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荞麦苗营养成份及汁发酵工艺初步研究 总被引:3,自引:0,他引:3
分析了甜荞苗的营养成份,结果表明,荞麦苗含有丰富的营养成份,特别是富含黄酮类化合物,是一种营养保健食品的新资源。对荞麦苗的取汁工艺及荞麦汁发酵进行了初步研究,荞麦汁发酵乳中维生素含量高于普通酸奶,含有酸奶缺乏的黄酮类化合物。 相似文献
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《食品工业》2014,(11)
确定荞麦苗中抗氧化物质提取的最佳乙醇体积分数,并对荞麦萌发过程中抗氧化活性的变化进行评价。用不同浓度的乙醇提取不同萌发时间荞麦苗中的抗氧化成分,通过DPPH自由基清除能力检测其抗氧化活性并计算提取物的IC50值。结果体积分数60%乙醇溶液提取的得率总体较高,最高值为萌发第10天的25.23%,但提取物的抗氧化活性较低;而体积分数40%乙醇的荞麦苗提取物则显示了较高的DPPH自由基清除能力,随着发芽时间的延长抗氧化能力逐步上升,在萌发第6天的时后到达最高值79.80%,为第3天的1.4倍;综合考虑提取得率与提取物的DPPH自由基清除率,发现在萌发第9天时荞麦苗的抗氧化能力最强。乙醇体积分数对荞麦苗提取物抗氧化能力的变化有一定影响,主要抗氧化物质集中在体积分数40%乙醇中,荞麦萌发过程中抗氧化活性呈增加趋势,第9天时最高。 相似文献
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荞麦和荞麦挂面的制作傅晓如荞麦,又名三角麦,是一种营养丰富的杂粮,在我省广大农村有种植,但由于荞麦忌连作,产量较低,大多数荞麦都是农民自给自足,一直未能开发利用。随着人们生活水平的提高,荞麦以其风味独特、未受污染、营养价值高、具有一定的保健食疗作用,... 相似文献
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为提高荞麦蛋白营养与氨基酸的综合利用价值,采用3种熟化方式处理甜荞,在测定熟化前后荞麦蛋白等电点及电泳分析的基础上,采用考马斯亮蓝法对熟化前后荞麦蛋白进行分析,采用茚三酮柱后衍生离子交换色谱仪法对氨基酸组成进行营养价值评价。结果表明,未加工荞麦蛋白质量分数为12.30%,蒸制后荞麦蛋白质量分数为11.5%,炒制后荞麦蛋白质量分数9.70%,煮制后荞麦蛋白质量分数最高,为14.80%。不同熟化方式的氨基酸总量差异不大,3种熟化方式中均含有人体必需的7种氨基酸,炒制后氨基酸的总量最高,为10.30 g/100 g,煮制后最低,含量为9.43 g/100 g;蒸制、炒制后除Tyr外,剩余氨基酸含量均升高;煮制后,Thr、Ser、Gly、Ala及Lle含量均没有发生变化,Val、Met、Tyr、Lys、His、及Arg含量均降低。熟化方式对荞麦蛋白及氨基酸含量影响的研究可为荞麦应用提供理论基础。 相似文献
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为提高苦荞麦的利用价值和苦荞面条的食用品质,利用超微粉碎技术制备超微苦荞麦粉,考察超微粉碎和超微粉粒径对苦荞麦粉的粉质特性及其面条品质特性的影响。结果表明,随着粒径的减小,苦荞麦粉的破损淀粉质量分数显著增加(P<0.05),面粉亮度值由72.20升高至77.48。同时,随着粒径的减小,苦荞麦粉的峰值黏度、谷值黏度和最终黏度均显著上升(P<0.05)。超微粉碎技术的应用提升了苦荞麦粉的整体糊化特性,使得面团能够更快成型,稳定时间延长,面团的黏弹性增强,内部网络结构愈发均匀致密。利用超微粉制作全苦荞麦面条,断条率显著下降(P<0.05),最佳蒸煮时间和蒸煮损失最多减少约50%,质构特性显著改善。 相似文献
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研究普通荞麦壳、粉、麸皮中主要挥发性成分,通过固相微萃取(SPME)结合气质联用仪(GC-MS)对挥发性成分进行分离和鉴定,通过计算相对气味活度值(ROAV)确定对主体风味贡献较大的成分。结果表明,从普通荞麦中共鉴定出67种挥发性成分,对荞麦特殊风味起主要作用的分别是壬醛、癸醛、正己醛、2-正戊基呋喃和β-环柠檬醛。其中,从荞麦壳、粉、麸皮中分别鉴定出26,28和34种挥发性成分,其中包括醛类、酮类、醇类、烷烃及酚类等。荞麦不同部位挥发性成分及风味不尽相同,荞麦壳和麸皮中含有更多的醛类成分。因为醛类阈值较低,对风味影响较大,故荞麦壳和麸皮气味更加浓郁,荞麦面粉风味则相对较淡薄。 相似文献
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为明确挤压荞麦对混合粉面团特性和面条品质的影响,系统研究了挤压荞麦添加对混合粉溶剂保持力(solvent retention capacity,SRC)、糊化特性、热机械特性、面条蒸煮特性和质构特性等的影响。结果表明,蔗糖、碳酸钠和乳酸的SRC随挤压荞麦粉添加量的增加而显著增加(P<0.05)。混合粉的峰值粘度、谷值粘度、衰减值、最终粘度和回生值均随着荞麦粉添加量的增加而显著降低(P<0.05)。面团的吸水率、弱化度C1-C2随挤压荞麦粉添加量的增加而显著增加(P<0.05)。然而,糊化特性C3-C2值和回生值C5-C4、形成时间和稳定时间都随挤压荞麦添加量的增加而减小。随挤压荞麦粉添加量的增加,面条的蒸煮吸水率减小,剪切力、拉伸强度、硬度和咀嚼性等增加。 相似文献
