Study on Rice Quality Evaluation Based on Multivariate Statistics
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摘要: 目的:明确影响米饭品质的关键性理化指标,探索感官评价和理化试验之间的关系,建立一种简单易行的大米食用品质评价方法。方法:以三种代表性大米为原料,在三种蒸煮工艺下得到9组米饭,通过聚类与相关性分析,筛选出影响米饭食用品质的关键指标,再经主成分分析,得到综合得分公式。结果:影响米饭食用品质的指标为:水分、脂肪、硬度、粘着性、弹性、回复性,综合得分公式为:Z=0.42×水分+0.0532×脂肪−0.0597×硬度−0.447×粘着性+0.266×弹性+0.114×回复性。验证实验显示康弘1号的最佳蒸煮方法为IH常压蒸煮,稻花香、吉林小町米最佳蒸煮方法为直热式常压蒸煮。结论:各样品的主成分综合得分排名与感官评分排名基本一致,有较高匹配度,能够较好地预测米饭的食用品质。Abstract: Objective: To clarify the key physical and chemical indexes affecting the quality of rice, explore the relationship between sensory evaluation and physical and chemical test, and establish a simple and easy evaluation method of rice edible quality. Methods: Nine groups of rice were obtained from three representative rice under three cooking processes. Through cluster and correlation analysis, the key indexes affecting the edible quality of rice were selected, and then the comprehensive score formula was obtained by principal component analysis. Results: The indexes affecting the edible quality of rice were water, fat, hardness, adhesion, elasticity and recoverability. The comprehensive score formula was Z=0.42×water+0.0532×fat−0.0597×hardness−0.447×adhesion+0.266×elasticity+0.114×recoverability. The validation experiment showed that the best cooking method of Kanghong 1 was IH atmospheric cooking, and the best cooking method of Daohuaxiang and Jilin Xiaoting rice was direct heating atmospheric cooking. Conclusion: The principal component comprehensive score ranking of each sample was basically consistent with the sensory score ranking, would have a high matching degree, and could better predict the edible quality of rice.
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Key words:
- rice /
- quality /
- multivariate statistics /
- evaluation method
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表 1 米饭感官评定标准
Table 1. Sensory appraisal standards of rice
一级指标分值 二级指标分值 具体特征描述:分值 气味
(20分)纯正性、浓郁性20分 具有米饭特有的香气,
香气浓郁:18~20分具有米饭特有的香气,
米饭清香:15~17分具有米饭特有的香气,
香气不明显:12~14分米饭无香味,但无异味:7~12分 米饭有异味:0~6分
外观结构
(20分)颜色7分 米饭颜色洁白:6~7分 颜色正常:4~5分 米饭发黄或发灰:0~3分 光泽8分 有明显光泽:7~8分 稍有光泽:5分~6分 无光泽:0~4分 饭粒完整性5分 米饭结构紧密,饭粒完整性好:
4~5分米饭大部分结构紧密完整:3分 米饭粒出现爆花:0~2分 适口性
(30分)粘性10分 滑爽,有粘性,不粘牙:8~10分 有粘性,基本不粘牙:6~7分 有粘性,粘牙;或无粘性:0~5分 弹性10分 米饭有嚼劲:8~10分 米饭稍有嚼劲:6~7分 米饭疏松、发硬,感觉有渣:0~5分 软硬度10分 软硬适中:8~10分 感觉略硬或略软:6~7分 感觉很硬或很软:0~5分 滋味
