R1 (%) = πD1 ² / πD2 ² × 100
= D1 ² / D2 ² × 100 (Formula 5)
The method for determining the swollen non-disintegrating region of the noodles of the present invention is basically configured as described above.

  In the example shown in FIG. 14, the cross-sectional shape of the noodles 12 is approximated to a circular shape in consideration of pasta and the like. However, the cross-sectional shape of the noodles to which the method of the present invention can be applied is not limited to this. As long as it is a real noodle, any cross-sectional shape of the noodles may be used. For example, noodles such as udon, somen, Chinese noodles, and Japanese soba noodles are not round as in pasta, but are almost rectangular or rectangular. Thus, also in the case of the bowl noodles whose cross-sectional shape can approximate a rectangle, the swollen collapse region and the swollen non-collapse region can be defined as in the case of the round bowl noodle 12 shown in FIG. That is, in the case of the bowl noodle 13 shown in FIG. 15, the swelling / disintegration region 13 a exists outside the bowl noodle 13, while the central part of the bowl noodle 13 has a rectangular shape substantially similar to the outer shape of the bowl noodle 13. It can be approximated that the swelling non-disintegrating region 13b exists.

Here, in the bowl-shaped noodles 13 shown in FIG. 15, if the right side 13c of the bowl noodles 13 is placed on the sample stage 18 and the left side 13d is the uppermost part, the plunger 20 shown in FIG. Since the tip part 20a of the first contact is first, the breaking direction is defined in the direction indicated by the arrow a.
Therefore, in the rectangular bowl 13 shown in FIG. 15, the distance between the right side 13c and the left side 13d of the bowl noodle 13 is such that the upper end and the lower end of the portion where the tip 20a of the plunger 20 shown in FIG. 14 and corresponds to the diameter PD of the circular bowl noodles 12 shown in FIG. 14, and therefore, the distance between the upper and lower ends of the broken portion can be defined by PD. The distance PD between the upper and lower ends of the fractured portion passes through the intersection (center) of the diagonal line of the rectangular cross section of the bowl noodles 13, and on the center line 13e parallel to the fracture direction a, the two sides 13c perpendicular to the fracture direction a and It can also be defined as the distance between 13d.

Similarly, corresponding to the radius D1 of the swelling non-disintegrating region 12b at the center of the circular bowl noodle 12 shown in FIG. 14, the rectangular bowl noodle 13 shown in FIG. Half of the distance between the upper end and the lower end of the collapse region 13b, that is, half of the distance between two sides perpendicular to the breaking direction a of the swelling non-disintegration region 13b at the center of the bowl noodle 13, or on the center line 13e The distance between the half of the length (distance) of the swollen non-collapse region 13b or the center and the side perpendicular to the breaking direction a of the swollen non-collapse region 13b can be defined as D1.
In addition, in the rectangular bowl noodle 13 shown in FIG. 15, corresponding to the radius D2 of the round bowl noodle 12 shown in FIG. 14, half of the distance PD between the upper and lower ends of the broken portion, that is, on the center line 13e. A half of the distance PD between the two sides 13c and 13d perpendicular to the breaking direction a of the crab noodle 13 can be defined as D2. Further, similarly to the case of the circular bowl noodles 12 shown in FIG. 14, the value M is defined on the center line parallel to the breaking direction a in the rectangular bowl noodles 13 shown in FIG. 15.

