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Taiwan Agricultural Research Institute, Council of Agriculture, Executive Yuan--Publication-Journal of Taiwan Agricultural Research

Journal of Taiwan Agricultural Research

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Influence of Storage Conditions of Camellia brevistyla Seeds on the Quality of Pressed Oils

Hsieh, C. M., J. C. Yang, H. S. Lur, Y. C. Chuang, K. P. Hsu, and Y. L. Lee. 2018. Influence of storage conditions of Camellia brevistyla seeds on the quality of pressed oils. J. Taiwan Agric. Res. 67(3):292–300.

Influence of Storage Conditions of Camellia brevistyla Seeds on the Quality of Pressed Oils

Ching-Ming Hsieh1, Jeng-Chuann Yang2, Huu-Sheng Lur3, Yao-Chun Chuang4, Kuang-Ping Hsu5, and Ya-Lin Lee6,*

Abstract

    Camellia brevistyla is an indigenous Taiwanese camellia tree. After harvested, the seeds were dried immediately to a moisture content of 6.5% or 12%. Then, the seeds were stored at conditions of -20, 4, or 15℃ for 6 mo before pressed for oil. Following pressing, all the oils were sealed in glass bottles and preserved at 4℃ for 6 mo, and then subjected to analyses of acid value (AV), peroxide value (POV), phenolic content, reducing power, vitamin E content, and oxidative stability. Results indicated that all the oils were comparable to the freshly pressed ones, retaining good edible quality with the evaluation standards of AV < 1.0 and POV < 20 and the common food grade pressed oil standard. All these oil samples were continually kept at 4℃ for another 6 mo storage and then subjected to reanalyzing. During this period, occasionally opening of and withdrawing some oils from the bottles were conducted to imitate a common household habit. The results indicated that the oils from seeds with lower moisture content (6.5%) and stored at temperatures below 4℃ had a better quality. Besides, the oil from seeds stored at the lowest temperature -20℃ had the best oxidative stability, which still attained the first grade camellia tea oil quality as stipulated in the national standard (AV < 1.5, POV < 6). Its phenolic content and reducing power showed the least reduction from those at the moment when unsealing (6 mo ago).

Key words: Camellia brevistyla seed, Oilseed storage condition, Moisture content of seed, Storage temperature, Oil quality.


* Corresponding author, e-mail: ylleet@tari.gov.tw
1 Assistant Research Fellow, Silviculture Division, Taiwan Forestry Research Institute, Taipei, Taiwan, ROC.
2 Associate Research Fellow, Botanical Garden Division, Taiwan Forestry Research Institute, Taipei, Taiwan, ROC.
3 Professor, Department of Agronomy, National Taiwan University, Taipei, Taiwan, ROC.
4 Research Assistant Biotechnology Division, Taiwan Agricultural Research Institute, Taichung, Taiwan, ROC.
5 Contracted Assistant Research Fellow, Wood Cellulose Division, Taiwan Forestry Research Institute, Taipei, Taiwan, ROC.
6 Associate Research Fellow, Biotechnology Division, Taiwan Agricultural Research Institute, Taichung, Taiwan, ROC.

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