储藏温度对蒸谷米糊化特性的影响

    Effect of storage temperature on the gelatinization characteristics of parboiled rice

    • 摘要: 为了研究储藏温度对蒸谷米糊化特性的影响并探究其储藏特性,以同批次稻谷生产的大米为参照,模拟低温(15℃)、常温(25℃)和高温(35℃),湿度为75%的储藏环境条件,储藏期为300 d,每30 d取样1次,采用快速黏度仪法对不同储藏温度下蒸谷米和大米样品的糊化特性指标(峰值黏度、最低黏度、最终黏度、衰减值、回生值、峰值时间和糊化温度)进行测定,并对数据进行相关性分析和因素方差分析。结果表明:大米的峰值黏度、衰减值随着储藏时间的延长先升高后降低,最低黏度、最终黏度、回生值、糊化温度随着储藏时间的延长逐渐升高,峰值时间呈现波动小幅升高趋势。而同批次稻谷生产的蒸谷米峰值黏度、最低黏度、最终黏度、衰减值和回生值均比大米低,峰值时间和糊化温度比大米高,随着储藏时间的延长,蒸谷米的峰值黏度、最低黏度、最终黏度和回生值呈先升高后降低的趋势,温度越高变化幅度越大,蒸谷米的衰减值、峰值时间、糊化温度基本稳定;储藏温度除对大米的糊化温度有显著影响外,对蒸谷米和大米的其他糊化特性指标均有极显著影响(P< 0.01);储藏时间与储藏温度的交互作用对大米的糊化特性指标均有极显著影响(P< 0.01),但对蒸谷米的糊化温度无显著影响(P> 0.05),且对峰值时间有显著影响(P< 0.05)。储藏时间除与大米的峰值黏度无显著相关、与峰值时间有显著相关外,与其他糊化特性指标均极显著相关,且相关系数绝对值在0.471及以上;而储藏时间与蒸谷米的衰减值、峰值时间显著相关,与糊化温度极显著相关,相关系数绝对值在0.386及以上。储藏期内,与大米相比,蒸谷米的各糊化特性指标受储藏时间影响相对较小,表明蒸谷米能更好地保持淀粉结构和糊化特性,具有良好的储藏稳定性。

       

      Abstract: In order to study the effect of storage temperature on the gelatinization characteristics of parboiled rice and explore its storage characteristics, low temperature (15℃, RH 75%), normal temperature (25℃, RH 75%) and high temperature (35℃, RH 75%) were simulated as the storage conditions of milled rice. The storage period was 300 days, and samples were taken every 30 days. The gelatinization characteristics parameters (peak viscosity, trough viscosity, final viscosity, breakdown, setback, peak time, and gelatinization temperature) of parboiled rice and milled rice samples were measured by RVA, and correlation analysis and factor analysis of variance were carried out for the data. The results showed that the peak viscosity and breakdown of milled rice increased first and then decreased with the extension of storage time, while the trough viscosity, final viscosity, setback and gelatinization temperature increased gradually with the extension of storage time, and the peak time showed a small increase trend. The peak viscosity, trough viscosity, final viscosity, breakdown and setback of parboiled rice produced in the same batch of milled rice were lower than that of milled rice, and the peak time and gelatinization temperature were higher than that of milled rice. With the extension of storage time, the peak viscosity, trough viscosity, final viscosity and setback of parboiled rice increased first and then decreased. The higher the temperature, the greater the change range, and the breakdown, peak time and gelatinization temperature of parboiled rice were basically stable; Storage temperature had a significant impact on the gelatinization characteristics of parboiled rice and milled rice (P< 0.01); The intersection of storage time and storage temperature had a very significant effect on the gelatinization characteristics of milled rice (P< 0.01), but had no significant effect on the gelatinization temperature (P> 0.05) and had a significant impact on the peak time (P< 0.05) of parboiled rice. Storage time had significant correlation with other gelatinization characteristics indexes except peak viscosity and peak time of milled rice, and the absolute value of correlation coefficient was above 0.471. However, storage time had significant correlation with breakdown and peak time of parboiled rice, and had extremely significant correlation with gelatinization temperature, with the absolute value of correlation coefficient above 0.386.During the storage period, compared with the milled rice, the gelatinization characteristics indexes of parboiled rice were relatively less affected by the storage time, indicating that parboiled rice can better maintain its starch structure and gelatinization characteristics, and has good storage stability.

       

    /

    返回文章
    返回