Starch.
Genetic engineering can be associated with starch derived sugars that are used in foods and beverages in two ways. The plant starch source can be genetically modified, and the enzymatic "tools" used for breaking down the starch can be made by genetically modified microorganisms. When maize is used as a source of starch, a certain portion of the raw material may be genetically modified, as GM maize is common in the US and in other countries. When GM maize in Europe becomes more widespread, so will the proportion of GM content in starch processing. For potatoes, the second most important source of starch, GM cultivars with optimized starch content are getting closer to commercial cultivation. Most of the enzymes used in starch saccharification are produced with the help of genetically modified microorganisms. Some of these enzymes are economically impossible to produce without biotechnological methods.

Certain procedures use "immobilized" enzymes, which are bound to a reaction surface. Rather than mixing freely, they remain fixed to a surface and are not present in the final product. It is impossible to tell by examining starch derived sugar products if the source material was genetically modified or if the enzymes used were produced with the help of genetically modified microorganisms. Nonetheless, such products require labeling if they contain sugar products derived from the starch of genetically modified plants. Enzymes do not need to be declared or listed, regardless of the way they were produced. Converting starch to sugar is one of the most economically important areas of biotechnology. It is a central process in the production of countless foods. Enzymes are responsible for the breakdown of starch, the vast majority of which are produced by genetically modified microorganisms. Starches are chemically bound clusters of sugar molecules found in plants. Under the right conditions, starch molecules can be broken down into sugar. This process makes it possible to obtain sugar from the starch of many different plants, rather than just sugar beets or sugar cane. This is now being done by industrial-scale starch saccharification. The most important sources of starch are maize, potatoes, and wheat. Strong acids were once used to break apart starch molecules and release sugar. Now, enzymes do the job offering many advantages: With enzymes, the process targets the proper chemical bonds much more precisely. Different enzymes can be used to produce syrups with different levels of sweetness and different technical characteristics. The end products are not only used as custom tailored ingredients in countless foods and drinks, they can also be further processed into glucose, artificial sweeteners, or fat substitutes. For a long time, breaking down starch (saccharification) didn't make economic sense. Things changed, however, as soon as the enzymes responsible for this process became available at low cost, high quality, and at unlimited quantities. Now, almost all of the enzymes used to break down starch are produced with the help of genetically modified microorganisms.

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