Wednesday, July 11, 2007

Study Looks at Impact of Spray-Drying on Propolis Extract

Spray-Dried Propolis Extract, II: Prenylated Components of Green Propolis
Pharmazie, Volume: 62, Issue: 7, July 2007, Page(s): 488-492

Abstract: The effect of spray drying conditions on the chemical composition of Brazilian green propolis extract was investigated using a factorial design and high performance liquid chromatography.

The raw and dried extract contents of caffeic acid, p-coumaric acid, drupanin, isosakuranetin, artepillin C, baccharin and 2,2-dimethyl-6-carboxyethenyl-2H-1-benzopyran were quantified using veratraldehyde (3,4-dimethoxybenzaldehyde) as internal standard.

The baccharin content in spray-dried propolis was affected by the drying temperature with a 5% significance level, while the coumaric acid and drupanin contents were dependent on drying temperature at a 15% significance level.

The other chemical markers, caffeic acid, isosakuranetin, artepillin C and 2,2-dimethyl-6-carboxyethenyl-2H-1-benzopyran, showed to be independent of drying conditions. However, all the chemical markers showed some loss on drying, which varied from 30 to 50%.

The results showed that prenylated compounds are sensitive to drying, but their losses may be considerably reduced under low temperatures, around 40 °C. The antioxidant activity of the spray dried propolis was determined by the diphenylpicrylhydrazyl (DPPH) method and showed a quadratic dependency on the temperature; extract feed rate and the interaction between them.

However, spray dried propolis extracts presented antioxidant activities similar to the original propolis tincturae.

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