Abstract
The present study aimed to investigate the fatty acid content, and antioxidant and moisturizing effect of Camellia assamica seed oil (CA). Additionally, microemulsions containing CA were also developed for topical use. The antioxidant activity of CA and two commercial Camellia oleifera seed oils were investigated by means of 1,1-diphenyl-2-picrylhydrazy radical (DPPH) assay and lipid peroxidation by ferric thiocyanate method. Moreover, the in vitro skin moisturizing effect was investigated on stillborn piglet skin by using a Corneometer®. CA microemulsions were developed and characterized by photon correlation spectroscopy, rheometer, and heating-cooling stability tests. The results revealed that the major fatty acid components of CA were cis-9-oleic acid, cis-9,12-linoleic acid, and palmitic acid. CA had a significantly higher lipid peroxidation inhibition and DPPH scavenging capacity compared to the commercial oils (p < 0.05). Lipid peroxidation inhibition of CA was 39.2% ± 0.6% at 37.5 mg/mL and the IC50 value of DPPH assay was 70.8 ± 27.1 mg/mL. The skin moisture content after applying CA, commercial oils, and tocopheryl acetate were significantly higher than untreated skin (p < 0.05) and the moisturizing efficacy increased with time. Interestingly, radical scavenging and antioxidant effect of CA microemulsions were significantly higher than the native oil even after the stability test (p < 0.05). In conclusion, incorporating CA into microemulsion increased its antioxidant activity indicating that it would be beneficial as a cosmeceutical application for anti-aging.
Highlights
Tea originated in East and South Asia
The present study focused on tea seed oil extracted from C. assamica cultivated in the high-attitude area in the Northern part of Thailand
The results in this study were in an accordance with the literature which noted that tea seed oil contained high amount of oleic acid, medium amount of linoleic acid, and low amount of linolenic acid [5]
Summary
Tea originated in East and South Asia. China was the first country to use tea as a beverage by infusing the dried leaves into hot water [1]. Tea has been widely used as a medicinal plant and popularly used in various traditional medicines such as Ayurveda, Unani, and Homoeopathy. Tea beverages are widely distributed throughout the world and are the most consumed after water. Is the leaf part of tea utilized, but the seed can be used to produce. Tea seed oil is an edible oil widely consumed in China. It is estimated that more than 2.5 million tons of tea seed oil will be produced by the year 2020 [2]
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