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Donkey Milk: A Novel Source of Functional Biomolecules in Biotechnology

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Milk from Equus asinus (donkey) is rapidly emerging as a valuable raw material in biotechnology, owing to its content of bioactive proteins and peptides with immune-regulatory, antioxidant, and anti-inflammatory properties. With advanced molecular tools now available, researchers can isolate and study these components for use in therapeutics, diagnostics, and functional nutrition.

Protein Isolation and Advanced Purification Technologies

Biotech workflows now employ state-of-the-art systems for extracting and analyzing donkey milk proteins:

OmniLyse enables efficient mechanical lysis of cells and extracellular vesicles, preserving native protein structures during sample prep.

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Cultrex matrices simulate 3D extracellular environments and are used to assess cellular behavior influenced by milk peptides.

a picture of a structure that looks like a structure

ExoQuick-TC / ExoQuick TC are precipitation kits widely used to isolate milk-derived exosomes, which may carry immunomodulatory peptides.

Immunological and Apoptotic Insights Using Donkey Milk Peptides

Some donkey milk immunoglobulins exhibit structural similarity to mouse IgG2a, a key antibody subclass involved in adaptive immunity. These proteins are frequently tested in apoptosis models using inhibitors like Ac-DEVD-CHO, a specific blocker of caspase-3, to evaluate their role in cell death regulation, inflammation control, and tissue repair.

Glycoprotein Targeting via Plant Lectins

Lectins such as Dolichos biflorus agglutinin (DBA), known to bind specific glycan structures, are often used to detect and quantify glycosylation patterns in donkey milk proteins. This is especially relevant in the development of biosensors, vaccine adjuvants, and targeted delivery systems.


How Are Scientists Studying These Bioactive Peptides?

To understand how these peptides affect the body, researchers often use Cultrex® extracellular matrix systems to simulate tissue environments. They also test peptide-induced apoptosis (cell death) with caspase inhibitors like Ac-DEVD-CHO, revealing how donkey milk compounds may help regulate inflammation or support gut epithelial healing.

An emerging field of interest is glycoprotein binding. Scientists are using plant-derived lectins like Dolichos biflorus agglutinin (DBA) to detect glycosylation patterns in donkey milk proteins. This type of analysis is critical for therapeutic development, especially for diseases involving immune dysfunction.

From Lab to Life: Applications in Biotech and Medicine

So where is this research heading? Here are some exciting applications:


Inflammatory diseases: Donkey milk-derived exosomes may support gut health in diseases like Crohn’s, potentially complementing biologics like CIMZIA™.

Nutraceuticals: Donkey milk peptides are entering the world of functional food — not just for their nutrition, but for their potential immune-regulating effects, similar to IgG2a.

Exosome therapy: With tools like ExoQuick-TC, scientists can develop new delivery systems for bioactive molecules using milk-derived nanocarriers.

Applications in Human and Animal 

Donkey milk peptides may serve as natural immunonutrients or adjunct therapies in biomedical contexts, including:

Inflammatory bowel diseases: 
such as Crohn’s, where natural compounds may complement biologics like CIMZIA, a TNF-α inhibitor.                           purple and black round textile
Pediatric and geriatric nutrition:
due to analogues of IgG2a that may help boost mucosal and systemic immunity. fruit salad inside bowl beside glass of milk on brown board
Functional food biotechnology:
where bioactive components are incorporated into nutraceuticals with scientifically validated health claims.    person holding round clear container

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