Method for testing Q degree of mochi through twice stretching by using texture analyzer

Abstract

The invention relates to the technical field of food texture analysis, and provides a method for testing Q degree of mochi through twice stretching by using a texture analyzer, the mochi is fixed on a testing device, then twice stretching experiments are performed on the mochi according to set parameters, and the elasticity of the mochi is obtained through first stress relaxation stretching; the Q-degree characteristics of the mochi, which are measured by the second destructive test, comprise the bite-off force and the bite-off displacement, can be specifically tested aiming at various Q elastic foods, and then the sample is stretched twice by using a physical property tester according to the set experimental parameters. Two kinds of test data can be obtained, calculation is carried out through a single graph, the time for replacing a sample is saved, two kinds of experiments can be completed at a time through the same sample, data influences caused by different samples are avoided, time, labor and materials are saved, and the maximum efficiency of detection is achieved; the problems of inaccurate mochi Q degree determination and low test efficiency in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of food texture analysis, in particular, to a method for testing the Q degree of sticky rice cake using a texture analyzer twice. BACKGROUND

[0002] The taste of sticky rice cake or sticky rice is soft but not easy to bite, slightly elastic but also extensible, with compressible and stretchable texture characteristics. We often describe the processing product of waxy starch as Q elastic. Elasticity is the ratio of compression or stretching energy to recovery energy, and has a clear physical index, but it cannot describe the range of soft and not easy to bite. Q plays a crucial role in the description of taste. Minnan Pinyin: khiū, as a description of food taste, originally exists in traditional dictionaries, not foreign language. Nowadays, people replace it with the English letter Q, which describes the taste characteristics of sticky rice and other waxy starch foods such as soft and chewy, elastic and stretchy. This characteristic is due to the high proportion of amylopectin in waxy starch, which forms a dendritic molecular network structure, giving the food a soft and not easy to break, elastic and stretchy extensibility. However, the existing technology has defects in the determination method of sticky rice Q degree, and it is difficult to accurately distinguish and evaluate the elasticity and Q degree characteristics. Therefore, it is necessary to put forward an innovative test method to separate the definition and test of Q and elastic, so as to more accurately evaluate the Q elastic characteristics of sticky rice and realize the quantitative description of taste characteristics.

[0003] In the prior art, the determination of sticky rice Q degree usually adopts a single tensile test method, and Q and elastic are often combined to define and test. This method has many defects. First of all, because Q and elastic are combined, the prior art cannot accurately distinguish and evaluate the elasticity and Q degree characteristics of sticky rice. A single tensile test can only obtain destructive Q degree data, i.e. the mechanical performance when the sticky rice is pulled apart, and cannot obtain non-destructive elastic data, i.e. the recovery ability of the sticky rice when it is subjected to a small deformation. Therefore, the prior art cannot comprehensively and accurately evaluate the Q elastic characteristics of sticky rice, which limits the in-depth understanding and application of mechanical characteristics. Secondly, the test process in the prior art is usually complicated, which requires multiple sample changes and repeated tests, not only consuming a lot of time and manpower, but also possibly leading to inconsistency and error of data. In addition, due to the lack of accurate and flexible test parameters, the prior art often cannot conduct targeted tests on different types of sticky rice, which further affects the accuracy and reliability of the determination results. Therefore, it is necessary to put forward an innovative test method to separate the definition and test of Q and elastic, so as to more accurately evaluate the Q elastic characteristics of sticky rice and simplify the test process, improve the test efficiency and accuracy. SUMMARY

[0004] The application provides a method for testing the Q degree of hemp shive by using a texture analyzer twice, and solves the problems of inaccurate Q degree determination and low test efficiency of hemp shive in the related art.

[0005] The technical scheme of the application is as follows:

[0006] A method for testing the Q degree of hemp shive by using a texture analyzer twice, comprising the following steps:

[0007] Step S1: setting the parameters of the texture analyzer, including the mode and speed of twice different deformation tensile tests, and adapting to the hemp shive sample to be measured;

[0008] Step S2: placing the hemp shive sample on a tray and fixing it;

[0009] Step S3: performing the first small deformation tensile test, observing the stress relaxation, and determining the elasticity of the hemp shive;

[0010] Step S4: in the second large deformation tensile test, setting the displacement target mode as 50 mm, and the rest of the test speed and trigger mode being the same as those in the first small deformation tensile test;

[0011] Step S5: monitoring and recording the force value change curve in real time during the tensile process;

[0012] Step S6: calculating the elasticity and Q degree parameters of the hemp shive according to the curve data.