As described above, in the rectangular bowl 13 shown in FIG. 15, the distance PD between the upper and lower ends of the broken portion, the distance D2 that is half of this distance PD, and the distance between the upper end and the lower end of the swollen non-collapse region 13b at the broken portion. By defining the distance D1 and the value M which are half of the distance, the method for determining the swollen non-disintegration region of the noodles of the present invention described above can be applied as it is. A distance D1 that is half of the distance between the upper end and the lower end of the swollen non-collapsed region 13b at the break point representing the size of the non-collapsed region 13b can be obtained.
In addition, in the rectangular bowl noodles 13 shown in FIG. 15, except for the case where the cross-sectional shape is a square, the cross-sectional shape has anisotropy. Then, a fracture test is performed to determine distance PD ′, distance D2 ′, value M ′, and distance D1 ′ corresponding to distance PD, distance D2, value M, and distance D1, respectively.
By using the distance D1 and distance D2 thus obtained, the distance D1 ′ and the distance D2 ′, instead of the above formula 5, the following formula 9 is defined, whereby the ratio of the swollen non-collapsed area to the cross-sectional area of the noodle ( R1 (%)) can be obtained.
R1 (%) = D1 × D1 ′ / (D2 × D2 ′) × 100
= 100 × D1 × D1 ′ / (D2 × D2 ′) (Formula 9)

Thus, the method for determining the swollen non-disintegrating region of the noodles of the present invention can also be applied to the rectangular noodles 13 shown in FIG.
In addition, the method for determining the swollen non-disintegration region of the crab noodles of the present invention is not limited to the circular or rectangular crab noodles described above, but also to crab noodles having an arbitrary cross-sectional shape such as an elliptical shape or a polygonal shape. Applicable. Thus, in the case of crab noodles of any cross-sectional shape, if the cross-sectional shape can be approximated to the circular shape or rectangular shape described above, the method described above may be applied as it is, Applying the method of the present invention with all of the length (distance) directions necessary to obtain the cross-sectional area of the noodles and their swollen non-disintegrating regions as the breaking direction, that is, performing the breaking test described above, and each breaking direction All the distances D1 and D2 in the above are obtained, and using them, the ratio (R1 (%)) of the swollen non-disintegrating region to the cross-sectional area of the noodles may be obtained.

  As described above, the method for determining the swollen non-disintegration region of the noodles according to the present invention has been described in detail. However, the present invention is not limited to the above-described embodiment, and various improvements and changes can be made without departing from the spirit of the present invention. Of course, you can change the design. For example, the method of the present invention is applicable not only to udon and pasta mainly made of wheat flour, but also to samen, Chinese noodles, Japan, etc. It can be applied to various noodles such as buckwheat.

  Next, examples are given to more specifically describe the method for determining the swollen non-disintegration region of the noodles of the present invention, but the present invention is not limited to only the following examples.

Example 1
With respect to pasta noodles obtained by boiling 1.7 mm diameter pasta dry noodles (“Select” manufactured by Nisshin Foods Co., Ltd.) in boiling water for 8 minutes in the determination system 10 shown in FIG. The test was conducted. In addition, this pasta crab noodle has a cross-sectional shape that can be approximated by the cross-sectional shape of the crab noodle 12 shown in FIG.
Breaking tester 14: Small desktop testing machine EZ Test-20N (manufactured by Shimadzu Corporation)
Plunger 20: Triangular (V) type plunger: 1 mm width of the tip 20a
Movement speed of plunger 20: 30 mm / min Plotting software of curve creating means 26: SHIKIBU rheometer (Shimadzu Corporation)
Made)
Differential calculation software for secondary differential means 28: unscrambler (manufactured by CAMO)
Number of measurements: 15 times

The average value of the measurement results thus obtained is shown in Table 1 below.
FIG. 7 is a load-displacement curve obtained by plotting the results of Table 1.

Table 2 shows the result of first-order differentiation of the load-displacement curve shown in FIG. 7 obtained from the results of Table 1 thus obtained.
FIG. 8 is a first derivative curve of a load-displacement curve obtained by plotting the results of Table 2.

  Table 3 shows results obtained by further differentiating the primary differential curve of the load-displacement curve shown in FIG. 8 obtained from the results of Table 2 thus obtained, that is, results of secondary differentiation of the load-displacement curve shown in FIG. . FIG. 9 is a second derivative curve of the load-displacement curve obtained by plotting the results of Table 3.

