A medium-strength, low-glycemic index wheat flour and its characteristics

Abstract

The application discloses a medium-strength medium-low glycemic index wheat flour and belongs to the technical field of food. The wheat flour is prepared from medium-strength wheat through a pure physical annealing process and meets the following characteristics: the wet gluten content is greater than or equal to 26% and less than or equal to 30%, the GI value is less than or equal to 60, the RS3 type resistant starch content is greater than or equal to 8%, the RS3 type resistant starch melting temperature is greater than or equal to 120 DEG C, the farinograph water absorption is greater than or equal to 55%, the stability time is greater than or equal to 5 minutes, the area of the extension is greater than or equal to 60 cm2, and the ingredient table only contains the wheat flour. The medium-strength medium-low GI wheat flour of the application retains the unique processing performance of the medium-strength wheat flour, significantly reduces the glycemic index, and is suitable for making Chinese pastry products such as sugar-controlled steamed buns, steamed stuffed buns and dumpling wrappers.

Description

Technical Field

[0001] This invention belongs to the field of food technology, specifically relating to a wheat flour that is produced by a purely physical annealing process and possesses both medium gluten properties and a low to medium glycemic index. Background Technology

[0002] Medium-gluten wheat flour is the core ingredient for making Chinese steamed buns, dumplings, noodles, and other traditional Chinese pastries. Its gluten content and strength fall between high-gluten and low-gluten wheat flour, possessing both a certain ability to form a gluten network and good extensibility. Traditional medium-gluten wheat flour typically has a glycemic index (GI) between 70 and 80, classifying it as a high-GI food. For consumers who need to control their post-meal blood sugar, medium-gluten wheat flour products—steamed buns, dumplings, and baozi—are the most difficult to give up yet the most important to control in their daily diet. In existing technologies, methods to reduce the GI value of wheat flour mainly include adding exogenous ingredients such as dietary fiber and resistant starch. While these methods can lower the GI value of the product, the added exogenous ingredients weaken the gluten network structure, resulting in smaller steamed buns, harder dumpling skins, and reduced extensibility of dumpling skins. For medium-gluten wheat flour, processing performance is a core quality indicator—the flour must be able to form a gluten network of appropriate strength to ensure that steamed buns are fluffy, dumpling skins are soft, and dumpling skins are not easily broken. The applicant's earlier patent application 2026108480391 discloses a general modification method for medium-gluten wheat flour that balances gluten content and blood sugar reduction. This process can reduce the GI value of the product while retaining the processing performance of medium-gluten wheat flour. This invention, based on this prior process, further optimizes the matching of annealing temperature and annealing time to obtain a product that, for the first time, defines a medium-gluten, low-GI wheat flour product that simultaneously satisfies medium-gluten characteristics and low-to-medium GI features. Its quality is comprehensively defined through seven quantitative indicators: wet gluten content range, GI value, RS3 content, RS3 melting temperature, flour water absorption rate, stability time, and stretching area. Summary of the Invention

[0003] Purpose of the invention This invention provides a wheat flour product that is produced through a purely physical annealing process and possesses both medium gluten properties and a low to medium glycemic index. Its quality is fully defined by seven quantitative indicators. Technical solution This product uses medium-gluten wheat as raw material and is prepared using the general modification method for medium-gluten wheat flour that balances gluten strength and blood sugar reduction, as described in patent application No. 2026108480391. A GI value ≤ 60 is achieved through optimized matching of annealing temperature and time. The annealing temperature is controlled within the safe window that gluten proteins can tolerate, efficiently generating RS3-type resistant starch while protecting gluten activity. The resulting product simultaneously meets the following requirements: wet gluten content ≥ 26% and ≤ 30%, GI value ≤ 60, RS3-type resistant starch content ≥ 8%, RS3-type resistant starch melting temperature ≥ 120℃, flour water absorption rate ≥ 55%, stability time ≥ 5 minutes, stretching area ≥ 60 cm², and the ingredient list contains only wheat flour. Core Mechanism During annealing, amylose molecules rearrange themselves in an orderly manner along the surface of residual microcrystals to form RS3-type resistant starch, reducing the product's glycemic index (GI). The annealing temperature is controlled within the safe window that medium-gluten wheat flour gluten proteins can withstand, resulting in only slight stretching of the gluten proteins and complete preservation of their network-forming ability. Water absorption rate, stability time, and stretching area are three core flour quality indicators for evaluating the processing performance of medium-gluten wheat flour—water absorption rate reflects the dough's water absorption capacity, stability time reflects the dough's kneadability under mechanical mixing, and stretching area comprehensively reflects the dough's extensibility and toughness. This product meets the high-quality standards for medium-gluten wheat flour in all three indicators, proving that the annealing treatment did not cause substantial damage to the processing function of the gluten proteins. Beneficial effects (1) A complete quality index system for medium-gluten, low-GI wheat flour products was defined for the first time—the medium-gluten characteristics were defined by the wet gluten content range, the low-GI characteristics were guaranteed by the GI value and RS3 content, the crystal-locking effect of rapid cooling was guaranteed by the RS3 melting temperature, and the processing performance was guaranteed by the flour water absorption rate, stability time, and stretching area. (2) The ingredient list contains only wheat flour, with pure physical additives and zero additives, meeting the requirements for clean labeling. (3) It is suitable for making Chinese pastry products such as sugar-controlled steamed buns, dumplings, and dumpling wrappers. Detailed Implementation

