采用质构仪测定米粉条表面黏性的方法研究

    Study on determination of the surface viscosity of rice noodles by texture analyzer

    • 摘要: 在实际生产和烹饪过程中,米粉条因其表面黏性过大常出现“并条现象”,对其商品价值和烹饪食用价值造成不利影响,目前,常用感官评价方法对米粉条之间的粘连程度进行评价,但由于主观性较强,造成结果准确度不高。以江西干米粉条为原料,烹煮后利用质构仪对其表面黏性进行测定,研究不同的烹煮方式、煮后静置时间和质构测定条件(包括压缩力、测试速度和测后速度)对米粉条表面黏性的影响,在此基础上,进行重复性试验,通过比较测定结果的变异系数并对结果进行显著性分析,选出重现性好、灵敏度高的米粉条表面黏性测定条件,建立了基于质构仪测定米粉条表面黏性的方法,以期为米粉条的品质评价提供数据支持。结果表明:烹煮方式、煮后静置时间、压缩力和测后速度均对米粉条的表面黏性影响显著(P<0.05),而测试速度对其影响不显著。基于质构仪测定米粉条表面黏性适宜的条件:米粉条在沸水中煮至最佳蒸煮时间后捞出,静置5 min后进行质构黏性测试,压缩力600 g,测试速度0.5 mm/s,测后速度10 mm/s。在优选的测定条件下,其他8种米粉条黏性测定结果的变异系数均小于10%,精密度较高,重现性较好,且不同品种米粉条的表面黏性之间存在显著性差异(P<0.05)。

       

      Abstract: In the actual production and cooking process of rice noodles, sticking phenomenon of rice noodles often occurs due to the large surface viscosity, which adversely affects the commodity value and cooking quality of rice noodle product. Sensory evaluation is currently used to evaluate the degree of adhesion of rice noodles. Nevertheless, the accuracy of evaluation results was not high due to the strong subjectivity. In this paper, dried Jiangxi rice noodles from the market were used as raw materials. Surface viscosity of cooked rice noodles was measured with a texture analyzer. Variables such as cooking methods, resting time and measurement conditions (compressing force, test speed and post-test speed) were estimated, taking surface viscosity as indicator. Based on the results, repeatability test was performed. By comparing the coefficient of variation and analyzing the significance of the results, measurement conditions with good repeatability and high sensitivity were selected to establish a method for determining the surface viscosity of rice noodles based on the texture analyzer in order to provide data support for the quality evaluation of rice noodles. Results showed that cooking methods, resting time, compressing force and the post-test speed had significant effects on the surface viscosity of cooked rice noodles (P< 0.05), while insignificant effect was noticed for test speed. The suitable measurement conditions were: rice noodles were boiled for optimal cooking time followed by resting for 5 min before viscosity test. Compressing force was 600 g, test speed was 0.5 mm/s and the post-test speed was 10 mm/s. Under the optimum measurement conditions, all the coefficients of variations of the surface viscosities of other 8 rice noodles were less than 10%, indicating high precision and reproducibility, and differences in the surface viscosity among different rice noodles were significant (P< 0.05).

       

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