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淀粉是小红豆的主要成分,其结构和性质对小红豆的加工和小红豆食品的品质有重要的影响。本文研究了小红豆淀粉糊的凝沉性、透明性、黏度曲线以及小红豆淀粉的凝胶性质等特性,为小红豆淀粉食品的开发提供理论基础。 相似文献
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为了研究桔梗皂甙对玉米淀粉糊部分理化特性的影响,在玉米淀粉糊中添加桔梗皂甙,测定添加皂甙后玉米淀粉的颗粒形态、玉米淀粉糊的表观黏度、凝沉特性和淀粉糊形成的凝胶特性.结果表明,随着皂甙添加量的增大,淀粉颗粒变小,淀粉糊的黏度增加,抗凝沉能力增加;桔梗皂甙的添加也对淀粉糊形成的淀粉凝胶特性产生影响,玉米淀粉凝胶的凝胶强度、硬度、弹性、胶着性、咀嚼度及回复力与桔梗皂甙的添加量呈负相关,黏着性与桔梗皂甙的添加量呈正相关.桔梗皂甙可对玉米淀粉性能产生一定的影响. 相似文献
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羧甲基淀粉糊性质的研究 总被引:8,自引:0,他引:8
本文对羧甲基淀粉糊性质进行了详细的研究,包括糊的冷热粘度稳定性、凝沉性、冻融稳定性、透明度、pH值和介质(蔗糖,氯化钠)对糊粘度性质的影响。结果表明,淀粉经过羧甲基化后,糊的热粘度稳定性大为降低,冷粘度稳定性增加;在pH3.5~8.5范围内,有较好的耐酸碱稳定性;10%蔗糖对糊粘度性质影响不明显,添加氯化钠会使糊化温度升高,峰值粘度降低,凝沉性增大;羧甲基淀粉具有易糊化,糊凝沉性低,冻融稳定性好和透明度高的优良性质。 相似文献
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甜味料和亲水胶体对酸改性淀粉凝胶粘度及质构的影响 总被引:1,自引:0,他引:1
本文研究了各种甜味料(蔗糖、淀粉糖浆、山梨糖醇、麦芽糖醇、异麦芽糖醇)和亲水胶体(魔芋胶、琼脂、结冷胶、海藻酸钠、罗望子胶、果胶、阿拉伯胶、卡拉胶)对酸改性淀粉糊的粘度、凝胶体强度、质构的影响.结果表明:相同浓度甜味料和不同浓度(0.1%~0.5%)的胶体对酸改性淀粉协同增粘作用的大小顺序分别为:山梨糖醇>异麦芽糖醇>... 相似文献
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Adewoyin Martin Ogunmolasuyi Evans Chidi Egwim Mary Ayobami Adewoyin Josiah Ekpeno Nkop 《International Journal of Food Properties》2017,20(5):1062-1073
This work was designed to elucidate selected physicochemical, functional, and structural properties of native and modified yam (Dioscorea rotundata) starch. The isolated starch was chemically modified using 5, 10, 15, 20, and 25% phosphoric acid solution at 50°C for 1 h, and yield, swelling power, gelation, water holding capacity, paste clarity, blue value, and amylose and amylopectin content of the native and modified yam starch were determined. Structural changes in the native and starch modified with 25% phosphoric acid were evaluated using Fourier transform infrared spectroscopy and optical microscopy. The result showed that the yield, swelling power, water holding capacity, paste clarity, blue value and amylose and amylopectin content of native yam starch was 33.38% (217 g), 3.84 g/g, 1.0 v/g, 10%, 0.52 and 25.96, respectively, whereas gelation study of the native and modified starch indicated that native starch was viscous and modified starch firm. However, yield, swelling power, water holding capacity, paste clarity, blue value, and amylose content of modified yam starch reduced in a dose dependent manner with phosphoric acid. The reduction in the values of the various functional properties could be associated with the effect of phosphoric acid on the starch granular structure. The result of Fourier transform infrared spectroscopy and optical microscopy revealed that the yam starch was modified by phosphoric acid with changes in functional groups spectra such as –OH stretch (3177 cm?1), H2O absorbed (1644 cm?1) (amorphous region), C-H stretch (2923 cm?1), CH2O (1253 cm?1), and C-O-C (1078 cm?1) when compared to native starch. The morphology of native and modified yam starch granules ranged from oval to eliptical. However, modified starch granules were rough in surface. In conclusion, the characterized physicochemical and functional properties and structure exhibited by native and modified yam starch indicated that, yam could be a cheap and valuable source of starch for industrial application. 相似文献
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为了探究变性淀粉对非发酵面团冻融品质的影响,本研究比较了在添加马铃薯羟丙基二淀粉磷酸酯、木薯醋酸酯淀粉、木薯羟丙基淀粉与马铃薯醋酸酯淀粉后非发酵面团冻融品质的变化。结果表明:变性淀粉未能有效控制冻融面团的失水率,但冻融面团深层结合水相对含量均有所增加,凝胶能力下降,且不受变性淀粉添加量与种类的影响。冻融面团剪切力均随着变性淀粉添加量增加呈现“下降-上升”的趋势,且均低于对照组。变性淀粉添加量较少时基本能较好地改善熟面坯的质构特性,高添加量反而不利于熟面坯的质构特性。添加木薯醋酸酯淀粉不利于面团流变性的改善,而其余3 种变性淀粉在添加量较低(<5%)时,有利于改善面团的流变特性。因此,变性淀粉在添加量较少时对非发酵面团冻融品质有一定的改良作用。 相似文献
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Vanesa Benítez Sara Cantera Yolanda Aguilera Esperanza Mollá Rosa M. Esteban María Felicia Díaz María A. Martín-Cabrejas 《Food research international (Ottawa, Ont.)》2013,50(1):64-69
The objective of this study was to evaluate the impact of germination on dietary fiber composition, starch availability and physicochemical properties in four non-conventional legumes (Vigna unguiculata, Canavalia ensiformis, Stizolobium niveum, Lablab purpureus) in order to improve the carbohydrate supply and to optimize native products of developing countries. Germination promoted a significant decrease of resistant starch along with an increase of available starch percentage. Total dietary fiber contents increased during germination and improved insoluble/soluble dietary fiber ratio. This process produced an increase of total sugar content, mainly due to the rise of cellulosic glucose from metabolic reaction undergone during germination. Moreover, physicochemical properties of germinated legume flours were modified, improving oil holding, water holding, water absorption and gelation capacities, whereas decreases of emulsifying and foaming capacities were detected. In conclusion, germination provides non-conventional legume flours with higher nutritional quality and better physicochemical properties than the raw flours. 相似文献