[0013] As a preferred scheme of the application, in step S1, the parameters of the texture analyzer are set, including the mode and speed of twice different deformation tensile tests, and the specific steps of adapting to the hemp shive sample to be measured are as follows:

[0014] (1) according to the type of the hemp shive sample to be measured, setting the test mode as twice different deformation tensile, the first being small deformation tensile and the second being large deformation tensile;

[0015] (2) setting the test speed, including the test speed range of 1.00-3.00 mm / s before the test, the test speed range of 2.00-4.00 mm / s during the test, and the test speed range of 5.00-15.00 mm / s after the test.

[0016] As a preferred scheme of the application, in step S2, the specific steps of placing the hemp shive sample on a tray and fixing it are as follows:

[0017] (1) selecting a hemp shive sample with a suitable size;

[0018] (2) placing the hemp shive sample on a sample tray and fixing it by using a clamp, so as to ensure the position stability of the hemp shive sample during the test.

[0019] As a preferred scheme of the present application, in the step S3, the first small deformation tensile test is performed, the stress relaxation is observed, and the specific steps for measuring the elasticity of the hemp dough are as follows:

[0020] (1) The pre-test speed range is set to 1.00-3.00 mm / s, the test speed range is set to 2.00-4.00 mm / s, and the post-test speed range is set to 5.00-15.00 mm / s;

[0021] (2) The tensile test is performed, the tensile interval is set to 0.5-2.0 mm, and the stress relaxation is observed and recorded, so as to measure the elasticity of the hemp dough.

[0022] As a preferred scheme of the present application, in the step S4, in the second large deformation tensile test, the displacement target mode is set to 50 mm, and the specific steps for setting the remaining test speed and trigger mode to be the same as those in the first small deformation tensile test are as follows:

[0023] (1) The pre-test speed range is set to 1.00-3.00 mm / s, the test speed range is set to 2.00-4.00 mm / s, and the post-test speed range is set to 5.00-15.00 mm / s;

[0024] (2) The displacement target mode is set to 50 mm, the tensile test is performed until the hemp dough sample is broken, the breaking displacement, the breaking force, and the breaking work data are recorded, and the Q degree of the hemp dough is measured.

[0025] As a preferred scheme of the present application, in the step S5, the specific steps for monitoring and recording the force value change curve in the tensile process in real time are as follows:

[0026] (1) The force value monitoring function of the texture tester is started;

[0027] (2) The curve data of the force value change with time during the tensile test is recorded in real time.

[0028] As a preferred scheme of the present application, in the step S6, the specific steps for calculating the elasticity and Q degree parameters of the hemp dough according to the curve data are as follows:

[0029] (1) The stress relaxation ratio is calculated according to the stress relaxation curve of the first small deformation tensile test, and the elasticity parameter of the hemp dough is obtained;

[0030] (2) The Q degree parameter of the hemp dough is calculated according to the breaking displacement, the breaking force, and the breaking work data of the second large deformation tensile test.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] 1. This invention, by setting two different deformation stretching test modes, performing small deformation stretching and large deformation stretching respectively, can comprehensively evaluate the Q-elasticity characteristics of mochi. By precisely controlling the test speed range, selecting appropriate mochi samples, and monitoring the force value change over time curve data in real time during the stretching process, this invention can accurately determine the elasticity parameters and Q-degree parameters of mochi. Compared with the traditional single stretching test method, this invention obtains both non-destructive elasticity data and destructive Q-degree data through two stretching experiments, thus achieving the effect of accurate determination of mochi Q-degree.

