Monosaccharide compositions of sulfated chitosans obtained by analysis of nitrous acid degraded and pyrazolone-labeled products

An optimize adaptable method for determining the monosaccharide composition of pectic polysaccharides

Pectic polysaccharides are considered the highly complex natural plant polysaccharides which plays a vital role in plant tissue structure and human health. Detailed characterization of the monosaccharide composition can provide insights into the pectic polysaccharide structure. Nevertheless, when analyzing the monosaccharides of pectic polysaccharide, it is crucial to address the issue of incomplete hydrolysis that can occur due to the formation of acid-induced precipitates. Based on above, the main purpose of this article is to provide an optimized method for monosaccharide analysis of pectic polysaccharides through acid hydrolysis optimization using high-performance anion exchange chromatography (HPAEC) The results indicate that reducing the sample concentration to 0.5 mg/mL effectively reduces the acid gelling phenomenon and promotes the complete hydrolysis of pectin polysaccharides. The optimized parameters for acid hydrolysis involve 110 °C for 6 h in 2 M TFA. Furthermore, the consistency of this method is assessed, along with its ability to analyze pectin polysaccharides from various fruits. This hydrolysis approach holds promise for enabling accurate quantification of monosaccharide composition in pectic polysaccharides.

Anticoagulant Protective Effects of Sulfated Chitosan Derived From the Internal Bone of Spineless Cuttlefish (Sepiella inermis)

Background This study investigated the anticoagulant properties of sulfated chitosan derived from the internal bone of the spineless cuttlefish Sepiella inermis. Chitosan, a biopolymer, is used in various biomedical applications including anticoagulation. Sulfation of chitosan enhances its biological activity, making it a potential therapeutic agent. This study explored the efficacy of sulfated chitosan in preventing blood clot formation to provide a novel anticoagulant alternative. Objectives This study aimed to synthesize and characterize the anticoagulant properties of sulfated chitosan extracted from the internal bone of the spineless cuttlefish S. inermis using Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), and X-Ray Diffraction (XRD) and evaluate the anticoagulant properties of sulfated chitosan extracted from the internal bone of spineless cuttlefish S. inermis. Materials and methods Chitin and chitosan were extracted from the cuttlebone of a specimen of S. inermis, and sulfated chitosan was synthesized by sulfation of chitosan. Sulfated chitosan was subsequently used to evaluate its anticoagulant properties using tests such as activated partial thromboplastin time (APTT) and prothrombin time (PT). Characteristic investigations were conducted, including FTIR, FESEM, and XRD analyses. Results The results of this study suggested the possibility of using S. inermis internal bone as an unconventional source of natural anticoagulant that can be combined with biomedical applications. Anticoagulant activity measured using APTT and PT showed that sulfated chitosan was a strong anticoagulant. Conclusion We examined the anticoagulant activity of S. inermis extract using thrombin and activated partial thromboplastin times. Our results demonstrated the heparin-like anticoagulant action of the extracted sulfated chitosan, suggesting that it may be a great alternative anticoagulant treatment.

Quantitative Disaccharide Profiling of Glycosaminoglycans from Two Different Preparations by PMP and Deuterated PMP Labeling

Glycosaminoglycan (GAG) fine structures from the same animal cells and tissues are controlled not only by the biosynthetic and metabolic enzymes but also by other environmental factors, such as chemicals, growth factors, nutritional factors, and isolation procedures. To facilitate direct quantitative comparison of disaccharide compositions from different GAG preparations, several stable isotope labeling strategies have been developed. In this report, 1-phenyl-3-methyl-5-pyrazolone (PMP) and deuterated d5-PMP are used for differential disaccharide labeling and profiling of chondroitin sulfate GAG by high performance liquid chromatography (HPLC) coupled with mass spectrometry (MS).

