organic acids

有机酸
  • 文章类型: Journal Article
    金莲花(TCB)是毛茸茸科的多年生植物,具有药用和食用价值。它分布广泛,在各个地区普遍使用,包括亚洲,欧洲,和北美。TCB的主要化学成分包括生物碱,黄酮类化合物,酚酸,和挥发油化合物。TCB以其抗炎作用而闻名,清热,解毒,和改善视力的特性。其干花常用作治疗上呼吸道感染的中药,慢性扁桃体炎,咽炎,流感,还有支气管炎.现代药理学已经证明了抗癌,抗炎,抗高血压药,和TCB的抗氧化作用。本研究全面概述了TCB的各个方面,包括草药文本研究,植物学,植物化学,药理学,传统用途,临床应用,和质量控制,旨在为TCB的科学应用以及现代研究与传统药用的整合提供新思路。
    Trollius chinensis Bunge (TCB) is a perennial plant of the Ranunculaceae family with medicinal and edible values. It is widely distributed and commonly used in various regions, including Asia, Europe, and North America. The main chemical components of TCB include alkaloids, flavonoids, phenolic acids, and volatile oil compounds. TCB is renowned for its anti-inflammatory, heat-clearing, detoxifying, and eyesight-improving properties. Its dried flowers are commonly used as a traditional Chinese medicine indicated for the treatment of upper respiratory tract infections, chronic tonsillitis, pharyngitis, influenza, and bronchitis. Modern pharmacology has demonstrated the anti-cancer, anti-inflammatory, antihypertensive, and antioxidant effects of TCB. This study presents a comprehensive overview of various aspects of TCB, including herbal textual research, botany, phytochemistry, pharmacology, traditional uses, clinical application, and quality control, aiming to provide new ideas on the scientific application of TCB as well as the integration of modern research with traditional medicinal uses.
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  • 文章类型: Journal Article
    植物生长依赖于根际中存在的矿物质养分。土壤中养分的分布取决于它们的流动性和与土壤颗粒结合的能力。因此,植物经常在根际中遇到低水平或高水平的营养。植物根系是感知土壤矿物质含量变化的重要器官,导致与植物结构和代谢反应调整相关的信号通路激活。在根际矿物质的不同可用性期间,植物触发适应策略,如矿物质的细胞再动员,有机分子的分泌,以及根系生长的减弱或增强以平衡养分吸收。相互依存,可用性,和矿物质的吸收,如磷(P),铁(Fe),锌(Zn),钾(K),氮(N)形式,硝酸盐(NO3-),和铵(NH4+),调节植物的根结构和代谢功能。这里,我们总结了主要营养素(N,P,K,Fe,Zn)在塑造根系结构方面,生理反应,涉及的遗传成分,并解决当前与营养-营养相互作用相关的挑战。此外,我们讨论了在该领域开发具有改善养分吸收和利用效率的植物以实现可持续农业的主要差距和机会。
    Plant growth relies on the mineral nutrients present in the rhizosphere. The distribution of nutrients in soils varies depending on their mobility and capacity to bind with soil particles. Consequently, plants often encounter either low or high levels of nutrients in the rhizosphere. Plant roots are the essential organs that sense changes in soil mineral content, leading to the activation of signaling pathways associated with the adjustment of plant architecture and metabolic responses. During differential availability of minerals in the rhizosphere, plants trigger adaptation strategies such as cellular remobilization of minerals, secretion of organic molecules, and the attenuation or enhancement of root growth to balance nutrient uptake. The interdependency, availability, and uptake of minerals, such as phosphorus (P), iron (Fe), zinc (Zn), potassium (K), nitrogen (N) forms, nitrate (NO3-), and ammonium (NH4+), modulate the root architecture and metabolic functioning of plants. Here, we summarized the interactions of major nutrients (N, P, K, Fe, Zn) in shaping root architecture, physiological responses, genetic components involved, and address the current challenges associated with nutrient-nutrient interactions. Furthermore, we discuss the major gaps and opportunities in the field for developing plants with improved nutrient uptake and use efficiency for sustainable agriculture.
