Key points
- Traditional sour cassava starch relies on spontaneous fermentation and solar drying, which deliver high baking expansion but are hard to standardise
- The study tested alpha-amylase at 6 units per gram of starch together with calcium lactate at 0, 3, 6 and 9 mg per gram of starch
- The best formulation was 6 U/g alpha-amylase with 6 mg/g calcium lactate, which gave the greatest bread specific volume among the treatments tested
- That treatment showed apparent amylose of 8.61%, gelatinisation torque of 2.01 Nm and a retrogradation tendency of 1.48 Nm
- The estimated glycaemic index of the resulting bread was 50.9
The problem with traditional sour starch
Sour cassava starch is the base ingredient for several baked goods in Latin America. Its appeal is that it produces high expansion without yeast or gluten.
The traditional process leaves the starch to ferment spontaneously and then dries it in the sun. Both steps change the starch’s molecular structure in ways that create the baking behaviour.
The difficulty is that this process depends on local weather and local microorganisms, so quality varies between production batches and is hard to hold to a standard.
What the study tested
Researchers from Ecuador and Argentina set out to reproduce the same properties through a controllable route, using an enzyme in place of fermentation.
Their conditions were alpha-amylase at 6 units per gram of starch combined with four levels of calcium lactate, after which they measured structural, rheological, functional and nutritional properties.
The analysis indicated the enzyme acted mainly on the less ordered regions of the starch granule, redistributing short-range molecular organisation.
The numbers for the best treatment
| Measure | 6 U/g alpha-amylase + 6 mg/g calcium lactate |
|---|---|
| Apparent amylose | 8.61 ± 0.03 % |
| Gelatinisation torque | 2.01 ± 0.07 Nm |
| Retrogradation tendency | 1.48 ± 0.1 Nm |
| Bread specific volume | highest among treatments tested |
| Estimated glycaemic index | 50.9 |
Source: Abad-Quevedo et al., Foods vol. 15 no. 17 (2026)
Lower apparent amylose and a reduced retrogradation tendency are properties tied to bread texture after baking, while the higher gelatinisation torque reflects how the starch behaves as it is heated.
The authors conclude that this enzymatic modification offers a repeatable alternative for producing high-quality gluten-free breads.
Why this matters to starch users
Native cassava starch is the starting material for this work, so the results are information about how a starch’s properties can be tuned for a specific application.
For developers of gluten-free products, the point of interest is consistency, since an enzymatic process specifies dose and conditions far more precisely than spontaneous fermentation does.
The estimated glycaemic index of 50.9 is the figure reported for the bread made in this trial, not a value to be applied to commercial products generally.
The work was carried out at laboratory scale. Industrial use would require further testing under real production conditions.
The starting starch still matters
The properties of any modified starch depend on the native starch it is made from — the consistency of its viscosity, its moisture and its purity.
Specifications and controlled ranges for native tapioca starch are on our products page.
The research described here was verified through the PubMed database.
ที่มา / Sources:
- Abad-Quevedo V., Correa M.J., Cornejo F., Maldonado-Alvarado P. “Alpha-Amylase-Modified Cassava Starch in the Presence of Calcium Lactate as a Sour Starch Substitute for Gluten-Free Breadmaking.” Foods vol. 15 no. 17, 27 August 2026 (verified via PubMed, PMID 42737256) - https://doi.org/10.3390/foods15173013
- PubMed, biomedical bibliographic database - https://pubmed.ncbi.nlm.nih.gov/42737256/