将F藻(Lessonia trabeculata)的茎部浸泡后粉碎至1~3 mm进行消化反应，考察了Na2CO3浓度、料液质量比、搅拌转速、消化温度和消化时间对褐藻胶消化得率和褐藻胶溶液粘度的影响，通过正交实验对消化工艺条件进行优化，并对褐藻胶进行红外光谱定性分析. 结果表明，最佳消化条件为：温度70℃, Na2CO3浓度1.67%，搅拌转速400 r/min，料液质量比1:15，时间8 h. 该条件下褐藻酸钠产品得率为34.80%，粘度为2261.67 mPa×s，远高于市售产品的173.30 mPa×s. 褐藻酸钠基本理化指标均符合国家标准、粘均分子量为11.85 kDa.

The technological parameters for digestion process of L. trabeculata were studied with stem of wet L. trabeculata in the particle size range of 1~3 mm. The effects of Na2CO3 concentration, rotational speed, mass ratio of solid to liquid, digestion temperature and digestion time on the digestion yield and viscosity of alginate solution were examined. Based on the results of single factor experiments, the orthogonal experiments were carried out to optimize the technological parameters. The t=results showed that the optimum conditions were Na2CO3 concentration 1.67%, rotational speed 400 r/min, mass ratio of solid to liquid 1:15, digestion temperature 70℃ and digestion time 8 h. Under these conditions, the product yield of sodium alginate from L. trabeculata reached 34.80% and its viscosity was 2261.67 mPa×s, which was higher than that of commercial product (173.30 mPa×s). The relative molecular weight of prepared sodium alginate reached 11.85 kDa, and its physicochemical properties met national standard.