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  • 文章类型: Journal Article
    铝(Al),植物生长的非必需金属,发挥显著的植物毒性作用,特别是在根系生长方面。人为活动会通过将Al3释放到土壤溶液中而加剧Al的毒性作用,尤其是在pH值低于5.5且矿物质含量丰富的酸性土壤中。铝诱导的植物毒性的严重程度取决于铝浓度等因素,离子形式,植物物种,和成长阶段。铝毒性导致根和芽生长受到抑制,植物生物量减少,水分吸收中断导致营养失衡,和生理上的不利变化,生物化学,和分子过程。这些影响共同导致植物产量和质量下降,随着土壤肥力的下降。植物在胁迫条件下采用各种机制来对抗Al毒性,包括将Al隔离在空泡中,分泌有机酸(OAs)如柠檬酸盐,草酸盐,和苹果酸从根尖细胞形成铝复合物,激活抗氧化酶,和过表达Al胁迫调节基因。最近的进展集中在加强OAs的渗出,以防止Al进入工厂,开发耐铝品种。基因转运蛋白家族,如ATP结合盒(ABC),铝激活苹果酸盐运输车(ALMT),天然抗性相关巨噬细胞蛋白(Nramp),多种药物和有毒化合物挤出(MATE),和水通道蛋白,在调节铝的毒性中起着至关重要的作用。这篇全面的综述审查了在细胞和分子水平上了解Al对植物的细胞毒性影响的最新进展。讨论了植物和科学家开发的减轻铝诱导的植物毒性的多种策略。此外,这篇综述探讨了最近的基因组发展,确定负责OAs渗出的候选基因,并深入研究了基因组介导的育种计划,分离转基因和高级育种品系以培养耐铝植物。
    Aluminum (Al), a non-essential metal for plant growth, exerts significant phytotoxic effects, particularly on root growth. Anthropogenic activities would intensify Al\'s toxic effects by releasing Al3+ into the soil solution, especially in acidic soils with a pH lower than 5.5 and rich mineral content. The severity of Al-induced phytotoxicity varies based on factors such as Al concentration, ionic form, plant species, and growth stages. Al toxicity leads to inhibited root and shoot growth, reduced plant biomass, disrupted water uptake causing nutritional imbalance, and adverse alterations in physiological, biochemical, and molecular processes. These effects collectively lead to diminished plant yield and quality, along with reduced soil fertility. Plants employ various mechanisms to counter Al toxicity under stress conditions, including sequestering Al in vacuoles, exuding organic acids (OAs) like citrate, oxalate, and malate from root tip cells to form Al-complexes, activating antioxidative enzymes, and overexpressing Al-stress regulatory genes. Recent advancements focus on enhancing the exudation of OAs to prevent Al from entering the plant, and developing Al-tolerant varieties. Gene transporter families, such as ATP-Binding Cassette (ABC), Aluminum-activated Malate Transporter (ALMT), Natural resistance-associated macrophage protein (Nramp), Multidrug and Toxic compounds Extrusion (MATE), and aquaporin, play a crucial role in regulating Al toxicity. This comprehensive review examined recent progress in understanding the cytotoxic impact of Al on plants at the cellular and molecular levels. Diverse strategies developed by both plants and scientists to mitigate Al-induced phytotoxicity were discussed. Furthermore, the review explored recent genomic developments, identifying candidate genes responsible for OAs exudation, and delved into genome-mediated breeding initiatives, isolating transgenic and advanced breeding lines to cultivate Al-tolerant plants.
