Stabilized Whole Grain Flour via Germ Extraction and Heat Treatment
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Solution Overview
Problem
Whole grain wheat flours with high bran and germ content are prone to rancidity due to enzymatic degradation, leading to undesirable flavors and textures, and existing stabilization methods often compromise baking performance or nutritional content.
Innovation Solution
A method involving grinding and heat-treating a coarse fraction rich in bran and germ to reduce lipase and lipoxygenase activity without substantial starch gelatinization, combined with a fine fraction of predominantly endosperm, to produce stabilized whole grain flours with improved shelf life and baking functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If whole grain wheat flours containing bran and germ are used to provide nutritional value, then the flour contains unstable natural oils and enzymes that lead to rancidity and spoilage, but the flour exhibits poor storage stability and develops undesirable odors and flavors
Solution Approach 1:
The patent removes the germ component from the whole grain flour, extracting the source of unstable oils and enzymes that cause rancidity. This allows the flour to retain bran for nutritional value while eliminating the primary cause of spoilage, thereby resolving the contradiction between nutritional content and storage stability
Solution Approach 2:
The patent modifies the compositional parameters of the flour by adjusting the ratio of bran to endosperm and removing the germ. This parameter change alters the chemical composition to reduce oxidative rancidity while maintaining acceptable nutritional value, thus improving storage stability without completely sacrificing nutritional benefits
2Ease of operation
If milling is increased to reduce grittiness caused by bran particles, then the surface area increases and natural encapsulation of lipids is reduced, but this increases interaction between lipids and enzymatic components thereby increasing rancidity
Solution Approach 1:
By removing the germ which contains the majority of lipids and enzymes, the patent eliminates the primary reactants needed for rancidity. This allows for more aggressive milling to reduce grittiness without significantly increasing rancidity, as the extracted germ was the source of the harmful lipid-enzyme interactions
Solution Approach 2:
The patent creates a composite flour material consisting of bran and endosperm without the germ component. This composite structure maintains the textural benefits of bran while the absence of germ lipids and enzymes prevents the harmful interactions that would otherwise occur during milling and storage
3Reliability
If heat and moisture treatment is used to inactivate enzymes responsible for flour deterioration, then enzyme activity is reduced, but this contributes to oxidative rancidity as measured by hexanal formation
Solution Approach 1:
The patent removes the germ which contains the unstable oils that serve as substrates for oxidative rancidity. By eliminating these oils before heat treatment, the flour is less susceptible to hexanal formation even when subjected to heat and moisture treatment for enzyme inactivation, thus resolving the contradiction between enzyme control and oxidative stability
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 results in whole grain flours with low rancidity, extended shelf life, and superior baking performance, retaining high levels of nutrients and antioxidants while maintaining excellent dough machinability and oven spread.
Implementation Method 1
stabilizing the coarse fraction by heating the coarse fraction to reduce the lipase activity of the coarse fraction
Implementation Method 2
heat treatment is commonly used to inactivate enzymes responsible for flour deterioration
Data Source
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AI summary
A stabilized bran component and a stabilized whole grain flour containing the component are produced by subjecting a bran-enriched coarse fraction which contains bran, germ and starch to grinding or milling to reduce grittiness of the coarse fraction without substantially damaging the starch due to abrasion. The coarse fraction may be stabilized by heating to substantially reduce the lipase and lipoxygenase activity of the coarse fraction without substantial gelatinization of the starch. High levels of natural antioxidants and vitamins are retained while avoiding substantial acrylamide formation during the stabilization. The stabilized coarse fraction or stabilized bran component may be combined with a fine fraction which contains predominantly endosperm to obtain a stabilized whole grain flour. The stabilized whole grain flours and the stabilized bran component exhibit extended shelf life and may be used for making baked goods, such as cookies, with desirable oven spread, and a non-gritty mouthfeel.