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A rapid method to isolate soluble royal jelly proteins.
Reo Nozaki1, Shogo Tamura, Aimi Ito
1Division of Gastroenterologic and General Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Japan.
Food Chemistry
|February 28, 2013
Summary
A new method isolates soluble royal jelly (RJ) proteins (SRJPs) faster than conventional techniques. This ultracentrifugation approach yields 20-fold more SRJPs, separating major RJ proteins (MRJPs) into distinct layers.
Area of Science:
- Biochemistry
- Protein Chemistry
- Apiculture
Background:
- Soluble royal jelly proteins (SRJPs), including the major RJ protein (MRJP) family, are crucial for royal jelly's physiological effects.
- Conventional SRJP isolation methods using dialysis and centrifugation are time-consuming.
Purpose of the Study:
- To develop a simplified and more efficient method for isolating SRJPs from royal jelly.
- To compare the yield of SRJPs obtained by the new method versus conventional procedures.
Main Methods:
- A novel method utilizing 1-hour ultracentrifugation to separate SRJPs from royal jelly without dialysis.
- Analysis of separated SRJP layers using size-exclusion HPLC, SDS-PAGE, and 2-DE.
- Characterization of major RJ protein (MRJP) forms, including MRJP1 oligomers.
Main Results:
- The new ultracentrifugation method achieved a 20-fold higher yield of SRJPs compared to conventional methods.
- SRJPs were successfully separated into distinct layers: MRJP2 and MRJP3 in the upper/middle layers, and MRJP1 (predominantly oligomeric) in the lower layer.
- The isolation procedure time was significantly reduced by eliminating the dialysis step.
Conclusions:
- A simple and rapid ultracentrifugation method effectively isolates SRJPs from royal jelly.
- This method enhances SRJP yield and provides distinct fractions of MRJP1, MRJP2, and MRJP3.
- The findings offer a more efficient approach for obtaining valuable royal jelly proteins for research and potential applications.