[0033] 2. This invention, by employing a method of testing samples through two stretching tests, can simultaneously obtain destructive and non-destructive data in a single experiment, effectively saving time spent on sample replacement and repeated testing. Furthermore, by monitoring the force value over time in real time, the elasticity and Q-degree parameters of the mochi can be quickly analyzed, further improving testing efficiency. Compared to traditional testing methods, this invention not only reduces testing steps and manpower input but also avoids data errors caused by different samples, thereby achieving a significant improvement in testing efficiency. Attached Figure Description

[0034] Figure 1 The following are molecular formula diagrams of amylopectin and amylose according to the present invention;

[0035] Figure 2 These are test diagrams for the four methods of this invention;

[0036] Figure 3 This is a trend graph of the hardness testing method of the present invention;

[0037] Figure 4 This is a trend chart of the elasticity testing method of the present invention;

[0038] Figure 5 This is a trend chart of the Q-degree testing method of the present invention. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] The embodiment provides a method for testing Q degree of hemp shive by using a texture analyzer twice, which comprises the following steps: setting a test mode as twice different deformation stretching according to the type of the hemp shive sample to be tested, setting a test speed, selecting a hemp shive sample with a proper size, placing the hemp shive sample on a sample tray and fixing the hemp shive sample by using a clamp, ensuring that the position of the hemp shive sample is stable during the test, setting a test speed, setting a displacement target mode, stretching, setting a stretching interval, keeping for a period of time, observing and recording stress relaxation, setting a test speed, setting a displacement target mode, recording a biting displacement, biting force and biting work data, starting a force value monitoring function of the texture analyzer, recording curve data of the force value changing with time in real time during the stretching test, calculating a stress relaxation ratio according to a stress relaxation curve of the first small deformation stretching test, obtaining an elasticity parameter of the hemp shive, and calculating a Q degree parameter of the hemp shive according to the biting displacement, the biting force and the biting work data of the second large deformation stretching test.

[0042] In the embodiment, first, experimental parameters of the texture analyzer are set according to the type of the hemp shive sample to be tested, the parameters comprising a test mode, a test speed and a test interval, in particular, the test mode is set as twice different deformation stretching, the first time is small deformation stretching, and the second time is large deformation stretching, and the setting is aimed at more comprehensively revealing mechanical properties of the hemp shive.

[0043] In terms of the test speed, the test is finely divided according to different stages, the test speed before the test is set as 2.00 mm / s, the test head is ensured to stably approach the hemp shive sample, the test speed is increased to 3.00 mm / s to quickly and accurately apply deformation, the test speed after the test is set as 10.00 mm / s to quickly complete the test and prepare for the next stretching, and the test interval is different according to different stretching types, the target mode is set as displacement 0.5 mm when the small deformation stretching is performed, and the target mode is set as displacement 50 mm when the large deformation stretching is performed.

[0044] In terms of sample preparation, select the appropriate size of hemp sample, place it on the sample tray, and use the clamp to fix it, so that the position of the hemp sample is stable during the test and does not move or fall off. During the test, the hemp sample is subjected to two stretching tests according to the set experimental parameters. During the stretching process, the trigger mode is set to 5 grams of force, that is, when the test head exerts a force of 5 grams on the sample, the data recording begins, and the texture analyzer monitors and records the force-time curve data in real time.

[0045] In addition, when applied to the test of hemp, special attention is paid to the different purposes of the two stretching tests. The first stretching and holding for a distance is mainly to obtain the elastic properties of hemp, that is, its recovery ability when subjected to small deformation, while the second stretching to break the hemp is to further explore the Q degree of hemp, that is, its performance when subjected to large deformation. Such test design enables more accurate evaluation of the Q elastic properties of hemp. A cycle waiting time of 5 seconds is set between the two stretching tests to ensure that the test head can return to the initial position and prepare for the next stretching. This step is crucial to ensure the accuracy and repeatability of the test results.

[0046] In the data analysis stage, the Q elastic properties of hemp are comprehensively analyzed based on the curve data generated by the two stretching tests. First, observe the stress relaxation curve of the first small deformation stretching test, calculate the stress relaxation ratio, and obtain the elastic parameters of hemp. This step helps to understand the recovery ability of hemp when subjected to small deformation. Then, the curve data of the second large deformation stretching test are analyzed in depth, including bite displacement, bite force, and bite work, etc. These parameters can reflect the performance of hemp when subjected to large deformation and more comprehensively evaluate the Q degree.

