Optimization of Process for Preparation of Arabinoxylan from Vinegar Residue and Its Effect on the Quality of Steamed Bread
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摘要: 采用碱提法从醋糟中提取阿拉伯木聚糖。对NaOH(含0.88% H2O2)浓度、提取温度、料液比、提取时间进行单因素实验,得到阿拉伯木聚糖得率最高的四个参数水平,并在此基础上,利用响应面法优化碱提阿拉伯木聚糖最佳工艺条件,并对优化工艺所得的多糖进行了单糖组成分析、分子量等分析以及对馒头品质的影响。结果表明:最佳实验条件为:NaOH(含0.88% H2O2)浓度0.92 mol/L,提取温度75 ℃,料液比1:35 g/mL,提取时间1.5 h,所得阿拉伯木聚糖得率为8.75%。得到醋糟阿拉伯木聚糖(AX)主要由阿拉伯糖、半乳糖、葡萄糖、木糖、半乳糖醛酸、葡萄糖醛酸6种单糖组成,含量分别为38.9%、1.32%、2.37%、55.84%、0.66%、0.91%。提取的阿拉伯木聚糖分散系数为2.45,均一性较好,分子量分布比较均匀,重均分子量为245997。同时,向面粉中添加适量的醋糟AX,能够降低馒头的硬度、黏性,可以改善馒头的质构特性,提高馒头的品质。本研究所获得的阿拉伯木聚糖具有较好的功能特性,为醋糟综合利用提供数据和理论支撑。Abstract: The arabinoxylan was extracted from the vinegar residues by alkaline extraction. Single-factor experiments were carried out on the concentration of NaOH (containing 0.88% H2O2), extraction temperature, solid-liquid ratio, and extraction time, and the four parameter levels with the highest extraction rate of arabinoxylan were found. On this basis, the response surface method was used to optimize. The monosaccharide composition and molecular weight of the optimized polysaccharides were analyzed and their effects on the quality of steamed bread were studied. The results showed that the optimal experimental conditions for alkaline extraction of arabinoxylan were as follows: NaOH (containing 0.88% H2O2) concentration 0.92 mol/L, extraction temperature 75 ℃, solid-liquid ratio 1:35 g/mL, extraction time 1.5 h, the yield of arabinoxylan was 8.75%. The main monosaccharides extracted by this experiment were as follow: Arabinose, galactose, glucose, xylose, galacturonic acid, glucuronic acid with ration of 38.9%, 1.32%, 2.37%, 55.84%, 0.66%, 0.91%. The dispersion coefficient of the arabinoxylan extracted by this method was 2.45, average molecular weight was 245997, indicating arabinoxylan was a homogeneous polysaccharide. Additional, adding an appropriate amount of vinegar AX to the flour could reduce the hardness and viscosity of the steamed bread, improve the texture characteristics of the steamed bread, and improve the quality of the steamed bread. The arabinoxylan obtained in this study had good functional characteristics, which also provided data and theoretical support for the utilization of vinegar residues.
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Key words:
- vinegar residues /
- arabinoxylan /
- response surface methodology /
- alkaline extraction /
- steamed bread
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表 1 AX提取工艺优化响应面分析试验因素水平设计
Table 1. Independent variables and their coded values tested in response surface analysis of AX extraction process
水平 因素 X1:料液比
(g/mL)X2:提取温度
(℃)X3:提取时间
(h)X4:NaOH
(mol/L)−1 1:20 40 1 0.2 0 1:40 60 3 0.6 1 1:60 80 5 1.0 表 2 醋糟化学成分分析
Table 2. Component analysis of vinegar residues
名称 水分 纤维素 木聚糖 阿拉伯聚糖 木质素 灰分 含量(%) 67.00±0.23 18.41±0.32 11.48±0.21 4.90±0.09 24.59±0.40 5.54±0.06 表 3 醋糟AX提取响应面分析试验设计及结果
Table 3. Experimental design and results of response surface analysis for AX extraction of vinegar residues
实验号 X1 X2 X3 X4 Y:AX得率
(%)1
2
3
4
5
6
7
8
9
10
11
12
13
14
150
0
0
0
−1
1
−1
1
−1
1
−1
−1
1
1
00
0
−1
1
0
0
−1
−1
1
1
0
0
0
0
−1−1
1
0
0
0
0
0
0
0
0
−1
1
−1
1
−1−1
−1
−1
−1
−1
−1
0
0
0
0
0
0
0
0
01.27
4.81
2.39
4.12
1.72
3.25
6.73
5.05
6.00
6.84
4.28
6.37
3.95
6.61
3.3616
17
18
19
20
21
22
23
24
25
26
27
28
290
0
0
0
0
0
0
0
0
0
0
0
−1
1−1
1
1
0
0
0
0
0
0
0
−1
1
0
01
−1
1
0
0
0
0
0
−1
1
0
0
0
00
0
0
0
0
0
0
0
1
1
1
1
1
18.56
5.28
8.12
6.54
6.52
6.73
6.98
7.11
6.14
8.08
7.57
8.80
7.73
7.22表 4 响应面模型方差分析
Table 4. ANOVA for response surface quadratic model
方差来源 平方和 自由度 F值 P值 模型 112.49 14 33.85 <0.0001 X1-料液比
X2-提取时间
X3-提取温度
X4-NaOH浓度
X1X2
X1X3
X1X4
X2X3
X2X4
X3X4
X12
X22
X32
X42
残差
失拟性
纯误差
总离差0.0007
2.52
27.82
65.24
1.59
0.081
1.04
1.39
0.063
0.64
3.78
0.095
2.56
7.77
3.32
3.05
0.28
115.811
1
1
1
1
1
1
1
1
1
1
1
1
1
14
10
4
280.0028
10.62
117.19
274.87
6.69
0.34
4.38
5.87
0.26
2.70
15.91
0.40
10.78
32.72
4.41
0.9582
0.0057
<0.0001
<0.0001
0.0215
0.5679
0.0550
0.0296
0.6158
0.1228
0.0013
0.5381
0.0054
<0.0001
0.0829
表 5 阿拉伯木聚糖相对分子量分布
Table 5. Relative molecular weight distribution of arabinoxylan
分子结构特征 分子量(Daltons) 多分散系数 Mw Mn Mz Mw/Mn 醋糟阿拉伯木聚糖 245997 100552 447767 2.45 表 6 馒头质构分析数据
Table 6. Steamed bread texture analysis data
添加量(%) 样品高度(mm) 脆度(gf) 黏着度(gf·s) 弹性 咀嚼性(gf) 胶着性(gf) 硬度(gf) 内聚性 回复性 0 26.7 745.6 −1.31 0.90 542.7 602.2 745.6 0.808 0.486 0.2 27.2 1152.9 −0.41 0.90 825.1 919.9 1152.9 0.799 0.464 0.4 27.3 473.1 −14.84 0.89 341.1 382.2 473.1 0.808 0.462 0.6 27.3 518.3 −8.04 0.88 363.7 414.1 518.3 0.803 0.461 0.8 27.5 666.0 −3.06 0.89 462.2 520.0 666.0 0.781 0.444 1.0 28.2 594.2 −2.41 0.88 412.0 468.2 594.2 0.789 0.445 -
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