Effects of Different Color Protection and Drying Methods Treatment on the Quality of Asparagus Powder
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摘要: 为改善并对比芦笋在热风、真空冷冻和微波干燥过程中出现的褐变问题,故采用不同的护色剂对芦笋进行浸泡、喷涂护色处理。结果显示,相较于不护色,经护色的芦笋粉营养及色泽品质更佳。其中护3的护色效果显著(P<0.05)优于护2和护1。干燥方式和护色剂的协同使用优于单独干燥。其中,护色剂-真空冷冻干燥(VFD)协同处理的芦笋粉的酚类物质保留程度、结构完整性、色泽及抗氧化能力最佳;护色剂-热风干燥(HAD)协同处理的芦笋粉组织结构稀疏分散,酚类含量、色泽、抗氧化能力不及VFD;而护色剂-微波干燥(MD)所得芦笋粉色泽焦黄,营养及色泽品质最差。此外,相较于浸泡,经喷涂的芦笋粉水可溶性膳食纤维(SDF)含量更高,葡萄糖、胆固醇吸附能力也更好,但前者的护色效果更佳。主成分分析结果表明,芦笋粉的总酚和芦丁含量,以及理化和功能性质指标与其营养及色泽品质具有高度相关性。综合品质排名前三的芦笋粉为护3-浸泡-VFD、护2-浸泡-VFD和护3-喷涂-VFD;后三为护1-喷涂-MD、护2-喷涂-MD、对照-MD。本研究结果为提高芦笋干燥产品品质提供理论依据。Abstract: Different color protection agents were used to soak and spray the asparagus for color protection due to improve and compare the browning problem of asparagus during the process of hot air, vacuum freezing and microwave drying. The results showed that the quality of nutrition and color of asparagus powder with color protection was better than that without color protection. The color protection effect of Hu3 was significantly better than that of Hu2 and Hu1 (P<0.05). The synergistic use of drying method and color fixative was better than that of single drying. Among them, the retention degree of phenols, structural integrity, color and antioxidant capacity of asparagus powder treated by color fixative and vacuum freeze drying (VFD) were the best. The structure of asparagus powder treated by color fixative and hot air drying (HAD) was sparse and dispersed, and the content of phenols, color and antioxidant capacity were lower than VFD. However, the asparagus powder obtained by color fixative and microwave drying (MD), was bright yellow, with the worst nutrition and color quality. In addition, compared with soaking, the water soluble dietary fiber (SDF) content of sprayed asparagus powder was higher, and the adsorption capacity of glucose and cholesterol was better, but the color protection effect of the former was better. The results of principal component analysis showed that the total phenol, rutin, physicochemical and functional properties of asparagus powder were highly correlated with its nutrition and color quality. The top three asparagus powder in terms of comprehensive quality were Hu3-Soak-VFD, Hu2-Soak-VFD and Hu3-Spray-VFD. The last three were Hu1-Spray-MD, Hu2-Spray-MD and control-MD. The results of this study provide a theoretical basis for improving the quality of dried asparagus products.
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表 1 芦笋粉组成成分分析
Table 1. Composition analysis of asparagus powder
