Review: Telaah Kandungan Senyawa Katekin dan Epigalokatekin Galat (EGCG) sebagai Antioksidan pada Berbagai Jenis Teh

Fadhilah, Zahra; Perdana, Farid; Syamsudin, Raden Aldizal Mahendra Rizkio

doi:10.20527/jps.v8i1.9122

Cited by 9 publications

(11 citation statements)

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“…According to research by Anggraini et al [41], gambier catechins contain many polyphenolic compounds belonging to the flavonoid group, which act as good antioxidant compounds. Catechins can donate hydrogen atoms or their single electrons to radical compounds, which causes oxidation-reduction reactions to occur, so that radical compounds that initially had unpaired electrons now have their electrons paired and thus become non-radical [42].…”

Section: Discussionmentioning

confidence: 99%

Development of Indicator Film Based on Cassava Starch–Chitosan Incorporated with Red Dragon Fruit Peel Anthocyanins–Gambier Catechins to Detect Banana Ripeness

Santoso,

Pramitasari,

Anugrah

2023

Polymers

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Banana ripeness is generally determined based on physical attributes, such as skin color; however, it is considered subjective because it depends on individual factors and lighting conditions. In addition, improper handling can cause mechanical damage to the fruit. Intelligent packaging in the form of indicator film incorporated with anthocyanins from red dragon fruit peel has been applied for shrimp freshness detection; however, this film has low color stability during storage, necessitating the addition of gambier catechins as a co-pigment to increase anthocyanin stability. Nevertheless, the characteristics of films that contain gambier catechins and their applications to bananas have not been studied yet; therefore, this study aims to develop and characterize indicator films that were incorporated with red dragon fruit peel anthocyanins and gambier catechins to detect banana ripeness. In this study, the indicator films were made via solvent casting. The films were characterized for their structural, mechanical, and physicochemical properties, and then applied to banana packaging. The results show that the film incorporated with anthocyanins and catechins in a ratio of 1:40 (w/w) resulted in better color stability, mechanical properties, light and water vapor barrier ability, and antioxidant activity. The application of the indicator films to banana packaging resulted in a change in color on the third day of storage. It can be concluded that these films could potentially be used as an indicator to monitor banana ripeness.

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Section: Discussionmentioning

confidence: 99%

Development of Indicator Film Based on Cassava Starch–Chitosan Incorporated with Red Dragon Fruit Peel Anthocyanins–Gambier Catechins to Detect Banana Ripeness

Santoso,

Pramitasari,

Anugrah

2023

Polymers

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“…Inhibisi merupakan representasi melemahnya warna ungu dan dapat dihitung dari serapannya. (Fadhilah et al, 2021).…”

Section: Hal 80unclassified

Extraction of Polyphenols in Green Tea Shoots as Antioxidant Substance

Siskayanti,

Rizkiah,

Muliati

et al. 2024

Sainteks

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Green tea is a plant that has polyphenolic active compounds. Polyphenols are a group of compounds that act as natural antioxidants. Antioxidants are needed by the body to protect the body from free radical attacks. The polyphenol content in the tea leaves itself is influenced by the weather, variety, soil type, and the degree of maturity of the leaves when picked. Therefore, in this study green tea shoots were used because the polyphenol content and antioxidant activity of green tea in the shoots are known to be greater than the leaves on the stalks below. This study aims to determine the levels of polyphenols in green tea shoots using distilled water, 50% ethanol; 96% ethanol and determine the value of antioxidant activity obtained from the results of samples that have the highest levels of total polyphenols by maceration method for 24 hours. The results of maceration are then separated between the filtrate and the precipitate. Then the filtrate is concentrated to obtain a thick extract and removes the remaining solvent using a rotary evaporator that is set to a pressure of 1 bar and a temperature below the boiling point of the solvent. Furthermore, the viscous extract obtained was tested by the Follin-Ciocalteu method using UV-Vis spectrophotometry at a wavelength of 765 nm and gallic acid as a standard to determine the levels of polyphenolic compounds. The test results for the highest levels of polyphenols were tested for antioxidant activity using the DPPH method (2,2 Diphenyl -1-Pikrylhidrazyl) which causes a color change and then measured using a spectrophotometer at a wavelength of 512 nm. Antioxidant activity can be seen from the IC50 (inhibitory concentration) value or the concentration that can reduce 50% of free radicals because the lower the IC50 value, the greater the antioxidant activity. The results showed that the levels of polyphenols in green tea shoot extract were respectively 16.47%; 22.16%; 18.09% so that the highest levels of polyphenols were obtained in green tea leaf extract macerated using 50% ethanol solvent. The results of the antioxidant activity test on samples using 50% ethanol solvent obtained an IC50 value of 5.7 ppm and included in the very good category.

