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Chemical Profiling, Enzyme Inhibitory Activity and Antioxidant Capacity of South African Herbal Teas: Buddleja saligna , Lippia javanica , L. scaberrima and Phyla dulcis

Herbal teas are used in South Africa as digestives to lower glycaemia and for other indications. However, the chemical composition of the infusions and their effect on enzymes related to metabolic syndrome is poorly known. The composition of infusions and methanol extracts of (Scrophulariaceae), , ,...

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Published in:Antioxidants 2024-10, Vol.13 (10), p.1219
Main Authors: Nina, Nélida, Burgos-Edwards, Alberto, Theoduloz, Cristina, Tripathy, Satyajit, Matsabisa, Motlalepula Gilbert, Schmeda-Hirschmann, Guillermo
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description Herbal teas are used in South Africa as digestives to lower glycaemia and for other indications. However, the chemical composition of the infusions and their effect on enzymes related to metabolic syndrome is poorly known. The composition of infusions and methanol extracts of (Scrophulariaceae), , , and (Verbenaceae) was assessed and the effect of the infusions and extract was determined towards α-glucosidase, α-amylase, and pancreatic lipase. The commercial herbal products were extracted separately with MeOH or hot water to obtain the extract/infusion for comparative studies. Total phenolic, total flavonoid and antioxidant capacity were assessed. The fingerprints of the MeOH extracts and infusions were compared by HPLD-DAD. The extract constituents were tentatively identified by HPLC-MS/MS and NMR analyses. From the extracts/infusions, 57 compounds were identified, including iridoids, phenylpropanoid glycosides, flavonoids, and caffeic acid derivatives, among others. The MeOH extracts and infusions showed strong inhibition towards α-glucosidase with IC in the range of 0.13-0.84 µg/mL for the phenolic-enriched infusion extract (PEI) and 0.47-0.50 µg/mL for the MeOH extracts, respectively. The PEI showed higher inhibition towards α-glucosidase, and the MeOH extract of was better than the PEI. At 100 µg/mL, the PEI from the four herbal teas reduces the activity of α-amylase by 23.03-28.61%, with as the most active tea. Three of the species are high in phenylpropanoid glycosides, while contains rosmarinic acid. Some 26 compounds were identified in the infusion from , 28 from , and 21 from . Four of them are common in all the teas, namely decaffeoylverbascoside, verbascoside, isoverbascoside, and tuberonic acid hexoside. Ten compounds occur in two of the teas and seventeen, fifteen, and eleven compounds were detected only in , , and , respectively. Most of the compounds are reported for the first time from the crude drug infusions. The results give some support for the traditional use of herbal teas as digestives and/or indications for diabetes. The chemical fingerprints set the basis for quality control of the crude drugs, based on the main constituents and differential compounds occurring in the samples.
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However, the chemical composition of the infusions and their effect on enzymes related to metabolic syndrome is poorly known. The composition of infusions and methanol extracts of (Scrophulariaceae), , , and (Verbenaceae) was assessed and the effect of the infusions and extract was determined towards α-glucosidase, α-amylase, and pancreatic lipase. The commercial herbal products were extracted separately with MeOH or hot water to obtain the extract/infusion for comparative studies. Total phenolic, total flavonoid and antioxidant capacity were assessed. The fingerprints of the MeOH extracts and infusions were compared by HPLD-DAD. The extract constituents were tentatively identified by HPLC-MS/MS and NMR analyses. From the extracts/infusions, 57 compounds were identified, including iridoids, phenylpropanoid glycosides, flavonoids, and caffeic acid derivatives, among others. The MeOH extracts and infusions showed strong inhibition towards α-glucosidase with IC in the range of 0.13-0.84 µg/mL for the phenolic-enriched infusion extract (PEI) and 0.47-0.50 µg/mL for the MeOH extracts, respectively. The PEI showed higher inhibition towards α-glucosidase, and the MeOH extract of was better than the PEI. At 100 µg/mL, the PEI from the four herbal teas reduces the activity of α-amylase by 23.03-28.61%, with as the most active tea. Three of the species are high in phenylpropanoid glycosides, while contains rosmarinic acid. Some 26 compounds were identified in the infusion from , 28 from , and 21 from . Four of them are common in all the teas, namely decaffeoylverbascoside, verbascoside, isoverbascoside, and tuberonic acid hexoside. Ten compounds occur in two of the teas and seventeen, fifteen, and eleven compounds were detected only in , , and , respectively. Most of the compounds are reported for the first time from the crude drug infusions. 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subjects Antioxidants
Blood glucose
Buddleja saligna
Caffeic acid
Cocoa
Diabetes
Diabetes mellitus
Enzymes
Flavonoids
Flowers & plants
glucosidase inhibition
Glycosides
Herbal medicine
HPLC-MS/MS studies
Hyperglycemia
Lippia javanica
Metabolic syndrome
Metabolites
Phenolic compounds
phenylpropanoid glycosides
Quality control
Rosmarinic acid
Scrophulariaceae
Software
South African herbal teas
Tea
Verbenaceae
α-Amylase
α-Glucosidase
title Chemical Profiling, Enzyme Inhibitory Activity and Antioxidant Capacity of South African Herbal Teas: Buddleja saligna , Lippia javanica , L. scaberrima and Phyla dulcis
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