[0004] Example 1 Medium-gluten wheat flour was annealed using a general modification method for medium-gluten wheat flour that balances gluten strength and blood sugar reduction, as described in patent application number 2026108480391. The annealing temperature was set at 55℃ and the annealing time at 14 minutes. The resulting product had a wet gluten content of 28.5%, a GI value of 57, an RS3 resistant starch content of 8.8%, an RS3 melting temperature of 122℃, a flour water absorption rate of 58%, a stability time of 5.8 minutes, and an stretching area of ​​68 cm². The ingredient list contained only wheat flour. When the product was made into steamed buns, the volume and softness of the buns were not significantly different from those made from ordinary medium-gluten wheat flour. Comparative Example 1 (Using high-gluten wheat flour annealing parameters resulted in impaired processing performance) The annealing temperature was changed to 53℃ (the annealing temperature for high-gluten wheat flour), and the annealing time was changed to 15 minutes, with all other conditions remaining unchanged. The resulting product showed a decrease in RS3 formation efficiency and a GI value of 62 (>60) due to the lower annealing temperature. This demonstrates that medium-gluten wheat flour requires independently optimized annealing parameters and cannot directly utilize the annealing parameters for high-gluten wheat flour. Comparative Example 2 (Addition of exogenous resistant starch lowers GI, but processing performance and label cleanliness are impaired) Adding 12% commercial resistant starch exogenously to untreated medium-gluten wheat flour reduced the GI value to 60, but the resulting steamed buns shrank by about 15% in volume and had a harder texture. Furthermore, the ingredient list required to include resistant starch, failing to meet clean labeling requirements. This demonstrates that exogenous addition methods cannot simultaneously achieve both low-to-medium GI and medium-gluten processing performance. Industrial applications This product is suitable for the industrial production of Chinese-style steamed buns, dumplings, and noodles with low sugar content. Seven indicators must be included in the product's factory inspection standards: wet gluten content range, GI value, RS3 content, RS3 melting temperature, flour water absorption rate, stability time, and tensile area. The ingredient list contains only wheat flour and meets clean label requirements.

Claims

1. A medium-gluten, low-glycemic index wheat flour, characterized in that, The wheat flour simultaneously meets the following characteristics: wet The gluten content is ≥26% and ≤30%, the GI value is ≤60, the RS3 resistant starch content is ≥8%, the RS3 resistant starch melting temperature is ≥120℃, the flour water absorption rate is ≥55%, the stability time is ≥5 minutes, the stretching area is ≥60cm², and the ingredient list contains only wheat flour.

2. The medium-gluten, low-glycemic index wheat flour according to claim 1, characterized in that, The wheat flour is prepared by the general modification method for medium-gluten wheat flour that balances gluten strength and blood sugar reduction, as described in any one of claims 1-5 of patent application No. 2026108480391; preferably, by optimizing the matching of annealing temperature and annealing time, a product with a GI value ≤60 is obtained.

3. The medium-gluten, low-glycemic index wheat flour according to claim 1, characterized in that, The wet gluten content is ≥28% and ≤30%, the GI value is ≤58, the RS3 resistant starch content is ≥9%, the stability time is ≥6 minutes, and the stretching area is ≥65cm².

4. The medium-gluten, low-glycemic index wheat flour according to claim 1, characterized in that, The GI value is ≤55, the RS3 resistant starch content is ≥10%, and the stability time is ≥7 minutes.

5. The application of the medium-gluten, low-glycemic index wheat flour according to any one of claims 1-4 in the preparation of sugar-controlled steamed buns, sugar-controlled dumplings, sugar-controlled noodle wrappers, and sugar-controlled noodles.