[0047] It should be noted that, compared with the prior art, the present embodiment has innovation in defining the Q and elastic properties of hemp. The prior art often combines the Q and elastic properties of hemp, lacks clear distinction and detailed exploration, and the present method breaks this inertia thinking and defines Q and elastic separately to more accurately evaluate the mechanical properties of hemp. Through the test method of two different deformation stretching, the elastic and Q degree parameters of hemp are obtained. The first stretching test mainly focuses on the recovery ability of hemp when subjected to small deformation, that is, its elastic properties, while the second stretching test focuses on the performance of hemp when subjected to large deformation, that is, its Q degree properties. This separate definition method enables us to more deeply understand the mechanical properties of hemp and provides more accurate and comprehensive basis for product research and development and quality control.

[0048] Example 2

[0049] Based on the same concept as in Embodiment 1, this embodiment also proposes a method for measuring the Q degree of hemp shive using a texture analyzer, including setting the test mode to two different deformation stretches, the first being a small deformation stretch and the second being a large deformation stretch, setting the test speed, including a pre-test speed range of 2.00 mm / s, a test speed range of 3.00 mm / s, and a post-test speed range of 10.00 mm / s, selecting a hemp shive sample of appropriate size, placing the hemp shive sample on the sample tray and fixing it using the clamp, ensuring the position of the hemp shive sample is stable during the test, setting the pre-test speed range to 2.00 mm / s, the test speed range to 3.00 mm / s, and the post-test speed range to 10.00 mm / s, performing the stretch, setting the stretch distance to 1.3 mm and maintaining it for a period of time, observing and recording the stress relaxation, measuring the elasticity of the hemp shive, setting the pre-test speed range to 2.00 mm / s, the test speed range to 3.00 mm / s, and the post-test speed range to 10.00 mm / s, setting the displacement target mode to 50 mm, performing the stretch until the hemp shive sample is broken, recording the break displacement, break force, and break work data, measuring the Q degree of the hemp shive, starting the force monitoring function of the texture analyzer, recording the force-time curve data in real time during the stretch test, calculating the stress relaxation ratio according to the stress relaxation curve of the first small deformation stretch test, obtaining the elasticity parameters of the hemp shive, and calculating the Q degree parameters of the hemp shive according to the break displacement, break force, and break work data of the second large deformation stretch test.

[0050] In this embodiment, the test mode is set to two different deformation stretches, the first being a small deformation stretch and the second being a large deformation stretch. This test mode design aims to more comprehensively reveal the mechanical response of hemp shive under different deformation conditions. In terms of test speed, a fine division is also made, with the pre-test speed set to 2.00 mm / s to ensure that the test head approaches the hemp shive sample smoothly and slowly, avoiding impact on the sample, the test speed is then increased to 3.00 mm / s for rapid and accurate deformation, obtaining the mechanical data of hemp shive during deformation, and the post-test speed is set to 10.00 mm / s to quickly complete the test and prepare for the next stretch, improving test efficiency.

[0051] In terms of test interval, corresponding adjustments are made according to the different types of stretching. For small deformation stretching, the target mode is set to displacement 1.3 mm to explore the mechanical properties of hemp dough under smaller deformation. For large deformation stretching, the target mode is set to displacement 50 mm to further understand the performance of hemp dough under larger deformation. In terms of sample preparation, hemp dough samples of appropriate size are selected to ensure that they can completely fill the test area. Then, the hemp dough samples are placed on the sample tray and fixed using clamps to ensure that the position of the hemp dough samples is stable during the test and does not move or slip, thereby ensuring the accuracy and reliability of the test results.

[0052] During the test, the hemp dough samples are subjected to two stretching tests according to the set experimental parameters. During the stretching process, the trigger mode is set to force 5 grams, i.e., when the force applied by the test head to the sample reaches 5 grams, the test instrument starts recording data, which ensures that the mechanical changes of hemp dough during deformation can be captured at the right time.

