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Recycling of filter tea industry by-products: production of A. millefolium extracts using subcritical water extraction

Medicinal plants are most commonly used in the form of herbal tea, individually or in a tea blend. In the process of production filter tea, "herbal dust" or very small particles are formed during grinding of the plant material. As the particles of herbal dust are smaller (<0.315 mm) with respect to the particle size of filter paper, this fraction cannot be used in form of filter tea and is considered as a by-product in the tea production process [1]. Considering the significant content of bioactive compounds in this type of material, it would be beneficial to develop an adequate way of additional exploitation of the by-product and its transformation into high-quality products. A medicinal plant with pharmacological properties that are recognized worldwide is Achillea millefolium which is included in the national Pharmacopoeias of many countries. Many scientific researches confirmed the biological activity of A. millefolium preparations such as anti-inflammatory, antitumor, antioxidant, antimicrobial, liver protective activities, and gastroprotective activity.

herbal tea ; by-products, extraction, Achillea millefolium

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