Maple syrup is made by collecting and concentrating maple sap by boiling. Maple syrup making was common to all the tribes in Colonial America and Canada and quickly adapted by European settlers. The dominant sugar of maple syrup is sucrose with small amounts of glucose and fructose as well as trace concentrations of polysaccharides and oligosaccharides. The pH of maple syrup varies from 4.73 to 8.26; the central value reported is pH 6.7. Syrup pH varies primarily due to soil mineral content and the bacterial and yeast populations in the lines collecting the syrup.