Our rich experience in the purification and structural analysis of lipopolysaccharide (LPS) and the advanced technology platform guarantee the quality of our services. We have confidence to be your essential research assistant in the field of glycobiology.

Background

LPS is the main outer membrane component of gram-negative bacteria, accounting for about 75% of the total surface weight. Its basic structure consists of lipid A, core oligosaccharides, and repeating polysaccharides called O-antigens. Lipid A is highly conserved and has endotoxin activity, while the O-antigen carbohydrate chain is a polymer of repetitive oligosaccharides, which vary between different species and are responsible for the serological specificity of bacteria. The lipid A part in LPS enters the lipid layer as a component of the outer lipid bilayer, and the sugar chain is exposed outside the cell. LPS has thermal and chemical stability and cannot be inactivated by a general autoclave or dry heat sterilization method.

LPS can cause pathophysiological effects such as fever, leukopenia, and leukocytosis. Because of its important pathogenic effect in diseases caused by gram-negative bacteria, many researchers have conducted studies on its isolation and purification. Contamination of proteins and nucleic acids is the main disadvantage of the LPS purification scheme. These contaminations will hinder the application of the final product in sensitive assays such as molecular and immunological experiments. Although ultracentrifugation can be used to eliminate contaminating proteins, this usually results in a decrease in yield.

Key Technologies

CD BioGlyco has optimized the procedure based on hot phenol extraction to better purify LPS and make it more active. The purification process we provide includes but is not limited to the following steps.

• Bacterial cell culture
• LPS extraction and purification
• Silver, coomassie blue and ethidium bromide staining
• High performance liquid chromatography (HPLC) separation
• Limulus amebocyte lysate (LAL) assay
• Rabbit pyrogen test

Unlocking the Power of the Outer Membrane: Advanced LPS Purification

• Optimized Extraction Methods

We utilize a variety of established protocols to extract LPS from gram-negative bacteria, tailored to the specific characteristics of your microbial strain and project requirements.

• Hot phenol-water extraction: This is a classic and highly effective method for isolating large amounts of LPS by leveraging its unique solubility properties. While it is a biohazard that requires careful handling, its high yield and ability to denature proteins make it a powerful tool.
• Alternative chemical extractions: We also employ safer, non-phenol-based methods, such as butanol, ether, or propanol-sodium hydroxide extractions, which are known for their speed, affordability, and improved safety profiles.
• Multi-Stage Purification for Contaminant Removal

To address the primary challenge of contamination, our workflow incorporates a series of critical purification steps.

• Enzymatic digestion: A crucial step in our protocol is the use of enzyme treatments to eliminate nucleic acid and protein contaminants that are often co-isolated with LPS.
• Chromatographic techniques: We employ a range of chromatographic methods to further purify the LPS.
  • Size exclusion chromatography (SEC): This technique separates molecules based on size. Because LPS tends to form large aggregates or micelles in solution, SEC can effectively separate it from smaller contaminants like nucleic acids.
  • Ion exchange chromatography: LPS is a negatively charged molecule. We leverage this property by using positively charged ion exchange resins to attract and retain LPS, separating it from other components in the sample.
  • Affinity chromatography: We also offer affinity chromatography using a ligand, which specifically binds to LPS, allowing for its highly selective capture.

Advanced Purity Assessment

The structural heterogeneity of LPS makes its characterization particularly complex. We utilize cutting-edge analytical platforms to provide definitive data on LPS purity and structure.

• HPLC: HPLC is the gold standard for assessing the purity of isolated LPS. Our protocols provide a high degree of purity comparable to commercial standards.
• High-resolution mass spectrometry (MS/MS): Mass spectrometry is an indispensable tool for elucidating the complex structures of LPS, its lipid A, and its core oligosaccharide. We employ advanced techniques like field asymmetric ion mobility spectrometry (FAIMS) to separate isobars and isomers, enabling an in-depth, unbiased characterization of your LPS mixture.

Workflow

Case Study

Background

LPS is the major structural component of the outer membrane of Gram-negative bacteria and serves as a powerful stimulator of the mammalian immune system. In immunological research, vaccine development, and pharmaceutical quality control, obtaining high-purity LPS is paramount. However, standard extraction processes frequently suffer from heavy contamination with bacterial proteins and nucleic acids. Furthermore, the structural heterogeneity of the core oligosaccharide, O-antigen, and Lipid A regions requires sophisticated analytical methods to resolve monosaccharide and fatty acid composition for definitive batch-to-batch consistency.

Our Solution

CD BioGlyco deployed an advanced, multi-stage isolation, enzymatic purification, and analytical characterization to deliver ultra-pure, ultra-low-residue LPS from bacterial cell pellets.

