Sialylactose—the precise key to nutrition and health intervention in early life CAS: 35890-38-1

Sialylactose (3’-SL) is one of the most critical and abundant acidic members of the human milk oligosaccharide (HMOs) family and is known as the “golden ingredient in breast milk.” It is not only the core substance of the unique nutrition and protection system provided by breast milk for infants, but also an indispensable functional raw material and key probe in modern nutritional science, infant health products and high-end biopharmaceutical research and development. Its unique biological functions are leading a new wave of early life nutritional intervention, microecological preparations and carbohydrate drug development.

Chemical Information

Chemical name: O-α-N-acetylneuramidyl-(2→3)-O-β-D-galactosyl-(1→4)-D-glucose

Common name: 3’-Sialyllactose, 3’-Sialyllactose

Chemical formula: C₂₃H₃₉NO₁₉

Molecular weight: 633.55 g/mol

CAS number: 35890-38-1

Structural features

3‘-Silyllactose is composed of a sialic acid (N-acetylneuraminic acid, Neu5Ac), a galactose (Gal) and a glucose (Glc) linked through specific glycosidic bonds. The essence of its structure lies in:

Key α-2,3 connection: Sialic acid is connected to the galactose residue through an α-2,3 glycosidic bond. This connection determines its specificity of interaction with specific pathogenic microorganisms (such as influenza virus, Helicobacter pylori) and cell surface receptors, and is the structural basis for its role as a "molecular bait" in immune regulation.

Terminal negative charge and hydrophilicity: Sialic acid is negatively charged at physiological pH, giving 3‘-SL strong hydrophilicity and unique charge distribution, allowing it to effectively affect the charge balance of the intestinal environment and interact with positively charged pathogens or toxins.

Intestinal-selective "prebiotic" skeleton: Its lactose core (Gal-β(1→4)-Glc) is the preferred substrate for intestinal beneficial bacteria (such as Bifidobacterium), and the modification of sialic acid further increases the host selectivity and functionality of its metabolism, making it superior to ordinary prebiotics.

Main applications and advantages

1. Core functional ingredients of the next generation of infant formula

Simulate breast milk and narrow the gap: Traditional infant formula foods have long been blank in terms of HMOs ingredients. The addition of high-purity 3'-SL is the most cutting-edge and most substantial breakthrough in achieving "breastmilkification" in high-end formula milk, aiming to provide protection and development support closer to breastmilk for infants who are unable to receive breastmilk.

Double health benefits:

Immune defense and regulation: 3‘-SL can serve as a soluble receptor analog that competitively binds to pathogens (such as specific bacteria and viruses) in the intestine, preventing them from attaching to intestinal epithelial cells, thereby directly resisting infection. At the same time, it can also gently regulate the development of the baby's immune system, promote healthy immune tolerance, and reduce the risk of allergies and inflammatory diseases.

Promotes brain development: Sialic acid is an important component of brain gangliosides and sialoglycoproteins, which are critical for synapse formation and cognitive development. Dietary supplementation of 3'-SL can directly increase the availability of sialic acid in infants and support early neurodevelopment and cognitive abilities.

Shape healthy intestinal flora: Its precise "prebiotic" effect can selectively promote the proliferation of beneficial bacteria (especially Bifidobacterium), inhibit the growth of harmful bacteria, and help establish a balanced and healthy intestinal microecology, which is crucial for long-term health.

2. Star raw materials for innovative functional foods and special medical foods

Health throughout the life cycle: The health benefits of 3‘-SL are not limited to babies. Its immunomodulatory and intestinal health functions make it have great potential in functional foods and dietary supplements for children, adults and the elderly to enhance immunity, regulate intestinal function, and assist in preventing infections.

Disease nutritional support: Under specific disease states (such as diseases related to intestinal flora imbalance, infection recovery period, low immunity, etc.), 3'-SL can be used as a key functional module of formula foods for special medical purposes to provide targeted nutrition and microecological intervention.

3. Valuable tools and candidate molecules for biomedical research and development

Anti-infective drug development: Based on its mechanism as a pathogen receptor mimic, 3‘-SL and its structural derivatives are lead compounds for the development of new antiviral (such as anti-influenza) or antibacterial (such as anti-Helicobacter pylori) inhibitors. They have the advantages of novel mechanism of action and low potential for side effects.

Drug delivery and targeting: Sialic acid modification is an important strategy to improve the pharmacokinetics of drugs (especially nucleic acid drugs and nanoformulations) and achieve cell-specific targeted delivery. 3‘-SL or its derivatives are ideal raw materials for building such “smart” delivery systems.

Basic research and diagnosis:

Glycobiology research tools: As a natural sugar chain with a clear structure, 3‘-SL is a standard and key reagent for studying biological processes such as sialic acid-mediated cell recognition, signal transduction, and pathogen invasion.

Biomarkers and detection: Changes in the expression of specific sugar chain structures (containing α-2,3-linked sialic acid) are related to certain diseases (such as cancer, inflammation). 3‘-SL can be used to develop relevant detection kits or as diagnostic standards.

Conclusion

Sialylactose (3‘-Sialyllactose) is much more than just a sugar. It is a natural instruction programmed early in life, an intelligent bridge connecting nutrition, microbiota and the immune system. From empowering infant formulas that are closer to breast milk, to developing intestinal health and immune support products for the entire population, to serving as a source of inspiration and cornerstone material for cutting-edge biopharmaceutical research and development, its value is being increasingly discovered.

The above information is provided by the editor of KASONS and is for scientific research only.