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1.
草莓酿酒特性和人工加糖发酵工艺的研究   总被引:9,自引:0,他引:9  
研究表明,草莓果实无皮无核,酸甜爽口,香型独特,原料丰富,适于酿酒。但草莓糖分低,自然发酵的草莓酒酒度低,易污染酸败。采用葡萄酒活性干酵母和加糖发酵可以显著提高草莓发酵酒的酒度和品质,ll项技术质量指标优于自然发酵。添加S0260—80mg/L原液可以有效控制杂菌污染。发酵温度2l—23℃比较适宜。本文提供了草莓发酵酒人工加糖发酵生产工艺流程。  相似文献   

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该试验以草莓\"章姬\"\"红颜\"为试材,叶面喷施不同浓度亚硒酸钠溶液,探究硒素对草莓果实抗氧化活性及相关物质含量的影响。结果表明:在适当浓度范围内,草莓果实中总硒、抗氧化活性和抗氧化物质含量都随着施硒浓度的升高而增加。硒浓度为20 mg/L时,总硒含量、抗氧化活性和抗氧化物质含量均达最大值,此浓度为最佳喷施浓度。  相似文献   

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BACKGROUND: A greenhouse experiment was performed to study the effect of cumulative air temperature and photosynthetically active radiation (PAR) on tomato quality. Tomato plants were subjected to two different shading treatments causing a 30 and 50% reduction in incoming PAR respectively (plants were exposed to 70 and 50% of incoming PAR respectively). Control plants (exposed to 100% of incoming PAR) were also included in the experiment. The experiment was carried out under unheated greenhouse conditions. To minimise the dependence of temperature on PAR, only a small area inside a large greenhouse was shaded, thereby allowing air currents to homogenise temperature all over the enclosure. Parameters of tomato quality were correlated with cumulative temperature (Tcum) and cumulative PAR (PARcum) for a period of 45 days before harvest. RESULTS: Tcum was strongly correlated with firmness, electrical conductivity, soluble solids content and total phenolic compounds and weakly correlated with pH, dry weight, titratable acidity and vitamin C content. PARcum was only weakly correlated with firmness, dry weight, soluble solids content and total phenolic compounds. CONCLUSION: Tcum has a stronger influence on tomato quality than PARcum. Growers could obtain tomatoes of similar quality under lower PAR than that provided by natural sunlight. Copyright © 2007 Society of Chemical Industry  相似文献   

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草莓多酚类植物化学物研究进展   总被引:2,自引:0,他引:2  
草莓是世界上栽培最广泛的水果之一,具有很高的营养价值和经济价值。草莓中富含维生素、矿物质、膳食纤维等传统的营养性成分,而且其中的多酚类植物化学物(主要为草莓酚酸类黄酮、草莓鞣花单宁、草莓原花青素、草莓花青素等)具有良好的抗氧化、防衰老、抗炎症、保护皮肤、改善消化系统病理学状况、预防慢性非传染性疾病(如高血压、高血脂、心脑系统疾病等)、参与细胞信号流、调控转录因子及与细胞代谢和存活相关基因的表达等功能。众多研究表明,增加这类物质的摄入对于人类保健和一些疾病预防有着重要的作用。本文就近年来草莓果实中主要的功能性成分及对人体健康的功用进行了综述,主要集中于多酚类植物化学物,旨在为草莓功能性成分的研究提供综合信息。  相似文献   

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6个草莓品种营养品质与抗氧化能力研究   总被引:4,自引:0,他引:4       下载免费PDF全文
罗娅  唐勇  冯珊  周迪  汤浩茹 《食品科学》2011,32(7):52-56
本研究对6个草莓品种的质量参数(可溶性固形物、可滴定酸和硬度)和营养参数(总酚、类黄酮、花青素、抗坏血酸、VE和抗氧化能力)进行测定与分析,目的在于筛选具有较高营养价值的草莓遗传资源。研究表明,总酚是草莓抗氧化作用的重要物质基础,花青素与抗坏血酸是草莓抗氧化能力的主要组成参数。在6个草莓品种中,红太后的营养品质表现最好,是培育高含量生物活性物质新品种的重要遗传资源,然而基因型是决定草莓营养品质的重要因素。  相似文献   

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草莓酵素发酵过程中代谢产物及抗氧化性的变化研究   总被引:1,自引:0,他引:1  
以草莓为原材料,发酵制备酵素,探究发酵过程中总糖、总多酚、总酸及特征性有机酸等功能成分的变化,研究各功能成分与4种抗氧化参数(DPPH、羟基、ABTS等三种自由基清除率及还原力)的相关性,并基于主成分分析降维思想,建立有关草莓酵素的综合评价系统.结果表明:草莓酵素在发酵前期(20 d前)总糖含量下降不多,总酚、总酸、柠...  相似文献   