• Optimized Hot Phenol-Water Extraction: Bacterial cells underwent controlled sonication and a modified hot phenol-water extraction to efficiently separate crude LPS into the aqueous phase while denaturing bulk cellular proteins, followed by extensive, multi-day dialysis against deionized water.
• Dual-Enzymatic Contaminant Elimination & Ultracentrifugation: To eliminate trace macromolecules, the crude matrix was sequentially treated with high-efficiency Benzonase nuclease and proteinase K. The mixture then underwent high-velocity ultracentrifugation, effectively pelleting pure LPS aggregates away from residual digested fragments.
• Strict Quality Control & Quantitative Assays: The purified LPS was rigorously evaluated for protein and nucleic acid contamination using a bicinchoninic acid (BCA) assay and UV-Vis spectrophotometry (NanoDrop), respectively, ensuring absolute compliance with your requirement.

Results

To provide a complete structural fingerprint, the purified LPS was subjected to chemical derivatization and analyzed via high-resolution Gas Chromatography-Mass Spectrometry (GC-MS). The final deliverables successfully met the client's strict purity and composition benchmarks:

• Ultra-Low Contamination Profile: Quantitative analysis demonstrated exceptionally low, trace-level concentrations of background proteins and nucleic acids, confirming the superior performance of the enzymatic and ultracentrifugation cleanup steps.
• Definitive Monosaccharide Fingerprinting: Utilizing an internal standard-spiked trimethylsilyl (TMS) derivatization workflow, individual sugar monomers were accurately quantified against a panel of fourteen monosaccharide standards. The assay successfully mapped the precise mole percentages of core and O-antigen sugars—specifically resolving Rhamnose (Rha), Galactose (Gal), Glucose (Glc), Heptose (Hep), and N-acetylglucosamine (GlcNAc).

Fig.1 Chromatogram of standard monosaccharide mixture-1. (CD BioGlyco)

Fig.2 Chromatogram of standard monosaccharide mixture-2. (CD BioGlyco)

Table 1 Monosaccharide content. (CD BioGlyco)

• Fatty Acid Profiling: Lipid A fatty acid chains were definitively elucidated and presented as relative area percentages, establishing a comprehensive structural map of the endotoxin.

This robust, streamlined purification and analytical workflow provided the client with premium-grade, fully characterized LPS. By eliminating interfering cellular artifacts and delivering an exhaustive structural data package, our platform successfully accelerated the client's downstream adjuvant development and macrophage activation studies.

Publication Data

Applications

• Research on antibodies and inhibitors of lipopolysaccharide-related diseases (such as sepsis)
• Structure and function research of lipopolysaccharide
• Study on the protective mechanism of lipopolysaccharide on gram-negative bacteria
• Composition research of lipopolysaccharide

Advantages

• LPS purification is a complex, multi-stage process that requires specialized knowledge and meticulous execution. Our team has extensive, hands-on experience and a proven track record, ensuring that your project is handled by seasoned experts.
• Our integrated workflow, which includes enzymatic digestion and multi-stage chromatographic purification, effectively eliminates contaminating proteins and nucleic acids. This guarantees a final product with exceptional purity, which is critical for preventing false immunological readouts and ensuring reliable results in your sensitive assays.
• We provide access to state-of-the-art analytical platforms, including high-resolution mass spectrometry and advanced chromatography, which can be costly and challenging to acquire and maintain in-house. This allows you to leverage cutting-edge technology without a significant capital investment.

Frequently Asked Questions

Associated Services

Following the meticulous purification of LPS, which is a pivotal step to ensure sample integrity for subsequent structural and functional studies, a comprehensive structural analysis of its carbohydrate components often becomes essential. For detailed characterization of specific oligosaccharide types, our Oligosaccharide Analysis Service offers specialized profiling, including Raffinose Analysis Service, Stachyose Analysis Service, and Mannan Oligosaccharides Analysis Service, to meet diverse research needs in carbohydrate chemistry.

We constantly update our technology platform to provide customers with comprehensive and high-quality lipopolysaccharide purification and profiling services. We have provided successful services to scientific researchers from all over the world. CD BioGlyco will continue to raise the standard to meet customers' glycobiology research needs.

Customers can contact our employees directly and we will respond promptly. If you are interested in our services, please contact us for more detailed information.

Reference

1. Cochet, F.; Peri, F. The role of carbohydrates in the lipopolysaccharide (LPS)/toll-like receptor 4 (TLR4) signalling. International journal of molecular sciences. 2017, 18(11): 2318. (Open Access)

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