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This study examined the steady flow and dynamic rheological behaviors of hydroxypropylated sweet potato starch (HPSPS) pastes mixed with guar gum (GG), locust bean gum (LBG), and xanthan gum (XG) at different concentrations (0, 0.3, and 0.6%). The HPSPS–gum mixtures had higher shear‐thinning fluid characteristics than the control (0% gum) at 25°C. The addition of the gums resulted in an increase in the consistency index (K) and apparent viscosity (ηa,100). The dynamic moduli (G′, G″) and complex viscosity (η*) values of the HPSPS–gum mixtures were higher than those of the control, and they increased with an increase in gum concentration. In particular, the presence of XG at 0.6% in the HPSPS–gum mixture systems gave rise to the greatest viscoelastic properties among the gums examined at different concentrations. The tan δ (ratio of G″/G′) values (0.35–0.57) of the HPSPS–GG and HPSPS–XG mixtures were much lower than those of the control (0.82) and HPSPS–LBG (0.88–1.06), indicating that the elastic properties in the HPSPS–gum mixture systems were strongly affected by the additions of GG and XG. These steady flow and dynamic rheological parameters indicated there were synergistic interactions between the HPSPS and gums. The synergistic effects of the gums and modified starch were hypothesized by considering the molecular incompatibility and molecular interactions between the gums and HPSPS. 相似文献
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Sweet potato starches (SPS) were hydroxypropylated to evaluate the effect of molar substitution (MS, 0.042-0.153) on the rheological properties, thermal properties, freeze-thaw stability, paste clarity, and gel strength of hydroxypropylated sweet potato starches (HPSPS). The swelling power and solubility values of HPSPS were higher than those of native sweet potato starch (SPS) and increased with an increase in MS. The transition temperatures (To, Tp, and Tc), and enthalpy (ΔH) of gelatinization of HPSPS were lower than those of native SPS, and significantly decreased with an increase in MS.Rheological properties of HPSPS pastes were measured under the conditions of steady and dynamic shear. Their consistency index (K), apparent viscosity (ηa,100), Casson yield stress (σoc), complex viscosity (η*), and dynamic moduli (G′ and G″) values decreased with an increase in MS, while their flow behavior index (n) and tan δ (ratio of G″/G′) values increased. The dependence of apparent viscosity on temperature followed the Arrhenius model for all samples. The paste clarity of HPSPS paste was more pronounced with increasing MS of hydroxypropyl groups. The HPSPS gels showed lower gel strength and also better freeze-thaw stability with a significant decrease in syneresis (g/100 g) compared to native SPS. 相似文献
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S J Tian J E Rickard J M V Blanshard 《Journal of the science of food and agriculture》1991,57(4):459-491
Tropical root crops, of which the sweet potato is an important representative, constitute an under exploited resource of developing countries. They can be used as food for both human and animal consumption and their starch is a source of industrial raw material. This review will consider recent reports on sweet potatoes, the physicochemical properties of their starches in comparison with other starches, and the possible causes of variation in these characteristics. 相似文献
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Wajira S. Ratnayake 《LWT》2008,41(2):346-358