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  • 文章类型: Journal Article
    L-2-羟基戊二酸尿症(L2HGA)是一种常染色体隐性遗传,以精神运动延迟和小脑功能障碍为特征的缓慢进行性神经退行性疾病。生化标志是体液中L2HG的浓度增加。脑MRI表现出白质受累的特征性向心延伸,将其与其他脑白质营养不良区分开来。作者报告了来自巴基斯坦的两姐妹L2HGA,随访4年。作者还比较了我们患者的临床结果与45例先前报道的L2HGA患者的治疗和临床结果。
    作者报告了两个来自巴基斯坦的L2HGA姐妹,他们的亲生父母是近亲。15岁和17岁的女孩出现精神运动延迟,癫痫发作,共济失调,故意的震颤,和构音障碍.两者都有正常的人体测量年龄。除了小脑征象外,还观察到了夸张的肌腱反射和双侧持续的踝关节阵阵。尿液有机酸分析显示2-羟基戊二酸明显排泄,2-羟基戊二酸的手性分化表明它是L2HGA。15岁的脑MRI显示弥漫性皮质下白质改变,双侧T2/FLAIR高信号明显,特别是在向心分布的额叶区域,沿苍白球的受累有一定的扩散限制。特征性的MRI模式引起了L2HGA的怀疑。靶向L2HGDH测序鉴定了纯合致病变异,c.829C>T(p。Arg227*)在两个女孩的L2HGDH基因中。父母双方都是家族性变异体的杂合携带者。
    伴有基底神经节和齿状核受累的向心皮质下白质脑病的神经放射学特征对L2HGA相当特异,应导致进一步的生化研究以寻找L2HGA和L2HGDH基因测序。
    L-2-hydroxyglutaric aciduria (L2HGA) is an autosomal recessive, slowly progressive neurodegenerative disease characterized by psychomotor delay and cerebellar dysfunction. The biochemical hallmark is increased concentrations of L2HG in body fluids. Brain MRI exhibits characteristic centripetal extension of the white matter involvement that differentiates it from other leukodystrophies. The authors report two sisters from Pakistan with L2HGA with 4 years of follow-up. The authors have also compared the clinical outcome of our patients with 45 previously reported patients with L2HGA for whom treatment and clinical outcome was reported.
    UNASSIGNED: The authors report two sisters with L2HGA from Pakistan born to consanguineous parents. The 15- and 17-year-old girls presented with psychomotor delay, seizures, ataxia, intentional tremors, and dysarthria. Both had normal anthropometric measurements for age. Exaggerated tendon reflexes and bilateral sustained ankle clonus were observed in addition to cerebellar signs. Urine organic acids analysis showed marked excretion of 2-hydroxyglutaric acid, chiral differentiation of 2-hydroxyglutaric acid showed it to be L2HGA. Brain MRI of the 15-year-old showed diffuse subcortical white matter changes evident by T2/FLAIR hyperintense signals bilaterally, particularly in the frontal region in the centripetal distribution with some diffusion restriction along involvement of globus pallidus. The characteristic MRI pattern raised the suspicion of L2HGA. Targeted L2HGDH sequencing identified a homozygous pathogenic variant, c.829C>T (p.Arg227*) in L2HGDH gene in both girls. Both parents were heterozygous carriers of the familial variant.
    UNASSIGNED: Neuroradiological features of centripetal subcortical leukoencephalopathy with basal ganglia and dentate nuclei involvement are rather specific to L2HGA and should lead to further biochemical investigations to look for L2HGA and L2HGDH gene sequencing.
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  • 文章类型: Journal Article
    咖啡浪费通常被视为一个问题,但如果采用清洁技术和长期废物管理策略进行管理,它可以转化为增值产品。几种化合物,包括脂类,木质素,纤维素和半纤维素,单宁,抗氧化剂,咖啡因,多酚,类胡萝卜素,黄酮类化合物,生物燃料可以通过回收来提取或生产,recovery,或能源价格。在这次审查中,我们将讨论咖啡生产废物产生的副产品的潜在用途,包括种植的咖啡叶和花;咖啡浆,外壳,和来自咖啡加工的silverskin;以及来自消费后的废咖啡渣(SCG)。这些咖啡副产品的充分利用可以通过建立合适的基础设施和建立科学家之间的网络来实现,商业组织,和政策制定者,从而以可持续的方式减少咖啡加工的经济和环境负担。
    Coffee waste is often viewed as a problem, but it can be converted into value-added products if managed with clean technologies and long-term waste management strategies. Several compounds, including lipids, lignin, cellulose and hemicelluloses, tannins, antioxidants, caffeine, polyphenols, carotenoids, flavonoids, and biofuel can be extracted or produced through recycling, recovery, or energy valorization. In this review, we will discuss the potential uses of by-products generated from the waste derived from coffee production, including coffee leaves and flowers from cultivation; coffee pulps, husks, and silverskin from coffee processing; and spent coffee grounds (SCGs) from post-consumption. The full utilization of these coffee by-products can be achieved by establishing suitable infrastructure and building networks between scientists, business organizations, and policymakers, thus reducing the economic and environmental burdens of coffee processing in a sustainable manner.
