The optimum recipe of yolk powder and sodium nitrite was determined by single factor trial and preference method.
通过单因素试验和优选试验法，得出蛋黄粉和亚硝酸钠的最佳配比。
METHODS Indicated by the content of sennoside A, the conditions of residue solvent extraction and resin purification were determined by single factor trial.
方法番泻苷A为指标，以单因素考察确定药渣溶剂提取与树脂精制条件。
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