• Archives of Pharmacal Research
• /
• v.26 no.1
• /
• pp.15-20
• /
• 2003

Two quinazolone alkaloids, (+)-febrifugine (1) and isofebrifugine (2), along with three coumarin derivatives, 6-hydroxy coumarin (3), skimmin (5), and $umbelliferone-7-O-{\alpha}-L-rhamnopyranosyl(1{\rightarrow}4)-{\beta}-D-glucopyranoside$ (6), were isolated from the roots of Hydrangea chinensis. Compound 6 is a new compound. In addition, umbelliferone (4), linoleic acid (7), two steroidal glycosides (8, 9), three furfural derivatives (10-12), and butyl-$\beta$-D-fructofuranoside (13) were isolated from the leaves of the same plant. The structures of all isolates were elucidated by spectral methods.

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2003.10b
• /
• pp.15-16
• /
• 2003

• Proceedings of the PSK Conference
• /
• 2000.04a
• /
• pp.188.1-188.1
• /
• 2000

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 1995.01a
• /
• pp.42-42
• /
• 1995

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 1993.08a
• /
• pp.24-30
• /
• 1993

• Food Science of Animal Resources
• /
• v.36 no.4
• /
• pp.547-557
• /
• 2016

This review discusses the status, antimicrobial mechanisms, application, and regulation of natural preservatives in livestock food systems. Conventional preservatives are synthetic chemical substances including nitrates/nitrites, sulfites, sodium benzoate, propyl gallate, and potassium sorbate. The use of artificial preservatives is being reconsidered because of concerns relating to headache, allergies, and cancer. As the demand for biopreservation in food systems has increased, new natural antimicrobial compounds of various origins are being developed, including plant-derived products (polyphenolics, essential oils, plant antimicrobial peptides (pAMPs)), animal-derived products (lysozymes, lactoperoxidase, lactoferrin, ovotransferrin, antimicrobial peptide (AMP), chitosan and others), and microbial metabolites (nisin, natamycin, pullulan, ε-polylysine, organic acid, and others). These natural preservatives act by inhibiting microbial cell walls/membranes, DNA/RNA replication and transcription, protein synthesis, and metabolism. Natural preservatives have been recognized for their safety; however, these substances can influence color, smell, and toxicity in large amounts while being effective as a food preservative. Therefore, to evaluate the safety and toxicity of natural preservatives, various trials including combinations of other substances or different food preservation systems, and capsulation have been performed. Natamycin and nisin are currently the only natural preservatives being regulated, and other natural preservatives will have to be legally regulated before their widespread use.

• Natural Product Sciences
• /
• v.4 no.1
• /
• pp.45-50
• /
• 1998

Seven triterpenoid saponins such as oleanolic acid 28-O-{\beta}-D-glucopyranosyl$ ester, hederagenin $28-O-{\beta}-D-glucopyranosyl$ ester, chikusetsusaponin IVa, udosaponin A, salsoloside C, udosaponins F and C were isolated from the aerial parts of Aralia continentalis, among which two $28-O-{\beta}-D-glucopyranosyl$ esters of oleanolic acid and hederagenin are isolated for the first tome from this plant. These results suggested that the chemical components of Korean Dokwhal are practically identical to those of japanese Udo supporting the chemotaxonomical point of view.

• Natural Product Sciences
• /
• v.6 no.2
• /
• pp.102-105
• /
• 2000

Chemical investigation of the hot hexane extract of the stem bark of Gordonia dassanayakei afforded a new oleanane triterpenoid, $11{\alpha},13{\beta}-dihydroxyolean-3,12-dione$ (1) and two other oleanane triterpenoids, $3{\beta}-acetoxy-11{\alpha},13{\beta}-dihydroxyolean-12-one\;(2)\;and\;3{\beta},11{\alpha}-diacetoxy-13{\beta}-hydroxyolean-12-one\;(3)\;and\;a\;hopane\;6{\alpha},22-diol$ (4), which are new to the plant.

• YAKHAK HOEJI
• /
• v.20 no.3
• /
• pp.138-144
• /
• 1976

In previous communications$^{1-6)}$, the results of the preliminary phytochemical examinatioins of 261 plant samples which have been used in medicine in Korea were reported. In continuation of this program we now present in Table I the results of chemical examination of another 92 species, belonging to 80 genera nad 48 families, which were screened for the presence of alkaloids, saponins, terpenoids, and flavonoids. The list of folk medicines described by Lee$^{7)}$ was used as a guide in the selection of plants to be tested.

• Korean Journal of Pharmacognosy
• /
• v.21 no.2
• /
• pp.126-129
• /
• 1990

Platelet anti-aggregating activities were evaluated with three combined crude drug preparations which have been used for 'eahyul'-one of the pathological concept in oriental medicine presumably concerning blood stasis or stagnant syndrome. The water extract of each combined preparation and each component plant was tested for their effects against ADP, arachidonic acid (AA) or collagen induced rat platelet aggregations. Mild inhibitory activities were observed with all the three tested preparations, Kaechibokryung-Hwan, Dangkqijakyak-San and Ohnkyung-Tang, and the component plants which are included in at least two of the above preparations.