The thermal behaviors of three chemically modified starches (cross-linked waxy corn, hydroxypropylated regular corn, and hydroxypropylated and oxidized waxy corn) were studied using light microscopy, SEM, DSC, XRD, and HPSEC. During the gelatinization process, molecular and crystalline order losses occurred independently from each other. Oxidation treatment altered the effects of hydroxypropylation on starch gelatinization. Both cross-linking and hydroxypropylation tended to preserve granular crystalline order during initial stages of gelatinization. The crystallinities and X-ray patterns of each starch remained essentially unchanged prior to phase transition. 相似文献
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甘薯淀粉磷酸单酯的性能及对蛋糕品质影响的研究 总被引:4,自引:0,他引:4
对甘薯淀粉磷酸单酯的特性研究表明:甘薯淀粉经酯化后,粘度、持水性、持气泡性和糊的透明度都增大,糊化温度降低,冻融稳定性明显增强。将甘薯淀粉磷酸单酯应用于蛋糕生产中,可明显地改善蛋糕的品质。 相似文献
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采用氧化交联对甘薯淀粉进行改性处理,提高了淀粉的白度,改善了淀粉糊的稳定性和抗老化性,并对改性淀粉的结构进行表征。研究结果表明:淀粉变性后,淀粉糊冻融稳定性提高,凝沉性减弱,抗老化性能较强;变性淀粉粘度变化较小,且具有较好的耐酸性能,但是耐碱性较差;具有很好的抗剪切性;抗酶解性能增强。氧化交联乙酰化己二酸双淀粉酯在1729cm-1处产生了新的吸收峰,并确定该吸收峰为酯羰基的伸缩振动峰。利用扫描电镜和X射线衍射分析,表明甘薯淀粉的改性没有改变其晶体结构,交联反应基本发生在淀粉颗粒的无定形区。 相似文献
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介绍了6TF-30型薯类通心粉丝机的结构特点,确定了其主要参数,对粉丝机头模具设计进行了分析,最后给出了性能测试结果和整机参数。 相似文献
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Antimicrobial biodegradable films have been prepared with sweet potato starch by incorporating potassium sorbate or chitosan. Films incorporated with potassium sorbate ≥ 15% or chitosan ≥ 5% were found to have an anti-Escherichia coli effect. Staphylococcus aureus could be effectively suppressed by incorporation of chitosan at ≥10%. Whereas potassium sorbate lowers the tensile strength and elongation at break, and raises the oxygen permeability, water vapor permeability and water solubility, chitosan has the opposite effect. Fourier Transform Infrared (FT-IR) spectra analysis revealed that starch crystallinity was retarded by potassium sorbate incorporation and that hydrogen bonds were formed between chitosan and starch. This explained the modification of the mechanical and physical properties of the films by the incorporation of these two antimicrobial agents. 相似文献
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根据膨胀度、糊化度及差示扫描量热仪(DSC)测得热力学参数,综合分析甘薯交联抗性淀粉和原淀粉热力学性质,并采用Jenkins提出In–vitro模型测定淀粉体外消化性。结果表明:在同一温度下,甘薯交联抗性淀粉膨胀度和糊化度均较原淀粉低,且交联剂用量越高,淀粉膨胀度和糊化度越小;DSC测试结果显示,甘薯交联抗性淀粉相转变温度To、Tp、Tc随交联剂用量增加而升高,Tc–To和△H均比原淀粉低。In–vitro消化模拟实验表明,甘薯交联抗性淀粉消化性比原淀粉低,并随交联剂含量增加,消化产物量减少,消化速度降低。 相似文献
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以三偏磷酸钠(STMP)为交联剂,醋酸酐为酯化剂,对甘薯淀粉进行复合变性,通过一步和二步改性法制备交联酯化改性甘薯淀粉。比较了一步和二步改性法对交联酯化甘薯淀粉性质的影响。一步法指甘薯淀粉交联后调整酯化的条件,省去水洗、中和与干燥操作工序连续进行酯化;二步法为将制备的交联淀粉粉碎干燥后作为酯化变性反应的原淀粉。以峰值粘度和稳定性为指标测定。结果表明:一步法改性的交联酯化甘薯淀粉具有更好的峰值粘度和稳定性;二步法改性的交联酯化甘薯淀粉具有更好的抗凝沉性,溶解度和膨胀度略高于一步法,抗冻融性更好,但与一步法差别不显著。 相似文献
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Jung‐Ah Han 《Starch - St?rke》2010,62(5):257-261
To examine the effect of starch protein on hydroxypropylation, corn (normal and waxy) and potato starches were hydroxypropylated with propylene oxide at two levels (8.3 and 12.3% based on dry basis of starch weight) before or after proteinase (thermolysin) treatment, and then pasting properties of the starches were measured. For normal corn starch, protein appeared to be involved in hydroxypropylation, especially at the higher concentration of reagent (12.3%); the starch hydroxypropylated after proteinase treatment (Enz‐HP) showed less reaction efficiency than that only hydroxypropylated (HP) or proteinase treated starch after hydroxypropylation (HP‐Enz). This suggests a possible reaction between some of the reagent and the starch proteins that exist in the channel and surface of the starch granules. However, not much difference was found with the waxy corn starch, as it contains much lower amounts of amylose and protein than normal corn starch. The potato starch, which has no channels, showed complicated protein effects. For potato starch, a different access of the enzyme and chemical reagents to the granule matrix could be possible. 相似文献
