[Objective] The aim was to analyze content of flavones in honey of pomegranate flowers. [Method] Contents of total flavones in 24 honey samples of pomegranate flowers from Mengzi City in 2011 and 2012 were measured as...[Objective] The aim was to analyze content of flavones in honey of pomegranate flowers. [Method] Contents of total flavones in 24 honey samples of pomegranate flowers from Mengzi City in 2011 and 2012 were measured as per- spectrophotometry method with acetone as an extractant and rutin as a control. [Result] The average content of flavones in honey of pomegranate flowers was at （2.36±1.36）mg/100 g in 2011 and significantly higher than that in 2012 at （1.71± 0.53）mg/100 g. Analysis was conducted on flavones content in different batches and the results indicated that content of flavones in honey in different batches changed from increasing to decreasing, namely, the content was maximal in peak flowering stage, followed by late flowering stage and initial flowering stage. [Conclusion] The research provides references for development, use and function exploration of the honey of pomegranate flowers.展开更多
150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples f...150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples from twelve locations （40%）, in 2010, in samples from four locations （13.3%） and in 2011, in samples from three locations （10%）. Altogether 15 different residues in pollen were found in 2009, two in year 2010 and five in 2011. Residues found in the pollen samples ranged from 0.001 mg/kg to 76 mg/kg. The highest number （twelve） of residues was found in pollen from the intensive fruit farming locations and from the intensive viticulture locations （eight）. The residues were mostly from the fungicide group （69%）. Insecticide residues （chlorpyrifos-ethyl, methoxyfenozide, thiacloprid） were found in the pollen samples from eight locations. Residues in the pollen did not statistically influence the development of the honeybee colonies or infestation rate of Nosema （Nosema spp.）, or viruses ABPV （acute bee paralysis virus）, SBV （sacbrood virus）, DWV （deformed wing virus）, and BQCV （black queen cell virus））.展开更多
Ninety honey samples of five different floral origins （chestnut, eucalyptus, citrus, multifloral and sulla） from nine areas of southern Italy, were screened to evaluate the polyphenol content by spectrphotometric me...Ninety honey samples of five different floral origins （chestnut, eucalyptus, citrus, multifloral and sulla） from nine areas of southern Italy, were screened to evaluate the polyphenol content by spectrphotometric methods, the antioxidant activity by ABTS （2,2＇ -azino-bis-（3-ethylbenzothiazoline-6-sulfonic acid？ diamonium salt, FRAP （ferric reducing antioxidant power） and DPPH （I,I-diphenyl-2-picrylhydrazyl） assays, and the colorimetric characteristics by spectrophotometric and CIE （Commission Internationale de I＇Eclairage） L ＊a＊b＊ methods. Moreover, the correlations between the analysed parameters were studied. Overall, the results showed that all the honey samples presented high total phenolic and flavonoid contents （12.23 mg gallic acid equivalent/lOOg honey and 8.16 mg quercetin equivalent/lOOg honey, respectively）, and a high antioxidant activity （59.17%, 66.50% and 349.11 11M Fe （II） for ABTS, DPPH and FRAP assays, respectively）, but those results differ widely according to the honey types, suggesting that honey composition has been influenced by its floral and geographical origin. In particular, the darkest honeys, such as chestnut honey （L ＊ = 59.94; 1.26 AU）, showed the highest polyphenol content and the highest antioxidant activity. Honeys from the areas with major anthropogenic activities and high population density presented the highest antioxidant activity. Correlations between the analysed parameters were statistically significant （P 〈 0.05）, suggesting that the polyphenol content is correlated with the antioxidant activity and colour of honey.展开更多
基金Supported by Youth Entrepreneurship Foundation of Institute of Sericulture and Apiculture,Yunnan Academy of Agricultural Sciences (QC2010002)Special Funds of National Modern Agricultural and bee industry Technology System (CARS-45-SYZ17)Science&Technology Department Project of Yunnan Province (2011BB012)~~
文摘[Objective] The aim was to analyze content of flavones in honey of pomegranate flowers. [Method] Contents of total flavones in 24 honey samples of pomegranate flowers from Mengzi City in 2011 and 2012 were measured as per- spectrophotometry method with acetone as an extractant and rutin as a control. [Result] The average content of flavones in honey of pomegranate flowers was at （2.36±1.36）mg/100 g in 2011 and significantly higher than that in 2012 at （1.71± 0.53）mg/100 g. Analysis was conducted on flavones content in different batches and the results indicated that content of flavones in honey in different batches changed from increasing to decreasing, namely, the content was maximal in peak flowering stage, followed by late flowering stage and initial flowering stage. [Conclusion] The research provides references for development, use and function exploration of the honey of pomegranate flowers.
文摘150 pollen samples collected between the years 2009 and 2011 from 30 locations, divided according to agricultural practice were analysed for the presence of pesticides. In 2009, residues were found in pollen samples from twelve locations （40%）, in 2010, in samples from four locations （13.3%） and in 2011, in samples from three locations （10%）. Altogether 15 different residues in pollen were found in 2009, two in year 2010 and five in 2011. Residues found in the pollen samples ranged from 0.001 mg/kg to 76 mg/kg. The highest number （twelve） of residues was found in pollen from the intensive fruit farming locations and from the intensive viticulture locations （eight）. The residues were mostly from the fungicide group （69%）. Insecticide residues （chlorpyrifos-ethyl, methoxyfenozide, thiacloprid） were found in the pollen samples from eight locations. Residues in the pollen did not statistically influence the development of the honeybee colonies or infestation rate of Nosema （Nosema spp.）, or viruses ABPV （acute bee paralysis virus）, SBV （sacbrood virus）, DWV （deformed wing virus）, and BQCV （black queen cell virus））.
文摘Ninety honey samples of five different floral origins （chestnut, eucalyptus, citrus, multifloral and sulla） from nine areas of southern Italy, were screened to evaluate the polyphenol content by spectrphotometric methods, the antioxidant activity by ABTS （2,2＇ -azino-bis-（3-ethylbenzothiazoline-6-sulfonic acid？ diamonium salt, FRAP （ferric reducing antioxidant power） and DPPH （I,I-diphenyl-2-picrylhydrazyl） assays, and the colorimetric characteristics by spectrophotometric and CIE （Commission Internationale de I＇Eclairage） L ＊a＊b＊ methods. Moreover, the correlations between the analysed parameters were studied. Overall, the results showed that all the honey samples presented high total phenolic and flavonoid contents （12.23 mg gallic acid equivalent/lOOg honey and 8.16 mg quercetin equivalent/lOOg honey, respectively）, and a high antioxidant activity （59.17%, 66.50% and 349.11 11M Fe （II） for ABTS, DPPH and FRAP assays, respectively）, but those results differ widely according to the honey types, suggesting that honey composition has been influenced by its floral and geographical origin. In particular, the darkest honeys, such as chestnut honey （L ＊ = 59.94; 1.26 AU）, showed the highest polyphenol content and the highest antioxidant activity. Honeys from the areas with major anthropogenic activities and high population density presented the highest antioxidant activity. Correlations between the analysed parameters were statistically significant （P 〈 0.05）, suggesting that the polyphenol content is correlated with the antioxidant activity and colour of honey.
