1-Naphthylacetic acid slow release polymeric formulations: auxin type effect in tobacco leaf segments is affected by structure and hydrolysis

Tsatsakis, Aristidis; Paritsis, K. N.; Shtilman, Mikhail I.; Shashkova, I. B.; Alegakis, Athanasios; Roubelakis‐Angelakis, Kalliopi A.

doi:10.1007/bf00024177

Cited by 13 publications

(9 citation statements)

References 15 publications

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“…Figure 7(B) shows that temperature had great influence on the hydrolysis rates, increasing from 0.042 mg days −1 at 20 °C to 0.507 mg days −1 at 60°C. It was previously found that hydrolysis at room temperature and in the pH range 4–7 was negligible,8 and this was confirmed by the results of hydrolysis at 20°C, pH 7.1 [Figure 7(B)]. Higher temperatures provided higher energies for bond dissociation and thus facilitated the hydrolysis of PBMHs‐NAA 35.…”

Section: Results and Notessupporting

confidence: 71%

“…The hydrolysis rate at alkaline pH values was much higher than that at acidic pH values, simply because of the greater availability of OH − , which could neutralize the released NAA and promote hydrolysis 8, 11, 12. This result also demonstrated that hydrolysis rate of PBMHs‐NAA was higher in acidic condition than in neutral condition, and this was verified in other publication 8. Figure 7(B) shows that temperature had great influence on the hydrolysis rates, increasing from 0.042 mg days −1 at 20 °C to 0.507 mg days −1 at 60°C.…”

Section: Results and Notesmentioning

confidence: 99%

“…The hydrolysis rate constant at pH 9.0 was 0.308 mg days −1 , calculated from the slope of a plot of the mass of NAA released against time, compared to 0.160 mg days −1 at pH 4.2 and 0.144 mg days −1 at pH 7.1 [Figure 8(A)]. The hydrolysis rate at alkaline pH values was much higher than that at acidic pH values, simply because of the greater availability of OH − , which could neutralize the released NAA and promote hydrolysis 8, 11, 12. This result also demonstrated that hydrolysis rate of PBMHs‐NAA was higher in acidic condition than in neutral condition, and this was verified in other publication 8.…”

Section: Results and Notesmentioning

confidence: 99%

“…One of the biological shortcomings in the application of PGRs is the very narrow concentration, ranging over which PGRs are effective. The response is characterized by a sharp rise and drop in biological activity, moving on to a negative response with a further increase of PGR, and appearance of herbicide‐like effects 8…”

Section: Introductionmentioning

confidence: 99%

“…NAA was loaded in a matrix of an inorganic Zn–Al‐layered double‐hydroxide using a self‐assembly technique, and the mechanism of controlled release was interpreted on the basis of the ion‐exchange process between the NAA anions intercalated in the lamellar host and nitrate/hydroxyl anions in the aqueous solution 9. However, the mechanism of hydrolysis of esters of NAA for its sustained release has drawn more attention because the polymeric derivatives are biologically active after releasing NAA by hydrolysis, and their effectiveness is longer than that of NAA 8–13. The sustained‐release periods of NAA esters ranged from months to years, depending on the types and structures of the copolymers 9–12…”

Section: Introductionmentioning

confidence: 99%

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1‐naphthylacetic‐acid‐functionalized polyacrylate‐coated urea with dual controlled‐release properties

Qiu

Zhu

Tao

et al. 2012

J of Applied Polymer Sci

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Esters derived from 1‐naphthylacetic acid (NAA) and polyacrylate were synthesized and a dual controlled‐release formulation was developed by coating fertilizers with these esters. FT‐IR, 1H NMR, TGA, and DSC were used to characterize the synthesized polymers, and the mechanical properties were also tested. Urea granules were coated with NAA esters, and the release rates of urea from the coated granules in water were measured. NAA release from the esters was performed in different buffer solutions and in soil. The results showed that the coated fertilizers were able to release urea in a controlled pattern and that NAA could be slowly released from membranes of the esters in both buffer solutions and in soil through hydrolysis. The coated fertilizer's availability could last more than 28 days and that of NAA could last more than 12 months, which suggested that the prepared CRF possessed dual controlled‐release of urea and NAA. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Section: Results and Notessupporting

confidence: 71%

Section: Results and Notesmentioning

confidence: 99%

Section: Results and Notesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

1‐naphthylacetic‐acid‐functionalized polyacrylate‐coated urea with dual controlled‐release properties

Qiu

Zhu

Tao

et al. 2012

J of Applied Polymer Sci

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Synthesis and Characterization of Poly(Biphenyl‐2‐yl p‐Styrenesulphonate) as Profungicide in Controlled Release Technique

Khazaei

Soudbar²,

Sadri

et al. 2007

J Chinese Chemical Soc

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A new fungicide controlled release formulation was prepared by the reaction of p-styrenesulphonyl chloride with biphenyl-2-ol (Dowicide A) as fungicide. The resulting monomer containing the fungicide was polymerized with benzoyl peroxide as initiator. The monomer and the polymer were identified by spectroscopic methods, and molecular weight of the polymer was determined by GPC. Also mp, Tg and Td of the polymer were identified by DSC. The release characteristic of the polymer was studied in neutral, alkaline, and acidic media. Also, the effect of the temperature on the release of bioactive agent (Dowicide A) was investigated. The hydrolysis data showed that the release rates are strongly dependent upon the pH of the medium and the temperature.

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Precisely controlled delivery of plant hormone using poly(vinyl alcohol)/zeolite A hydrofilm composite

Viboonratanasri

Thongdee

Prajuabsuk

et al. 2021

Polymer Engineering & Sci

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Programmable release of a plant hormone, 1‐naphthylacetic acid (NAA), could be achieved by using a novel zeolite–hydrofilm (ZHF) composite. The ZHF was prepared using poly(vinyl alcohol) and glutaraldehyde as a cross‐linking agent with the addition of different amounts of zeolite A (0, 1.5, 2.0, 2.5, and 3.0 wt%). This reveals that ZHF was formed as a phase‐separated microcomposite with chemical interactions between zeolite A and polymer matrix. We found that the composite film with 2.5 wt% zeolite A had the largest pore size, which exhibited the highest water absorbency and the longest water retention time of over 7 h with high thermal and mechanical stabilities. Release profile displayed rapid desorption of NAA from the film at the initial stage, followed by sustained release thereafter. This behavior was explained by the Korsmeyer–Peppas model with a predominant mechanism of simple Fickian diffusion. Additionally, ZHF with NAA could effectively enhance adventitious root formation of Ocimum basilicum Linn. (sweet basil) cuttings due to accurate releasing NAA and time duration for releasing plant hormone. Finally, the NAA released at the film surface could be in a controlled manner with less negative impact on plant and environment.

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1-Naphthylacetic acid slow release polymeric formulations: auxin type effect in tobacco leaf segments is affected by structure and hydrolysis

Cited by 13 publications

References 15 publications

1‐naphthylacetic‐acid‐functionalized polyacrylate‐coated urea with dual controlled‐release properties

1‐naphthylacetic‐acid‐functionalized polyacrylate‐coated urea with dual controlled‐release properties

Synthesis and Characterization of Poly(Biphenyl‐2‐yl p‐Styrenesulphonate) as Profungicide in Controlled Release Technique

Precisely controlled delivery of plant hormone using poly(vinyl alcohol)/zeolite A hydrofilm composite

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