Antioxidant and antimicrobial properties of Teucrium arduini L. ( Lamiaceae) flower and leaf infusions ( Teucrium arduini L. antioxidant capacity)

• Published in: Food and chemical toxicology 2010, Vol.48 (1), p.113-119
• Main Authors: Šamec, D., Gruz, J., Strnad, M., Kremer, D., Kosalec, I., Grubešić, R. Jurišić, Karlović, K., Lucic, A., Piljac-Žegarac, J.
• Format: Article
• Language: English
• Subjects: Anti-Infective Agents - chemistry; Anti-Infective Agents - pharmacology; Antimicrobial activity; antimicrobial properties; Antioxidant activity; Antioxidants - chemistry; Antioxidants - pharmacology; Bacteria - drug effects; Benzothiazoles - chemistry; Biological and medical sciences; Biphenyl Compounds; Chromans - pharmacology; Croatia; Ferric Compounds - chemistry; flowers; Flowers - chemistry; Free Radical Scavengers - chemistry; Free Radical Scavengers - pharmacology; Fungi - drug effects; General pharmacology; Glycosides - chemistry; Glycosides - pharmacology; herbal medicines; Indicators and Reagents; leaves; Medical sciences; medicinal plants; Microbial Sensitivity Tests; Pharmacognosy. Homeopathy. Health food; Pharmacology. Drug treatments; Phenolic acids; phenolic compounds; Phenols - chemistry; Phenols - pharmacology; Picrates; plant extracts; Plant Extracts - chemistry; Plant Extracts - pharmacology; Plant Leaves - chemistry; Reducing Agents - chemistry; Sulfonic Acids - chemistry; tea (beverage); Teucrium; Teucrium - chemistry; Teucrium arduini; Teucrium arduini L; Total phenols
• ISSN: 0278-6915; 1873-6351
• DOI: 10.1016/j.fct.2009.09.026

Antioxidant and antimicrobial activities, as well as total phenol (TP, Folin–Ciocalteu method) and phenolic acid (UPLC–MS/MS) contents of leaf and flower infusions of Teucrium arduini L. from six different mountainous localities in Croatia (Učka, Vošac, Sveti Jure, Snježnica, Vaganac, Šušanj) were analysed in this study. Antioxidant capacity was evaluated using the ferric reducing/antioxidant power (FRAP) assay, as well as 2,2-diphenyl-1-picrylhydrazyl (DPPH), and 2,2′-azinobis (3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical scavenging assays. The antioxidant potency composite index (ACI), giving equal weight to all three methods used to quantify antioxidant capacity, was the highest for the sample from Vošac (96.7) among flower infusions, while maximum ACI (100) was determined for the infusion from Učka among leaf infusions. Strong positive correlation was found between the total phenols and ACI for leaf ( r = 0.953) and flower ( r = 0.977) infusions. Our results point to significantly ( p < 0.05) different TP content between leaf and flower infusions, as well as across localities. Leaf infusions of T. arduini from Šušanj exhibited marked antibacterial activity against Staphylococcus aureus, while none of the tested infusions exhibited antimicrobial activity against gram-negative bacterial species, or the tested fungal species.