"source of starch" is correct and usable in written English.
You could use it when describing a food or ingredient that contains starch as a major source of energy. For example, "Potatoes are a common source of starch."
Biomass – trees, plants and other waste vegetable matter – is an abundant and rapidly renewable source of starch and sugars, that is nowadays used to produce biofuels.
Potatoes, a leading crop, are used as a source of starch and alcohol as well as for food.
Broad beans Beans are quite starchy and release the sugar in the starch quite slowly into the bloodstream, which means they keep your appetite sated for longer and are a better source of starch than grains.
HQCF can also serve as a source of starch for the textile industry.
Swinkels (1985) showed that the extent of polymerisation of starch molecule is influenced by the source of starch.
These media contain a carbon source which can be obtained from potato, an abundant source of starch.
Other sources of starch that gelatinize at 55 to 65 °C (131 to 149 °F) can be mashed along with malt.
The sago palm and, to a lesser extent, the sugar palm and the gebang palm are sources of starch obtained from the pith.
The use of unmalted cereals has also become common, because they are less expensive sources of starch and can be used to dilute malt colour and flavour, thereby yielding fresher, lighter beers.
Collectively, our results indicate that dietary sources of starch affected both growth performance and N utilization in weaned pigs.
Species with pores, channels and cavities are therefore potential sources of starch which will be amenable to enzyme manipulation for a range of industrial uses.
