Indica Rice Processing for Lower GI Without Losing Natural Taste
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Solution Overview
Problem
Existing methods for reducing the glycemic index (GI) of rice often result in poor taste and palatability, failing to meet the needs of health-conscious consumers, particularly diabetic patients, as they alter the natural characteristics of rice.
Innovation Solution
A preparation method for low-GI rice using indica paddy rice, involving steps such as soaking, ultrasonic treatment, ultra-high pressure treatment, refrigeration, and oven-drying to maintain natural taste while reducing GI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing GI reduction methods (extrusion, puffing, recombination, adding exogenous substances) are used, then the glycemic index is reduced, but the taste and palatability deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling specific processing conditions: soaking at 20-25°C for 9-10 hours, ultrasonic treatment at 400-600W for 30 minutes, ultra-high pressure treatment at 450-600 MPa for 30-35 minutes, and refrigeration at 0-4°C for 45-50 hours. These controlled parameter changes modify starch structure to reduce GI while preserving the natural taste and characteristics of rice, avoiding the need for extrusion, puffing, or adding exogenous substances that would compromise palatability
Solution Approach 2:
The patent replaces aggressive mechanical processing methods (extrusion, puffing, crushing, granulation) with gentler physical treatments. Specifically, it uses ultrasonic vibration and ultra-high pressure treatment instead of mechanical extrusion and puffing, which preserves the integrity of rice grains and maintains their natural taste characteristics while still achieving GI reduction through starch structure modification
2Reliability
If miscellaneous grains are mixed and modified to reduce GI, then the glycemic index is reduced, but the natural characteristics of rice are altered
Solution Approach 1:
The patent applies preliminary action by soaking rice grains before processing to pre-soften them and prepare the starch structure for modification. This preliminary soaking step (9-10 hours at 20-25°C) enables subsequent ultrasonic and pressure treatments to effectively modify starch without requiring mixing with miscellaneous grains or adding exogenous substances, thereby preserving the natural composition and characteristics of pure rice
Solution Approach 2:
The patent uses water as an intermediary medium throughout the processing steps. Water serves as the medium for soaking, ultrasonic treatment, and ultra-high pressure treatment, enabling starch structure modification without introducing exogenous substances or requiring mixing with miscellaneous grains. This maintains the purity and natural characteristics of the rice while achieving GI reduction
3Reliability
If recombination or exogenous substance addition is used to reduce GI, then the glycemic index is reduced, but consumer acceptance decreases due to resistance to non-natural foods
Solution Approach 1:
The patent applies self-service by using the rice grains themselves as the sole material for GI reduction. The processing methods (soaking, ultrasonic treatment, ultra-high pressure treatment, refrigeration) modify the starch structure within the rice grains without requiring addition of exogenous substances or mixing with miscellaneous grains. This self-contained approach maintains the natural identity of rice, ensuring consumer acceptance while achieving effective GI reduction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces low-GI rice with preserved natural characteristics and excellent taste, suitable as a staple food for diabetic patients, by altering starch structure and digestibility.
Implementation Method 1
subjecting the first indica paddy rice to an ultrasonic treatment in water with a first preset volume to obtain second indica paddy rice
Implementation Method 2
subjecting the third indica paddy rice in the vacuum bag to an ultra-high pressure treatment at 450 MPa to 600 MPa for 30 min to 35 min
Implementation Method 3
refrigerating the fourth indica paddy rice in a refrigerator at 0° C. to 4° C. for 45 h to 50 h
Data Source
AI summary
A preparation method of a low-glycemic index (GI) rice includes: washing indica paddy rice to remove impurities, soaking the indica paddy rice in water to obtain first indica paddy rice, and after the soaking, subjecting the first indica paddy rice to an ultrasonic treatment in water with a first preset volume to obtain second indica paddy rice; after the ultrasonic treatment is completed, filtering out the second indica paddy rice, and cooking the second indica paddy rice in water with a second preset volume to obtain third indica paddy rice; placing the third indica paddy rice in a vacuum bag for sealing, and subjecting the third indica paddy rice in the vacuum bag to an ultra-high pressure treatment in an autoclave filled with water with a third preset volume to obtained fourth indica paddy rice; air-cooling the fourth indica paddy rice, and refrigerating the fourth indica paddy rice in a refrigerator to obtained fifth indica paddy rice; after the refrigerating is completed, oven-drying the fifth indica paddy rice in a blast air oven for 1 h, stopping blast, maintaining a temperature of the blast air oven unchanged, performing tempering treatment on the fifth indica paddy rice, and then oven-drying the fifth indica paddy rice until a moisture content of the fifth indica paddy rice is less than 16% to obtain sixth indica paddy rice; and shelling the sixth indica paddy rice to obtain the low-GI rice.