| 摘要: |
| 【目的】以山茱萸榨汁后的果渣为原料，研究制备不溶性膳食纤维（IDF）的最佳工艺。【方法】采用化学法提取工艺，通过预试验选择最佳工艺路线，并利用星点设计 响应曲面法优化工艺条件。以NaOH浓度、液料比、温度作为自变量，以产品质量、IDF含量和产品持水力三者所得综合指标（综合指标值=产品质量×0.1+IDF含量×0.01+持水力）作为因变量。对试验结果进行拟合，并对最佳工艺条件下制备的山茱萸果渣IDF的化学组成和部分特性进行分析。【结果】拟合方程结果显示，二次项回归方程优于线性方程和三次项方程，并以二次项回归方程建立了预测模型。用预测模型计算所得的制备山茱萸果渣IDF的最佳反应条件为：NaOH浓度0.421 4 mol/L、液料比19.643 mL/g、温度63.37 ℃，此条件下作用2 h，所得产品的综合指标预测值为19.337 0。在相近的试验条件下对预测结果进行验证，结果显示综合指标值为18.578 6，接近预测值。与原料相比，最佳工艺条件下制备的山茱萸果渣IDF的IDF含量及溶胀力、持水力、持油力均有很大提高，而蛋白质、脂肪含量明显降低。【结论】得到了制备山茱萸果渣IDF的最佳工艺条件，且所得产品的化学组成和特性明显优于原果渣。 |
| 关键词: 山茱萸果渣 不溶性膳食纤维 化学组成 星点设计 响应曲面法 |
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| 基金项目:山茱萸功能性系列健康食品深度开发研究项目 |
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| Preparation and functional properties of insoluble dietary fiber from Cornus officinalis residue |
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| Abstract: |
| 【Objective】Using residue of Cornus officinalis fruit as raw materials,research on optimization of preparation of insoluble dietary fiber (IDF) was carried out.【Method】In this study,IDF was prepared by alkali-insoluble fractions.Central composite design was applied to evaluate the effects of three independent variables (alkalinity,ratio of liquid to material and ambient temperature) on the aggregative indicator of IDF (the product weight,IDF content and swelling capacity).The fitting equations were formed using SAS 8.01.【Result】The binomial equation was better than linear equation and cubic polynomial equation concerning overall desirability.And it was used to produce 3-D response surface graphs,through which optimal formulation was predicted.The optimum conditions for production process were alkalinity (0.421 4 mol/L),ratio of liquid to material (19.643 mL/g) and ambient temperature (63.37 ℃) for two hours.Under these conditions,the equation predicted that the aggregative indicator was 19.337.In order to verify the data,another test was conducted in a similar condition and the aggregative indicator was 18.578 6,which was very close to the predicted one.【Conclusion】Results of these experiments indicated that the IDF production was significantly better than raw materials. |
| Key words: Cornus officinalis residue insoluble dietary fiber chemical properties central composite design response surface methodology |
