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气相色谱法测定结果表明：桔皮提取物中有一绝对优势组分。通过红外光谱和核磁共振进一步协同确定，与聚苯乙烯具有良好相溶性的组分是(d)-柠烯，即d-limonene。
Gas chromatography results show that: orange peel extract has an absolute advantage component. Further confirmed by infrared spectroscopy and nuclear magnetic resonance, the component with good compatibility with polystyrene is d-limonene, d-limonene.