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[科技图书 ] The Role of Natural Antioxidants in Brain Disorders 进入全文
SpringerLink 网站
氧化应激和神经炎症被认为是帕金森氏症和阿尔茨海默氏症等各种神经系统疾病的致病因素。抗氧化剂是与氧化物种结合并消除其对生物分子造成损害的化学物质。抗氧化剂的主要来源是颜色鲜艳的水果、蔬菜、谷物、豆类和草药，其他非常有效的来源是浆果、绿茶和黑巧克力。这些化合物有可能阻碍神经退行性变，减少神经元死亡，改善记忆和认知功能。天然抗氧化剂在脑部疾病中的作用描述了各种神经保护作用及其由抗氧化剂介导的生理现象，以维持和调节针对脑部疾病的一般健康生物标志物。本书涵盖了抗氧化剂、饮食和生活方式在管理脑部疾病中的重要作用，以及它们与对抗氧化应激的传统疗法的结合使用。外源性和内源性抗氧化剂都得到了充分的探索。通过关注氧化应激作为各种脑部疾病的触发机制的作用，以及抗氧化食品与传统疗法结合使用来对抗和预防这些疾病，这对食品科学、营养学、健康科学和生理学的研究人员来说是一个有价值的来源。
[学术文献 ] Determination of tolfenpyrad residues in green tea by GC-MS/MS based on acetonitrile extractant, dispersion solid phase extraction purification 进入全文
Journal of Environmental Science and Health, Part B 期刊
Green tea is one of people’s favorite drinks. However, pesticide residues in green tea can cause harm to the human body, and therefore, detection of pesticide residues in green tea is very important. In recent years, the detection of pesticide residues in tea has become a research hotspot. In this paper, a gas chromatography-mass spectrometry/mass spectrometry (GC-MS/MS) detection method of tolfenpyrad pesticide residues in green tea was established by using acetonitrile extractant, dispersive solid-phase extraction purification, temperature programming and application retention time lock with the database. After the sample was extracted with acetonitrile, then the sample was purified by QuEChERS extraction purification tube, afterward isomer B was used as the internal standard for the determination by multiple reaction monitoring mode (MRM) of GC-MS/MS. The results indicated that the experimental data accorded with the criterion on quality control of laboratoris(chemical testing of food), and the requirements of recovery, calibration curve, precision.This method was used to detect tolfenpyrad residues in actual green tea samples in multiple batches, and the satisfactory results were obtained.
[学术文献 ] Plant volatile organic compounds: Emission and perception in a changing world 进入全文
Current Opinion in Plant Biology 期刊
Volatile organic compounds (VOCs) are produced by all kingdoms of life and play crucial roles in mediating the communication between organisms and their environment through emission and perception. Plants, in particular, produce and emit an exceptional variety of VOCs that together serve as a complex chemical language facilitating intra-plant, inter-plant, plant–animal, and plant–microbe interactions. VOC signals are perceived and decrypted by receiver plants; however, the emission, composition, distribution and effective range, as well as uptake of these infochemicals depend on temperature and atmospheric chemistry in addition to their physicochemical properties. Since both emission and perception are directly affected by ongoing climate change, research into these processes is urgently needed to develop mitigation strategies against this threat to plant communication networks. In this brief review, we highlight the recent advances about plant VOC emission and perception, emphasizing the effect of the current climate crisis on these processes. Despite some progress in understanding VOC emission and perception, significant gaps remain in elucidating their molecular mechanisms in plants.
[学术文献 ] Plant Volatile Organic Compounds: Revealing the Hidden Interactions 进入全文
Plant-Basel 期刊
Volatile organic compounds (VOCs), classified as secondary or specialized metabolites, are essential for plant health. Plant volatiles are intricate, multi-faceted signals frequently utilized by pollinators alongside other cues, such as color. Although the entire plant, from roots to seeds to stems to leaves and fruits, produces VOCs, the flowers release the most significant quantity and number of these compounds. Scent is a powerful tool for floral visitors. They can use it to gauge the quantity of reward in flowers, identify which flowers to visit, or send signals chemically similar to those pollinating insects employed in other environments. Plants emit VOCs subterraneously to sense their surrounding community, strategize for or evade competition with adjoining flora, and serve as alert signals to proximate plants under specific circumstances. Furthermore, climate change (e.g., increased temperatures, drought stress, raised CO2, and O3) has significantly affected plant quality and the interactions between plants and their environment, both subterranean and aerial. There is still much mystery surrounding the functions of these compounds in plant interactions, biotic stress, and abiotic stress. Several reviews and research articles in this Special Issue focused on the function of plant volatiles in different plant and human lifecycles.
[学术文献 ] Cracking the plant VOC sensing code and its practical applications 进入全文
Trends in Plant Science 期刊
Volatile organic compounds (VOCs) are essential airborne mediators of interactions between plants. These plant–plant interactions require sophisticated VOC-sensing mechanisms that enable plants to regulate their defenses against pests. However, these interactions are not limited to specific plants or even conspecifics, and can function in very flexible interactions between plants. Sensing and responding to VOCs in plants is finely controlled by their uptake and transport systems as well as by cellular signaling via, for example, chromatin remodeling system-based transcriptional regulation for defense gene activation. Based on the accumulated knowledge about the interactions between plants and their major VOCs, companion plants and biostimulants are being developed for practical applications in agricultural and horticultural pest control, providing a sustainable alternative to harmful chemicals.
[前沿资讯 ] Tea & Climate Change: The Looming Threat of Greenfly Infestation 进入全文
World Tea News 网站
一种迅速蔓延的绿蝇（Empoasca flavescens，也被称为茶小绿叶蝉）已经成为印度茶叶种植园的可怕威胁，特别是在盛产茶叶的阿萨姆邦和西孟加拉邦，它导致作物健康状况灾难性下降，产量大幅下降。行业专家发出警告，这些害虫现在全年都很活跃，导致某些地区的产量下降了11%-55%。在茶园的第二季（5月至7月），损失尤为严重，这一季占茶园年收入的30%以上。专家将日益严重的绿蝇袭击归咎于气候危机。传统上，绿蝇是一种旱季害虫，受第一次洪水主要影响，但由于气候变化，其种群现在全年持续存在。绿蝇造成的破坏不会以直接破坏植株而结束，衰弱的茶树极易受到真菌枯萎病等次生感染，导致广泛的叶片坏死，进一步降低茶树生产力。绿蝇和枯萎病的双重攻击使茶产业处于危险的境地。专家们现在建议，现在是时候寻找替代解决方案了——更新、更有效的杀虫剂、综合虫害管理实践，以及侧重于打破害虫抗药性的研究战略。
