Comparative Effects of Two Forms of Chitosan on Selected Phytochemical Properties of Plectranthus amboinicus (Lour.)

Abstract

In response to stress factors, plants produce a wide range of biologically active substances, from a group of secondary metabolites, which are applied in medicine and health prophylaxis. Chitosan is a well-known elicitor affecting secondary metabolism in plants, but its effect on the phytochemical profile of Plectranthus amboinicus has not been assessed yet. In the present experiment, the effectiveness of the foliar application of two forms of chitosan (chitosan suspension or chitosan lactate) was compared in order to evaluate their potential to induce the accumulation of selected polyphenolic compounds in the aboveground parts of P. amboinicus. It was shown that chitosan lactate had substantially higher elicitation efficiency, as the use of this form exerted a beneficial effect on the analysed quality parameters of the raw material, especially the content of selected polyphenolic compounds (total content of polyphenols, flavonols, anthocyanins, and caffeic acid derivatives) and the free radical-scavenging activity of extracts from elicited plants. Concurrently, it had no phytotoxic effects. Hence, chitosan lactate-based elicitation can be an effective method for optimisation of the production of high-quality P. amboinicus raw material characterised by an increased concentration of health-promoting and antioxidant compounds.

Extracted Eucalyptus globulus Bark Fiber as a Potential Substrate for Pinus radiata and Quillaja saponaria Germination

“…This observed behavior contrasts with Q. saponaria , where no significant differences were reported for all substrates ( Table 6 ). This outcome implies that the efficacy of specific phytostimulants for certain plant species may be due to their ability to induce particular defense responses and enhance the synthesis of secondary metabolites [ 71 , 72 ]. The effect of encapsulation was most relevant for the 75E-25M mixture, with an optimum concentration of 0.1%.…”

Green Extraction of Depsidones and Depsides from Hypogymnia physodes (L.) Nyl. Using Natural Deep Eutectic Solvents

“…The total phenolic content (TPC) in the acetone lichen extracts was determined using the Folin-Ciocalteau reagent (Merck, Darmstadt, Germany), following the method previously described by Stasi ńska-Jakubas et al [34] TPC values were expressed as the equivalent of mg of gallic acid (Merck, Darmstadt, Germany) per gram of lichen DW.…”

“…The method used to estimate the free radical-scavenging activity of the extracts was based on the synthetic free radical 1,1-diphenyl-2-picrylhydrazyl (DPPH, Merck, Darmstadt, Germany) [34]. The results for antioxidative capacity were expressed as the equivalent of mg Trolox (Merck, Darmstadt, Germany) per gram of lichen DW.…”

Health-promoting properties of Plectranthus amboinicus: a comprehensive review

“…ese compounds are mostly responsible for its characteristic aroma and therapeutic attributes [12][13][14]. Its leaves contain over 100 bioactive substances, including phenolic acids (e.g., rosmarinic acid, chlorogenic acid, ca eic acid, hydroxycinnamic acid, and p-coumaric acid), avonoids (including quercetin, luteolin, apigenin, and guanine), carotenoids, steroidal glycosides, alkaloids, saponins, tannins, and phytosterols [14][15][16].…”