Sulfation of chitosan from Sepia kobiensis as potential anticoagulant and antibacterial molecule

The present work aimed to synthesis of chitin, chitosan and sulfation of chitosan from cuttlebone of cuttlefish Sepia kobiensis. Principally chitin was extracted through sequential processes of demineralisation and deproteinzation. Then chitosan was synthesized by a deacetylation and finally sulfated at semi-heterogeneous condition using chlorosulfonic acid in N,N-dimethylformamide. The synthesized macromolecules were characterized for its structural, physical and thermal (CHN, DDA, FT-IR, NMR, XRD, Viscometric analysis, SEM and DSC) properties. Apart from anticoagulant potential of the sulfated chitosan was tested using human plasma by means of activated partial thromboplastin time (APTT) and prothrombin time (PT). Further sulfated chitosan was tested for antibacterial potential by well diffusion method against eleven human pathogenic clinical isolates of both Gram positive and Gram-negative strains and minimum inhibitory concentrations (MIC) was calculated accordingly. The results of this study revealed the effectiveness of the sulfated chitosan at semi-heterogeneous conditions as a potent antibacterial and anticoagulant molecule.

Chitin from Antarctic krill shell: Eco-preparation, detection, and characterization

Antarctic krill is a nutrient-rich crustacean that is one of the main species in the Antarctic ecosystem. Antarctic krill shell (AKS) can be used as raw materials to prepare chitin. In this study, lactic acid and dispase were used to prepare Antarctic krill chitin (AKC-1). Amino-monosaccharide contents of chitin samples were detected by pre-column PMP-HPLC method. Analytical instruments were conducted to determine characteristics of chitin samples. Results showed that the amino-monosaccharide content of AKS was 4.62 g/100 g (measured in D-glucosamine). The yield of AKC-1 was 5.49 g/100 g, and the amino-monosaccharide content was 80.90 g/100 g. AKC-1 showed smooth flakes, a porous surface, and α-chitin structural characteristics. The maximum degradation temperature (DTG_max) was 318.3 °C. The yield of deacetylated chitin (AKC-2) was 4.74 g/100 g, with deacetylation degree of 80.8%, viscosity average molecular weight of approximately 145.7 kDa, and amino-monosaccharide content of 97.06 g/100 g. The surface morphology of AKC-2 was similar to that of AKC-1, and the DTG_max was 311.5 °C. A mild, eco-friendly chitin preparation method and an amino-monosaccharide content detection method of raw material before chitin preparation are described in this study, which can provide technical support for comprehensive utilization of Antarctic krill resources.

Optimizing microwave-assisted hydrolysis conditions for monosaccharide composition analyses of different polysaccharides

Releasing all monosaccharides during acid hydrolysis for composition analysis of polysaccharides has been a time consuming process. In current study, an efficient (10 μL sample + 10 μL acid), sensitive, and quick monosaccharide composition analysis of polysaccharides was accomplished by using microwave-assisted HCl hydrolysis (10 min) of the polysaccharides followed by high-performance anion-exchange chromatography (HPAEC) combined with pulsed amperometric detection (PAD) analysis. Compared to the conventional hydrolysis procedure, this method is an efficient approach for monosaccharide composition analysis of acidic, basic, and neutral polysaccharides and particularly suited to polysaccharides that are difficult to hydrolyse fully such as chitosan, heparin and chondroitin sulfates.

Characterization of bioactive chitosan and sulfated chitosan from Doryteuthis singhalensis (Ortmann, 1891)

Chitosan was extracted from the pen of squid Doryteuthis singhalensis and characterized using FT-IR, NMR, CHN, SEM and DSC analysis. Purified chitosan was sulfated with chlorosulfonic acid in N,N-dimethylformamide and the added sulfate group was confirmed with FT-IR analysis. The molecular weight and degree of deacetylation (DDA) of chitosan was found 226.6kDa and 83.76% respectively. Chitosan exhibited potent antioxidant activity evidenced by reducing power, chelating ability on ferrous ions and scavenging activity on DPPH, superoxide and hydroxyl radicals. The anticoagulant assay using activated partial thromboplastin time (APTT) and prothrombin time (PT) showed chitosan as a strong anticoagulant. The results of this study showed possibility of using D. singhalensis pen as a non-conventional source of natural antioxidants and anticoagulant which can be incorporated in functional food formulations.