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[Comparison of protein assays for ejiao]
Summary
Ejiao demonstrates spectral and chemical similarities to gelatin, validating its protein content through multiple photometric assays. These findings support Ejiao
Area of Science:
- Biochemistry
- Pharmacognosy
- Analytical Chemistry
Background:
- Ejiao, a traditional Chinese medicine derived from donkey-hide gelatin, requires rigorous quality control.
- Standardized analytical methods are crucial for verifying the composition and authenticity of Ejiao.
Purpose of the Study:
- To confirm the biochemical identity of Ejiao by comparing its spectral and chemical properties to reference gelatin.
- To validate the accuracy of photometric protein assays for Ejiao using established chemical procedures.
Main Methods:
- Murphy's UV spectrophotometry was employed to analyze spectral characteristics.
- Gornall's biuret and Lowry's Folin phenol procedures were utilized for color-yielding reactions and protein quantification.
- Kjeldahl nitrogen determination served as a reference method for protein content.
Main Results:
- Ejiao displayed identical spectral characteristics to reference gelatin under UV spectrophotometry.
- Color-yielding reactions confirmed Ejiao's composition consistent with gelatin.
- Photometric protein assays showed results in close approximation to each other and comparable to Kjeldahl nitrogen determination.
Conclusions:
- Ejiao shares key biochemical and spectral properties with gelatin.
- Established photometric methods are reliable for quantifying Ejiao's protein content, ensuring product quality and authenticity.