Researchers have developed a targeted analytical method capable of measuring six rare ginsenosides in boiled eggs laid by Black Silkie hens whose diets were supplemented with ginseng extraction residue, an agricultural and herbal-processing by-product that retains ginsenoside-related compounds. The study, published in Chemical and Biological Technologies in Agriculture, established an ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) approach for simultaneously determining Rg2, Rg3, Rh1, Rh2, F1, and compound K (CK) in boiled egg yolk and albumen under different dietary inclusion levels.

The analytical method showed linearity over a concentration range of 1 to 100 ng/mL, with precision relative standard deviations of 1.27 to 2.68 percent and spike recoveries of 80.72 to 87.07 percent.

No target rare ginsenosides were detected in boiled eggs from the control group, which had not received the residue-supplemented feed. In the 20 percent dietary inclusion group, Rg2 concentrations measured 4.697 plus or minus 0.895 micrograms per gram in yolk and 2.287 plus or minus 0.297 micrograms per gram in albumen. The corresponding Rg3 concentrations were 6.061 plus or minus 0.482 micrograms per gram in yolk and 2.982 plus or minus 0.625 micrograms per gram in albumen.

Rg2 and Rg3 emerged as the predominant target ginsenosides, with higher mean concentrations in yolk than in albumen. Albumen Rh1 and Rg2, along with yolk Rg3, were higher in the 20 percent inclusion group than in the 10 percent group, a difference the authors reported as statistically significant at p less than 0.05. Albumen Rh1 and Rg2 and yolk Rg3 were each higher at the 20 percent inclusion level than at 10 percent, but the study did not establish a dose-response pattern for the target ginsenosides overall.

One of the more intriguing findings is that Rg2 and Rg3 were detected in the eggs of supplemented hens despite being undetected in the tested ginseng residue itself and in the basal diet. The authors note that the origin of the detected compounds requires precursor tracking and paired analysis of raw and boiled eggs to distinguish biological transformation occurring within the hen from heat-related transformation during boiling. Until such paired analyses are completed, the mechanism by which these rare ginsenosides appear in the boiled eggs remains unresolved.

The occurrence and distribution of rare ginsenosides in eggs after dietary supplementation with this residue had remained poorly characterized, which the new study addresses by providing a validated quantitative framework.

The authors conclude that dietary supplementation with ginseng extraction residue was associated with the detection of rare ginsenosides in boiled eggs from Black Silkie hens, and that the findings provide an analytical basis for evaluating this residue as a feed resource for ginsenoside-containing egg products. The framing is deliberately cautious: the study reports associations between feed supplementation and compound detection, not a demonstrated health benefit of consuming the resulting eggs.

Several limitations shape how the results should be interpreted. The work measured concentrations in boiled eggs under controlled dietary inclusion levels in a single breed of laying hen, and the authors themselves flag that precursor tracking and paired raw-versus-boiled egg analyses are needed before the biological or thermal origins of the detected compounds can be distinguished. Any broader implications for egg quality, hen health, or human nutrition would require further research beyond the scope of this analytical study.

For the functional food and feed industries, the study offers a concrete starting point: a validated UPLC-MS/MS method with defined sensitivity, precision, and recovery parameters that can be applied to future evaluations of ginseng by-products in poultry diets.

Subject of Research: Detection and distribution of six rare ginsenosides in boiled eggs from laying hens fed ginseng extraction residue

Article Title: Targeted determination and distribution of six rare ginsenosides in boiled eggs from laying hens fed ginseng extraction residue

Article References: Zhou, T., Jiang, J., Le, Y., Feng, Z., & Liu, Z. (2026). Targeted determination and distribution of six rare ginsenosides in boiled eggs from laying hens fed ginseng extraction residue. Chemical and Biological Technologies in Agriculture. https://doi.org/10.1186/s40538-026-01128-2

Image Credits: AI Generated

DOI: 10.1186/s40538-026-01128-2

Keywords: ginsenosides, ginseng extraction residue, laying hens, boiled eggs, UPLC-MS/MS, egg yolk, albumen, feed supplementation, Black Silkie hens, functional food, Targeted, determination