In FIG. 9, a point m was obtained as a local maximum point closest to the minimum point C of the secondary differential curve.
The vicinity of the point m in FIG. 9 was approximated by a quadratic function as follows.
FIG. 10 shows data obtained by picking up three points of data near the point m in FIG. 9 and connecting them with straight lines. FIG. 11 is a quadratic function curve approximating the straight line connecting the three points in FIG.

The curve in FIG. 11 could be expressed by a quadratic function expression of the following expression 6.
y = −150.19x ² + 492.27x + 402.26 (Expression 6)
Here, when the above equation 6 is differentiated, the following equation 7 is obtained.
dy / dx = −300.38x + 492.27 (Expression 7)
Thus, y gives a maximum point when dy / dx = 0, and when the value of x at that time is found,
M = 1.64 (mm).

Moreover, since the average value of the diameter of the noodles measured 15 times with the micrometer was 2.40 mm, the radius D2 of the noodles was 1.20 mm.
From the value M and the radius D2, when determining the radius D1 (mm) of the swollen non-collapse region of the noodles,
D1 = 0.44 (mm).

  Therefore, the noodles are subjected to a break test to determine the load-displacement curve of the noodles, the second derivative curve of the obtained load-displacement curve is obtained, and the maximum point closest to the minimum point of the second derivative curve is included. A quadratic function curve that approximates the part is obtained, and from the point that gives the maximum point of the quadratic function curve, the boundary between the swollen non-collapse region and swollen disintegration region of crab noodles can be obtained, and the swollen non-collapse of crab noodles The radius of the region can be obtained.

In addition, from the radii D1 and D2, using the above formula 5, when determining the ratio (R1 (%)) to the cross-sectional area of the swollen non-disintegrating region,
R1 (%) = D1 ² / D2 ² × 100
= 13.35 (%).

(Examples 2 to 4)
A compression rupture test was carried out under the same conditions as in Example 1 except that the boiled time of 1.7 mm diameter pasta dry noodle used in Example 1 was changed to the time shown in Table 4 below.
From each measurement result, the radius D1, the radius D2, the value M, and the ratio R1 are obtained in the same manner as in Example 1, and the results including Example 1 are expressed as shown in Table 5 below.

As a result, the boundary between the swollen collapse region and the swollen non-collapse region of the crab noodle can be obtained based on the load-displacement curve created by subjecting the crab noodle to the breaking test. It was confirmed that it can be used as a judgment method.
In addition, it was also confirmed that the ratio of the swollen non-disintegrating region of the noodles to the cross-sectional area of the noodles was reduced as the cooking time increased.

(Reference example)
Using the determination method of the swollen non-disintegrating region using MRI shown in Non-Patent Document 1, the swollen non-disintegrating region of crab noodles was determined.
Here, a method for determining the swollen non-disintegrating region of the noodles using MRI will be briefly described.
When using MRI, the distance from the center of the noodles and the water content at that position can be measured. When the distance from the noodle center is plotted on the horizontal axis and the water content is plotted on the vertical axis, the amount of change in moisture per unit distance (moisture gradient) decreases at a certain distance. The point where the moisture gradient is reduced is the boundary between the swollen non-collapse region / swelling disintegration region. FIG. 12 shows an example of the moisture content measurement result using MRI.

The distance from the center of the point where the moisture gradient decreases is the radius of the swollen undisintegrated region. This is D3 (mm). Moreover, let the radius of the noodles obtained by multiplying the diameter of the noodles measured with a micrometer by 1/2 be D4 (mm).
From the radii D3 and D4, the ratio (R2 (%)) of the swollen non-collapsed region to the cross-sectional area of the noodle, which is an index for determining the swollen non-collapsed region, can be obtained by the following formula 8.
R2 (%) = πD3 ² / πD4 ² × 100
= D3 ² / D4 ² × 100 (Equation 8)

(Reference Examples 1-4)
About the same pasta noodles boiled on the same conditions as Examples 1-4, the MRI analysis was performed as follows.
MRI: DRX300WB (manufactured by Bruker)
Analysis software: ParaVision (manufactured by Bruker)
Number of measurements: 4 times Table 6 shows the average values of radius D3, radius D4, and ratio R2 obtained from the measurement results.

