Analyte Definition Description of the analyte: Galactooligosaccharides (GOS).—Also known as oligogalactosyllactose, oligogalactose, or transgalactooligosaccharides (TOS) produced by transgalactosylation of lactose. General formulae are shown in Figure 1 .
Rationale: Recent work suggests that some GOS products may contain oligosaccharides with DP>10. No real scientific basis to restrict upper chain length.
IUPAC Nomenclature of Carbohydrates Recommendations 1996 Pure & Appl. Chem., Vol. 68, No. 10, pp. 1919-2008, 1996
Oligosaccharides are compounds in which monosaccharide units are joined by glycosidic linkages. According to the number of units, they are called disaccharides, trisaccharides, tetrasaccharides, pentasaccharides etc. The borderline with polysaccharides cannot be drawn strictly ; however the term ‘oligosaccharide’ is commonly used to refer to a defined structure as opposed to a polymer of unspecified length or a homologous mixture.
Specific Performance Claims
• Analytical range: Previous: 0.2 – 5.0 g/100 g Proposed: 0.2 – 3.0 g/100 g
• LOD: Not defined (no change)
• LOQ: ≤ 0.2 g/100 g (no change)
Reduced the upper concentration of GOS to 3 g/100g because we don’t think there are any products with higher levels, and it is probably unlikely that any will be developed. Note: for infant formula the maximum amount of non-digestible oligosaccharides permitted in regulations is 0.8 g/100g.