Results 11 to 20 of about 1,025,688 (169)

干燥方式对迷迭香脂溶性抗氧化物质 得率及抗氧化活性的影响 Effects of drying methods on yield and antioxidant activity of fat-soluble antioxidant components from Rosmarinus officinalis

open access: yesZhongguo youzhi, 2022
通过研究不同生长期对迷迭香脂溶性抗氧化物质(鼠尾草酸、鼠尾草酚和熊果酸)得率的影响筛选出最佳生长期,在此基础上测定不同干燥方式(阴干、烘干(45 ℃)和晾晒)下迷迭香脂溶性抗氧化物质得率,DPPH自由基、ABTS+自由基、羟自由基清除能力和铁还原力,以考察不同干燥方式对迷迭香脂溶性抗氧化物质抗氧化活性的影响。结果表明:迷迭香抗氧化物质积累的最佳生长期为10个月,3种不同干燥方式中烘干处理的迷迭香所提脂溶性抗氧化物质的得率最大,DPPH自由基、ABTS+自由基、羟自由基清除能力和铁还原力均最强 ...
王莹,邓慧,黄大川,曾祥辉,张钦,贺秋平 WANG Ying, DENG Hui, HUANG Dachuan, ZENG Xianghui, ZHANG Qin, HE Qiuping
doaj   +1 more source

改性ZSM-5分子筛催化臭氧氧化含硅间甲酚

open access: yesGongye shui chuli, 2022
在高效催化臭氧氧化煤化工废水过程中,水中的硅酸盐会使催化剂失活。本研究以ZSM-5分子筛为载体,使用等体积浸渍的方法成功制备了一系列抗硅催化剂,考察了活性组分种类、前驱体盐溶液种类、焙烧温度和活性组分负载量等相关工艺参数对催化剂抗硅性能和催化臭氧氧化降解含硅间甲酚模型废水效果的影响,并对抗硅催化剂进行了表征分析。结果表明,ZSM-5分子筛以Fe(NO3)3·9H2O作为前驱体盐浸渍,500 ℃焙烧,活性组分Fe负载量为3%(质量分数)时的抗硅催化剂呈现出优异的空间结构 ...
陈晓飞   +5 more
doaj  

抗氧化剂耦合非生物胁迫调控微藻油脂和类胡萝卜素合成的研究进展Progress on combination of antioxidant and abiotic stress in the regulation of lipid and carotenoid production in microalgae

open access: yesZhongguo youzhi, 2022
微藻代谢物产率低的问题制约了微藻的产业化发展,近年来利用抗氧化剂耦合非生物胁迫成为有效解决微藻代谢物产率低的方法之一。为了对微藻在非生物胁迫条件下高效合成油脂和类胡萝卜素提供新的思路,综述了抗氧化剂耦合非生物胁迫调控微藻合成油脂和类胡萝卜素的研究进展,并进一步分析了抗氧化剂调控次级代谢产物合成和微藻细胞抗性的作用机制。抗氧化剂可通过调控微藻细胞内氧化还原平衡、信号转导和相关基因的转录水平,维持微藻生长,促进代谢产物的积累,并缓解氧化损伤。 The low yield of microalgae ...
顾聃,赵永腾,乔腾生,余旭亚 GU Dan, ZHAO Yongteng, QIAO Tengsheng, YU Xuya
doaj   +1 more source

Hierarchical VO2@BiVO4 Films Decorated With Porous BiVO4 Nanoplates for Durable and Self‐Cleaning Smart Windows

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT VO2 is a promising thermochromic material, but it is still limited by low transparency, weak solar modulation, and poor stability. Here, we develop a coordination‐compound‐derived strategy to construct a hierarchical BiVO4/VO2@BiVO4 film with a core–shell@nanosheet structure.
Huiyan Xu   +11 more
wiley   +1 more source

Harnessing Trace Elements: Novel Radiosensitization Strategies for Enhanced Cancer Radiotherapy

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Radiotherapy (RT) is one of the core methods of comprehensive cancer treatment. Globally, more than 40% of cancer patients rely on radiotherapy to achieve tumor control, cure or palliative relief. However, radiation resistance, immunosuppression and normal tissue injury limit its clinical application.
Yuhuan Zhang   +6 more
wiley   +1 more source

