共查询到20条相似文献,搜索用时 289 毫秒
1.
2.
淀粉的流变学特性是影响工业化淀粉质食品品质的重要因素.本文通过碱法优化提取工艺制备了黄米淀粉产品,分析了黄米淀粉的基本理化指标,并利用Brabender糊化仪和Brookfield旋转黏度仪研究了黄米淀粉的糊化特性、流变特性以及机械剪切触变性能,为黄米淀粉在食品工业的应用提供理论依据.结果表明:黄米淀粉中蛋白质残留量为0.232%,淀粉纯度为88.98%,淀粉得率为58.6%,直链淀粉含量为18.28%,起糊温度为73.9℃;峰值黏度为702BU;与马铃薯淀粉、大米淀粉及玉米淀粉相比,黄米淀粉糊具有较强的黏度冷稳定性以及较弱的凝胶性和凝沉性;黄米淀粉糊属于非牛顿型、假塑性、剪切稀化的触变性流体;在同一剪切速率下,表观粘度随温度的增加而降低;在同一温度下,淀粉糊的表观粘度随剪切速率的增加而减小. 相似文献
3.
黄米淀粉的制备及流变学特性的研究 总被引:2,自引:0,他引:2
淀粉的流变学特性是影响工业化淀粉质食品品质的重要因素。通过碱法优化提取工艺制备了黄米淀粉产品,分析了黄米淀粉的基本理化指标,并利用Brabender糊化仪和Brookfield旋转黏度仪研究了黄米淀粉的糊化特性、流变特性以及机械剪切触变性能,为黄米淀粉在食品工业的应用提供理论依据。结果表明:黄米淀粉中蛋白质残留量为0.232%,淀粉纯度为88.98%,淀粉得率为58.6%,直链淀粉含量为18.28%,起糊温度为73.9℃;峰值黏度为702BU;与马铃薯淀粉、大米淀粉及玉米淀粉相比,黄米淀粉糊具有较强的黏度冷稳定性以及较弱的凝胶性和凝沉性;黄米淀粉糊属于非牛顿型、假塑性、剪切稀化的触变性流体;在同一剪切速率下,表观黏度随温度的增加而降低;在同一温度下,淀粉糊的表观黏度随剪切速率的增加而减小。 相似文献
4.
5.
6.
谷氨酸对木薯淀粉糊流变性质的影响 总被引:1,自引:0,他引:1
采用哈克流变仪,研究谷氨酸对木薯淀粉糊流变性质的影响。结果表明:添加谷氨酸前后的木薯淀粉糊均为假塑性流体且具有触变性,随谷氨酸添加量的增加,假塑性和触变性均先增强后减弱;淀粉糊的表观黏度随剪切速率的升高而降低,具有剪切稀化现象。添加/未添加谷氨酸的木薯淀粉糊都呈现弱凝胶行为,随着谷氨酸添加量的增加,其储能模量(G')和耗能模量(G'')先增大后减小,损耗角正切值(tanθ)先减小后增大,最终趋向于牛顿流体的方向发展。 相似文献
7.
采用发酵法制备脚板薯淀粉,分析了其淀粉颗粒粒度、淀粉糊透明度及凝沉性等理化性质,并对淀粉质量浓度、糊化pH、温度、不同介质及其浓度对淀粉糊流变特性的影响进行了分析。结果表明:脚板薯淀粉得率为15.2%,纯度为97.6%;淀粉平均粒度为18291.5nm,淀粉糊透光率为27.92%,其凝沉时间短;淀粉糊黏度随着淀粉浓度的增加而增加,随着糊化温度的增加而减小;在酸性条件下,淀粉糊黏度随着糊化pH增加而减小,pH到达8时,黏度达最大值,后随碱性的增强淀粉糊黏度下降。加入食盐、氯化钙和蔗糖均可提高淀粉糊的黏度,且在相同的剪切速率下,淀粉糊黏度随着蔗糖添加量的增大而增大。 相似文献
8.