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  • 文章类型: Journal Article
    生肉饮食(RMBDs)或有时被描述为生物适当的生食(BARFs)在狗和猫主人中越来越受欢迎。这些宠物监护人更喜欢他们的动物吃最低限度加工和更“天然”的食物,而不是用合成防腐剂制造的高度热加工的饮食。在美国,狗和猫的人民币市场估计为3300万美元。这个数字可能被低估了,因为一些宠物主人给他们的动物喂食在家准备的原始饮食。尽管需求不断增加,由于沙门氏菌等食源性病原体的污染,RMBD受到了许多召回的困扰,大肠杆菌,或者弯曲杆菌.关于狗/猫人民币D的缓解策略的现有文献非常有限。因此,就肉类和家禽加工中使用的技术以及与该行业无关的原材料,对已发表的研究进行了全面搜索(例如,肉类和家禽)。在这篇综述论文中,我们探索了多种非热过程和GRAS批准的食品添加剂,这些添加剂可以单独或组合用作潜在的抗菌剂,以断言阻碍微生物生长的多种应激源,最终通过障碍技术导致病原体灭活。这篇综述的重点是高压巴氏杀菌的使用,有机酸化剂,精油,和噬菌体是以相对较低的成本有效地进行商业巴氏杀菌的可能方法。提供了这些技术在过去用于控制肉类和家禽相关产品中的食源性病原体的不同方式的总结,以及它们如何能够成功地应用于阻碍用于伴侣动物的商业生产的生食中的肠病原体的生长。
    Raw meat-based diets (RMBDs) or sometimes described as biologically appropriate raw food (BARFs) are gaining in popularity amongst dog and cat owners. These pet guardians prefer their animals to eat minimally processed and more \"natural\" foods instead of highly heat-processed diets manufactured with synthetic preservatives. The market for RMBDs for dogs and cats is estimated at $33 million in the United States. This figure is likely underestimated because some pet owners feed their animals raw diets prepared at home. Despite their increasing demand, RMBDs have been plagued with numerous recalls because of contamination from foodborne pathogens like Salmonella, E. coli, or Campylobacter. Existing literature regarding mitigation strategies in RMBD\'s for dogs/cats are very limited. Thus, a comprehensive search for published research was conducted regarding technologies used in meat and poultry processing and raw materials tangential to this trade (e.g., meats and poultry). In this review paper, we explored multiple non-thermal processes and GRAS approved food additives that can be used as potential antimicrobials alone or in combinations to assert multiple stressors that impede microbial growth, ultimately leading to pathogen inactivation through hurdle technology. This review focuses on use of high-pressure pasteurization, organic acidulants, essential oils, and bacteriophages as possible approaches to commercially pasteurize RMBDs effectively at a relatively low cost. A summary of the different ways these technologies have been used in the past to control foodborne pathogens in meat and poultry related products and how they can be applied successfully to impede growth of enteric pathogens in commercially produced raw diets for companion animals is provided.
