Single-strength juice is juice at its natural soluble-solids content as present in the fruit, without concentration, and serves as the reference state for minimum Brix values defined per fruit type in EU fruit juice rules and Codex standards.
In trade practice
Buyers specify single-strength juice by fruit type and minimum Brix, verified on receipt by refractometer against the values set in EU fruit juice legislation and the relevant Codex standard. Suppliers must ensure no water addition has occurred, as this would reclassify the product. QA teams check that certificates of conformity and batch test reports confirm soluble-solids content and the absence of added sugars or water.
In a specification
A purchase specification typically states the fruit source, minimum Brix at delivery and the requirement that the product is not reconstituted, referencing the applicable EU fruit juice directive or Codex standard.