(Comparison of judgment results of Examples and Reference Examples)
The ratio (R1 (%)) of the swollen non-disintegration region of Examples 1 to 4 to the cross-sectional area of the crab noodle and the ratio of the swollen non-disintegration region of Reference Examples 1 to 4 to the cross-sectional area of the crab noodle (R2 (%)) As a result of linear regression analysis, the correlation coefficient (R ² ) showed a very high value of 0.9991.
Here, the ratio R1 of Examples 1 to 4 and the ratio R2 of Reference Examples 1 to 4 are shown in FIG. FIG. 13 is a graph showing the correlation between the ratio R1 of Examples 1 to 4 and the ratio R2 of Reference Examples 1 to 4.
As a result, the results obtained by the method of judging the swollen non-disintegration region of the noodles from the load-displacement curve using a break test machine are the same as the results obtained by the method of analyzing using MRI. It was confirmed that the accuracy was of a certain degree.

It is a schematic diagram which shows one Embodiment of the determination system of the swelling non-disintegration area | region of the strawberry noodle which enforces the determination method of the swelling non-disintegration area | region of the strawberry noodles of this invention. It is a graph of an example of the load-displacement curve obtained in this invention method. It is a graph of the 1st derivative result of the load-displacement curve shown in FIG. It is a graph of the second derivative result of the load-displacement curve shown in FIG. 5 is a graph obtained by connecting three points picked up in the vicinity of the maximum point A of the second-order differential curve shown in FIG. 6 is a graph showing a result obtained by approximating a straight line connecting three points shown in FIG. 5 with a quadratic function curve. It is a graph of the load-displacement curve obtained by plotting the result of Table 1 obtained in Example 1 of this invention method. It is a graph of the primary differential curve of the load-displacement curve obtained by plotting the result of Table 2 obtained in Example 1. FIG. It is a graph of the secondary differential curve of the load-displacement curve obtained by plotting the result of Table 3 obtained in Example 1. FIG. 10 is a graph obtained by connecting three points picked up in the vicinity of the maximum point m of the secondary differential curve shown in FIG. 9 with straight lines. It is a graph of the quadratic function curve which approximated the straight line which connects 3 points | pieces shown in FIG. It is a graph which shows an example of the moisture content measurement result using the conventional MRI. It is a graph which shows the correlation of ratio R1 of an Example, and ratio R2 of a reference example. It is sectional drawing which shows an example of the cross section of crab noodles typically. It is sectional drawing which shows the other example of the cross section of crab noodles typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Judgment system of swollen non-disintegration area | region 12,13 Crab noodles 12a, 13a Swelling disintegration area | region 12b, 13b Swelling non-disintegration area | region 14 Break tester 16 Computation processing system 18 Horizontal sample stand 20 Plunger 20
20a Tip portion 22 Load meter 24 Drive system 26 Curve creation means 28 Secondary differentiation means 30 Function approximation means 32 Area determination means a, b Break direction

Claims (2)

A compression test of crab noodles was performed with a break tester, and the penetration distance from the crab noodle outer edge of the plunger tip of the break tester measured as a displacement, and the plunger from the crab noodle measured corresponding to the displacement Plot the load to obtain the load-displacement curve of the noodles,
Second-order differentiation of the obtained load-displacement curve,
Approximate the part including the maximum point closest to the minimum point of the obtained second derivative curve with a quadratic function,
The resulting quadratic function curve determination method of swelling-collapse region of茹麺, characterized in that to determine the swelling-collapse region of the茹麺from the viewpoint of giving the maximum value of. The load-displacement curve of the crab noodle performs the compression test, measures the penetration distance from the crab noodle outer edge of the plunger tip of the breaker as a displacement, and measures the load applied from the crab noodle to the plunger. The method according to claim 1, wherein the determination is made by plotting the displacement and the load corresponding to the displacement.

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