Intermolecular hydrogen bonds between catechin and theanine in tea: slow release of the antioxidant capacity by a synergetic effect

Xia, Yirong; Ni, Wei; Wang, Xintong; Wang, Yanyan; Huang, Ximing

doi:10.1039/d2ra03692d

Cited by 2 publications

(2 citation statements)

References 40 publications

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“…Many studies on the prevention and alleviation of obesity have been reported, some of which have focused on green tea ingredients. Tea catechin, a type of polyphenol contained in green tea, exerts an antioxidant effect [ 23 , 24 ]. Active oxygen causes aging of the human body, age spots, wrinkles, and lifestyle-related diseases, such as arteriosclerosis.…”

Section: Introductionmentioning

confidence: 99%

Anti-Obesity and Anti-Inflammatory Synergistic Effects of Green Tea Catechins and Citrus β-Cryptoxanthin Ingestion in Obese Mice

Nakadate

Kawakami

Yamazaki

2023

IJMS

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Chronic obesity causes various diseases, leading to an urgent need for its treatment and prevention. Using monosodium-glutamate-induced obesity mice, the present study investigated the synergistic obesity-reducing effects of tea catechins and the antioxidant β-cryptoxanthin present in mandarin oranges. The results show that the obese mice that ingested both tea catechin and β-cryptoxanthin for 4 weeks had a significantly decreased body weight, with no difference in body weight compared with control mice. Moreover, the blood biochemical test results were normal, and the body fat percentage was significantly decreased according to the histopathological analysis. Additionally, the abundance of M1 macrophages, which release pro-inflammatories, was significantly reduced in adipose tissue. Indeed, a significant decrease was detected in M1-macrophage-secreted tumor necrosis factor-alpha levels. Meanwhile, M2 macrophage levels were recovered, and adiponectin, which is released from adipocytes and involved in suppressing metabolic syndrome, was increased. Collectively, these results suggest that the combination of tea catechins and antioxidant foods can alleviate chronic obesity, indicating that a combination of various ingredients in foods might contribute to reducing chronic obesity.

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Section: Introductionmentioning

confidence: 99%

Anti-Obesity and Anti-Inflammatory Synergistic Effects of Green Tea Catechins and Citrus β-Cryptoxanthin Ingestion in Obese Mice

Nakadate

Kawakami

Yamazaki

2023

IJMS

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“…It is known that L-theanine and caffeine bind with tea polyphenols and form complexes (Guo et al, 2021;Xia et al, 2022;Wang et al, 2023). The increase in L-theanine and caffeine levels during storage, as well as the increase in DPPH activity in spray-dried and freeze-dried tea samples, can be explained by the gradual release of these compounds from various complexes formed among them.…”

Section: Determination Of Moisture Content Of Powder Samples Prepared...mentioning

confidence: 99%

Freeze drying and spray drying for the retention of the active components, L‐theanine and caffeine, and antioxidant activity of tea‐based ingredients

Allameh,

Orsat

2024

Int J of Food Sci Tech

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SummaryPreserving food products from oxidation improves their quality and stability. This study compares the effects of storage on L‐theanine, caffeine, moisture content and antioxidant activity of spray‐dried and freeze‐dried white tea infusions. The antioxidant activities of both dried infusions were restored over a 60‐day storage. On Day 60, the L‐theanine and caffeine levels of the freeze‐dried samples were respectively 1.45 ± 0.03 mg mL−1 and 2.23 ± 0.04 mg mL−1 compared with 1.16 ± 0.03 mg mL−1 and 1.97 ± 0.01 mg mL−1 on Day 0. In the spray‐dried samples, the L‐theanine was 0.32 ± 0.01 mg mL−1 on Day 60 and 0.36 ± 0.02 mg mL−1 on Day 0, while caffeine remained unchanged. Regarding undried/control samples, L‐theanine and caffeine declined from respectively 0.29 ± 0.0004 mg mL−1 and 0.33 ± 0.01 mg mL−1 on Day 0 to 0.2 ± 0.001 mg mL−1 and 0.26 ± 0.02 mg mL−1 on Day 60, associated with a decrease in DPPH activity from 75.87% (Day 0) to 15.34% (Day 60). Freeze‐drying and spray‐drying tea infusions yielded functional products with stable antioxidant activity and moisture. Both drying techniques are reliable for preserving tea preparations.

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Intermolecular hydrogen bonds between catechin and theanine in tea: slow release of the antioxidant capacity by a synergetic effect

Abstract: The health benefits of drinking tea stem from it being rich in polyphenols and other physiologically-active substances.

Cited by 2 publications

References 40 publications

Anti-Obesity and Anti-Inflammatory Synergistic Effects of Green Tea Catechins and Citrus β-Cryptoxanthin Ingestion in Obese Mice

Anti-Obesity and Anti-Inflammatory Synergistic Effects of Green Tea Catechins and Citrus β-Cryptoxanthin Ingestion in Obese Mice

Freeze drying and spray drying for the retention of the active components, L‐theanine and caffeine, and antioxidant activity of tea‐based ingredients

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