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Mixolab, as the rheological instrument, was utilized to create gluten-free products. According to obtained Mixolab profiles, mixtures of rice flour and husked buckwheat and rice flour and unhusked buckwheat flour expressed rheological properties similar to wheat flour. In both types of mixtures the ratio of rice flour to buckwheat flour was 90:10, 80:20 and 70:30. According to the Mixolab profiles of the investigated systems, gluten-free products containing unhusked buckwheat flour had higher water absorption values, lower stability and weaker protein network structure, as well as lower peak viscosity than those consisted of husked buckwheat flour.Increasing the amount of husked buckwheat flour from 10% to 20% resulted in both G′ and yield stress value increase, but further increase of the husked buckwheat flour on 30% resulted in both G′ and yield stress value decrease. However, increasing the amount of unhusked buckwheat flour from 10% to 20% resulted in significant decrease of G′ and yield stress value having no significant impact with the addition of 30% of unhusked buckwheat flour.Hardness, expressed as a work of compression of the final product, increased with the amount of both types of buckwheat flour. Samples containing UBF expressed not significantly higher values of hardness than those prepared with HBF. According to obtained results of sensory evaluation of the final products it can be concluded that all six combinations of tested gluten-free breads were sensory acceptable. 相似文献
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该文对苦荞小麦混合粉粉质特性、拉伸特性进行系统研究。随着苦荞粉比例增加,形成时间、稳定时间缩短,弱化度上升,评价值下降,拉伸参数均呈下降趋势;且苦荞粉比例越大,下降幅度越大。另外,面包烘焙实验表明,苦荞添加量为10%和20%时,苦荞面包尚有较好烘焙特性,添加量增至30%时,烘焙特性显著下降,添加量达40%或50%时,烘焙特性极差。 相似文献
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Protein fractions were extracted by successive extraction and analysis method in four buckwheat varieties including Japanese spring buckwheat, Japanese summer buckwheat, Yuqiao No. 1 and Yuqiao 6-21. The amino acid and the mineral content of each protein fraction were also analyzed in this paper. The basis for the data on the experiment was the relationship between protein fractions and amino acids, and the mineral contents of protein fractions. The distribution and proportion of amino acids and the minerals in each protein fraction in the buckwheat kernel as well as the nutritional value of buckwheat kernel were discussed. The results showed that there is a high amount of soluble protein and very low amount of prolamin in the buckwheat kernel. Leucine is the first limited amino acid in buckwheat, and buckwheat protein is only a seminutritional protein. The buckwheat kernel is rich in K, Zn in the albumin, Ca, Mg and Mn in the globulin, Na in the prolamin and glutelin. 相似文献