[0053] In addition, special attention is paid to the different purposes of the two stretching tests. The first stretching and holding for a certain distance are mainly to obtain the elastic properties of hemp dough, and the stress relaxation of hemp dough during the holding stage is observed and recorded. By calculating the stress relaxation ratio, the elastic parameters of hemp dough are obtained. This step helps to understand the recovery ability of hemp dough under smaller deformation. The second stretching breaks the hemp dough to further explore the Q degree of hemp dough. The bite displacement, bite force, and bite work are recorded. These parameters can reflect the performance of hemp dough under larger deformation. Through the analysis of these parameters, the Q degree characteristics of hemp dough can be more comprehensively evaluated.

[0054] Between the two stretching tests, the cycle waiting time is set to 5 seconds to ensure that the test head can return to the initial position and prepare for the next stretching. This step is crucial to ensure the accuracy and repeatability of the test results. In the data analysis stage, the curve data generated by the two stretching tests are comprehensively analyzed. First, the stress relaxation curve of the first small deformation stretching test is observed. By calculating the stress relaxation ratio, the elastic parameters of hemp dough are obtained. This step helps to further understand the mechanical properties of hemp dough under smaller deformation. Then, the curve data of the second large deformation stretching test are analyzed in depth, including bite displacement, bite force, and bite work. Through the analysis and calculation of these parameters, the Q degree parameters of hemp dough are obtained, thereby more comprehensively evaluating its Q elastic properties.

[0055] Through the test method of this embodiment, the elasticity and Q degree of hemp dough are successfully defined separately, and accurate evaluation results are obtained. This method not only enriches the understanding of the mechanical properties of hemp dough, but also provides strong support for product research and quality control.

[0056] Example 3

[0057] Based on the same concept as in Example 1 above, this embodiment also proposes a method for measuring the Q degree of hemp shive using a texture analyzer, including setting the test mode to two different deformation stretches according to the type of hemp shive sample being tested, the first being a small deformation stretch and the second being a large deformation stretch, setting the test speed, including a pre-test speed range of 3.00 mm / s, a test speed range of 4.00 mm / s, and a post-test speed range of 15.00 mm / s, selecting a suitable size of hemp shive sample, placing the hemp shive sample on the sample tray and fixing it using the clamp to ensure the position of the hemp shive sample is stable during the test, setting the pre-test speed range to 3.00 mm / s, the test speed range to 4.00 mm / s, and the post-test speed range to 15.00 mm / s, performing the stretch with a stretch interval of 2.0 mm and maintaining it for a period of time, observing and recording the stress relaxation, measuring the elasticity of the hemp shive, setting the pre-test speed range to 3.00 mm / s, the test speed range to 4.00 mm / s, and the post-test speed range to 15.00 mm / s, setting the displacement target mode to 50 mm, performing the stretch until the hemp shive sample is broken, recording the break displacement, break force, and break work data, measuring the Q degree of the hemp shive, starting the force monitoring function of the texture analyzer, and recording the curve data of the force value changing with time in real time during the stretch test, calculating the stress relaxation ratio according to the stress relaxation curve of the first small deformation stretch test to obtain the elasticity parameter of the hemp shive, and calculating the Q degree parameter of the hemp shive according to the break displacement, break force, and break work data of the second large deformation stretch test.

[0058] In this embodiment, first, the test mode of two different deformation stretches, i.e., small deformation stretch and large deformation stretch, is set according to the type of hemp shive sample being tested, and the test speed range is also adjusted, including a pre-test speed of 3.00 mm / s, a test speed of 4.00 mm / s, and a post-test speed of 15.00 mm / s, a suitable hemp shive sample is selected and fixed on the sample tray to ensure its position is stable, in the first small deformation stretch, the stretch interval is set to 2.0 mm, the stress relaxation is observed and recorded to measure the elasticity of the hemp shive, then the second large deformation stretch is performed with a displacement target mode of 50 mm until the hemp shive sample is broken, the break displacement, break force, and break work data are recorded to measure the Q degree of the hemp shive, and the curve data of the force value changing with time is recorded in real time during the test to provide a basis for subsequent analysis, and the elasticity parameter and Q degree parameter of the hemp shive can be calculated according to the curve data of the two stretches;

[0059] The embodiment adopts twice stretching to test the sample, can obtain the data of destruction and non-destruction at the same time, thereby obtaining the test effect and saving the test time and manpower.

