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Essential oils from the leaf and twig of Polyalthia suberosa (Roxb.) Thwaites were analyzed using GC/MS/FID. A total of sixty‐three constituents were namely identified accounting for 96.03 and 94.12 % in the hydrodistilled oils of the leaf and twig, respectively. Monoterpenes, monoterpenoids, sesquiterpenes, and sesquiterpenoids were characteristic derivatives of P. suberosa essential oils. Sesquiterpenes bicyclogermacrene (26.26 %) and (E)‐caryophyllene (7.79 %), and monoterpene β‐pinene (12.71 %) were the major constituents of the leaf oil. Sesquiterpenes (E)‐caryophyllene (17.17 %) and α‐humulene (9.55 %), sesquiterpenoid caryophyllene oxide (9.41 %), and monoterpenes camphene (8.16 %) and tricyclene (6.35 %) were to be main components in the twig oil. The leaf oil indicated cytotoxic activity against three cancer cell lines HepG2, MCF7 and A549 with the IC50 values of 60.96–69.93 μg/mL, while the twig oil inhibited MCF7 with the IC50 value of 66.70 μg/mL. Additionally, the twig oil successfully suppressed the growth of the negative Gram bacterium Pseudomonas aeruginosa, fungus Aspergillus niger, and yeast Candida albicans with the same MIC value of 50 μg/mL, whereas the leaf oil had the same result on the negative Gram bacterium Escherichia coli.
Essential oils from the leaf and twig of Polyalthia suberosa (Roxb.) Thwaites were analyzed using GC/MS/FID. A total of sixty‐three constituents were namely identified accounting for 96.03 and 94.12 % in the hydrodistilled oils of the leaf and twig, respectively. Monoterpenes, monoterpenoids, sesquiterpenes, and sesquiterpenoids were characteristic derivatives of P. suberosa essential oils. Sesquiterpenes bicyclogermacrene (26.26 %) and (E)‐caryophyllene (7.79 %), and monoterpene β‐pinene (12.71 %) were the major constituents of the leaf oil. Sesquiterpenes (E)‐caryophyllene (17.17 %) and α‐humulene (9.55 %), sesquiterpenoid caryophyllene oxide (9.41 %), and monoterpenes camphene (8.16 %) and tricyclene (6.35 %) were to be main components in the twig oil. The leaf oil indicated cytotoxic activity against three cancer cell lines HepG2, MCF7 and A549 with the IC50 values of 60.96–69.93 μg/mL, while the twig oil inhibited MCF7 with the IC50 value of 66.70 μg/mL. Additionally, the twig oil successfully suppressed the growth of the negative Gram bacterium Pseudomonas aeruginosa, fungus Aspergillus niger, and yeast Candida albicans with the same MIC value of 50 μg/mL, whereas the leaf oil had the same result on the negative Gram bacterium Escherichia coli.
A new racemic xanthone, garmckeanin A (1), and eight known analogs 2–9 were isolated from the ethyl acetate (AcOEt) extract of the Vietnamese Garcinia mckeaniana leaves. Their structures were determined by MS and NMR spectral analyses and compared with the literature. The AcOEt extract showed good cytotoxicity against cancer cell lines KB, Lu, Hep‐G2 and MCF7, with IC50 values of 5.40–8.76 μg/mL, and it also possessed α‐glucosidase inhibitory activity, with an IC50 value of 9.17 μg/mL. Garmckeanin A (1) exhibited inhibition of all cancer cell lines, with an IC50 value of 7.3–0.9 μM. Allanxanthone C (5) successfully controlled KB growth, with an IC50 value of 0.54 μM, higher than that of the positive control, ellipticine (IC50 1.22 μM). Norathyriol (8) was a promising α‐glucosidase inhibitor, with an IC50 value of 0.07 μM, much higher than that of the positive control, acarbose (IC50 161.0 μM). The interactions of the potential α‐glucosidase inhibitors with the C‐ and N‐terminal domains of human intestinal α‐glucosidase were also investigated by molecular docking study. The results indicated that bannaxanthone D (2), garcinone E (4), bannaxanthone E (6), and norathyriol (8) exhibit higher binding affinity to the C‐terminal than to the N‐terminal domain through essential residues in the active sites. In particular, compound 8 could be assumed to be the most potent mixed inhibitor.
The genus Diospyros has gained significant attention in the scientific community owing to its diverse bioactivities ascribed to specific bioactive constituents present in different species of this plant. Phytochemicals like flavonoids, terpenoids, and xanthones have been reported to be present in other Diospyros species responsible for their pharmacological properties. These compounds are well known for their diverse potent therapeutic potentials, such as antimicrobial, antioxidant, anti‐inflammatory, and anticancer properties. This review enlightens the details of the Genus Diospyros, ranging from an overview of its species to an in‐depth analysis of phytochemistry, ethnopharmacology, and their potential as anticancer agents. Different species, including Diospyros lotus, Diospyros kaki, Diospyros maritima, Diospyros mespiliformis, and Diospyros tricolor, presented with an enormous range of anticancer activities against human cancer cell cultures. Moreover, this review highlights the results of various in vitro (antiproliferative, cytotoxic effects against), in vivo (inhibition of tumor, apoptosis), and in silico (GLU234, GLU278, and LYS158 protein residues) studies, elucidating its preclinical anticancer potential. The anticancer potential displays inhibition of cellular proliferation, induction of apoptosis, and mitigation of angiogenesis. Furthermore, this review may elaborate the use of traditional knowledge, modern research, and potential therapeutic applications in the field of anticancer ethnopharmacology. As the modern‐day research approaches novel alternatives to combat diseases like cancer, the Genus Diospyros may emerge as a promising avenue with the potential to yield innovative and effective therapeutic agents.
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