Abstract In this study, the method of subcritical fluid-propane extraction (SPE) used to coproduce egg yolk oil (EYO) and low-fat egg yolk powder from spray-dried egg yolk powder (EYP) was investigated. Results showed that the optimum parameters were: extraction temperature of 313.15 K, extraction time of 120 min, and solid-liquid ratio of 1:9 (g/mL). Under this condition, the residual oil rate of EYP was 21.04%, which was much lower than that of ethanol extraction (39.24%). Scanning electron microscopy reveled that serious disruptions of egg yolk sphere extracted by SPE were observed, facilitating the EYO extraction. In addition, oil extracted by SPE had lower acid value and peroxide value than that of ethanol extraction. Moreover, the emulsifying properties and solubility of low-fat EYP obtained by SPE were similar to the original egg yolk powder. This study provides a new technique for coproducing high-quality oil and protein.

中文翻译：

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蛋黄的亚临界流体萃取处理：产品表征

摘要 本研究研究了亚临界流体-丙烷萃取(SPE) 用于从喷雾干燥蛋黄粉(EYP) 中联产蛋黄油(EYO) 和低脂蛋黄粉的方法。结果表明，最佳参数为：提取温度313.15 K，提取时间120 min，固液比1:9（g/mL）。在此条件下，EYP的残油率为21.04%，远低于乙醇提取的残油率（39.24%）。扫描电子显微镜发现 SPE 提取的蛋黄球严重破裂，促进了 EYO 的提取。此外，与乙醇提取相比，SPE提取的油具有较低的酸值和过氧化值。而且，SPE得到的低脂EYP的乳化性能和溶解性与原蛋黄粉相似。该研究为联产优质油脂和蛋白质提供了一种新技术。