(25分)纯正性、持久性25分 咀嚼时,有较浓郁的清香和甜味:
22~25分咀嚼时,有淡淡的清香滋味和甜味:18~21分 咀嚼时,无清香滋味和甜昧,
但无异味:16~17分咀嚼时,无清香滋昧和甜味,
但有异味;0~15分冷饭质地
(5分)成团性、粘弹性、
硬度5分较松散,粘弹性较好,
硬度适中:4~5分结团,粘弹性稍差,稍变硬:2~3分 板结,粘弹性差,偏硬:0~1分 表 2 米饭物性指标与感官评价结果的相关关系
Table 2. Correlation analysis of rice physical indexes and sensory evaluation results
指标 水分 脂肪 碘蓝值 总淀粉 膨胀率 固形物 硬度 粘着性 弹性 回复性 饭粒完整性 −0.757* 0.181 0.206 0.630 −0.129 0.170 0.191 −0.526 −0.070 0.238 颜色 0.640 −0.660 0.261 −0.553 0.209 0.3
1−0.327 0.411 0.356 0.118 光泽 −0.014 −0.494 0.2
7−0.296 −0.270 0.167 0.253 0.382 −0.302 −0.409 通透度 0.366 −0.209 0.077 −0.486 0.587 −0.197 0.268 0.423 0.074 −0.011 顺滑 0.007 0.585 0.114 0.127 0.066 −0.524 0.166 0.042 0.391 0.260 粘性 −0.459 0.021 −0.353 0.617 −0.076 0.198 −0.314 −0.951** −0.281 0.413 弹性
得分−0.154 0.211 0.126 0.276 0.094 0.081 0.001 −0.207 0.700* 0.282 软硬度 0.299 −0.202 −0.260 0.012 0.061 0.601 −0.838** −0.360 0.151 0.383 冷饭回生 0.444 −0.125 0.278 −0.527 0.532 0.002 −0.028 0.225 0.609 0.579 味道 0.048 −0.154 0.338 0.065 0.140 0.126 −0.296 −0.414 0.476 0.921** 气味 −0.367 0.793* −0.053 0.201 −0.207 −0.564 0.597 0.217 0.023 −0.425 注:*在0.05级别(双尾),相关性显著;**在0.01级别(双尾),相关性极显著。 表 3 各主成分的特征值、贡献率与累计贡献率
Table 3. Characteristic value, contribution rate and cumulative contribution rate of each principal component
成分 特征值 方差贡献率(%) 累计方差贡献率(%) 1 2.027 33.787 33.787 2 1.754 29.230 63.017 3 1.432 23.865 86.882 4 0.556 9.271 96.153 5 0.133 2.222 98.374 6 0.098 1.626 100.000 表 4 米饭品质评价指标主成分特征向量
Table 4. Principal component characteristic direction scale of rice quality evaluation index
代号 第一成分Z1 第二成分Z2 第三成分Z3 X1 0.910 0.184 0.274 X2 0.717 −0.366 −0.344 X3 −0.605 0.625 0.066 X4 −0.563 −0.772 −0.129 X5 0.016 0.100 0.973 X6 0.049 0.768 −0.534 表 5 回归方程的方差分析
Table 5. Analysis of variance of regression equation
变异来源 平方和 自由度df 均方 F值 Sig. 回归 2665.44 6 444.24 1574.387 0.001 残差 0.56 2 0.28 总计 2666.00 8 表 6 模型参数汇总
Table 6. Summary of model parameters
R R2 调整后的R2 标准估算的误差 德宾-沃森统计量 0.972 0.945 0.779 1.021 0.703 表 7 米饭食用品质感官评分与主成分综合得分及排名
Table 7. Ranking of rice sensory score and principal component comprehensive score
样品 蒸煮方法 感官总分 主成分
得分主成分
排名感官评价
排名康弘1号 直热式常压蒸煮 67.72 34 5 6 IH常压蒸煮 71.41 54 1 1 IH压力蒸煮 70.71 47 2 2 稻花香 直热式常压蒸煮 68.56 44 3 4 IH常压蒸煮 68.18 20 7 5 IH压力蒸煮 66.78 3 9 8 吉林小町米 直热式常压蒸煮 70.56 39 4 3 IH常压蒸煮 67.07 28 6 7 IH压力蒸煮 64.69 4 8 9 -
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