利用超声技术处理马铃薯淀粉糊,研究超声场下马铃薯淀粉糊剪切稀化及触变性变化规律。采用超声设备对马铃薯淀粉糊进行超声处理,采用超声波设备处理马铃薯淀粉糊样品,分别利用流变仪和Brabender黏度仪测定马铃薯淀粉糊剪切力和表观黏度,观察马铃薯淀粉糊剪切稀化和触变性变化特征和规律。结果表明:超声作用改变了马铃薯淀粉糊的剪切稀化程度,马铃薯淀粉糊的表观黏度与剪切速率呈负相关,而与超声声强、超声作用时间及淀粉糊浓度呈正相关性,呈现假塑性流体所特有的剪切稀化现象。且随着反应进行,超声作用显著改变了淀粉糊的触变性,使马铃薯淀粉糊的触变环面积显著减小,马铃薯淀粉糊的触变性变小。 相似文献
9.
10.
11.
《Food chemistry》1999,64(4):501-505
Rheological behaviour of gelatinized sago starch solution was studied over the shear rate range of 13.61–704 s−1 at various concentration and temperature ranges. A power law equation was used to describe the rheological behaviour of the starch solution, while the effect of temperature was evaluated by the Arrhenius equation. The effect of starch concentration on apparent viscosity was studied using the exponential model describing the relationship between apparent viscosity and concentration. Consistency index (κ) increased with concentration and decreased with the increase of temperature. Flow behaviour indices (η) were within the range of 0.495–0.559 which indicated the pseudoplastic nature of gelatinized sago starch. The amount of starch and shear rate affect activation energy (ΔE). Depending on the shear rate and concentration, activation energy varied from 0.619 to 1.756 kcal mol−1. A mathematical relationship correlating the various parameters (temperature, concentrations, shear rates) was tested for its significance and validity. 相似文献
12.
西米淀粉的物化性质研究 总被引:3,自引:0,他引:3
研究了西米淀粉的组成、颗粒形貌及糊化、透明度、老化方面的性质,并与木薯和马铃薯进行了比较。结果表明,西米淀粉的蛋白质含量为0.21%,直链淀粉含量为28%,颗粒为椭圆形,西米淀粉的起糊温度为70.3℃,热糊稳定性高,凝沉性比薯类淀粉弱,西米淀粉的透明度为57.5%,比薯类淀粉易老化。为进一步了解西米淀粉的特性及应用开发提供了一定的理论依据。 相似文献
13.
CL Siau AA Karim MH Norziah WD Wan Rosli 《Journal of the science of food and agriculture》2004,84(13):1722-1730
Cationic sago starches were prepared using an aqueous alkaline process with different levels of cationic reagent 3‐chloro‐2‐hydroxypropyltrimethylammonium chloride (0.01–0.10 M ), sodium hydroxide (0.03–0.86 M ) and reaction temperature (30–62 °C). The degree of substitution (DS), reaction efficiency, thermal and pasting properties of cationic sago starches were analysed. Emulsifying and fat binding properties of native sago starch, cationized sago starch and commercial chitosan were compared at two different pH values (4 and 7). Degree of substitution increased with an increase in concentration of cationic reagent or NaOH, or reaction temperature. The reaction efficiency was proportional to the concentration of NaOH and reaction temperature but inversely proportional to the cationic reagent concentration. The highest DS and reaction efficiency achieved was 0.06 and 79%, respectively. The pasting temperature and gelatinization enthalpy of cationic starch (DS 0.06) were lower compared with native sago starch. Cationization increased the peak viscosity and breakdown of the starch paste but decreased the setback. The presence of cationic groups significantly increased emulsion stability, emulsion viscosity and fat binding capacity of sago starch. However, the cationic sago starch was still inferior to chitosan, which showed the highest emulsion stability, emulsion viscosity and fat binding capacity. There was no significant difference between the surface tension values of native and cationic sago starch and chitosan. The influence of pH on emulsifying properties was not significant. The emulsion stability of the cationic sago starch improved due to an increase in viscosity and fat binding capacity but not its surface active property. Copyright © 2004 Society of Chemical Industry 相似文献
14.