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“…Journal of Pharmaceutical and Sciences |Volume 6|No.3|JULI-SEP|2023|pp.1407-1415 Electronic ISSN : 2656-3088 Homepage: https://www.journal-jps.com pendekatan analisis yang cepat dan efisien dalam ekstraksi kualitatif maupun kuantitatif kafein, baik sebagai komponen tunggal maupun dalam campuran (Fadhilah et al, 2021).…”

Section: Kata Kunci: Ekstrak Daun Teh Hijau Daun Teh Putih Penetapan ...unclassified

Penetapan Kadar Kafein Ekstrak Daun Teh Hijau Dan Putih Camellia Sinensis (L.) Dengan Kromatografi Cair Kinerja Tinggi

Lestary,

Nasution,

Ridwanto

et al. 2023

JPS

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Teh merupakan salah satu minuman yang sangat populer dan sering dikonsumsi dalam rutinitas sehari-hari. Meskipun konsumsi kafein yang berlebihan dalam jangka panjang dapat berpotensi meningkatkan risiko terjadinya beberapa kondisi kesehatan seperti hipertensi, penyakit jantung, dan stroke, penggunaan kafein masih tetap diminati oleh banyak orang dalam masyarakat. Tujuan dari penelitian ini adalah untuk mengidentifikasi kandungan kafein dalam ekstrak daun teh hijau dan teh putih melalui penerapan metode kromatografi cair kinerja tinggi. Proses penelitian ini mencakup beberapa tahapan, yaitu pengolahan bahan tumbuhan, ekstraksi menggunakan pelarut etanol, analisis karakteristik, pemeriksaan fitokimia, serta pengukuran kadar kafein dalam ekstrak daun teh hijau dan teh putih menggunakan metode kromatografi cair kinerja tinggi. Ekstraksi dari daun teh hijau dan teh putih dilakukan melalui metode maserasi dengan menggunakan etanol 96%, dan ekstrak yang dihasilkan kemudian dipekatkan dengan rotary evaporator. Penentuan kadar kafein dilakukan menggunakan metode kromatografi cair kinerja tinggi. Melalui analisis skrining fitokimia terhadap ekstrak etanol dari daun teh hijau dan teh putih, ditemukan adanya beberapa kelompok senyawa kimia seperti alkaloid, flavonoid, saponin, tanin, dan steroid. Kandungan kafein dalam sampel ditentukan dengan menghitung luas area di bawah kurva (AUC) pada ekstrak teh hijau dan teh putih. Hasil penentuan kadar kafein pada ekstrak teh hijau menunjukkan nilai sekitar 98,4278069571 mg/g, sedangkan pada ekstrak teh putih tercatat sekitar 136,131488681 mg/g.

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Review: Telaah Kandungan Senyawa Katekin dan Epigalokatekin Galat (EGCG) sebagai Antioksidan pada Berbagai Jenis Teh

Cited by 9 publications

References 0 publications

Development of Indicator Film Based on Cassava Starch–Chitosan Incorporated with Red Dragon Fruit Peel Anthocyanins–Gambier Catechins to Detect Banana Ripeness

Development of Indicator Film Based on Cassava Starch–Chitosan Incorporated with Red Dragon Fruit Peel Anthocyanins–Gambier Catechins to Detect Banana Ripeness

Extraction of Polyphenols in Green Tea Shoots as Antioxidant Substance

Penetapan Kadar Kafein Ekstrak Daun Teh Hijau Dan Putih Camellia Sinensis (L.) Dengan Kromatografi Cair Kinerja Tinggi

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