1. How Do We Test Mulberry Leaf Flavonoids for Quality?

We ensure the quality and consistency of mulberry leaf flavonoids through a combination of advanced analytical techniques. First, laboratories primarily use High-Performance Liquid Chromatography (HPLC) to quantify the total flavonoid content and identify individual compounds . This method provides a reliable “fingerprint” of the extract, allowing us to verify its composition against established standards .

For even greater sensitivity and detail, we employ Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS). This powerful technique can detect and quantify specific prenylated flavonoids, like morusin and mulberrin, at very low concentrations . Additionally, Ultra-Performance Liquid Chromatography-Electrospray Ionization-Tandem Mass Spectrometry (UPLC-ESI-MS/MS) helps us identify a wide spectrum of up to 118 different flavonoid metabolites, ensuring a comprehensive profile of the extract . During the extraction process, we also use Ultraviolet (UV) spectrophotometry for quick preliminary screenings to optimize parameters and track flavonoid yield .

2. What Are Mulberry Leaf Flavonoids and Where Do They Come From?

Mulberry leaf flavonoids are a diverse group of polyphenolic compounds. Their main components include various subclasses, such as flavones (e.g., luteolin derivatives), flavonols (e.g., quercetin, kaempferol, astragalin, rutin), and flavanones . Key individual flavonoids frequently identified are rutin, astragalin, isoquercitrin, and various glycosides of quercetin and kaempferol . The specific composition can vary based on the mulberry species, origin, and harvest time .

We source these flavonoids from the dried leaves of the mulberry tree (Morus alba L. and other Morus species) . The process begins with harvesting the leaves, often at a specific growth stage to maximize bioactive content . We then carefully dry the leaves—using methods like shade-drying or controlled hot-air drying—to preserve the delicate flavonoids . Finally, we extract the compounds using solvents like ethanol and water, often with ultrasound-assisted technology to improve efficiency and yield .

3. How Do We Use Different Grades of Mulberry Leaf Flavonoids?

Depending on the purity and application, we can use mulberry leaf flavonoids in various ways:

Dietary Supplements & Nutraceuticals (20–50% flavonoids)
We incorporate these extracts into capsules, tablets, and powders. These products often target blood sugar management, cholesterol support, and general antioxidant protection.

Functional Foods & Beverages (1–10% flavonoids)
We add these to formulations like teas, health drinks, noodles, and baked goods to enhance their nutritional profile and provide functional health benefits . The concentration is carefully balanced to ensure efficacy without negatively impacting taste or texture.

Cosmetic & Skincare Products (0.5–5% flavonoids)
We use purified extracts in serums, creams, and lotions. Here, they serve as powerful antioxidants to protect the skin from environmental stressors and provide anti-inflammatory benefits.

Research & High-Purity Standards (≥90% flavonoids)
Scientists use highly purified individual flavonoids, like rutin or astragalin, as reference standards for analytical testing or in clinical studies to investigate their specific mechanisms of action .

4. What Are Its Physical Properties?

Understanding these characteristics is essential for successful formulation:

• Solubility: Mulberry leaf flavonoids are generally soluble in polar solvents like ethanol, methanol, and water-alcohol mixtures . Their solubility in pure water is often limited, so formulators may use co-solvents, solubilizers, or cyclodextrins to improve incorporation into water-based products.

• Color: The extract typically appears as a yellow-brown to greenish-yellow fine powder. The exact shade can vary depending on the concentration of flavonoids and the specific extraction method used.

5. How Should We Store Mulberry Leaf Flavonoids?

Proper storage is crucial for maintaining the stability and bioactivity of these sensitive compounds:

• First, store the extract in a cool, dry place, away from direct light and heat.

• Next, use airtight, light-resistant containers to prevent oxidation and moisture absorption. Studies show that vacuum storage is particularly effective at preserving these compounds .

• Additionally, for long-term storage, we recommend refrigeration at 2–8°C (36–46°F) to further slow any potential degradation.

• Finally, avoid repeated opening of the container, which can expose the contents to humidity and oxygen.

Conclusion

Mulberry leaf flavonoids offer a versatile and scientifically validated ingredient for a wide range of health and wellness applications. By understanding how we test them, what they contain, how to use different grades, and how to store them properly, you can confidently incorporate these natural compounds into your products. Always partner with suppliers who provide transparent quality documentation, including Certificates of Analysis (CoA) that detail the flavonoid profile and confirm the absence of contaminants.

Interested in exploring high-quality mulberry leaf flavonoids for your next formulation?
Contact us today for technical specifications, formulation support, and samples tailored to your needs.