结冷胶溶液凝胶特性的研究

结冷胶是一种新型食品添加剂。其存在形式为天然式和低酰基式。天然式结冷胶溶液的凝胶特性是粘弹性体,低酰基结冷胶溶液是凝胶体。将两种形式的结冷胶溶液在相同条件下与卡拉胶、琼脂溶液进行了比较,得出两种形式的结冷胶溶液在0.05％时可形成凝胶,大大低于卡拉胶和琼脂的成凝胶浓度。     

结冷胶的特性及其在食品工业中的应用

结冷胶是一种阴离子微生物多糖,具有凝胶形成能力强、透明度高、耐酸耐热性能好等优良特性。在食品加工业中,结冷胶不仅可以作为一种优良的胶凝剂使用,而且能够赋予食品令人愉悦的质地和口感;此外,结冷胶还可与其他食品胶配合使用,广泛应用于面点、糖果、调味品等多种食品加工中,使得食品能够获得最佳的感官、质构和稳定性要求。     

结冷胶的成胶特性及应用研究进展

本文综述了结冷胶的凝胶特性，凝胶机制和流变学特性，对结冷胶的凝胶原理、显微结构也进行了阐述。并介绍了结冷胶复配体系的特点及其应用前景。     

高酰基结冷胶凝胶特性的研究

研究了高酰基结冷胶溶液的凝胶特性并对其凝胶机理进行了分析,通过对高酰基结冷胶在不同浓度、温度、pH值和Ca2+盐条件下流变特性和凝胶强度的实验研究,结果表明:胶体浓度、温度、游离的二价阳离子含量以及pH值的差异都会对高酰基结冷胶的粘度和凝胶强度产生影响。对高酰基结冷胶作用力的初步考察结果表明:疏水作用、氢键作用、静电作用在形成凝胶的过程中均起关键作用,疏水作用影响最大。     

银耳多糖与结冷胶复配体系的流变及凝胶特性

对不同质量浓度的银耳多糖溶液、结冷胶溶液（均为0.4、0.8、1.2、1.6、2.0 g/100 mL）及不同质量比（1.6∶0.4、1.2∶0.8、0.8∶1.2、0.4∶1.6）的银耳多糖/结冷胶复配体系的流变和凝胶特性进行研究,初步探讨其相互作用机理。结果表明,随着银耳多糖质量比的提高,复配体系的表观黏度和动态黏弹性增加,储能模量（G’）和损耗模量（G”）增加。复配体系的触变环随银耳多糖质量比例的增加而减小,说明银耳多糖可以改善复配体系的触变性。质构分析和持水性测试结果表明,结冷胶是银耳多糖/结冷胶复配凝胶强度和硬度的决定性因素,银耳多糖可以明显提高复配体系的弹性、黏性和持水性。基于傅里叶变换红外光谱和低温扫描电子显微镜分析,初步判断在复配体系中银耳多糖与结冷胶之间存在相互作用,形成了凝胶网络结构。     

质构仪穿透法测定结冷胶凝胶特性

建立了质构仪测定结冷胶凝胶特性的方法,表征了与凝胶特性相关的各参数。研究了钙离子浓度对凝胶强度、硬度、弹性、坚实性及黏稠性的影响。试验证明,该方法具有较好的重复性与再现性,测量精密度高,相对标准偏差均小于10%,对原料的验收与质量控制具有重要意义。     

高酰基结冷胶特性及应用研究进展

目的:介绍新型微生物多糖-高酰基结冷胶的研究进展和前景.方法查阅近年来国内外的相关文献报道,并进行分析、整理和归纳.结果 胶体浓度、外加金属阳离子类型和含量、pH值、糖份都会对凝胶特性和流变性产生影响. 结论 高酰基结冷胶作为一种新型凝胶剂,只有在充分理解掌握其凝胶特性的基础上才能获得理想的效果.     

结冷胶的特性及其在食品工业中的应用

本综合论述了微生物多糖-结冷胶的组成、结构、制备、性质和在食品工业中的应用现状，并对其作为微多糖类食品添加剂今后在我国的发展前景进行了分析和预测。     

低酰基结冷胶酸性凝胶的凝胶特性

以葡萄糖酸-δ-内酯(glucono-δ-lactone,GDL)作为酸诱导剂,制备低酰基结冷胶(low acyl gellan gum,LA)酸性凝胶,考察基体质量浓度、GDL/LA复配比例以及酸液浸泡对酸性凝胶凝胶特性的影响。研究结果表明,GDL酸化为缓慢酸化,GDL/LA复配比例越高、体系的pH值越低,酸化速率越快。基体质量浓度和GDL/LA复配比例对酸性凝胶结构影响显著,断裂应力和保水性随着GDL/LA复配比例的增大先升高后降低。基体质量浓度越高,断裂应力和不透明性越大。GDL/LA复配比例增大,断裂应变减小,不透明性增大。当酸液pH值为1时,酸液浸泡对GDL/LA复配比例为2∶1和4∶1的酸性凝胶强度无影响,但GDL/LA复配比例为1∶4、1∶2和1∶1时,凝胶强度随浸泡时间的增加而增强,酸液浸泡可以促使酸性凝胶进行结构重建。     