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  • 文章类型: Journal Article
    作为一种清洁高效的木质纤维素生物质分离方法,有机酸预处理已引起广泛的研究。选择性地分离半纤维素或木质素并保留纤维素结构。实现了木质纤维素生物质的有效分馏。总结了不同有机酸对半纤维素和木质素的分离特性。将半纤维素的有机酸分离成氢离子,根据分离机理,自催化和α-羟基酸。木质素的分离取决于有机酸的溶解机理和空间效应。此外,分析了有机酸预处理面临的挑战和前景。半纤维素的分离和酶水解对木质素的缩聚影响显著,通过添加绿色添加剂如酮或醇有效抑制。通过开发基于有机酸预处理的深度共晶溶剂处理来改善木质素分离。这项工作为高效清洁碳水化合物聚合物和木质素以促进全球碳中和提供了支持。
    As a clean and efficient method of lignocellulosic biomass separation, organic acid pretreatment has attracted extensive research. Hemicellulose or lignin is selectively isolated and the cellulose structure is preserved. Effective fractionation of lignocellulosic biomass is achieved. The separation characteristics of hemicellulose or lignin by different organic acids were summarized. The organic acids of hemicellulose were separated into hydrogen ionized, autocatalytic and α-hydroxy acids according to the separation mechanism. The separation of lignin depends on the dissolution mechanism and spatial effect of organic acids. In addition, the challenges and prospects of organic acid pretreatment were analyzed. The separation of hemicellulose and enzymatic hydrolysis of cellulose were significantly affected by the polycondensation of lignin, which is effectively inhibited by the addition of green additives such as ketones or alcohols. Lignin separation was improved by developing a deep eutectic solvent treatment based on organic acid pretreatment. This work provides support for efficient cleaning of carbohydrate polymers and lignin to promote global carbon neutrality.
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  • 文章类型: Journal Article
    这篇评论提供了对固体废物的价值化及其产生各种生物产品的机制的最新技术。这些废物中的有机物可以很容易地被微生物利用并产生增值化合物。微生物发酵技术可用于开发废物生物炼制工艺。在预处理步骤后,利用木质纤维素和塑料废物来产生微生物利用的碳源将使该过程成为多产品生物炼制。从不同行业产生的C1和C2气体也可以被各种微生物利用,这将有助于控制全球变暖。审查旨在通过几个角度扩大有关潜在应用的专业知识,影响补救的因素,问题,和前景。
    This review provides an update on the state-of-the art technologies for the valorization of solid waste and its mechanism to generate various bio-products. The organic content of these wastes can be easily utilized by the microbes and produce value-added compounds. Microbial fermentation techniques can be utilized for developing waste biorefinery processes. The utilization of lignocellulosic and plastics wastes for the generation of carbon sources for microbial utilization after pre-processing steps will make the process a multi-product biorefinery. The C1 and C2 gases generated from different industries could also be utilized by various microbes, and this will help to control global warming. The review seeks to expand expertise about the potential application through several perspectives, factors influencing remediation, issues, and prospects.
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  • 文章类型: Journal Article
    植酸盐(肌醇六磷酸盐)可以构成土壤中有机磷的很大一部分。作为土壤有机磷的一种更顽固的形式,每年在土壤中积累高达5100万吨的植酸盐,相当于磷肥施用量的65%。然而,植酸的可用性是有限的,由于其通过其高度磷酸化的肌醇结构与土壤的强结合,吸附能力是土壤中正磷酸盐的4倍。磷(P)是农业生产力中最具限制性的常量营养素之一。鉴于磷矿是一种有限的资源,加上其开采难度的增加和供应的地缘政治脆弱性,预计磷肥的经济和环境成本都将大大增加。因此,优化土壤植酸磷的使用可以潜在地提高农业生产的经济和环境可持续性。为了增加根际植酸磷的利用率,植物和微生物已经开发出通过分泌包括有机酸的动员剂和包括各种植酸酶的水解酶来改善植酸溶解度和矿化的策略。尽管我们对土壤中植酸盐的有效性和植酸酶活性有一些了解,20年前提出的植物获取植酸盐-P的限制步骤仍然难以捉摸。此外,植物和微生物来源的植酸酶的相对贡献,包括菌根,在提高植酸盐-P利用率方面知之甚少。因此,重要的是要了解影响植物获得植酸磷的过程,从而开发有效的分子生物学技术来增强土壤中植酸盐的动力学。然而,从实际的角度来看,植物获得的植酸磷与土壤固磷竞争,因此,必须从植物和土壤的角度评估植物获得稳定的植酸盐的能力。这里,我们总结了有关土壤中植酸盐有效性和植物获取植酸盐-P的信息。此外,讨论了提高植物对土壤植酸磷利用率的农艺方法和生物技术策略,并提出了需要进一步调查的问题。这些信息有助于更好地提高植物的植酸磷利用率,从而减少P资源投入和对更广泛环境的污染风险。
