Chlorophylls Recovery from Tea Dregs of Commercial Green Teas and Its Potency as Sensitizer for Photodynamic Inactivation of

Indrawati, RENNY and Yusuf, MELISA MEGAWATI and Brotosudarmo, TATAS HARDO PANINTINGJATI and Zubaidah, ELOK and Sutrisno, AJI and Limantara, LEENAWATY (2019) Chlorophylls Recovery from Tea Dregs of Commercial Green Teas and Its Potency as Sensitizer for Photodynamic Inactivation of. Full Paper Template. pp. 1-11.

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Abstract

Many studies have been addressed into polyphenolic fractions of green tea, its existence in the fresh tea leaves, in processed leaves, even to in its waste after brewing. Only few investigations are dealt with the chlorophylls content of tea leaves. In fact, the transformation of chlorophylls takes part in the development of flavor and color of green tea. Since the chlorophylls have poor solubility in water; it was supposed that most pigments are remained in the tea dregs after brewing. The present study was aimed to evaluate the possibility of chlorophylls recovery after hot water extraction of commercial green teas and afterwards the potency of its use for photodynamic inactivation of pathogenic bacteria, Listeria monocytogenes. HPLC and spectroscopic analyses were performed to predict the type and ratio of chlorophyll derivatives which present in the tea dregs. We found that the most dominant fraction was pheophytin a (~50%), followed with its epimers as well as pheophorbide a. In addition, the crude pigment extract from tea dregs was able to inactivate up to eighty percent of L. monocytogenes cells after photodynamic reaction under illumination of red or blue LED lamp. These results revealed a new sight for the utilization of tea dregs in the eradication of pathogenic bacteria.

Item Type:	Artikel
Uncontrolled Keywords:	Chlorophylls; Green tea; Photodynamic inactivation; Tea dregs
Subjects:	A General Works > AC Collections. Series. Collected works
Divisions:	Universitas Pembangunan Jaya
Depositing User:	Alexandro Andika
Date Deposited:	04 Jul 2023 04:26
Last Modified:	04 Jul 2023 04:26
URI:	http://eprints.upj.ac.id/id/eprint/5514

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