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不同提取条件对草莓果实抗氧化物质和抗氧化活性的影响   总被引:3,自引:0,他引:3  
以草莓栽培品种“丰香”(Fragaria ananassa Toyonaka,)绿熟阶段的果实为试材,研究提取试剂、温度、时间对草莓果实抗氧化物质和抗氧化活性的影响。结果表明,甲醇-水-盐酸(体积比80:19.9:0.1)提取物中总酚、类黄酮、抗坏血酸,DPPH自由基清除能力和铁还原氧化能力显著高于甲醇、乙醇、甲醇-乙醇-丙酮体积比(1:1:1)和水的提取物。然而,抗氧化物质提取的最佳条件(60℃,480min)与获得最高抗氧化活性的提取条件(25℃,120min)并不一致,说明抗氧化物质含量的高低并不总是草莓果实提取物抗氧化活性强弱的指示剂。综合抗氧化物质的提取量以及提取物的抗氧化活性,甲醇-水-盐酸(体积比 80:19.9:0.1)在25℃进行120min草莓果实抗氧化物质的提取更为适合。  相似文献   

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Strawberry and kiwi leathers were used to develop a new healthy and preservative‐free fruit snack for new markets. Fruit puree was dehydrated at 60 °C for 20 h and subjected to accelerated storage. Soluble solids, titratable acidity, pH, water activity (aw), total phenolic (TP), antioxidant activity (AOA) and capacity (ORAC), and color change (browning index) were measured in leathers, cooked, and fresh purees. An untrained panel was used to evaluate consumer acceptability. Soluble solids of fresh purees were 11.24 to 13.04 °Brix, whereas pH was 3.46 to 3.39. Leathers presented an aw of 0.59 to 0.67, and a moisture content of 21 kg water/100 kg. BI decreased in both leathers over accelerated storage period. TP and AOA were higher (P ≤ 0.05) in strawberry formulations. ORAC decreased 57% in strawberry and 65% in kiwi leathers when compared to fruit puree. TP and AOA increased in strawberries during storage. Strawberry and Kiwi leathers may be a feasible new, natural, high antioxidant, and healthy snack for the Chilean and other world markets, such as Europe, particularly the strawberry leather, which was preferred by untrained panelists.  相似文献   

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The study focused on characterizing the 10 major Moroccan cultivars to acknowledge the quality and bioactive compounds of the fruits. The following determinations were assessed: pomegranate fruit maturity index, which truly defines juice taste, as well as organic acids and sugar contents, total phenols, and antioxidant activity of pomegranate juice. The cultivar per se (genotype) behaved as the most influencing factor conditioning pomegranate sugar and organic acids profiles, antioxidant activity, and total phenolics. The assessment of pomegranate chemical compositions implies the great potential of Moroccan cultivars for both fresh market and fruit processing. In fact, the \"Hamde\" sour cv. seems particularly suitable for juice production because of its high phenolics content. Additionally, the presence of bioactive compounds in pomegranate juices may encourage their consumption for potential health benefits. PRACTICAL APPLICATION: The cultivar per se (genotype) behaved as the most influencing factor conditioning pomegranate sugar and organic acids profiles, antioxidant activity, and total phenolics. Given the divergence observed on bioactive compounds concentrations and antioxidant activity among evaluated cultivars, the genotype factor should be considered as the most influencing factor in future breeding programs to enhance the synthesis of beneficial bioactive compounds.  相似文献   

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不同浓度1-MCP对草莓保鲜效果的研究   总被引:10,自引:0,他引:10  
李雪枝  郑铁松  战旭梅 《食品科学》2006,27(11):513-516
采用三种不同浓度的1-MCP对日本“明宝”草莓进行保鲜处理,浓度分别采用0.25、0.5和0.9μl/L,定期检测硬度、可溶固形物、叶绿素、多酚氧化酶、呼吸强度和丙二醛指标。结果表明,1-MCP能较好的保持果实硬度,减缓了可溶固形物的升高,阻止了叶绿素的降解,抑制了多酚氧化酶活性的增高;但是对呼吸强度的影响不明显,而且高浓度1-MCP促进了丙二醛含量的增大。  相似文献   

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目的 探讨不同植物精油对草莓贮藏期间品质和抗氧化能力的影响,为草莓保鲜提供新的方法。方法 以“红颜”草莓为试材,分别用不同质量浓度(40、80、160和320 μg/mL)的百里香精油、丁香花精油、肉桂精油、枯茗醛和柠檬醛进行处理,测定其在20℃贮藏期间的失重率、腐烂指数、理化性质、抗氧化物质含量和抗氧化酶活性等指标。结果 柠檬醛在40 μg/mL质量浓度时具有最佳保鲜效果,能够有效地降低草莓果实的失重率和腐烂指数,延缓可溶性固形物、可滴定酸和抗坏血酸含量的下降,维持较高的总酚和总黄酮含量,并提高果实对1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl, DPPH)自由基和羟基自由基的清除能力。此外,该处理还能显著提高过氧化氢酶、超氧化物歧化酶、抗坏血酸过氧化物酶等抗氧化酶的活性,且有效抑制丙二醛含量的升高。结论 柠檬醛在草莓贮藏中具有良好的保鲜效果,能够保持其品质和营养价值,这为柠檬醛在水果贮藏保鲜中的应用提供了依据。  相似文献   

