Effect of Moisture on High Hydrostatic Pressure Treated Waxy Maize Starch and Tapioca Starch
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摘要: 利用高静压(HHP)作为物理变性方法处理糯玉米淀粉和木薯淀粉,考察水分含量对不同类型淀粉的糊化及重结晶的影响。用偏光显微镜、扫描电子显微镜观测HHP处理后淀粉颗粒的形态变化,利用激光粒度分析仪记录淀粉颗粒的粒度分布及变化规律,结合X射线衍射曲线及低场核磁共振图谱, 分析淀粉颗粒内水分的结合方式及程度。结果表明:当粉水比(淀粉质量和水质量之比)为3/10~5/10时,在HHP处理下,两种淀粉均发生结晶解体和溶胀现象。糯玉米淀粉的重结晶程度顺序为4/10粉水比 > 3/10粉水比 > 5/10粉水比; 木薯淀粉颗粒结晶结构完全消失,结晶破坏的程度是3/10粉水比 > 4/10粉水比 > 5/10粉水比。随着水分含量增大,糯玉米淀粉及木薯淀粉的粒度逐渐增大。干燥后淀粉中的水分主要以结合水的形式存在,且水分参与结晶结构的形成。Abstract: Waxy maize and tapioca starch with different starch-water ratios were treated by high hydrostatic pressure (HHP)-a physical modification method-under 600 MPa.The effects of moisture content on gelatinization and retrogradation properties of the two kinds of starch were investigated.The appearance and particle size of granules were studied by micro-polariscopy, scanning electron microscopy and laser diffraction instrument.Combining the X-ray diffraction and nuclear magnetic resonance (NMR) spectrum, the change from crystal to non-crystal was confirmed again, and the water status in starch was studied, too.The results indicate that the crystalline structure destroying and gelatinization happen when the starch-water ratio was between 3/10 and 5/10.The degree of retrogradation for waxy maize starch was 4/10 > 3/10 > 5/10 (starch-water ratio), whereas the degree of crystalline structure destroying for tapioca starch was 3/10 > 4/10 > 5/10 (starch-water ratio).The diameter of waxy maize and tapioca starch granules increased significantly with moisture content.Water was kept within the crystalline lamella in the form of bond water.
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Key words:
- high hydrostatic pressure (HHP) /
- water /
- starch /
- gelatinization /
- retrogradation
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表 1 不同粉水比的糯玉米及木薯淀粉HHP处理后颗粒的粒径分布
Table 1. Parameters of particle size distribution for HHP modified waxy maize and tapioca starch with different starch-water ratios
Material Starch-water
ratioParticle size distribution/(%) Mean/(μm) dspan CV/(%) DS/(%) <10 μm 10~20 μm 20~40 μm 40~70 μm >70 μm Waxy
maize starch1/10 8.71±0.70ab 13.99±15.15ab 26.60±1.27b 21.95±0.64ab 27.60±2.97e 53.41±4.24c 2.80±0.04c 81.25±0.21b 21.55±0.32bc 3/10 9.57±2.02ab 14.83±4.20a 28.05±7.00ba 24.20±0.14b 23.30±5.29f 48.71±6.96e 2.34±0.13abc 75.15±0.92ab 36.69±7.95abc 5/10 11.20±1.56bcd 18.60±0.57bc 31.75±1.06c 24.00±2.26ab 14.50±0.85c 38.70±0.88c 2.30±0.21abc 74.30±5.94ab 11.15±8.89abc 7/10 13.95±1.77de 20.90±2.55c 36.40±0.99de 20.70±3.95ab 8.08±0.65b 32.85±0.80ab 2.15±0.26ab 78.15±9.55ab 25.65±2.51c 1 14.95±0.92e 21.95±1.91c 38.10±0.85e 21.45±2.76ab 3.54±0.80a 29.05±0.51a 1.92±0.10a 67.30±5.52a 0.68±8.25a Tapioca
starch1/10 16.35±0.92ab 19.20±0.00ab 31.80±1.41a 22.10±0.71d 10.53±1.23ab 33.71±0.40c 2.34±0.14a 74.70±1.98a 6.56±2.83a 3/10 16.85±1.20ab 20.25±1.48abc 31.25±0.07a 20.80±1.70cd 10.85±1.60ab 33.46±1.48b 2.46±0.10a 77.55±3.04a 10.63±4.33a 5/10 21.45±0.49ab 26.20±1.84bcd 30.70±2.40a 16.85±1.34bcd 4.61±3.32a 26.55±2.93ab 2.46±0.27a 78.20±5.66a 11.56±0.08a 7/10 25.50±0.85b 32.20±0.71de 25.90±0.42a 12.00±0.28abc 4.40±1.41a 23.30±1.33ab 2.77±0.04a 88.30±4.95a 25.97±7.06a 1 29.40±1.13b 40.30±4.81e 22.25±1.20a 6.20±2.26a 1.87±2.64a 18.43±2.79a 2.47±0.44a 86.00±22.63 22.68±3.27a Note:(1) All values are mean values of triplicate determinations±standard deviations;
(2) Values sharing the same uppercase letter within a line are not significantly different(P<0.05);
(3) Mean:De Brouckere diameter;dspan:Measurement of the width of size distribution, the narrower the distribution, the smaller the dspan is; CV:Volumetric concentration; DS:Swelling degree,DS=(CV-CV Native)/CV Native.表 2 不同粉水比的糯玉米和木薯淀粉在600 MPa HHP处理后的X射线衍射参数
Table 2. X-ray powder diffraction parameters for 600MPa HHP modified waxy maize and tapioca starch with different stach-water ratios
Material Stach-water
ratioHalf peak height Peak area Total area Relative crystallinity/
(%)15.0° 17.2° 17.8° 22.9° Waxy
maize1/10 2 293 2 996 3 232 2 307 0.33 20 106 0.00±0.00a 3/10 1 511 835 2 067 841 7 247 27 937 14.39±0.12b 5/10 1 735 2 182 2 042 2 351 340 735 990 797 34.39±0.08d 7/10 1 951 2 936 2 020 2 411 215 566 859 177 25.09±0.03c 1 2 039 2 429 2 017 2 406 274 046 1 045 979 26.20±0.04d Material Starch-water
ratioHalf peak height Peak area Total area Relative crystallinity/
(%)15.3° 17.2° 17.8° Tapioca
starch1/10 423.5 1 019 1 262 17.12 400 624 0.00±0.00a 3/10 847.5 1 817 775 115 877 436 0.01±0.15a 5/10 258 397 74 7 728 39 618 0.00±0.77a 7/10 1 992 2 373 1 837 270 048 580 312 40.54±0.08b 1 1 860 2 208 1 741 292 510 615 941 47.49±0.01c Note:The relative crystallinity values were triplicate determinations±standard deviations. -
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