Effects of the Mixing Ratio of Purple Rice and Indica Rice on the Properties of Mixed Powder and the Quality of Purple Rice Noodles
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摘要: 本文通过混配高直链淀粉的籼米粉来改善紫米粉性质,研究复配粉不同配比对原料性质及紫米粉丝品质的影响。将紫米粉与籼米粉按照一定比例进行复配并制作粉丝,以复配粉的直链淀粉含量、溶解度、膨润力、胶稠度、糊化及凝胶特性为理化性质测定指标,以紫米粉丝的蒸煮、花色苷含量及保留率与感官品质为评价指标,得到了优选原料粉复配比例为籼米粉:紫米粉为8:2。在该配比下,复配粉的直链淀粉含量由紫米粉的15.75 g/100 g增加到26.86 g/100 g,溶解度降低为6.24 g/100 g,膨润力减少为6.80 g/g,胶稠度由中软稠度变为硬稠度,低谷黏度、最终黏度与回生值增大,凝胶硬度与持水性增大,粘结性与失重率降低。上述原料性质的变化增强了紫米粉丝凝胶的结构强度,降低了其粘性,优化了其水合性质,最终改善紫米粉丝品质。最适配比下制作的紫米粉丝品质为:复水时间为508 s,断条率为9.67%,蒸煮损失率为34.37%,蒸煮品质与市售米粉丝水平相近,花色苷含量为18.36 mg/100 g,保留率达到65.68%,颜色紫红,带有紫米清香,软硬适中。Abstract: In this paper, the properties of purple rice powder were improved by mixing high amylose indica rice powder, and the effect of different proportions of mixed powder on the properties of raw materials and the quality of purple rice noodles was studied. The purple rice powder and the indica rice powder were mixed according to a certain proportion to make noodles. The physicochemical properties of mixed powder including amylose content, solubility, swelling power, gel consistency, gelatinization and gel properties were used as determination indexes. And the cooking, anthocyanin content and retention rate and sensory quality of purple rice noodles were used as evaluation indicators. The results showed that the optimum proportion of raw material powder was indica rice powder: purple rice powder=8:2. Under this ratio, the amylose content of the mixed powder increased from 15.75 g/100 g of pure purple rice powder to 26.86 g/100 g, the solubility decreased to 6.24 g/100 g, the swelling force decreased to 6.80 g/g, and the gel consistency decreased from the medium-soft consistency to hard consistency, the trough viscosity, final viscosity and retrogradation value increased, the gel hardness and water holding capacity increased, and the adhesiveness and weight loss rate decreased. The above-mentioned changes in the properties of the raw materials enhanced the structural strength of the purple rice noodles gel, reduced its stickiness, optimized its hydration properties, and finally improved the quality of the purple rice noodles. The quality of purple rice noodles made under the optimum ratio was as follows: The cooking time was 508 s, the broken strip rate was 9.67%, the cooking loss rate was 34.37%, the cooking quality was similar to the commercial rice noodles, the anthocyanin content was 18.36 mg/100 g, the retention rate reached 65.68%, and the color was purple, with the fragrance of purple rice, moderate hardness and softness.