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Abstract: Ten promising jujubes were analyzed for textural characteristic (hardness), antioxidant activity, sugar, organic acid, and phenolic profiles. Total phenolic content (TP) measured by Folin–Ciocalteu method ranged from 275.6 to 541.8 mg of gallic acid equivalents per 100 g fresh weight (mg GAE/100 g FW). Four sugars (rhamnose, fructose, sucrose, and glucose), 3 organic acids (malic, citric, and succinic acids), and 11 phenolic compounds (gallic acid, protocatechuic acid, cinnamic acid, chlorogenic acid, caffeic acid, ferulic acid, ellagic acid, catechin, epicatechin, rutin, and quercetin) were identified and quantified by high‐performance liquid chromatography in jujube fruits. The results showed that ascorbic acid and proanthocyanidins contents were positively correlated with hardness, and antioxidant activity was well correlated with TP content. Among 10 jujube cultivars, Zizyphus jujuba cv. Qingjianmuzao is good for direct consumption containing high levels of total soluble solids, total sugars, fructose, and glucose, while Zizyphus jujuba cv. Jiaxianmuzao could be an important dietary source of natural antioxidants. Practical Application: Genotype is the main factor influencing the composition of bioactive compounds in jujubes. Zizyphus jujuba cv. Qingjianmuzao is good for direct consumption, while Zizyphus jujuba cv. Jiaxianmuzao could be an important dietary source of natural antioxidants for prevention of diseases caused by oxidative stress.  相似文献   

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叶面喷施秸秆源提取物对草莓果实产量和品质的影响   总被引:1,自引:0,他引:1  
为了提高设施温室种植草莓的生产效率和产品附加值,以草莓品种‘红颜’为试材,在冬季设施温室内,通过叶面喷施的方式以秸秆源提取物对草莓植株进行处理,探讨不同喷施量的处理对草莓的产量、单果质量、感病率和采后果实的可溶性糖、尤其是抗坏血酸、花青素、总酚物质等抗氧化性营养指标的影响。结果表明:叶面喷施秸秆源提取物的最适喷施方法为:用量1 200 mL/(hm2·次),每隔10 d喷施1 次,共喷施3 次,能够显著提高草莓果实的产量、单果质量和营养品质,尤其对果实抗坏血酸含量的提高作用最明显,草莓果实的商品价值得到了显著提升。  相似文献   

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研究蔗糖、果糖、葡萄糖以及蔗糖结合超声渗透预处理对真空冷冻联合热风干燥草莓片品质及其抗氧化活性影响。结果表明:经预处理后干燥草莓片的品质、花色苷、总酚、黄酮、Vc含量和抗氧化能力均有显著性差异(p0.05),其中蔗糖结合超声前处理水分含量最低,硬度最高,而经蔗糖渗透处理的草莓片干燥后色泽与新鲜草莓最接近,a*最高;干燥后草莓片的花色苷、总酚和黄酮含量均高于鲜样,但Vc含量大大降低,其中经蔗糖结合超声预处理后的草莓片花色苷、总酚和黄酮含量最高,分别为22.68 g/L、7.52 mg/g、10.38 mg/g,其对-OH和DPPH清除率也高于其他组,但渗透和超声处理并不能提高草莓片Vc含量和铁离子还原能力;三种糖渍处理均能提高干燥草莓片品质,且蔗糖效果最佳。综上,渗透以及蔗糖结合超声预处理后草莓片品质以及抗氧化活性成分含量较高、抗氧化活性较强,适宜于草莓片的干燥。  相似文献   

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《Journal of dairy science》2019,102(6):4978-4988
Fruit juice addition can influence the physiochemical and sensory properties of fermented milk. Effects of adding strawberry juice (15% vol/vol) pre- or postfermentation on particle size, rheology properties, volatile flavor profile, and microstructure of fermented goat milk were investigated. Samples with juice added prefermentation showed larger reinforcement in particle size, apparent viscosity, and storage and loss moduli than samples with juice added postfermentation. Compared with the control, all samples showed improved fruit aroma and reduced goaty flavor; this effect was more remarkable in samples in which juice was added before fermentation. Fermented goat milk with strawberry juice added prefermentation showed the highest levels of 1-hexanol and 2-hexen-1-ol (26.16 and 22.03%, respectively) and the lowest percentage of octanoic acid (2.47%), which are mainly responsible for fruit and goaty flavor, respectively. Microstructure analysis showed that samples with juice added prefermentation had a compact protein network. Results indicated that addition of strawberry juice before fermentation may be a good technology for developing a stirred strawberry fermented goat milk.  相似文献   

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