Many previous studies have reported the antibacterial
activity, phenolic content or antioxidant activities of spices
and herbs. But it was not easy to compare directly the results of
different studies and to establish reasonable relationships
between antibacterial activity, phenolic content and antioxidant
activity because of the low number of spice and herb samples
tested, different determination methods and different bacterial
strains used. Previous results (Shan et al., 2005) found high
correlations, based on the analysis of a large number of samples
and the wide ranges in total phenolic content and antioxidant
capacity. The current study investigated a total of 46 spice and
herb extracts from different regions and resulted in good linear
relationships between antibacterial activity and total phenolic
content. The results emphasized the importance of phenolic
compounds in the antibacterial activity of spice and herb
extracts and also indicated that the phenolic compounds
significantly contributed to their antibacterial activity. In
addition, the present study shows that highly positive relationships
also exist between the antibacterial activity and
antioxidant capacity of the extracts. Previous work (Cai et al.,
2004; Shan et al., 2005) showed that there were highly positive
linear correlations between antioxidant capacity and total phenolic content of a large number of spices and herbs
(including most of the samples tested in this study). The present
work shows that antibacterial activity is closely related to the
concentration of phenolic compounds and thus to the
antioxidant capacity of the extracts.
Many previous studies have reported the antibacterialactivity, phenolic content or antioxidant activities of spicesand herbs. But it was not easy to compare directly the results ofdifferent studies and to establish reasonable relationshipsbetween antibacterial activity, phenolic content and antioxidantactivity because of the low number of spice and herb samplestested, different determination methods and different bacterialstrains used. Previous results (Shan et al., 2005) found highcorrelations, based on the analysis of a large number of samplesand the wide ranges in total phenolic content and antioxidantcapacity. The current study investigated a total of 46 spice andherb extracts from different regions and resulted in good linearrelationships between antibacterial activity and total phenoliccontent. The results emphasized the importance of phenoliccompounds in the antibacterial activity of spice and herbextracts and also indicated that the phenolic compoundssignificantly contributed to their antibacterial activity. Inaddition, the present study shows that highly positive relationshipsalso exist between the antibacterial activity andantioxidant capacity of the extracts. Previous work (Cai et al.,2004; Shan et al., 2005) showed that there were highly positivelinear correlations between antioxidant capacity and total phenolic content of a large number of spices and herbs(including most of the samples tested in this study). The presentwork shows that antibacterial activity is closely related to theconcentration of phenolic compounds and thus to theantioxidant capacity of the extracts.
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