A plant-derived mucilaginous extract for mimicking cervical fluid in fertility and reproductive applications

Background

Cervical fluid, produced by the endocervical glands, plays a crucial role in human fertility by modulating its properties throughout the menstrual cycle. During the fertile phase, this mucus becomes thin, stretchy, and alkaline, creating an optimal environment for sperm survival and transport into the uterus. Its unique physical characteristics, such as high Spinnbarkeit (stretchability) and ferning patterns under microscopy, are essential for facilitating sperm passage and protecting against pathogens. Clinically, cervical fluid is utilized in fertility assessments, sperm motility testing, and as a medium for sperm storage and insemination. However, the collection of natural cervical fluid in sufficient quantities is challenging, and its beneficial properties are restricted to a narrow window within the menstrual cycle, limiting its broader application in reproductive medicine.

Current approaches to address these limitations have relied on either the direct use of natural cervical mucus or on synthetic or semi-synthetic substitutes that often fail to fully replicate the complex physical and biochemical environment of fertile-phase cervical fluid. Natural mucus is not only difficult to obtain in large volumes but also varies significantly in quality and composition depending on the donor and cycle phase, introducing inconsistency in clinical outcomes. Existing artificial substitutes may lack critical features such as selective permeability for motile, morphologically normal sperm, appropriate viscoelasticity, or the ability to support sperm viability and motility over time. These shortcomings hinder their effectiveness in assisted reproductive technologies, sperm function diagnostics, and cryopreservation, underscoring the need for a reliable, scalable, and biologically compatible alternative.

Technology

This technology is an artificial cervical fluid substitute created from a mucilaginous extract of okra (Abelmoschus esculentus) fruit. The extract is produced by aqueous extraction of sanitized, sliced okra, followed by filtration to obtain a clear, viscous fluid. This fluid closely mimics the properties of fertile-phase human cervical mucus, exhibiting key characteristics such as high Spinnbarkeit (stretchability of at least 10 cm), distinctive ferning patterns under microscopy due to salt crystallization, and selective permeability that favors the passage of motile, morphologically normal spermatozoa. Composed primarily of polysaccharides like rhamnose, galactose, and uronic acids, along with proteins, the extract supports sperm viability and motility. It is designed for use in a variety of fertility-related applications, including sperm storage, cryopreservation (often combined with agents like glycerol and egg yolk), artificial insemination, in vitro fertilization (IVF), diagnostic sperm function testing, vaginal lubrication, and as a lubricant coating for condoms.

What differentiates this technology is its ability to replicate both the physical and biological functions of natural cervical mucus using a plant-derived, scalable, and easily prepared material. Unlike natural cervical fluid, which is difficult to collect in large volumes and is only available during specific phases of the menstrual cycle, the okra extract can be produced consistently and in sufficient quantities. Experimental results show that spermatozoa not only penetrate the extract more effectively than standard media, but also retain higher motility, better morphology, and improved membrane integrity, particularly after cryopreservation. Its selective permeability enables diagnostic use in assessing sperm quality, while its anti-adhesive and potential antimicrobial properties offer additional health benefits. This combination of biomimicry, versatility across reproductive technologies, and practical advantages in preparation and scalability sets the okra-based substitute apart from existing solutions.

Benefits

• Mimics key physical and biological properties of fertile-phase human cervical mucus, including stretchability and ferning patterns.
• Selective permeability supports penetration and viability of motile, morphologically normal spermatozoa.
• Enhances sperm motility, morphology, and longevity in storage and post-cryopreservation.
• Serves as a versatile medium for sperm storage, cryopreservation, artificial insemination, and in vitro fertilization.
• Enables diagnostic sperm function testing by facilitating sperm penetration assessment.
• Can be used as a vaginal lubricant and condom coating, potentially providing antimicrobial benefits.
• Provides a scalable, practical alternative to natural cervical mucus, overcoming collection and variability limitations.

Applications

• Sperm storage and cryopreservation
• Artificial insemination medium
• In vitro fertilization support
• Diagnostic sperm function testing
• Fertility-friendly vaginal lubricant

Additional info

A mucilaginous extract from okra fruit serves as an artificial cervical fluid substitute. This preparation exhibits Spinnbarkeit, ferning patterns, and selective permeability to motile, morphologically normal spermatozoa, supporting their viability. Composed of polysaccharides and protein, it is utilized in sperm storage, cryopreservation, artificial insemination, IVF, and diagnostic sperm function testing.