    Phytate (myo-inositol hexakisphosphate salts) can constitute a large fraction of the organic P in soils. As a more recalcitrant form of soil organic P, up to 51 million metric tons of phytate accumulate in soils annually, corresponding to ∼65% of the P fertilizer application. However, the availability of phytate is limited due to its strong binding to soils via its highly-phosphorylated inositol structure, with sorption capacity being ∼4 times that of orthophosphate in soils. Phosphorus (P) is one of the most limiting macronutrients for agricultural productivity. Given that phosphate rock is a finite resource, coupled with the increasing difficulty in its extraction and geopolitical fragility in supply, it is anticipated that both economic and environmental costs of P fertilizer will greatly increase. Therefore, optimizing the use of soil phytate-P can potentially enhance the economic and environmental sustainability of agriculture production. To increase phytate-P availability in the rhizosphere, plants and microbes have developed strategies to improve phytate solubility and mineralization by secreting mobilizing agents including organic acids and hydrolyzing enzymes including various phytases. Though we have some understanding of phytate availability and phytase activity in soils, the limiting steps for phytate-P acquisition by plants proposed two decades ago remain elusive. Besides, the relative contribution of plant- and microbe-derived phytases, including those from mycorrhizas, in improving phytate-P utilization is poorly understood. Hence, it is important to understand the processes that influence phytate-P acquisition by plants, thereby developing effective molecular biotechnologies to enhance the dynamics of phytate in soil. However, from a practical view, phytate-P acquisition by plants competes with soil P fixation, so the ability of plants to access stable phytate must be evaluated from both a plant and soil perspective. Here, we summarize information on phytate availability in soils and phytate-P acquisition by plants. In addition, agronomic approaches and biotechnological strategies to improve soil phytate-P utilization by plants are discussed, and questions that need further investigation are raised. The information helps to better improve phytate-P utilization by plants, thereby reducing P resource inputs and pollution risks to the wider environment.
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  • 文章类型: Journal Article
    微生物代谢物已被证明具有抑制食物腐败微生物群的作用,没有任何耐药性的发展。这篇综述提供了有关微生物代谢物对海鲜的防腐作用的最新文献。鱼和渔业产品被认为是无数的营养,同时极易变质。与使用合成防腐剂有关的几个已被证明的争议(抗微生物耐药性和健康问题)已经引起了迫在眉睫的问题。对最低限度加工和自然保存的干净标签鱼和渔业产品的需求正在增加。来自微生物的代谢物对鱼类和渔业产品腐败表现出不同的保存能力。包含其他保存技术,比如障碍技术,还总结了鱼类和渔业产品的保质期延长。
    Microbial metabolites have proven effects to inhibit food spoilage microbiota, without any development of antimicrobial resistance. This review provides a recent literature update on the preservative action of metabolites derived from microorganisms on seafood. Fish and fishery products are regarded as a myriad of nutrition, while being highly prone to spoilage. Several proven controversies (antimicrobial resistance and health issues) related to the use of synthetic preservatives have caused an imminent problem. The demand for minimally processed and naturally preserved clean-label fish and fishery products is on rise. Metabolites derived from microorganisms have exhibited diverse preservation capacities on fish and fishery products\' spoilage. Inclusions with other preservation techniques, such as hurdle technology, for the shelf-life extension of fish and fishery products are also summarized.
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