Gluten-Free Bread Composition Using Specific HPMC
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Solution Overview
Problem
Current gluten-free bread compositions face challenges in achieving high specific volume, maintaining crumb softness, and preventing staling, while also being cost-effective and easy to produce, as they often require additional processing steps and result in undesirable crumb texture and shape stability.
Innovation Solution
A composition comprising gluten-free flour and hydroxypropyl methylcellulose (HPMC) with specific methoxyl and hydroxypropyl content ranges, viscosity, and molecular weight distribution, which allows for the production of bread with increased specific volume, reduced crumb firmness, and improved shape stability without the need for additional sieving or labor-intensive steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If hydroxypropyl methyl cellulose is incorporated into gluten-free dough compositions, then specific volume increases and crumb softness is maintained, but additional processing steps and labor are required
Solution Approach 1:
The patent applies parameter changes by specifying precise methoxyl content (24.5-29.0%) and hydroxypropoxyl content (4.0-12.0%) ranges for the HPMC, along with viscosity (60-250 mPa·s) and molecular weight distribution (Mw/Mn ≤ 2.25). These controlled parameter variations optimize the balance between dough performance and ease of use, achieving high specific volume while minimizing processing complexity.
2Adaptability or versatility
If HPMC with broad molecular weight distribution is used, then dough flexibility is improved, but manufacturing precision and consistency decrease
Solution Approach 1:
The patent resolves this contradiction by controlling the molecular weight distribution parameter, specifically limiting Mw/Mn to 2.25 or less. This parameter control ensures that the HPMC provides adequate dough flexibility while maintaining consistent manufacturing results and product quality across production batches.
3Strength
If conventional HPMC is used in gluten-free bread, then initial crumb softness is achieved, but staling occurs rapidly during storage
Solution Approach 1:
The patent addresses staling by optimizing the HPMC methoxyl content (24.5-29.0%) and hydroxypropoxyl content (4.0-12.0%) parameters. This specific compositional range, combined with controlled viscosity and molecular weight distribution, creates a dough matrix that maintains crumb softness during storage and significantly delays staling compared to conventional HPMC formulations.
4Strength
If HPMC with high viscosity is used, then crumb softness is maintained, but specific volume decreases
Solution Approach 1:
The patent resolves this trade-off by specifying a controlled viscosity range (60-250 mPa·s) rather than using high viscosity alone. This optimized viscosity parameter, combined with specific methoxyl and hydroxypropoxyl content ranges, achieves the dual benefit of maintaining crumb softness while preserving adequate specific volume in the final bread product.
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 described composition results in gluten-free bread with higher specific volume, lower initial crumb firmness, and improved shape stability after cooling and storage, outperforming comparable compositions in terms of texture and visual appeal.
Implementation Method 1
The use of hydroxypropyl methyl cellulose in dough composition comprising gluten-free flour is well known... provides the processing qualities... When dough is fermented with yeast... the carbon dioxide gas generated by fermentation is retained by the gluten so that the gluten network is extended and the dough rises
Implementation Method 2
The incorporation of HPMC into gluten-free dough compositions indeed provides many advantages... the bread made from the dough composition is said to have a good mouthfeel and a satisfactory volume and retains softness over time
Data Source
AI summary
A composition useful for making gluten-free bread of high quality comprises a) a gluten-free flour, and b) a hydroxypropyl methylcellulose having a methoxyl content of from 24.5 to 29.0 percent and a hydroxypropoxyl content of from 4.0 to 12.0 percent, each being based on the total weight of the hydroxypropyl methylcellulose, and having a viscosity of from 60 to 250 mPa·s, determined in a 2% by weight solution in water at 20° C.