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Rye bread

Type of bread made with various proportions of flour from rye grain

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Through Flour, Wheat and Dietary fiber

Rye bread was considered a staple through the Middle Ages. Many different types of rye grain have come from north-central, western, and eastern European countries such as Iceland, Germany, Poland, Austria, Denmark, Sweden, Norway, Finland, Estonia, Latvia, Lithuania, Belarus, Ukraine, Russia, the Netherlands, Belgium, France, and the Czech Republic, and it is also a specialty in the canton of Valais in Switzerland.

Archaeobotanical discoveries in Britain and Ireland show it was in use in both areas since at least the early Iron Age. However, evidence of sustained intentional cultivation, especially before then, is uncertain. Rye cultivation in Britain and Ireland became relatively uncommon in the 1700s due to a shift in farming techniques and technology during the Second Agricultural Revolution.

Biochemistry

While rye and wheat are genetically similar enough to interbreed (resulting in hybrids known as triticale), their biochemistries differ enough that they affect the breadmaking process. The key issue is differing amylases, the enzyme which breaks starch down into sugar. While wheat amylases are generally not heat-stable and thus do not affect stronger wheat gluten that gives wheat bread its structure, rye amylase remains active at substantially higher temperatures. Since rye gluten (secalin) is not particularly strong, rye dough structure is based on complex polysaccharides, including rye starch and pentosans. As a result, amylases in rye flour can break down dough structure, inhibiting it from rising.

There are two common solutions: The traditional manner, developed where obtaining wheat was impractical because of marginal growing conditions or supply difficulties, uses dough acidification to impede the function of rye amylases. Lowering dough pH, however, compromises the use of relatively acid-intolerant Saccharomyces cerevisiae-based "baker's yeast". Instead, the addition of naturally acidic Lactobacillus "sourdough" cultures lowers bread pH, facilitating the growth of an acid-tolerant yeast strain, and helping gelatinize starches in the dough matrix. The byproduct of this approach is lighter bread.

In areas where high-gluten hard wheat is readily available, the need for a complex polyculture of bacteria and yeast can often be reduced or removed by adding a large proportion of hard wheat flour to the rye flour. Its added gluten compensates for amylase activity on the starch in the dough, allowing the bread to retain its structure as it bakes. The "deli rye" tradition in the United States is based upon this mixing of grains. Use of high-gluten wheat flour also makes multigrain bread possible, like the "rye and Indian" bread of the American colonies, which combined rye and wheat with cornmeal in one loaf.

Rye bread contains phenolic acids and ferulic acid dehydrodimers.

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