Miao et al. (2013) reported that monoester and diester astaxanthin
comprised 75% and 15% of total astaxanthin, respectively in the
H. pluvialis cysts. This ratio of diester tomonoester (0.2) is reported to increase
in correlation with higher degradation of astaxanthin, due to the
higher stability of astaxanthin diesters (Miao et al., 2013). In the present study, the diester to monoester ratio was below 0.2 on week 0 and remained below 0.2 in the powder stored at −20 °C, 4 °C, and 20 °C from both packaging and drying methods, with one exception (spraydried normally packed powder at 20 °C on week 20). However, the astaxanthin degradation was more than 20% on many occasions under those storage conditions. Our results are therefore in disagreement with the inference of Miao et al. (2013)
Miao et al. (2013) reported that monoester and diester astaxanthincomprised 75% and 15% of total astaxanthin, respectively in theH. pluvialis cysts. This ratio of diester tomonoester (0.2) is reported to increasein correlation with higher degradation of astaxanthin, due to thehigher stability of astaxanthin diesters (Miao et al., 2013). In the present study, the diester to monoester ratio was below 0.2 on week 0 and remained below 0.2 in the powder stored at −20 °C, 4 °C, and 20 °C from both packaging and drying methods, with one exception (spraydried normally packed powder at 20 °C on week 20). However, the astaxanthin degradation was more than 20% on many occasions under those storage conditions. Our results are therefore in disagreement with the inference of Miao et al. (2013)
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