Application of Ultrafiltration Membrane Technology in the Extraction of Polysaccharides from Honeysuckle (Lonicera japonica)

Honeysuckle polysaccharides (HPS) are natural bioactive components with antioxidant and other beneficial properties, and are in high demand across multiple industries. Traditional extraction processes suffer from low efficiency and significant activity loss. Shandong Qisheng ultrafiltration membrane technology, with its molecular-level separation precision and mild operating conditions, has become the core solution to these challenges.

Shandong Qisheng Membrane Separation employs a customized "hot water extraction – ultrafiltration refining" process: after hot water extraction of honeysuckle, the extract is passed through a tailored 10–50 kDa ultrafiltration membrane system, which precisely removes proteins and small-molecule impurities under ambient temperature and low pressure while completely retaining the polysaccharides. This technology increases polysaccharide purity by over 20%, improves antioxidant activity retention by 15%–22%, eliminates the need for large quantities of organic solvents, and reduces energy consumption by 50%. The system is constructed from food-grade materials compliant with GMP standards and is suitable for large-scale production. After adopting this technology, one enterprise saw its extraction yield increase from 8.5% to 12.3%, generating significant annual economic benefits. For further technical inquiries, please contact us for customized solutions.

Based on the molecular characteristics of honeysuckle polysaccharides and extraction requirements, an integrated process of "hot water extraction – ultrafiltration refining – concentration and drying" has been designed to achieve synergistic enhancement of polysaccharide yield and activity preservation. The specific process is as follows: First, the pulverized honeysuckle raw material is added to deionized water at a solid-to-liquid ratio of 1:20–1:30, and extracted under constant temperature at 80–90°C for 1–2 hours to obtain a crude honeysuckle extract. Subsequently, plate-and-frame filtration is employed to remove large particulate residues and suspended solids, yielding a pretreated liquid with relatively high clarity. Next, an ultrafiltration membrane system with a molecular weight cut-off of 10–50 kDa is used to refine the pretreated liquid under cross-flow filtration conditions at 0.1–0.3 MPa and 25–35°C, effectively removing proteins, small-molecule pigments, monosaccharides, inorganic salts, and other impurities. The retentate collected is the crude polysaccharide solution. Finally, the crude polysaccharide solution is concentrated by reverse osmosis and then subjected to freeze-drying to obtain high-quality honeysuckle polysaccharide powder. In this process, the ultrafiltration membrane refining step is the key to improving polysaccharide purity and preserving bioactivity.

II. Core Technical Advantages of Ultrafiltration Membrane Technology for Honeysuckle Polysaccharide Extraction

1. Precise Fractionation and Impurity Removal, Enhancing Polysaccharide Purity and Quality: Ultrafiltration membranes enable precise separation based on molecular size. By selecting the appropriate molecular weight cut-off, proteins (removal rate ≥85%), small-molecule impurities (removal rate ≥90%), and colloidal particles can be selectively removed from the honeysuckle extract, while the polysaccharides are completely retained. The purity of polysaccharides after ultrafiltration is increased by 20%–30% compared to traditional alcohol precipitation processes, with lighter color and better solubility, substantially reducing subsequent purification costs.

2. Mild Operating Conditions for Maximum Antioxidant Activity Retention: The entire ultrafiltration process operates under ambient temperature and low pressure, without the need for high-temperature heating or chemical reagents. This effectively avoids polysaccharide chain degradation and destruction of active groups caused by high temperatures in conventional processes. Experimental data demonstrate that honeysuckle polysaccharides extracted using ultrafiltration membrane technology exhibit DPPH radical scavenging activity, hydroxyl radical scavenging activity, and total reducing power that are 15%–22%, 12%–18%, and 10%–15% higher, respectively, than those obtained through traditional processes, indicating significantly enhanced antioxidant activity.

3. Simplified Process Flow with Enhanced Production Efficiency: Traditional processes require multiple steps of alcohol precipitation, centrifugation, and washing for polysaccharide purification. In contrast, ultrafiltration membrane technology accomplishes impurity removal and preliminary concentration simultaneously, shortening the extraction and purification process by over 40%. Furthermore, the ultrafiltration membrane system enables continuous operation with processing capacities flexibly customizable from 0.5 m³/h to 30 m³/h, achieving production efficiency 3–5 times higher than traditional batch processes, making it well-suited for large-scale production.

4. Energy Conservation, Consumption Reduction, and Lower Overall Production Costs: The ultrafiltration membrane system eliminates the need for large quantities of organic solvents (such as ethanol), reducing costs associated with solvent procurement, recovery, and environmental treatment. It also eliminates the high-temperature evaporation and concentration step required in traditional processes, cutting energy consumption by 50%–60%. In addition, membrane cleaning is primarily water-based, reducing cleaning agent consumption by over 70%, thus lowering both operational and maintenance costs while minimizing environmental impact.

5. Strong Regulatory Compliance for Multi-Sector Applications: All membrane modules and piping in contact with the liquid are manufactured from food-grade 316L stainless steel, PVDF, and other materials that comply with food hygiene standards and GMP requirements. The extracted honeysuckle polysaccharides can be directly applied in food additives, health product raw materials, and pharmaceutical intermediates without additional material safety processing.

III. Application Case and Industrial Value

After a health product enterprise upgraded its honeysuckle polysaccharide production line using Shandong Qisheng ultrafiltration membrane technology, the following significant improvements were achieved: The honeysuckle polysaccharide extraction yield increased from 8.5% (conventional process) to 12.3%, with product purity reaching above 85%. In antioxidant activity testing, the DPPH radical scavenging rate increased from 62% to 78%, substantially enhancing the product's core competitiveness. Additionally, the production line achieved a 90% reduction in organic solvent consumption, a 55% reduction in energy costs, and an annual economic benefit increase exceeding RMB 3 million. This case demonstrates that ultrafiltration membrane technology not only improves the extraction efficiency and quality of honeysuckle polysaccharides but also enhances their core bioactivity, providing effective technical support for the high-value development of bioactive components from medicinal and edible plants.

IV. Future Outlook

Against the trend of high-value development of natural products, improving the extraction efficiency and activity retention of honeysuckle polysaccharides is a core industry requirement. Ultrafiltration membrane technology, with its advantages of precise impurity removal, mild activity preservation, energy efficiency, and high productivity, effectively addresses the bottlenecks of traditional processes, offering a reliable solution for large-scale, high-quality production of honeysuckle polysaccharides. In the future, with continuous advancements in membrane material performance and precise regulation of process parameters, the application of ultrafiltration membrane technology in the extraction of polysaccharides from honeysuckle and other medicinal and edible plants will become even more extensive, driving quality improvement and value enhancement in the natural bioactive components industry.

For any technical challenges in plant polysaccharide extraction or membrane separation technology applications, please feel free to contact the Shandong Qisheng Membrane Separation technical team for customized solutions.