Synthesis of Gold Nanoparticles Capped-Benzoic Acid Derivative Compounds (o-, m-, and p-Hydroxybenzoic Acid)

The effect of a hydroxyl functional group of the benzoic acid derivative compound, i.e. o-hydroxybenzoic acid, m-hydroxybenzoic acid, and p-hydroxybenzoic acid on the synthesis of AuNPs has been studied. It was revealed that the pH, heating time, the concentration of capping agent and the concentration of Au3+ affected the formation of AuNPs. We discovered that o-hydroxybenzoic acid possessed the highest stability, yet it needed the highest concentration of Au3+ and faster reaction time than p-hydroxybenzoic acid and slower than m-hydroxybenzoic acid. The stability was verified by means of UV-Vis spectrophotometer, XRD, TEM, Particle Size Analyzer (PSA), and Zeta Potential with an aging time of more than 5 months. We concluded that o-hydroxybenzoic acid acquired the most effective redox reaction instead of m-hydroxybenzoic acid and p-hydroxybenzoic acid, resulted in the smaller sized and unaggregated AuNPs. We also confirmed that the hydroxyl group of o-hydroxybenzoic acid, m-hydroxybenzoic acid and p-hydroxybenzoic acid is the functional group responsible for the reduction of Au3+ to Au0.

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Myrsicorianol, A New Prenylated Benzoic Acid Derivative from Myrsine Coriacea

Natural Product Communications ◽

10.1177/1934578x0800300304 ◽

2008 ◽

Vol 3 (3) ◽

pp. 1934578X0800300

Author(s):

Juan Manuel Amaro-Luis ◽

Sonia Koteich-Khatib ◽

Freddy Carrillo-Rodríguez ◽

Alí Bahsas

Keyword(s):

Spectral Analysis ◽

Benzoic Acid ◽

Acid Derivative ◽

2D Nmr ◽

Hydroxybenzoic Acid ◽

Benzoic Acid Derivative ◽

Methoxybenzoic Acid

A new prenylated benzoic acid derivative, named myrsicorianol (1), was isolated from the fruits of Myrsine coriacea and its structure was determined by spectral analysis, including 1D- and 2D-NMR experiments. Myrsinoic acid A and a mixture of the p-benzoquinones, embelin, rapanone and 2,5-dihydroxy-3-pentadecyl-1,4-benzoquinone (homorapanone) were also obtained from the fruits, whilst the bark afforded myrsinoic acid A, myrsinoic acid B, 3-(3′,7′-dimethyl-2′,6′-octadienyl)-4-hydroxybenzoic acid and 3-(3′,7′-dimethyl-2′,6′-octadienyl)-4-methoxybenzoic acid.

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Important Considerations for RPA 201772 Utility

Weed Technology ◽

10.1017/s0890037x00042275 ◽

1999 ◽

Vol 13 (4) ◽

pp. 814-820 ◽

Cited By ~ 8

Author(s):

Christy L. Sprague ◽

Donald Penner ◽

James J. Kells

Keyword(s):

Benzoic Acid ◽

Acid Derivative ◽

Herbicidal Activity ◽

Laboratory Studies ◽

Corn Hybrids ◽

Benzoic Acid Derivative ◽

Rate Dependent ◽

Low Levels ◽

The Stability ◽

Over Time

Greenhouse and laboratory studies were conducted to examine certain characteristics of RPA 201772 and how they may affect its utility.14C-RPA 201772 was used to determine the stability of RPA 201772 in various pH spray solutions over time. After 24 h, degradation of RPA 201772 was 20, 36, and 93% in spray solutions adjusted to pH 4.0, 7.0, and 10.0, respectively. The major metabolite was diketonitrile (DKN), which is herbicidally active. In addition, 9 and 15% of the RPA 201772 had degraded into an inactive benzoic acid derivative at pH 7.0 and 10.0, respectively. The differences in herbicidal activity of RPA 201772 and its metabolite DKN were also evaluated. Corn seeds and velvetleaf seeds readily imbibed RPA 201772, but only low levels of DKN were imbibed. Preemergence (applications of RPA 201772 and DKN were equally active on corn and velvetleaf. Further studies determined that the principal sites of uptake of RPA 201772 by corn was roots and seeds for four different corn hybrids. Another study determined that light was required for RPA 201772 activity. Corn shoots from seeds germinated under 14 h of light exhibited rate-dependent injury, while corn germinated and grown in the darkness was not injured.

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