共查询到20条相似文献,搜索用时 58 毫秒
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以燕麦为辅料制备麦芽汁,采用正交试验设计研究酶的添加量、添加阶段、作用时间、辅料添加量对麦芽汁品质的影响。结果表明,NSP酶的添加量对麦汁的过滤时间、糖化时间、α-氨基氮含量、还原糖量和收得率均有显著性影响(p〈0.05),NSP酶的添加阶段和燕麦添加量均只对麦汁中仅一氨基氮含量有显著性影响(p〈0.05),而NSP酶的作用时间对测定的理化指标均无显著性影响(p〉0.05)。最佳工艺条件为NSP复合酶添加量为0.24%,燕麦添加量为30%,NSP复合酶在蛋白质休止的第一阶段(45℃)添加,保温23min。 相似文献
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在生产中 ,大麦芽α -氨基氮含量不仅是检查麦芽质量的一个重要指标 ,而且由于它是酵母菌进行新陈代谢的主要氮源 (约占酵母菌需要的可同化性氮的 70 %以上 ) ,所以适量保持α -氨基氮 ,对保证发酵良好 ,降低啤酒中双乙酰的含量有着重要意义。若α -氨基氮含量低 ,就得在蛋白休止过程采取一系列措施 ,从而影响糖化的正常进行 ,并增加糖化的成本。故在麦芽生产中 ,保证麦芽溶解良好 ,适当提高麦芽中α-氨基氮含量 (一般应≥ 16 0mg/ 10 0g无水麦芽 )是很有必要的。为此 ,我们结合生产实际进行如下探讨。1 影响麦芽α -氨基氮含量的作用条… 相似文献
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在生产中,大麦芽α-氨基氮含量不仅是检查麦芽质量的一个重要指标,而且由于它是酵母菌进行新陈代谢的主要氮源(约占酵母菌需要的可同化性氮的70%以上),所以适量保持α-氨基氮,对保证发酵良好,降低啤酒中双乙酰的含量有着重要意义.若α-氨基氮含量低,就得在蛋白休止过程采取一系列措施,从而影响糖化的正常进行,并增加糖化的成本. 相似文献
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当用禾发芽高粱(0-100%)和麦芽(100-0%)并结合工业用酶制剂糖化时对麦汁质量的影响进行了评价,糖化过程温度为50℃、95℃和60℃,评价不同酶的使用,稳定的α-淀粉酶对高效率糖化是必要的,高粱含量高的糖化醪须有一个真菌α-淀粉酶相对于100%麦芽糖化醪以起到提高过滤速率的作用,细菌蛋白酶的添加可增加可溶性氮的数量和肽的降解、谷粉中添加相对比例的高梁可能导致麦汁滤速、色度、粘度、发酵极限、游离氨基氮、高分子量氮的减小并相应增加pH值(p〈0.01)总的说来,小比例的麦芽添加到未发芽高粱糖化醪中并使用一定量的酶,被认为对未发芽高粱酿造高质量贮藏啤酒具有一定的作用。 相似文献
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本文对啤酒酿造过程中如何提高α-氨基氮含量进行了探讨,主要讨论了制麦过程和糖化过程中α-氨基氮含量的控制措施.结果表明,只要采取合理可行的措施,就能有效地提α-氨基氮含量,加速双乙酰还原,缩短发酵周期,从而达到保证啤酒风味稳定的目的. 相似文献
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啤酒中双乙酰含量的降低法:①提高麦汁中α-氨基氮的含量:选用优质麦芽和溶解良好的干麦芽进行生产,调整辅料与麦芽的配比,采用低温糖化法,粉碎麦芽33~35℃短时间浸渍,或52℃蛋白质休止,63~64℃糖化,以提高α-氨基氮和发酵 相似文献
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小麦胚芽蛋白制备及应用 总被引:1,自引:0,他引:1
小麦胚芽蛋白是一种完全蛋白,其氨基酸全面平衡,且易于被人体吸收,在营养学上具有重要意义。该文主要对小麦胚芽蛋白营养价值、制备及其应用进行综述。 相似文献
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Yongfen Chen Nurhan T Dunford Jeff Edwards Brett Carver Carla Goad 《Journal of the science of food and agriculture》2009,89(2):310-314
BACKGROUND: Policosanol (PC) is a mixture of high‐molecular‐weight aliphatic primary saturated alcohols which possesses cholesterol‐lowering properties. Literature on PC contents and compositions of wheat varieties is limited. The main objective of this study was to evaluate the effect of genotype and environment on PC content and composition in wheat grain. RESULTS: Grain samples were collected from three varieties, Jagger, Trego and Intrada, grown at three locations, Alva, Balko and Goodwell, OK, in 2005. Two sets of samples were obtained from Goodwell (irrigated and dryland samples). Total PC content and PC composition in whole wheat grain samples were determined using a gas chromatography system. PC contents of the whole wheat grain samples varied from 15.9 to 28.7 mg kg?1. Tricosanol, tetracosanol, hexacosanol, octacosanol and triacontanol were the most abundant PC components. Within each location a significant variety effect was observed. There was also a significant location × variety random effect on PC content. CONCLUSION: A fundamental understanding of compositional variation in wheat grain requires multi‐environment testing of genotypes, perhaps over several years. This study is the first step towards achieving this goal by revealing significant genetic differences in a limited set of genotypes. Copyright © 2008 Society of Chemical Industry 相似文献
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Fred Brouns Gonny van Rooy Peter Shewry Sachin Rustgi Daisy Jonkers 《Comprehensive Reviews in Food Science and Food Safety》2019,18(5):1437-1452
Wheat is an important staple food globally, providing a significant contribution to daily energy, fiber, and micronutrient intake. Observational evidence for health impacts of consuming more whole grains, among which wheat is a major contributor, points to significant risk reduction for diabetes, cardiovascular disease, and colon cancer. However, specific wheat components may also elicit adverse physical reactions in susceptible individuals such as celiac disease (CD) and wheat allergy (WA). Recently, broad coverage in the popular and social media has suggested that wheat consumption leads to a wide range of adverse health effects. This has motivated many consumers to avoid or reduce their consumption of foods that contain wheat/gluten, despite the absence of diagnosed CD or WA, raising questions about underlying mechanisms and possible nocebo effects. However, recent studies did show that some individuals may suffer from adverse reactions in absence of CD and WA. This condition is called non‐celiac gluten sensitivity (NCGS) or non‐celiac wheat sensitivity (NCWS). In addition to gluten, wheat and derived products contain many other components which may trigger symptoms, including inhibitors of α‐amylase and trypsin (ATIs), lectins, and rapidly fermentable carbohydrates (FODMAPs). Furthermore, the way in which foods are being processed, such as the use of yeast or sourdough fermentation, fermentation time and baking conditions, may also affect the presence and bioactivity of these components. The present review systematically describes the characteristics of wheat‐related intolerances, including their etiology, prevalence, the components responsible, diagnosis, and strategies to reduce adverse reactions. 相似文献
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