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Fish egg yolk extraction requires a protocol tailored to their unique properties, which differ significantly from chicken eggs. Here is a refined protocol for fish egg yolk extraction:
Collection and Washing: Collect fish eggs and wash them thoroughly with cold phosphate-buffered saline (PBS) to remove surface contaminants.
Homogenization: Place the washed eggs in a homogenizer or blender and add an equal volume of cold PBS. Homogenize until a uniform suspension is achieved. This step ensures efficient cell lysis and yolk release.
Centrifugation: Transfer the homogenate to centrifuge tubes and centrifuge at 10,000 x g for 20 minutes at 4°C to separate the yolk from other components. This step is crucial for yolk fractionation [1][2].
Supernatant Removal: Carefully remove the supernatant containing the yolk proteins and transfer to a clean container. Ensure minimal disturbance to avoid mixing with other fractions.
Filtration: Filter the supernatant through a fine mesh or cheesecloth to remove any remaining solid particles. This step helps in obtaining a clearer yolk extract [3].
Storage: Aliquot the extracted yolk and store at -80°C for long-term preservation or use immediately for downstream applications. This ensures the stability of the extracted components [4].
This protocol is optimized for the specific characteristics of fish eggs, ensuring efficient extraction and high-quality yolk material for further analyses.
Reference
[1] Kovacs-Nolan, J., & Mine, Y. (2012). Egg yolk antibodies for passive immunity.. Annual review of food science and technology, 3, 163-82 .
[2] Bourin, M., Gautron, J., Berges, M., Attucci, S., Blay, G. L., Labas, V., Nys, Y., & Réhault-Godbert, S. (2011). Antimicrobial potential of egg yolk ovoinhibitor, a multidomain Kazal-like inhibitor of chicken egg.. Journal of agricultural and food chemistry, 59 23, 12368-74 .
[3] Ptáček, M., Stádníková, M., Savvulidi, F., & Stádník, L. (2019). Ram Semen Cryopreservation Using Egg Yolk or Egg Yolk-free Extenders: Preliminary Results. Scientia Agriculturae Bohemica, 50, 103 - 96.
[4] Khatimah, K., Yusuf, M., Utami, R. F., Toleng, A., Masturi, Sahiruddin, & Masir, U. (2021). Comparison of chicken-egg yolk and duck-egg yolk in tris-citric acid as extender to maintain the quality of post-thawing Bali bull semen. IOP Conference Series: Earth and Environmental Science, 788.