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表 1 紫米粉丝感官评分标准
Table 1. Sensory scoring standards of purple rice noodles
评价指标 含义 评分分级 色泽 具有纯粹的紫米色泽,颜色均匀,透明 优、良、中、差 气味 拥有紫米独特的清香味,气味纯正 优、良、中、差 形态 具有光滑的表面和完整的形态 优、良、中、差 口感 弹性好,爽滑不粘牙,软硬适中 优、良、中、差 表 2 复配粉的基础理化性质
Table 2. Basic physical and chemical properties of compound powder
复配比例
籼米:紫米复配粉基础理化性质 直链淀粉含量
(干基)(g/100 g)溶解度
(g/100 g)膨润力
(g/g)胶稠度
(mm)10:0
(籼米粉)29.56±0.42a 4.81±0.48e 6.22±0.32f 51.0±2.65a 9:1 28.22±0.34a 6.06±0.03d 6.65±0.20e 37.7±2.52c 8:2 26.86±0.20b 6.24±0.00d 6.80±0.15de 27.7±1.53d 7:3 25.46±0.48c 6.40±0.00cd 7.17±0.29d 24.0±1.00de 6:4 23.87±0.20d 6.70±0.04bc 7.65±0.10c 22.0±1.00e 5:5 22.64±0.29e 6.96±0.26b 8.03±0.27b 21.0±1.00e 0:10
(紫米粉)15.75±0.29f 10.02±0.26a 12.85±0.07a 46.0±4.36b 注:同一列上英文字母的不同表示均值之间存在显著性差异(P<0.05);表3、表4同。 表 3 复配粉的糊化特性
Table 3. Gelatinization characteristics of compound powder
复配比例
籼米:紫米复配粉糊化特性 峰值黏度(cP) 低谷黏度(cP) 衰减值(cP) 最终黏度(cP) 回生值(cP) 糊化温度(℃) 10:0
(籼米粉)3905±11e 2356±8bc 1538±7g 4697±9d 2338±5a 82.30±0.10a 9:1 3885±10f 2253±8d 1575±4f 4638±11e 2317±8b 82.62±0.51a 8:2 4000±10b 2407±6a 1601±7e 4791±7b 2277±4c 82.27±0.06a 7:3 4053±10a 2368±17b 1639±5d 4826±6a 2244±6d 82.33±0.06a 6:4 3975±6c 2345±14c 1678±8c 4799±11b 2218±5e 81.05±0.44b 5:5 3948±7d 2255±10d 1698±6b 4727±12c 2197±5f 81.26±0.49b 0:10
(紫米粉)3759±10g 1931±9e 1816±16a 3954±18f 2017±17g 76.60±0.15c 表 4 复配粉的凝胶特性
Table 4. Gel characteristics of compound powder
复配比例
籼米:紫米质构特性 水合特性 硬度(gf) 粘结性(gf) 持水性
H(%)失重率L(%) 10:0
(籼米粉)2213±22a −1.07±0.29a 12.33±0.13a 4.92±0.03e 9:1 2076±30b −1.18±0.04a 10.22±0.44b 6.57±0.14d 8:2 1897±20c −1.30±0.00ab 9.77±0.22bc 7.47±0.12c 7:3 1730±20d −1.42±0.00b 9.43±0.45c 7.95±0.28b 6:4 1583±19e −1.52±0.08b 8.69±0.22d 8.68±0.14a 5:5 1413±23g −1.91±0.01c 7.62±0.08e 8.88±0.34a 0:10
(紫米粉)1482±33f −2.11±0.13c 5.88±0.10f 7.97±0.22b 表 5 不同配比复配粉制作的紫米粉丝的感官投票结果
Table 5. The sensory voting results of purple rice noodles made from rice powder blends with different proportions
籼米粉:紫米粉 色泽(20%) 气味(20%) 形态(25%) 口感(35%) 优 良 中 差 优 良 中 差 优 良 中 差 优 良 中 差 9:1 0 6 4 0 3 6 1 0 2 8 0 0 2 7 1 0 8:2 8 2 0 0 7 2 1 0 7 3 0 0 8 2 0 0 7:3 0 2 7 1 2 5 3 0 0 5 5 0 1 5 4 0 6:4 0 1 6 3 0 6 4 0 0 3 7 0 0 2 8 0 5:5 0 0 4 6 0 7 3 0 0 0 3 7 0 0 4 6 表 6 紫米粉丝模糊评价结果
Table 6. Fuzzy evaluation results of purple rice noodles
籼米粉:紫米粉 评价结果集 感官评价总分 9:1 (0.180,0.685,0.135,0.000) 80.45 8:2 (0.755,0.225,0.020,0.000) 87.35 7:3 (0.075,0.440,0.465,0.000) 74.51 6:4 (0.000,0.285,0.655,0.060) 68.69 5:5 (0.000,0.140,0.355,0.505) 36.35 表 7 不同配比紫米粉丝的综合评价
Table 7. Comprehensive evaluation of purple rice noodles with different proportions
籼米粉:紫米粉 实验结果 最终评分 名次 Z蒸煮
(40%)Z花色苷
(30%)Z感官
(30%)9:1 1.0000 0.0000 0.8647 0.6594 3 8:2 0.8275 0.6765 1.0000 0.8339 1 7:3 0.3996 1.0000 0.7483 0.6843 2 6:4 0.2304 0.3462 0.6340 0.3862 4 5:5 0.0000 0.1794 0.0000 0.0538 5 -
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