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Stijn Reyniers Nand Ooms Sara V. Gomand Jan A. Delcour 《Comprehensive Reviews in Food Science and Food Safety》2020,19(5):2588-2612
The use of starch in food systems in many instances relies on its thickening and gelling capacity. When native starches fail to match process and/or product‐specific requirements, starches are physically and/or chemically modified to meet end‐use demands. Evidently, differences between starches of varying botanical origin have to be considered when selecting or modifying starches for particular applications. Potato starch (PS) ranks third in world production after maize and wheat starches. Its unique properties differ from those of cereal and pulse starches and are directly related to its molecular structure and organization. This review summarizes the differences between PS and cereal and pulse starches and how they set it apart in terms of gelatinization, pasting, gelation, and retrogradation. Recent advances in improving PS pasting and gelation using enzyme technology and mineral ions are also described. 相似文献
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Modification of granular corn starch with 4-alpha-glucanotransferase from Thermotoga maritima: effects on structural and physical properties 总被引:1,自引:0,他引:1
ABSTRACT: Corn starch was converted using α-1,4-glucanotransferase from Thermotoga maritima (TmαGT), a hyperthermophilic bacterium, without inducing gelatinization, and the structural changes and physical properties of the modified starches were investigated. Enzyme modification was induced at 65 °C for 8, 16, or 24 h, and the morphology of the modified starches was observed with light and scanning electron microscopy. Granule integrity was mostly maintained after enzyme treatment, although some granules were partially fragmented as evidenced by enlarged surface pores and some cracks. The modified starches had lower apparent amylose levels than raw starch. The molecular weights of amylose and amylopectin molecules in the treated starches were lower than those of raw starch, and the amount of branched molecules, which had much lower molecular weights, also increased in the treated starches. The chain-length distribution of amylopectin showed an increased number of shorter branched chains. The modified starches showed a wider melting temperature range and a lower melting enthalpy than that of raw starch. The X-ray diffraction pattern of the modified starches showed typical A-type starch peaks, but the relative crystallinities were lower than that of raw starch. The solubility and paste clarity of the modified starches were much higher than those of raw starch. The modified starch gels maintained their rigidity over the whole frequency range tested and showed thermoreversibility between 4 and 75 °C. These results suggest that TmαGT can be used to produce granular corn starch, which contains amylose and amylopectin having lower molecular weights and a thermoreversible gelation property. 相似文献
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S. S. DESHPANDE S. K. SATHE P. D. RANGNEKAR D. K. SALUNKHE 《Journal of food science》1982,47(5):1528-1602
Black gram (Phaseolus mungo L.) starch was modified by heat and moisture treatments, acetylation, oxidation, cross-linking, and adding free fatty acids (palmitic, stearic, and linoleic). Heat and low moisture treatment, acetylation, oxidation, and cross-linking lowered the starch gelatinization temperature by 1–6°C, while adding fatty acids and the high moisture-heat treatment raised it by 1–4°C. All modifications caused an increase in least gelation concentration of starch. High moisture-heat treatment increased both water and oil absorption of starch. At 95°C, heat-moisture treated, acetylated, and oxidized starches were more soluble, while fatty acid treated and cross-linked starches were less soluble compared to raw starch. The modified starches had greater swelling capacity and solubility at pH 2.0 and 10.0. Heat-moisture treated and chemically modified starches had lower swelling capacity (at 95°C) than that of isolated starch, whereas addition of fatty acids increased it. 相似文献