Phenolic Compounds from Japanese Anise (Illicium anisatum L.) Leaves

Shinn, Seong-whan; Min, Hee-Jeong; Bae, Young-Soo

doi:10.5658/wood.2019.47.1.1

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…When hexane extracts of the leaves from the host plant, I. anisatum, were analyzed by GC-MS, no compounds identical to those of the nymph extracts were detected, except for hydrocarbons. Furthermore, no previous papers on the components of I. anisatum leaves have described compounds detected in nymph extracts [25][26][27][28]. Thus, compounds 1-10 were suggested to be exocrine secretions from nymphs.…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Activity of Defensive Secretions from the Lace Bug Stephanitis svensoni (Drake) (Hemiptera: Tingidae)

Shimizu,

Takahara,

Ogami

2024

Insects

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Nymphs of Stephanitis svensoni (Drake) (Hemiptera: Tingidae) have numerous glandular setae on their dorsal abdomens. Chemical analysis of the exudates from these setae revealed the presence of 11 compounds, including aliphatic aldehydes, aliphatic ketones, and aromatic polyketides. Among them, 3-oxododecanal, 5-hydroxy-2-heptylchromanone, and 5-hydroxy-2-undecanylchromanone were identified for the first time in the family Tingidae. Previous research has suggested that secretions from nymphs of the genus Stephanitis, belonging to the family Tingidae, function as defensive substances against predators. The exudates of S. svensoni showed antibacterial activity against the Gram-positive bacterium Staphylococcus aureus. Antibacterial tests conducted using preparations of the 10 identified compounds showed antibacterial activity in 3-oxododecanal, 2,6-dihydroxyacetophenone, and 1-(2,6-dihydroxyphenyl)dodecan-1-one. In addition, antibacterial tests against the Gram-negative bacterium Escherichia coli showed activity in 2,6-dihydroxyacetophenone and 1-(2,6-dihydroxyphenyl)dodecan-1-one. Therefore, 2,6-dihydroxyacetophenone and 1-(2,6-dihydroxyphenyl)dodecan-1-one exhibited a wide antibacterial spectrum. Particularly, 1-(2,6-dihydroxyphenyl)dodecan-1-one, which showed antibacterial activity even at low concentrations, holds promise as lead drug compound.

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Section: Resultsmentioning

confidence: 99%

Antibacterial Activity of Defensive Secretions from the Lace Bug Stephanitis svensoni (Drake) (Hemiptera: Tingidae)

Shimizu,

Takahara,

Ogami

2024

Insects

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Suspended resting of caterpillars as an anti‐predator strategy

Matsubara,

Sugiura

2024

Ecological Entomology

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Resting animals are highly vulnerable to predation, making the location and manner in which they rest crucial for their survival. Some lepidopteran larvae and spiders rest while suspended in the air at night. Although previous studies have hypothesised that nocturnal suspended resting serves as an anti‐predator defence, this hypothesis has not yet been tested. We found that Pogonopygia nigralbata larvae (Lepidoptera: Geometridae: Ennominae) rest on leaves of the host plant Illicium anisatum (Austrobaileyales: Schisandraceae) during the day but hang from leaves by a thread at night. As some predators, such as praying mantises, centipedes and tree frogs, were observed on host plants at night, the larvae might hang from leaves to avoid encounters with these predators. To test this hypothesis, we artificially placed model prey (i.e., live mealworms) on I. anisatum trees during the day and at night. We compared the attack rates on model prey suspended from leaves with those directly attached to the leaves. Model prey were attacked more frequently during the day than at night. Suspended models were attacked less frequently than those attached leaves at night. A mealworm attached to a leaf was also consumed by a centipede at night. Additionally, centipedes were found more frequently on the host plant I. anisatum at night than during the day. Furthermore, our laboratory experiments showed that P. nigralbata larvae were frequently consumed by praying mantises and centipedes. Our results suggest that the nocturnal suspended resting of P. nigralbata larvae plays a crucial role in evading nocturnal predators, such as praying mantises and centipedes.

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Antidiabetic Activities of Korean Red Pine (Pinus densiflora) Inner Bark Extracts

Min¹,

Kim²,

Shinn³

et al. 2019

Journal of the Korean Wood Science and Technology

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This study was carried out to investigate the potential of Korean red pine (Pinus densiflora) inner bark extracts as an antidiabetic agent. The ethyl acetate soluble fraction of the bark extracts was chromatographed on a Sephadex LH-20 column to yield five compounds, which structures were elucidated by NMR spectroscopy. The isolated compounds were (+)-catehin, (−)-epicatechin, taxifolin, taxifolin-3'-O-β-D-(+)-glucose and ñ-courmaric acid. The antidiabetic activity of the different fractions, including the crude extracts and isolated compounds, was evaluated by β-cells insulin secretion and glucose uptake in skeletal muscle cells. The insulin secretion was 128%for taxifolin at 25 µg/mL. However, the other samples had no effect on this test. For the glucose uptake activity assay, 1 µM insulin and 2 mM metformin were used as controls. Both the crude extract and taxifolin showed relatively low activity values, but the other samples yielded glucose uptake values over 260%. ρ-courmaric acid showed the highest uptake (270%). The results confirmed that Korean red pine extracts may be used as a hypoglycemic agent.

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Phenolic Compounds from Japanese Anise (Illicium anisatum L.) Leaves

Cited by 3 publications

References 19 publications

Antibacterial Activity of Defensive Secretions from the Lace Bug Stephanitis svensoni (Drake) (Hemiptera: Tingidae)

Antibacterial Activity of Defensive Secretions from the Lace Bug Stephanitis svensoni (Drake) (Hemiptera: Tingidae)

Suspended resting of caterpillars as an anti‐predator strategy

Antidiabetic Activities of Korean Red Pine (Pinus densiflora) Inner Bark Extracts

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