西米辛烯基琥珀酸淀粉酯的结构表征及性质研究 总被引:2,自引:1,他引:1
采用现代仪器分析方法对西米辛烯基琥珀酸淀粉酯的结构特征、颗粒形貌、粒径分布、乳化性、糊粘度等性质进行了测定和研究,并以西米原淀粉作为参照。结果表明,西米淀粉经辛烯基琥珀酸酐处理后,产品的红外光谱在1570cm-1和1714cm-1处出现新的吸收峰,608cm-1处吸收峰加强;颗粒表面受到损害,形状发生不规则变化;颗粒粒径分布不均,平均粒径大于西米原淀粉;乳化能力和乳化稳定性有显著提高;糊粘度明显增大,热糊稳定性高,凝沉性较弱。为进一步研究西米辛烯基琥珀酸淀粉酯的开发应用提供了一定理论依据。 相似文献
15.
16.
17.
甘薯淀粉糊的流变特性 总被引:10,自引:0,他引:10
通过考察甘薯淀粉糊在不同甘薯淀粉浓度和不同温度下的流变特性,结果表明甘薯淀粉糊是典型的非牛顿型、剪切变稀的和触变性流体,温度越高,浓度越低,甘薯淀粉糊的滞后性越小;同时用幂律方程和Cross方程来描述糊的流变特性,发现Cross方程比幂律方程拟合精度更高。而浓度很低的情况下(如2%),甘薯淀粉糊的触变特性与其他浓度不同,表现为下行线在上行线之上,更适合用Herschel-Bulkley方程来描述它的流变行为。甘薯淀粉糊的动态流变行为则表现为在将开始糊化时,储能模量G’、损耗模量G"和tanδ都急剧上升,在到达糊化顶峰时急剧下降,而在降温过程中G’和G"都呈上升趋势,tanδ则是在100~50℃时下降,50~20℃时上升。 相似文献
18.
19.
Felycia Edi Soetaredjo Suryadi Ismadji Lien Huong Huynh Novy S. Kasim Ngoc Yen Tran‐Thi Aning Ayucitra Yi‐Hsu Ju 《Starch - St?rke》2012,64(8):590-597
A facile solvent‐free method to acetylate sago starch (Metroxylon sagu) is reported. Microwave (100 W) was used as the heating source and the heating time was varied from 2 to 10 min with the temperature of acetylation maintained at 100°C under continuous stirring. Using a 24 full factorial design of experiment, it was found that the degree of substitution (DS) of acetylated sago starch was strongly affected by the ratio of starch to acylating reagents, the ratio of acetic anhydride to acetic acid as the acylating reagents, the concentration of iodine as catalyst and reaction time. The physicochemical characteristics of the acetylated sago starch were assessed based on the FTIR spectra, the XRD spectra, the water absorption index (WAI), and the water solubility index (WSI). SEM was used to study the surface morphology of the acetylated sago starch at different DS. 相似文献
20.
Marjan Javanmard Nyuk Ling Chin Seyed Hamed Mirhosseini Johari Endan 《International Journal of Food Science & Technology》2012,47(9):1808-1818
A series of mango jams were prepared using different hydrocolloid solutions (high methoxyl pectin (HMP), carboxymethyl cellulose (CMC), and sago starch) as gelling agents to investigate the effect of hydrocolloid type, hydrocolloid concentration, and freeze‐thaw treatment on the physicochemical, optical, textural, and sensory characteristics. The optical properties results revealed that the total colour change (ΔE) of the sago starch‐based mango jam samples displayed higher values in comparison with samples prepared with HMP and CMC. The textural parameters (hardness, work of shear, stickiness, and work of adhesion) increased with hydrocolloid concentration but decreased with the freeze‐thaw treatment except for sago starch‐based mango jams. The overall acceptability of mango jams containing 6% sago starch was rated similarly to the samples prepared with 0.7% HMP and 0.5% CMC. Principle component analysis revealed that it could be used as an effective tool to segregate characteristics related to fruit jam manufacture. 相似文献