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Physicochemical characterization of sweet potato starches popularly used in Chinese starch industry 总被引:4,自引:0,他引:4
Physicochemical properties of starches isolated from 11 sweet potato cultivars popularly used in Chinese starch industry were studied. Moisture, protein, ash, lipid and phosphorus content of the starches varied from 3.86 to 6.52%, 0.28 to 0.75%, 0.10 to 0.47% and 0.00 to 0.02%, respectively. Amylose content varied between 13.33 and 26.83%. The starches differed in their mean granule sizes, particle size distribution, and susceptibility to pancreatin hydrolysis. Swelling power and solubility ranged from 13.46 to 26.13 g/g and 8.56 to 18.77%, respectively. Higher retrogradation tendency was observed in pastes of starches of high amylose content. Gelatinization temperature and enthalpy ranged from 55.54 to 69.11 °C and 6.40 to 11.89 J/g, respectively. Pasting properties including peak viscosity (134–255 BU), breakdown viscosity (91–162 BU), setback viscosity (26–112 BU), peak time (5.97–7.03 min) and pasting temperature (67.20–73.00 °C) varied significantly among the sweet potato starches. Pearson's correlation analysis showed that phosphorus content of the starches had substantial effect on their swelling power (r = 0.70, p ≤ 0.05) showing positive correlations. There was significant positive correlation between swelling power and solubility of the starches (r = 0.64, p ≤ 0.05). Thermal and pasting parameters also showed significant correlations. 相似文献
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将不同浓度交联剂(6%,8%,10%,12%,14%)制备得到的交联马铃薯淀粉(Cross-linked potato starch,CLPS)应用于甘薯浊汁饮料中,测定浊汁饮料的浑浊度、流变特性、稳定性、Zeta电位和离心沉淀率。结果显示,随着交联程度的增加,浊汁饮料的浑浊度上升,但30d内浑浊度的变化程度降低,饮料体系的假塑性、黏度、黏弹性、凝胶强度与Zeta电位绝对值随着交联程度的增加而增加,在交联剂浓度为12%时取得最大值;交联淀粉能够抑制浊汁饮料底部出现沉淀,但对浊汁饮料顶部析水的控制有限,稳定性动力学指数与离心沉淀率随着交联程度的提高而下降,表明交联淀粉能够提高甘薯浊汁饮料体系的稳定性。综合结果表明,交联淀粉使甘薯浊汁饮料的稳定性有一定程度的提高,12%CLPS可作为稳定剂应用于淀粉质浊汁饮料中。 相似文献
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Sweet potato starches were modified with three different concentrations of phosphorus oxychloride (POCl3) (0.01, 0.02, and 0.03%, based on dry weight of starch) as a cross‐linking agent. The effects of crosslinking on rheological and thermal properties of sweet potato starch (SPS) pastes were evaluated. Cross‐linking considerably reduced the swelling power, consistency index (K), apparent viscosity (ηa), and yield stress (σoc) values of SPS, which significantly decreased with increase in POCl3 concentration. The gelatinization temperature (Tp) and enthalpy (ΔH) values of the cross‐linked SPS, which were determined using differential scanning calorimetry, were higher than those of native SPS. Storage modulus (G′), loss modulus (G″), and complex viscosity (η*) of the cross‐linked SPS pastes determined using small deformation oscillatory rheometry, were higher than native starch, and they also decreased with increase in POCl3 concentration from 0.01 to 0.03%. The tan δ (ratio of G″/G′) values (0.15–0.19) of the cross‐linked SPS samples were much lower than that (0.37) of the native SPS, indicating that the elastic properties of the SPS pastes were strongly influenced by modifications from cross‐linking. Finally, Cox–Merz plots showed that η* was much higher than ηa for the cross‐linked SPS pastes. 相似文献