Lacto-N-Neotetraose (LNnT) Regulatory & Structural Characterization

Lacto-N-Neotetraose

  When a regulatory dossier for an infant formula marketed in the European Union arrived at a notified body for review in 2023, the HMO ingredient list included both 2′-fucosyllactose and lacto-N-neotetraose. The reviewer’s first question to the manufacturer was not about efficacy data. It was about the structural characterization package for LNnT — specifically, whether the submitted HPLC method was capable of resolving LNnT from its type-1 chain isomer, Lacto-N-Tetraose. The two tetrasaccharides differ only in the linkage position connecting the internal galactose to the N-acetylglucosamine residue: type-2 chain in LNnT (β1-4) versus type-1 chain in LNT (β1-3). Most standard reversed-phase HPLC methods cannot differentiate them without optimized conditions, and the manufacturer was required to submit supplemental NMR data before the dossier could advance.

♦ Lacto-N-Neotetraose (CAS 13007-32-4) is a neutral tetrasaccharide present in human milk and structurally classified as the type-2 chain homolog within the core HMO family. Its biosynthetic role in human milk involves serving as the acceptor substrate for fucosyltransferases and sialyltransferases, which elongate the chain into the large HMO structures that dominate in late lactation. In the gut microbiome context, LNnT fermentation shows selectivity toward Bifidobacterium species equipped with specific oligosaccharide transport and degradation systems, though the fermentation profile differs from that of its type-1 isomer LNT in ways that have attracted attention from researchers trying to understand early colonization dynamics.
  For procurement purposes, the practical complexity is that commercial LNnT supply is produced by a small number of manufacturers using enzymatic or whole-cell biosynthetic platforms, and the purity standards that govern nutritional use are still evolving across regulatory jurisdictions. Buyers sourcing LNnT for infant nutrition product development need documentation at a level substantially beyond standard industrial chemical supply: structural identity confirmation by NMR or orthogonal chromatographic method, quantified isomer content, endotoxin or bioburden data if applicable to the production route, and regulatory status letters for the target market.
  Shandong Lookchemical Co., Ltd. supplies Lacto-N-Neotetraose (CAS 13007-32-4) for research applications with batch documentation that includes HPLC purity and molecular identity data. Quantities from milligram to gram scale are available for qualification work. The team at sdlookchem.com is available to discuss specification requirements and provide technical documentation for supplier qualification purposes. Directinquiry:sales01@sdlookchemical.com. Shandong Lookchemical Co., Ltd. handles export documentation for shipments to research institutions in North America, Europe, and Asia.
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