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Postharvest drying techniques regulate secondary metabolites and anti-neuroinflammatory activities of Ganoderma lucidum.

PMID: 

Molecules. 2021 Jul 25 ;26(15). Epub 2021 Jul 25. PMID: 34361637

Abstract Title: 

Postharvest Drying Techniques Regulate Secondary Metabolites and Anti-Neuroinflammatory Activities of.

Abstract: 

extract is a potent traditional remedy for curing various ailments. Drying is the most important postharvest step during the processing ofThe drying process mainly involves heat (36 h at 60°C) and freeze-drying (36 h at -80 °C). We investigated the effects of different postharvest drying protocols on the metabolites profiling ofusing GC-MS, followed by an investigation of the anti-neuroinflammatory potential in LPS-treated BV2 microglial cells. A total of 109 primary metabolites were detected from heat and freeze-dried samples. Primary metabolite profiling showed higher levels of amino acids (17.4%) and monosaccharides (8.8%) in the heat-dried extracts, whereas high levels of organic acids (64.1%) were present in the freeze-dried samples. The enzymatic activity, such as ATP-citrate synthase, pyruvate kinase, glyceraldehyde-3-phosphatase dehydrogenase, glutamine synthase, fructose-bisphosphate aldolase, and D-3-phosphoglycerate dehydrogenase, related to the reverse tricarboxylic acid cycle were significantly high in the heat-dried samples. We also observed a decreased phosphorylation level of the MAP kinase (Erk1/2, p38, and JNK) and NF-κB subunit p65 in the heat-dried samples of the BV2 microglia cells. The current study suggests that heat drying improves the production of ganoderic acids by the upregulation of TCA-related pathways, which, in turn, gives a significant reduction in the inflammatory response of LPS-induced BV2 cells. This may be attributed to the inhibition of NF-κB and MAP kinase signaling pathways in cells treated with heat-dried extracts.

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These results suggest that G. lucidum could be used as a source of strong natural antioxidants.

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