Preparation and the functional properties of water extract and alkaline extract of royal jelly

Water extract (WSR) and an alkaline extract (ASR) were prepared from fresh royal jelly from Chinese bees. The yields were about 8.3 and 6.3% on a dry weight basis, respectively. On SDS–PAGE analysis, the protein patterns of the two extracts were very similar, but not identical. Antioxidant activities, in both extracts, increased, depending on the concentration of the sample. The scavenging activities, against superoxide radical of WSR and ASR...