Lacto-N-Tetraose (LNT) Structure and Isomer Differentiation

Lacto-N-Tetraose

   A formulation scientist at an infant nutrition company recalled the moment her team confirmed their first successful Lacto-N-Tetraose incorporation into a clinical trial batch. The production had been straightforward once the purity question was resolved, but the specification battle had taken eight months. Their target was an HMO blend that matched the oligosaccharide profile of average human milk at day three of lactation, and LNT needed to be present at a defined molar ratio relative to 2′-FL. The supplier they had been working with could meet the purity number but could not consistently deliver the structural isomer profile documentation — specifically, the confirmation that the Gal-β(1-3)-GlcNAc-β(1-3)-Gal-β(1-4)-Glc tetrasaccharide sequence was within tolerance and not contaminated with its structural near-neighbor LNnT. The two compounds are not separated by a standard HPLC assay unless the gradient and column are specifically optimized for the purpose.

  ♦Lacto-N-Tetraose (CAS 14116-68-8) is a neutral human milk oligosaccharide with the tetrasaccharide core structure that constitutes one of the backbone motifs of the HMO family. Biosynthetically, it is the product of type 1 chain elongation and serves as a precursor for a broad range of fucosylated and sialylated oligosaccharides detected in human milk at varying concentrations depending on the mother’s secretor and Lewis blood group status. In the context of infant nutrition research, LNT has been associated with bifidogenic activity — specifically selective fermentation by Bifidobacterium infantis strains that colonize the neonatal gut — as well as with receptor-mediated anti-adhesion mechanisms that may reduce pathogen colonization of mucosal surfaces.
  Commercial production of LNT for nutritional application is predominantly enzymatic or microbial biosynthetic, which distinguishes it from purely chemical synthesis routes used for smaller research quantities. The resulting purity, the residual enzyme or fermentation byproduct profile, and the water activity of the final dried product differ substantially between manufacturers and between production campaigns. Buyers evaluating LNT suppliers should request not only HPLC purity data but the chromatographic method used, the column type, and the reference standard source — particularly with respect to structural isomer differentiation from LNnT.
  Shandong Lookchemical Co., Ltd. supplies Lacto-N-Tetraose (CAS 14116-68-8) for research and development applications, with batch documentation including HPLC purity data, molecular weight confirmation, and GHS-compliant SDS. Sample quantities for incoming qualification are available on request. Contact the team directly at sales01@sdlookchemical.com with specification questions or visit sdlookchem.com for current stock and pricing information. Minimum order is 1 gram for research grade; bulk quantities are available on inquiry.
Lacto-N-Tetraose

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