The science of matcha: Bioactive compounds, analytical techniques and biological properties

Green Tea Polyphenol (-)-Epigallocatechin-3-Gallate (EGCG): A Time for a New Player in the Treatment of Respiratory Diseases?

“…The chemical composition of green tea depends on many factors, including climate, season, horticultural practices, processing, and type and age of the plant [ 42 , 43 ]. Green tea contains polyphenols, i.e., flavanols, flavandiols, flavonoids, and phenolic acids, which account for 30% of the dry weight of green tea leaves.…”

Paper-based colorimetric sensor array for the rapid and on-site discrimination of green tea samples based on the flavonoid composition

“…This can be explained by the high concentration of avan-3-ol present in green tea extracts: catechin (C), gallocatechin (GC), gallocatechin gallate (GCG), epicatechin (EC), epicatechin gallate (ECG), epigallocatechin gallate (EGCG), and epigallocatechin (EGC). 12,13 However, the concentration of each avan-3-ol may vary according to the origin of the green tea and the method of production of the extract. Therefore, resulting in color variation for the extract samples, which allows their classication.…”

“…Minor compounds are also observed, such as saponins, theobromine, L-theanine, and amino acids. 12,13 The quality, aroma, and taste of green tea products depend on their chemical composition and the relative amount of each class of compound can be inuenced by several reasons, ranging from the technique used in its manufacturing process to the environmental conditions of crops and the management of C. sinensis. 14 For instance, the treatment of C. sinensis for enzymatic deactivation by the steam processing method reduces the concentration of catechins resulting in a green tea with lower astringency, however, using the pan-ring method, the opposite is observed.…”

“…Minor compounds are also observed, such as saponins, theobromine, l -theanine, and amino acids. 12,13…”

Nutraceuticals and mitochondrial oxidative stress: bridging the gap in the management of bronchial asthma

“…Besides, plants that are rich in isoflavones, lycopene, and β-carotene possess antioxidative properties that can contribute to cancer-protective effect (Nasri et al 2014). In terms of chronic respiratory diseases, curcumin, berberine, naringenin, green tea, gallic acid, and caffeine are examples of nutraceuticals that can be utilized to counter overproduction of reactive oxygen species as observed in chronic obstructive pulmonary disease (COPD) and lung cancer, whereas resveratrol, grape seed oil, coenzyme Q10, and lipoic acid exert remarkable antiinflammatory activities that can be utilized to target various inflammatory pathways underlying the pathogenesis of asthma (Devkota et al 2021a;Hardwick et al 2021;Helal et al 2019;Paudel et al 2022b;Wadhwa et al 2021). Similarly, medicinal plant such as Alpinia galanga (Ramanunny et al 2022) and genus Blepharis (Dirar et al 2021) possess significant anti-oxidant and anti-inflammatory activity that favors asthma management.…”