结冷胶及其在食品工业中的应用

结冷胶是一种微生物胞外多糖。文中主要介绍了结冷胶的组成、基本特性、制备及其在食品工业中的应用。     

食品胶特性及其在食品中应用

食品胶是一类高分子量亲水性生物聚合物,作为功能性组分被广泛应用于食品工业,目前其系统介绍、技术应用和学术研究仍十分匮乏。文章系统介绍食品胶定义、分类、组成、功能特性与作用机理及其在食品工业中应用,并展望其发展趋势,为进一步研发食品胶在食品中的应用提供理论参考。     

Texture and structure of high-pressure-frozen gellan gum gel

To determine the effects of sucrose and high-pressure-freezing, unsubstituted form-gellan gum gels with 0, 5, 10 or 20% sucrose were frozen at 0.1–686 MPa and −20 °C. Gels were frozen during pressurization at 0.1, 100, 600–686 MPa. However, at 200–500 MPa, gels did not freeze but froze during pressure release (pressure-shift-freezing). On pressure release, a sharp rise in sample temperature was observed for the samples between 200 and 500 MPa. This was a consequence of the exothermic freezing event. Thus, appearance and structure of gels frozen at 200–500 MPa were better than other treated samples due to quick freezing. However, when gels were frozen at 0.1–686 MPa, rupture stress decreased remarkably and strain increased. Texture of pressure-shift-frozen gel was somewhat better than that of gels frozen in freezers (−20, −30 or −80 °C) at atmospheric pressure. Consequently pressure-shift-freezing was more effective. It was found that the addition of sucrose to gels was effective in improving the quality of frozen gellan gum gels.     

结冷胶生产技术及其在食品中应用

该文综述结冷胶组成、结构及特性,发酵法生产技术及其在食品中应用,并介绍结冷胶局限性。     

Effect of temperature on the dielectric properties of low acyl gellan gel

Gellan gum is an increasingly popular and a naturally occurring hydrocolloid. It is widely used in the food, chemical, and pharmaceutical industries as a stabilizer, emulsifier, thickener, and gelling agent. The gel is also used as a model material to study microwave heating dynamics of biological materials in the food processing industry. In this study, baseline data on dielectric properties of 1% gellan gel containing 0.17% and 0.3% CaCl₂ were collected at frequencies between 0.2 and 20 GHz and temperatures between 10 and 100 °C. These data are compared with those of distilled water containing similar ionic concentrations. Models describing the behavior of the dielectric constant, loss factor, loss tangent and the penetration depth for 0.2–3.2 GHz were developed. These models can be effectively used in microwave food processing applications of gellan gel, which will save considerable time and effort often used in empirically determining the dielectric spectra.     

离子对结冷胶凝胶温度及强度的影响

主要研究了不同浓度的钙、镁、钾、钠离子对结冷胶凝胶温度及强度的影响;不同浓度的结冷胶与离子对凝胶强度的影响;当钙、镁、钾、钠离子含量一定时,不同浓度的结冷胶对凝胶温度及强度的影响;钙离子和钾、钠离子对结冷胶凝胶是否有协同作用。结果表明,随着离子浓度的增加,凝胶温度先升高后降低,凝胶强度先增大后减小,在离子含量很少或很多时,结冷胶的凝胶温度和强度都很低。凝胶强度和温度随着结冷胶浓度的增加而增加。钙离子和钾、钠离子在促进结冷胶凝胶上无协同作用。     

Interactions between milk proteins and gellan gum in acidified gels

The mechanical properties, microstructure and water holding capacity of systems formed from whey protein concentrate (0–3% WPC w/w), sodium caseinate (0–2% w/w), and gellan gum (0.1–0.3% w/w) in the coil or helix conformational state (Coil/Helix), were investigated. This polymer combination resulted in bi-polymeric or tri-polymeric systems, which were slowly acidified to pH 4.0 by the addition of GDL in order to favor electrostatic protein–polysaccharide interactions. The properties of the tri-polymeric systems differed considerably from the bi-polymeric ones. At high polymer concentrations the WPC-gellan samples showed incompatibility and microphase separation, which resulted in weaker and less deformable gels. However, in systems with coil gellan the incompatibility was less intense, which was attributed to the formation of electrostatic complexes between the protein and the polysaccharide during the mixing process. In caseinate–gellan systems, complex formation was observed and an increase in the gel mechanical properties as the caseinate concentration rose, although the water holding capacity decreased at higher gellan concentrations. The caseinate–gellan coacervate was not visualized in the tri-polymeric systems and the incompatibility between the biopolymers was intensified, although the mechanical properties were considerably higher than in the bi-polymeric gels.     

亚麻籽胶功能性质及其在食品中的应用进展

亚麻籽胶作为新型的天然功能性胶体,是主要存在于亚麻籽壳表面的一种阴离子杂多糖,具有凝胶、乳化、增稠等特性,被当作一种绿色添加剂广泛应用于食品加工中,以提高产品品质.同时作为一类水溶性膳食纤维,亚麻籽胶还具备减轻体重、调节肠道菌群、降低血糖及胆固醇等生理功能,故其在食品中不仅作为稳定剂、乳化剂、增稠剂等角色,也兼具营养功...     

阿拉伯胶在食品工业中的应用

本文综述了阿拉伯胶的组成、结构、制备、性质和目前其在食品工业中的应用现状，并对其作为多糖类食品添加剂在我国的发展前景进行了分析。     

黄原胶的生物合成及其在食品工业中的应用进展

介绍了黄原胶的分子结构和其功能特性,阐述了黄原胶的生物合成进展及黄原胶在现代食品工业中的应用,探讨了黄原胶在我国食品工业应用中面临的问题与发展途径。