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Davis, CA, United States

Sorribas A.,University of Hawaii at Manoa | Jimenez J.I.,AgraQuest | Yoshida W.Y.,University of Hawaii at Manoa | Williams P.G.,University of Hawaii at Manoa
Bioorganic and Medicinal Chemistry | Year: 2011

Bioassay-guided fractionation of an extract prepared from the fruiting bodies of a Daedalea sp. has led to the isolation of daedalols A-C (1-3). The structures of these new triterpenes were elucidated based on extensive NMR spectroscopic and mass spectrometric measurements. Assignment of the relative configuration of 3 required the preparation of a suitable derivative via a Payne rearrangement. The aspartic protease BACE1, an Alzheimer's drug target, was inhibited by 3 with an IC 50 value of 14.2 μM. © 2011 Elsevier Ltd. All rights reserved. Source

Corcuff R.,Laval University | Mercier J.,AgraQuest | Tweddell R.,Laval University | Arul J.,Laval University
Fungal Biology | Year: 2011

Muscodor albus (Xylariaceae, Ascomycetes) isolate CZ-620 produces antimicrobial volatile organic compounds (VOC), which appear to have potential for the control of various postharvest diseases. The effect of water activity (Aw) on the production of VOC by M. albus culture, and their inhibitory effects on the growth of three pathogens of potato tuber (Fusarium sambucinum, Helminthosporium solani, and Pectobacterium atrosepticum) and the development of diseases caused by the three pathogens (dry rot, silver scurf, and bacterial soft rot, respectively) were investigated. Rye grain culture of the fungus produced six alcohols, three aldehydes, five acids or esters, and two terpenoids. The most abundant VOC were: isobutyric acid; bulnesene, a sesquiterpene; an unidentified terpene; 2 and 3-methyl-1-butanol; and ethanol. However, the level of each of those VOC varied with Aw of the culture. Emission activity occurred mainly at Aw above 0.75 and high emission of most VOC occurred only at Aw above 0.90. The aldehydes (2-methyl-propanal and 3-methyl-butanal) were the only VOC produced in quantities below an Aw of 0.90. An Aw value of 0.96 favored maximum emission of acids, esters, and terpenoids. There was a higher production of alcohols and a decrease in aldehydes with increase in Aw. Isobutyric acid, which has been the main M. albus VOC monitored in previous studies as an indicator of antifungal activity, had a rather narrow optimum, peaking at Aw of 0.96 and declining sharply above 0.98. Results showed that substrate Aw affects the production dynamics of each group of VOC by the fungus, and suggest that VOC production can be prolonged by maintaining M. albus culture at a constant optimum Aw. The VOC was inhibitory to F. sambucinum, H. solani, and P. atrosepticum; and biofumigation with M. albus significantly reduced dry rot and soft rot development, and completely controlled silver scurf in inoculated tubers incubated at both 8 °C and 22 °C. The results show that Aw of grain culture affects the production of VOC by M. albus; and that the VOC inhibit the growth of the tested pathogens and the diseases caused by them in potato tubers. © 2010 The British Mycological Society. Source

The present invention relates to a method for enhancing the health of an animal comprising administering to the animal a composition comprising

AgraQuest | Date: 2010-11-04

Methods and compositions are provided for the preparation of insecticidal compositions.

AgraQuest | Date: 2012-11-02

A method for controlling nematodes in or on a plant, a plant part, and/or a locus for plant growth is provided, the method comprising applying to a plant, plant part, or locus for plant growth in need of protection from said nematodes an effective amount of

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