Development of skin serum products from tangor extract (Citrus nobilis Lour)
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Abstract
Tangor (Citrus nobilis Lour), locally known as “Som Kaew,” is a Geographical Indication (GI) plant of Samut Songkhram
Province, characterized by a thicker peel than common oranges. Currently, facial skin care products, particularly in
the form of serums, are highly popular. Objective: To develop a serum from Tangor peel extract and evaluate its
effectiveness in moisturizing the skin. Methods: Key substances were extracted from Tangor peels using ethanol for 7 days and concentrated via a rotary evaporator. The antioxidant activity of the extract was assessed using the DPPH method. The extract was formulated into three serum recipes. Stability was tested through 7 heating-cooling cycles at 5°C and 45°C. Safety was evaluated using a skin patch test, and skin moisturizing efficacy was measured using a Corneometer before and after 28 days of use. Statistical analysis included percentage, mean, standard deviation, and paired-sample t-test. Results: The Tangor peel extract exhibited antioxidant activity with an EC50 value of 0.17 mg/mL, compared to 0.01 mg/mL for the BHT standard. Stability tests revealed that Serum Formula 3 remained a clear yellow liquid with no significant change in pH and no phase separation. After 28 days of using Serum Formula 3, the average skin moisture level was 46.702 ± 12.003 (p < 0.05). Conclusion: The serum containing Tangor peel extract (Formula 3) demonstrated physical and chemical stability and provided the highest moisturizing effect. It has the potential to be developed into effective skin care products.
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References
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