Phenolic compounds arise from the shikimic and acetic acid (polyketide) metabolic pathways in plants. They are but one category of the many secondary metabolites implicated in plant allelopathy. Phenolic allelochemicals have been observed in both natural and managed ecosystems, where they cause a number of ecological and economic problems, such as declines in crop yield due to soil sickness, regeneration failure of natural forests, and replanting problems in orchards. Phenolic allelochemical structures and modes of action are diverse and may offer potential lead compounds for the development of future herbicides or pesticides. This article reviews allelopathic effects, analysis methods, and allelopathic mechanisms underlying the activity of plant phenolic compounds. Additionally, the currently debated topic in plant allelopathy of whether catechin and 8-hydroxyquinoline play an important role in Centaurea maculata and Centaurea diffusa invasion success is discussed. Overall, the main purpose of this review is to highlight the allelopacthic potential of phenolic compounds to provide us with methods to solve various ecology problems, especially in regard to the sustainable development of agriculture, forestry, nature resources and environment conservation.

https://www.mdpi.com/1420-3049/15/12/8933/pdf

Phenolics and plant allelopathy.

Strategies for the determination of bioactive phenols in plants, fruit and vegetables

Analytical chemistry of fruit bioflavonoids. A review.

Natural product isolation

Natural products have contributed to the development of many drugs for diverse indications. While most U.S. pharmaceutical companies have reduced or eliminated their in-house natural product groups, new paradigms and new enterprises have evolved to carry on a role for natural products in the pharmaceutical industry. Many of the reasons for the decline in popularity of natural products are being addressed by the development of new techniques for screening and production. This overview aims to inform pharmacologists of current strategies and techniques that make natural products a viable strategic choice for inclusion in drug discovery programs.

/pdf/natural-products-as-a-foundation-for-drug-discovery-52zi1ofhbe.pdf

Natural Products as a Foundation for Drug Discovery

Introduction.- Sample Preparation and Purification.- Planar Chromatography.- Special Column Chromatography.- Preparative Pressure Liquid Chromatography.- Preparative Gas Chromatography.- Countercurrent Chromatography.- Separation of Macromolecules.- Separation of Chiral Molecules.- Separation Strategy and Combination of Methods.- Subject Index.

Preparative Chromatography Techniques: Applications in Natural Product Isolation

Inevitably, reading is one of the requirements to be undergone. To improve the performance and quality, someone needs to have something new every day. It will suggest you to have more inspirations, then. However, the needs of inspirations will make you searching for some sources. Even from the other people experience, internet, and many books. Books and internet are the recommended media to help you improving your quality and performance.

Preparative Chromatography Techniques

On-line high-performance liquid chromatography : Ultraviolet-visible spectroscopy of phenolic compounds in plant extracts using post-column derivatization

Purification of natural products and the fractionation of crude plant extracts are processes which traditionally involve adsorption and/or molecular exclusion chromatography. While countercurrent chromatography avoids the irreversible adsorption and decomposition frequently encountered in adsorption chromatography, the classical countercurrent distribution technique is both time- and solvent-consuming, consequently it is of limited value today. Rotation locular countercurrent chromatography (RLCC) is one of three new countercurrent techniques, the others being droplet contercurrent chromatography (DCCC)1 and planet coil countercurrent chromatography (PCCCC)2, which have revived the chromatographic application of liquid-liquid partition. We have employed a commercially available RLCC apparatus in the isolation of several natural products with a broad range of polarity demonstrating the versatility of the RLCC with regard to the functionality of the compounds to be isolated.

Applications of Rotation Locular Countercurrent Chromatography in Natural Products Isolation

Isolation of natural products by droplet counter-current chromatography and related methods

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