Effect of Drying Techniques on Phytochemical Contents and Biological Activities on Bamboo Leaves as Potential Herbal Tea

Mohammad Amil Zulhilmi Benjamin and Fiffy Hanisdah Saikim and Shean Yeaw Ng and Nor Azizun Rusdi (2022) Effect of Drying Techniques on Phytochemical Contents and Biological Activities on Bamboo Leaves as Potential Herbal Tea. In: INTERNATIONAL CONFERENCE ON FOOD SCIENCE AND NUTRITION 2022 ” Future Food: Emerging Trends, Health and Diversity, 24th-25th August 2022., Online.

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Presently, bamboos have gained global attention for their therapeutic potential. However, it is rarely considered for its biological activities due to the limitations of studies, especially in Sabah, Malaysia. Thus, searching for the phytochemical content and biological activities among bamboo leaves has increased demand in certain Asian countries. Six species of bamboos, namely Bambusa vulgaris, B. multiplex, B. tuldoides, Dinochloa sublaevigata, Gigantochloa levis, and Schizostachyum brachycladum, were studied with five drying methods: sun drying, shade drying, microwave drying, oven drying, and freeze-drying. The infused leaves of bamboo extracts were analyzed for their total phenolic (TPC) and flavonoid (TFC) contents. The antioxidant activities were determined using two assays; the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and the ferric reducing antioxidant power (FRAP) assays. Toxicity tests of potential bamboo extracts were investigated using the brine shrimp lethality bioassay (BSLB). Bioactive compounds of potential bamboo extracts were determined using liquid chromatography-tandem mass spectrometry (LC-MS). The freeze-drying method exhibited the highest yield for the phytochemical contents and antioxidant activities, excluding B. vulgaris, which is preferable to microwave drying. TPC and TFC results showed a range of 2.69 ± 0.01 – 12.59 ± 0.09 mg GAE/g and 0.77 ± 0.01 – 2.12 ± 0.01 mg QE/g, respectively. The IC50 of DPPH ranged from 2.92 ± 0.01 to 4.73 ± 0.02 μg/mL, showing high radical scavenging activity. FRAP values also significantly differed, ranging from 6.40 ± 0.12 to 36.65 ± 0.09 mg TE/g. Toxicity studies of potential bamboo extracts displayed no toxicity activity against the BSLB based on LC50 analysis. This data may help in utilizing the bamboo leaves as functional food applications to be developed into bamboo tea.

Item Type: Conference or Workshop Item (Paper)
Keyword: Antioxidant activities , Brine shrimp lethality bioassay , Drying methods , LC-MS , Phytochemical contents
Subjects: Q Science > QK Botany > QK1-989 Botany > QK710-899 Plant physiology
S Agriculture > SB Plant culture > SB1-1110 Plant culture > SB183-317 Field crops Including cereals, forage crops, grasses, legumes, root crops, sugar plants, textile plants, alkaloidal plants, medicinal plants
Department: FACULTY > Faculty of Food Science and Nutrition
Date Deposited: 04 Apr 2023 15:35
Last Modified: 22 May 2023 10:51
URI: https://eprints.ums.edu.my/id/eprint/35259

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