组别 总酚(mg GAE/g DW) 总黄酮(mg RE/g DW) 芦丁(mg RE/100 g DW) IDF(g/100 g) SDF(g/100 g) MD 对照 4.06±0.00d 2.98±0.03d 56.32±2.70e 59.11±0.54b 15.26±0.18c 护1-浸泡 4.98±0.00cd 3.83±0.22bc 83.56±0.63b 59.29±0.90b 14.31±0.11f 护1-喷涂 4.53±0.08bc 3.29±0.12cd 59.33±1.25de 60.36±9.68a 14.56±0.62e 护2-浸泡 5.46±0.05b 4.70±0.12a 105.18±0.19a 64.08±0.87a 14.75±0.18d 护2-喷涂 5.00±0.19bc 3.88±0.28bc 80.67±2.97bc 64.45±0.87a 15.75±0.27b 护3-浸泡 6.51±0.07a 4.26±0.22bc 88.95±7.37b 64.43±1.14a 14.55±0.15e 护3-喷涂 5.10±0.01b 3.78±0.07bc 70.79±4.06cd 65.31±0.34a 16.37±1.12a VFD 对照 6.37±0.05d 3.64±0.08d 95.73±0.07d 63.85±0.10c 14.98±0.50f 护1-浸泡 6.95±0.17c 3.75±0.10cd 111.62±3.78c 60.06±0.65e 15.99±0.22e 护1-喷涂 6.86±0.28c 3.45±0.27d 102.14±2.73d 61.04±0.74de 16.56±1.24c 护2-浸泡 8.52±0.10b 4.61±0.23ab 125.62±0.54b 65.80±0.71a 17.13±0.57b 护2-喷涂 8.25±0.12b 3.69±0.04cd 114.81±1.82c 64.41±0.13b 17.52±0.12a 护3-浸泡 9.46±0.03a 4.87±0.07a 142.84±0.67a 61.21±1.37d 16.03±0.26d 护3-喷涂 8.45±0.02b 4.18±0.06bc 130.32±0.08b 63.38±1.04c 16.58±0.74c HAD 对照 5.63±0.03d 3.05±0.05c 73.95±0.23d 64.65±3.18a 15.01±0.02a 护1-浸泡 5.85±0.06c 3.28±0.19abc 82.52±3.93d 62.73±0.78a 14.18±1.23a 护1-喷涂 5.76±0.04c 3.21±0.05bc 59.09±6.76e 61.13±0.12a 15.87±0.02a 护2-浸泡 6.20±0.03b 3.60±0.00a 110.37±0.82b 64.86±0.41a 14.18±0.60a 护2-喷涂 5.88±0.03c 3.31±0.15abc 98.08±1.34c 63.18±0.31a 15.39±0.86a 护3-浸泡 7.11±0.02a 3.47±0.06ab 129.69±1.01a 64.45±0.31a 14.71±0.61a 护3-喷涂 6.20±0.00b 3.41±0.03abc 124.42±2.54a 64.69±0.78a 15.56±0.71a 注: 同一干燥方式下不同护色处理组内字母不同表示差异性显著(P<0.05),表2~表3同。 表 2 芦笋粉基本理化性质分析
Table 2. Analysis of basic physical and chemical properties of asparagus powder
组别 持水性(g/g) 持油性(g/g) 吸水膨胀性(mL/g) 组别 持水性(g/g) 持油性(g/g) 吸水膨胀性(mL/g) MD 对照 3.46±0.10e 1.59±0.05a 2.71±0.05cd VFD 护2-喷涂 7.93±0.28a 2.21±0.17a 7.05±0.46bc 护1-浸泡 3.81±0.05d 1.31±0.24bc 2.43±0.33d 护3-浸泡 6.90±0.18d 2.23±0.01a 8.55±0.40a 护1-喷涂 3.65±0.01d 1.03±0.01c 3.17±0.09bcd 护3-喷涂 7.14±0.02cd 2.08±0.06ab 7.94±0.29ab 护2-浸泡 4.38±0.02c 1.22±0.05c 3.37±0.25ab HAD 对照 4.05±0.03cd 2.41±0.03ab 4.55±0.01b 护2-喷涂 4.73±0.02b 1.12±0.09c 3.89±0.18a 护1-浸泡 4.26±0.04c 2.26±0.05b 4.19±0.02c 护3-浸泡 4.24±0.06c 1.33±0.03bc 2.54±0.07cd 护1-喷涂 3.94±0.04d 2.50±0.09a 3.31±0.10d 护3-喷涂 5.49±0.06a 1.29±0.00bc 3.61±0.00ab 护2-浸泡 3.87±0.07d 2.27±0.00b 3.49±0.04d VFD 对照 4.07±0.01e 2.08±0.48ab 4.06±0.04d 护2-喷涂 5.03±0.06a 2.00±0.04c 6.36±0.01a 护1-浸泡 7.45±0.09bc 1.85±0.01bc 7.09±0.05b 护3-浸泡 3.87±0.04d 2.27±0.01b 4.12±0.10c 护1-喷涂 6.89±0.03d 1.77±0.03c 5.94±0.50c 护3-喷涂 4.53±0.12b 2.03±0.12c 4.03±0.08c 护2-浸泡 7.90±0.07ab 2.34±0.13a 7.92±0.14ab 表 3 芦笋粉色度值
Table 3. Chroma value of asparagus powder
