BIOLOGICALLY ACTIVE NATURAL PRODUCTS: AGROCHEMICALS - CHAPTER 20 doc

... A-2, B-2, A-1, and B-1, while total avenacins included active avenacins and mono-dG-A-1 which has some residual fungi- cidal activity. The concentrations of avenacins A-1, B-1, and A-2 were greater ... mono-dG-A1 (Figure 20. 3). Yields of A-1 and A-2 are approximately 10 times higher with the improved extraction procedure, while yields of B-1 are approxi- mately 2 times higher. Decreased B...

Ngày tải lên: 11/08/2014, 12:21

... silica gel using hex- ane-EtOAc, mixtures of increasing polarity consisting of four kaurenoid carboxylic acids: (–)-kaur-16-en-19-oic acid (28), (–)-grandifloric acid, (–)-angeloylgrandifloric ... acids: (–)-kaur-16-en-19-oic acid (28), (–)-grandifloric acid, (–)-angeloylgrandifloric acid (29), and the (– )-1 7-hydroxy-16β-kauran-19-oic acid (30) (Figure 2.7). In general, clear inhibitory effec...

Ngày tải lên: 11/08/2014, 12:21

... sim- ilar in appearance to a good Pilsner beer. This F-2-p fraction contains native plant enzymes as well as salts, soluble carbohydrates, and other water solubles. The F-1-protein concen- trate ... spray-drying of the basic solution. Fraction-2-proteins are recovered by adjusting the pH of the pale amber solution to 4.5 followed by cooling to 5-1 0°C for 24 h. As in the case of F-1-p, this...

Ngày tải lên: 11/08/2014, 12:21

... allowed to solidify. Solutions of test compounds (6-pentyl-2H-pyran-2-one (I), 4-methyl-6-pentyl-2H-pyran-2-one (VII), or 4,6-dimethyl-2H-pyran-2-one (VIII)) were prepared in acetone and applied ... Press LLC 6-pentyl-2H-pyran-2-one is complex. Understanding its mode of action may prove more challenging than one might anticipate, if indeed 6-pentyl-2H-pyran-2-one is the physiolog- ically rel...

Ngày tải lên: 11/08/2014, 12:21

... 2-( 4-dichlorophenoxy) phe- noxy-methyl propanoate, Hoelon ® , 1974; Butyl 2-[ 4-( 5-trifluoro-2-pyridyloxy)phenoxy] propionate, Fusilade ® , 1980; Methyl 2-( 4-( (3-chloro-5-trifluoromethyl )-2 -pyridinyloxy )- phenoxy) ... ajmaline, serpentine, and serpertinine. 3-5 Of these, reserpine, 11,17α-dimethyoxy-18 -[ (3,4,5-trimethoxybenzoyl) oxy ]-3 β, 20 -yohimban-1 6- -...

Ngày tải lên: 11/08/2014, 12:21

... confirmed its association with L-3,4-dihy- droxyphenylalanine (L-DOPA). It is well known that velvetbean seeds contain a high con- centration of L-DOPA (6 to 9%), 20, 21 which plays a role as a ... 32 1-3 25. 19. Fujii, Y., Shibuya, T., and Yasuda, T. 1991. L-3,4-dihydroxyphenylalanine as an allelochemical candidate from Mucuna pruriens (L.) DC. var. utilis. Agr. Biol. Chem., 55, 61 7-6...

Ngày tải lên: 11/08/2014, 12:21

... hyperoside, quercetin 4 - -xyloside, 3-methylquercetin 3 - -xyloside 19 Dienoic, trienoic, and tetraenoic acids 20 α-aminoadipic acid 21 β-sitosterol, gallic acid, 1-hexacosanol 22 Nupharin, ... gallic acid, myricitrin, myricetin, 1,2,3,4,6-pentagalloyl- D-glucose, and 2,3,4,6-tetragalloyl-D-glucose. Examination of alkaloids from N. lutea showed 6,6′-dihydroxythiobinupharidine to be hi...

Ngày tải lên: 11/08/2014, 12:21

... derivatized to yield the herbicides dicamba (3,6-dichloro- 2-methoxybenzoic acid) and chloramben (3-amino-2,5-dichlorobenzoic acid). The allelo- pathic terpenoid 1,8-cineole has served as a model for the ... has not yet been released. 1 4-1 6 5.2 Tree-of-Heaven (Ailanthus altissima) Tree-of-heaven (Ailanthus altissima, Simaroubaceae) has been known since the work of Mer- gen in 1959 to prod...

Ngày tải lên: 11/08/2014, 12:21

... natural compounds: (24R )-1 4α-methyl-5α-ergostan-3-one; 14α-methyl-5α-cholestan-3-one; cycloart-5-ene- 3β,25-diol; cycloart-3β,25-diol; 4α-methylergostan-5-ene-3β-ol; stigmast-4,22-dien-6β-ol- 3- one ... stigmast-4,22-dien-6β-ol- 3- one and 24-phenylethyl-cholest-3,6-dione were identified; together with several known compounds: (24R)-stigmast-4-ene-3-one; ergost-4-ene-3-one; (24R)-s...

Ngày tải lên: 11/08/2014, 12:21

... ana- logs [(± )-1 9b, -1 9c, -1 9d, -2 0a, -2 0b, -2 0c, and -2 0d] of 2, could be synthesized from (± )-1 8a-d (Scheme 8.4). 22 In principle, this method would be applied to synthesize the optically active form. 23,24 ... (Koto fresh K -2 0) 1/1000 c 15 (±)-CA 10 6 (+ )-( 1S,2S)-CA 5 6–7 (– )-( 1R,2R)-CA 5 6 (±)-AlloCA 10 8–10 (±)-AlloCA b 10 10–11 (+ )-( 1R,2...

Ngày tải lên: 11/08/2014, 12:21