复配天然抗氧化剂提高人造奶油氧化稳定性的研究Improvement of oxidative stability of margarine by compound natural antioxidants

open access: yesZhongguo youzhi
旨在提高人造奶油的氧化稳定性以及为复配天然抗氧化剂的应用提供理论基础,研究了6种天然抗氧化剂(生育酚、茶多酚、抗坏血酸、迷迭香提取物、竹叶抗氧化物、β-胡萝卜素)单独以及复配添加对人造奶油氧化稳定性的影响,并评价生育酚与其他5种抗氧化剂之间的相互作用,随后,将添加最佳复配抗氧化剂的人造奶油用于曲奇饼干的制作,考察复配天然抗氧化剂对曲奇饼干加速贮藏期间理化指标(酸值、过氧化值、p-茴香胺值、水分含量)和脂肪酸组成的影响,并基于加速贮藏实验建立一级动力学-Arrhenius联合模型预测曲奇饼干的货架期 ...
聂梓洮1,张雪怡2,郭怡雯1,刘睿杰1,常明1 NIE Zitao1, ZHANG Xueyi2, GUO Yiwen1, LIU Ruijie1, CHANG Ming1
doaj   +1 more source

Study on the thermal oxidation stability of an endothermic hydrocarbon fuel(吸热型碳氢燃料的热氧化安定性研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2007
采用静态法测定了自行研制的吸热型碳氢燃料ZH-100在加强氧化条件下的热氧化安定性能,用红外光谱检测ZH-100热氧化前后官能团的变化.结果表明,在160 ℃下加强氧化5 h后燃料组分中除了原有的—CH3和—CH2—官能团外,还明显检出了羟基、羰基和碳碳双键3种官能团,红外分析结果很好地解释了燃料经加强氧化后颜色发生变化的原因.通过碘量比色法对氧化过程中生成的过氧化物进行定量分析,解释了燃料的热氧化反应机理,评价了3种抗氧化剂的效果.结果显示合适的抗氧化剂可以使燃料的热氧化安定性有一定程度的提高.
YUJin-hua(余金花)   +4 more
doaj   +1 more source

Titanium Implant Abutments With Polydopamine‐Mesoporous Cerium Dioxide Coatings for Enhanced Antibacterial, Anti‐Inflammatory, and Soft Tissue Integration Properties

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT The poor soft tissue integration around titanium implants creates a microgap that serves as a pathway for pathogen invasion, resulting in infection, inflammation, and the progression of peri‐implantitis. As the implant’s transmucosal component, the abutment determines the degree of peri‐implant soft tissue attachment.
Xuan Li   +7 more
wiley   +1 more source

酚类抗氧化剂的主要转化产物 ——醌的研究进展

open access: yesZhongguo youzhi
酚类抗氧化剂在抗氧化过程中的主要转化产物为醌类物质,为了更深入地了解这些醌类物质的特点,从化学结构、检测方法、抗氧化作用等方面总结常用抗氧化剂生育酚、鼠尾草酚、迷迭香酚、茶多酚、特丁基对苯二酚(TBHQ)的主要转化产物生育醌、鼠尾草醌、迷迭香醌、表儿茶素类醌及叔丁基对苯醌(TBBQ)的研究进展,另外,对一些醌类的细胞毒性进行了归纳。上述几种酚类抗氧化剂的转化产物醌类物质,多采用高效液相色谱法检测,它们中大部分具有抗氧化活性,有些则在一定条件下具有促氧化效果。目前 ...
于亚星1,2,鲁海龙3,孙尚德1,2,毕艳兰1,2 YU Yaxing1,2,LU Hailong3,SUN Shangde1,2,BI Yanlan1,2
doaj   +1 more source

Effects of Ultrasonic Washing on Antioxidant Systems of Fresh-Cut Red Cabbages(超声波清洗对鲜切紫甘蓝抗氧化系统的影响) [PDF]

open access: yesShipin kexue jishu xuebao
To explore the influences of ultrasonic washing on the antioxidant systems of fresh-cut red cabbages, fresh-cut red cabbages were subjected to ultrasonic washing [frequency (28±2) kHz, power density 60W/L, frequency cycle time 400ms, and ultrasonic time ...
HONG Chen(洪晨)   +4 more
doaj   +1 more source

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