组别 L* a* b* 组别 L* a* b* MD 对照 66.68±1.03d −2.18±0.06e 16.33±0.14c VFD 护2-喷涂 81.00±0.75ab −6.19±0.03bc 22.68±0.51a 护1-浸泡 71.77±1.15a −2.38±0.05f 19.58±0.52ab 护3-浸泡 80.33±0.97b −6.47±0.14c 22.99±0.36a 护1-喷涂 69.14±0.50bc −1.85±0.06d 19.10±0.24b 护3-喷涂 81.67±0.07ab −6.38±0.01c 22.96±0.28a 护2-浸泡 70.67±0.67ab −1.12±0.09c 20.05±0.10a HAD 对照 87.42±0.10a −3.10±0.04a 18.18±0.04d 护2-喷涂 70.33±1.02abc −0.69±0.05a 19.11±0.69b 护1-浸泡 83.43±0.30d −3.56±0.05b 18.20±0.10d 护3-浸泡 71.27±0.21a −2.42±0.10f 20.83±0.28a 护1-喷涂 84.47±0.14c −3.53±0.04b 19.37±0.17b 护3-喷涂 68.42±0.90cd −0.89±0.08b 19.58±0.28ab 护2-浸泡 83.30±0.10e −3.72±0.06d 20.38±0.07a VFD 对照 81.17±0.29ab −5.92±0.13a 21.92±0.59a 护2-喷涂 85.41±0.47b −3.53±0.03b 18.20±0.23d 护1-浸泡 81.39±0.22ab −6.35±0.03bc 22.88±0.41a 护3-浸泡 82.38±0.23f −3.93±0.02e 20.40±0.06a 护1-喷涂 81.77±0.31a −6.33±0.05b 22.26±0.68a 护3-喷涂 84.50±0.22c −3.61±0.04c 18.85±0.09c 护2-浸泡 80.44±0.32ab −6.23±0.08bc 22.71±0.02a 表 4 不同护色处理和干燥方式芦笋粉品质主成分方差贡献率
Table 4. Variance contribution rate of main components of asparagus powder quality under different color protection treatments and drying methods
成分 解释的总方差 总计 方差百分比(%) 累积(%) PC1 8.95 52.67 52.67 PC2 2.87 16.88 69.55 PC3 1.59 9.33 78.88 表 5 不同护色处理和干燥方式芦笋粉品质主成分载荷矩阵数值
Table 5. Value of the principal component load matrix of asparagus powder under different color protection treatments and drying methods
成分 PC1 PC2 PC3 总酚 0.92 0.05 −0.07 总黄酮 0.45 0.59 0.36 芦丁 0.78 −0.09 0.28 IDF 0.32 −0.41 0.70 SDF 0.65 −0.10 0.59 持水性 0.85 0.27 0.09 持油性 0.55 −0.71 −0.29 吸水膨胀性 0.90 0.07 −0.11 葡萄糖吸附能力 0.51 −0.64 0.29 胆固醇吸附能力 0.53 0.65 −0.16 DPPH自由基清除能力 0.94 0.09 −0.15 超氧离子自由基清除能力 0.82 0.26 −0.23 羟基自由基清除能力 0.89 0.13 −0.21 总还原力 0.93 0.12 −0.06 L* 0.61 −0.70 −0.15 a* −0.84 0.28 0.30 b* 0.35 0.49 0.29 表 6 不同护色处理和干燥方式芦笋粉品质主成分综合得分
Table 6. Comprehensive score of quality principal components of asparagus powder under different color protection treatments and drying methods
组别 Z1 Z2 Z3 Z综 排名 组别 Z1 Z2 Z3 Z综 排名 MD 对照 −6.04 0.93 −2.22 −3.23 21 VFD 护2-喷涂 4.29 0.40 1.13 2.38 4 护1-浸泡 −2.54 2.33 −1.09 −1.04 16 护3-浸泡 4.91 1.63 −1.97 2.68 1 护1-喷涂 −3.40 1.53 −0.55 −1.58 19 护3-喷涂 4.09 1.95 −1.03 2.39 3 护2-浸泡 −2.67 0.55 2.17 −1.11 18 HAD 对照 −1.36 −1.78 −0.40 −1.05 17 护2-喷涂 −2.19 −3.39 −1.62 −1.88 20 护1-浸泡 −0.46 −1.88 −0.04 −0.57 12 护3-浸泡 −2.00 1.85 0.80 −0.67 14 护1-喷涂 −1.92 2.11 1.51 −0.52 11 护3-喷涂 −2.10 0.97 2.44 −0.71 15 护2-浸泡 0.54 −2.04 0.92 0.03 8 VFD 对照 0.55 −0.89 −0.18 0.12 7 护2-喷涂 0.23 −1.82 0.50 −0.14 10 护1-浸泡 3.14 0.92 −0.85 1.73 5 护3-浸泡 0.50 −1.86 0.18 −0.03 9 护1-喷涂 2.62 0.33 −0.50 1.39 6 护3-喷涂 −0.71 −1.27 −0.12 −0.60 13 护2-浸泡 4.53 −0.56 1.07 2.43 2 -
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