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1.
利用顶空固相微萃取(HS-SPME)结合气相色谱-质谱联用仪(GC-MS)分析鱼腥草浸泡酒中香味成分以及紫外分光光度计(uv)测定其多酚含量及1,1-二苯基-2-三硝基苯肼(DPPH)自由基清除能力。结果表明,主要香味成分为羧酸及羧酸酯、醇类、萜类以及醛酮类物质,其中己酸乙酯占检出成分的66.94%,丁酸乙酯(6.55%),月桂烯(4.51%),戊酸乙酯(2.00%),并检测出药理学活性的甲基正壬酮和乙酰龙脑等物质;多酚含量为1.92mg/mL,自由基清除率为62.00%。结果表明,因鱼腥草有较独特的化学以及丰富的营养成分,使得鱼腥草浸泡酒具有较丰富的营养及药理成分物质,具有一定的保健功能。 相似文献
2.
研究了黑比诺、美乐和赤霞珠在浸渍发酵及贮存后花色素的变化规律,结果表明,花色素在浸渍过程中先升高,然后降低,在浸渍的3-4d,且比重低于1.025时可达到最大值,贮存后,花色素的含量明显降低,但随着浸渍时间的处长所表现的变化规律保持不变。 相似文献
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介绍了一种简单实用的汽轮机不开缸除钠盐方法——灌水泡洗法,该方法在平顶山天源盐化有限责任公司1^#、2^#汽轮机应用获得了成功,并取得良好的效果。 相似文献
5.
主要对在真空的条件下用液蜡作浸溃液、做木块被浸溃物的真空浸溃实验过程作了详细的介绍,分别介绍实验前的准备,实验中的现象及注意事项,试验结论等。然后说明在真空条件下的浸渍质量优于常规浸渍的质量,并得到一些浸渍质量与真空度和浸渍时间的定量关系,从而给出研究高质量浸渍结果的实验方法。 相似文献
6.
以灵芝子实体超细粉为原料,用不同体积分数的乙醇溶液浸提,对灵芝酒浸提过程中主要功能成分的变化规律及其抗氧化作用进行了研究。结果表明:灵芝酒中总皂苷、总多糖和总蛋白质3种主要活性成分的质量浓度均随浸提时间的延长而增加,其中总皂苷、总多糖的质量浓度在第35天左右达到峰值,之后略有下降,总蛋白质质量浓度在第30天左右达到峰值,之后开始降低;灵芝酒的DPPH自由基清除率和ABTS自由基清除率在第35天左右达到最大值,其抗氧化能力与总皂苷质量浓度、总多糖质量浓度和总蛋白质质量浓度均呈正相关;浸提用酒度数不同,制得灵芝酒的活性成分质量浓度不同,其抗氧化能力也不同,其中70°酒能较好地提取灵芝中3种主要活性成分,制得灵芝酒的抗氧化能力最强。因此,70°酒最适宜用来浸提灵芝酒,最佳浸提时间为35 d左右。 相似文献
7.
In many instances brewhouse performance cannot be predicted from a finished malt specification. This is particularly so for factors such as lautering, yeast performance, filtration and head character. There are two aspects involved in improving the brewing performance of malt. Firstly, an understanding of the malt characteristics affecting particular aspects of the brewing process and secondly an understanding of how the malting process affects or can be controlled to optimise these characteristics and thus their performance. In this work the relationship between barley variety, steeping pattern, malt quality and brewing performance is investigated. Six different barley varieties were micromalted in a Seeger micromalting unit under four different steeping regimes. Sub-samples were taken at intervals during steeping for enzyme analysis and measurement of water distribution. Following steeping, the samples were germinated and kilned using standard micromalting conditions. Finished malts were analysed by standard EBC methods for routine malt quality parameters including apparent attenuation limit. Worts were tested for total β-glucan content, β-glucan molecular weight distribution, filter plugging potential and carbohydrate levels. A sub set of malt samples were then micro-brewed and tested for β-glucan molecular weight (MW) distribution, beer filterability and foam stability. 相似文献
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9.
H.H. Wijngaard H.M. Ulmer M. Neumann E.K. Arendt 《Journal of the Institute of Brewing》2005,111(3):275-281
To determine the effect of steeping time on final buckwheat malt quality, buckwheat was steeped for three different times resulting in three different out‐of‐steep moisture contents: 7 h steeping (35%), 13 h steeping (40%) and 80 h steeping (45%). An increased steeping time increased malting losses, total beta‐amylase activity and Kolbach index. On the contrary total nitrogen, friability and viscosity of consequent congress worts were decreased. A maximum alpha‐amylase activity was found in buckwheat malted with an out‐of‐steep moisture content of 45%. Beta‐amylase existed in a soluble and latent form in buckwheat. The latent form was solubilised during malting. In addition extra beta‐amylase was produced. In general the optimum out‐of‐steep moisture content for buckwheat is between 35 to 40%, which is a compromise between attaining the desired malt quality and minimising malting loss. 相似文献
10.
Following field trials in 2008 and 2010, six lines, derived by mutation in the hull‐less barley cultivar Penthouse, were selected to provide a range in grain β‐glucan content. These lines, along with Penthouse and the hulled, malting variety Optic, were then malted, using four different steeping regimes, with samples kilned after 3, 4 and 5 days of germination. The longest steep regime provided samples with optimum modification after 5 days of germination. Samples from the other steep regimes were under‐modified to varying degrees. In particular, the steeps with a single immersion gave poorly modified samples with low extracts and alcohol yields. One line, with low grain β‐glucan, gave higher alcohol yields than either Penthouse or Optic, following a regime comprising two short immersions and a single air‐rest, but there was no clear association, within the lines, between β‐glucan content and malting properties. Copyright © 2012 The Institute of Brewing & Distilling 相似文献