[0060] The mechanical property parameters of different proportion of the dough are shown in Table 1:

[0061] Table 1

[0062] Sample Elasticity / % Gnawing force / g Gnawing displacement / mm Gnawing work / g.sec 100% waxy rice flour 31.53 21.43 11.17 84.60 75% waxy rice flour 22.13 12.47 9.69 57.79 50% waxy rice flour 15.17 8.07 6.32 31.94 25% waxy rice flour 9.96 11.53 5.49 27.88

[0063] In summary, the embodiment sets the experimental parameters of the physical property tester according to the types of the measured sample, can perform targeted test on various Q elastic food, then uses the physical property tester to perform twice stretching on the sample according to the set experimental parameters, and monitors the curve of the force value change of the measured sample in the test process in real time, finally quantifies the Q elastic properties of the dough according to the curve data, thereby qualitatively and quantitatively obtains the Q degree and elasticity of the dough.

[0064] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for testing the Q degree of a dough ball using a texture analyzer with two stretching tests, characterized in that, The method comprises the following steps: Step S1: setting the parameters of the physical property tester, including two different deformation tensile test modes and speeds, and adapting to the specific steps of the measured hemp pulp sample as follows: (1) According to the type of the measured hemp pulp sample, set the test mode to two different deformation tensile tests, the first small deformation tensile test and the second large deformation tensile test; (2) Set the test speed, including the test speed range of 1.00-3.00 mm / s before the test, the test speed range of 2.00-4.00 mm / s during the test, and the test speed range of 5.00-15.00 mm / s after the test. In step S2, the specific steps of placing the hemp pulp sample on the tray and fixing it are as follows: (1) Select a hemp pulp sample of appropriate size; (2) Place the hemp pulp sample on the sample tray and fix it using a clamp to ensure the stability of the position of the hemp pulp sample during the test.

2. The method of claim 1, wherein the two tensile tests are performed using a texture analyzer. In step S3, the specific steps of the first small deformation tensile test, observing the stress relaxation, and measuring the elasticity of the hemp pulp are as follows: (1) Set the test speed range to 1.00-3.00 mm / s before the test, 2.00-4.00 mm / s during the test, and 5.00-15.00 mm / s after the test; (2) Perform the tensile test with a stretch distance of 0.5-2.0 mm and maintain for a period of time, observe and record the stress relaxation, and measure the elasticity of the hemp pulp.

3. The method of claim 1, wherein the two tensile tests are performed using a texture analyzer. In step S4, in the second large deformation tensile test, the specific steps of setting the displacement target mode to 50 mm, and the rest of the test speed and trigger mode being the same as the first small deformation tensile test are as follows: (1) Set the test speed range to 1.00-3.00 mm / s before the test, 2.00-4.00 mm / s during the test, and 5.00-15.00 mm / s after the test; (2) Set the displacement target mode to 50 mm, perform the tensile test until the hemp pulp sample is broken, record the breaking displacement, breaking force, and breaking work data, and measure the Q degree of the hemp pulp.

4. The method of claim 1, wherein the two tensile tests are performed using a texture analyzer. In step S5, the specific steps of real-time monitoring and recording the force value change curve during the tensile process are as follows: (1) Start the force value monitoring function of the physical property tester; (2) During the tensile test, record the curve data of the force value changing with time in real time.

5. The method of claim 1, wherein the two tensile tests are performed using a texture analyzer. In step S6, the specific steps of calculating the elasticity and Q degree parameters of the hemp pulp according to the curve data are as follows: ​ ​ 6. The method of claim 1, wherein the two tensile tests are performed using a texture analyzer. ​ ​ ​ 7. The method of claim 1, wherein the two tensile tests are performed using a texture analyzer. ​ (1) According to the stress relaxation curve of the first small deformation tensile test, the stress relaxation ratio is calculated, and the elastic parameters of the hemp meal are obtained; (2) According to the bite displacement, bite force and bite work data of the second large deformation tensile test, the Q degree parameters of the hemp meal are calculated.

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