Comparative Analysis of Biochemical Compositions and Quality Attributes of Green Tea and Black Tea from Prominent Bangladeshi Brands

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Islam Md. Ashraful; Kabir Fahriha Nur A.; Khatun Anwara Akter; Sathi Tasnim Rahaman; Afrin Adrita; Palleb Md Shohel Rana; Nayan Sourav Biswas; Islam Nazmul; Halim Md. Abdul

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Journal Paper

Paper Information

Journal: JOURNAL OF FOOD SCIENCE AND TECHNOLOGY Year:2025 | Volume:22 | Issue:160 Page(s): 242-257

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Title

Comparative Analysis of Biochemical Compositions and Quality Attributes of Green Tea and Black Tea from Prominent Bangladeshi Brands

Author(s)

Keywords

Green Tea

Black Tea

Polyphenol

Antioxidant

Biochemical

Health benefit

Abstract

Tea is the most widely consumed non-alcoholic beverage in the world, valued for its economic significance and health benefits, largely attributed to its polyphenolic compounds with potent antioxidant properties. This research aims to assess the chemical composition and quality of green and black tea products available in the Bangladeshi market. Samples were collected from five leading brands of each type: black tea brands included Ispahani, Kazi & Kazi, Jafflong, Halda Valley, and Seylon, while green tea brands comprised Ispahani, Kazi & Kazi, Jafflong, Halda Valley, and Lipton. The analysis focused on proximate compositions, total phenols, flavonoids, DPPH radical scavenging activity, caffeine levels, theaflavins (TF), thearubigins (TR), high polymerized substances (HPS), and total liquor color (TLC). A comparative analysis of green and black tea reveals significant differences in their chemical compositions and potential health benefits. Green tea boasts a higher phenolic content, ranging from 72.94 to 75.68 mg GAE/g, and exhibits greater antioxidant activity, with DPPH (2,2-diphenyl-1-picrylhydrazyl) values between 91.29 to 96.55 ml Trolox/g, compared to black tea, which has phenolic content of 66.21 to 67.32 mg GAE/g and DPPH values of 79.84 to 87.73 ml Trolox/g. Conversely, black tea contains higher levels of caffeine (31.95 to 37.36 ppm), flavonoids (63.70 to 67.78 mg QE/g), and tannins (14.02 to 17.36 mg TAE/g) than green tea, which has caffeine levels of 25.18 to 28.41 ppm, flavonoid content of 27.17 to 37.80 mg QE/g, and tannin content of 5.87 to 7.21 mg TAE/g. The analysis indicates that black tea has higher concentrations of theaflavins, thearubigins, highly polymerized substances, and total liquor color compared to green tea, contributing to its distinctive flavor and appearance.

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