查找使用阿拉丁产品的科研文献

Solubility Measurement and Hansen Solubility Parameter of Forchlorfenuron in 12 Organic Pure Solvents at Various Temperatures

Yueru Wang,Yidan Wu,Huimin Li,Yu Li,Tao Li,Baozeng Ren

In this work, the solubility of forchlorfenuron [N-(2-chloro-4-pyridinyl)-N′-phenylurea (CPPU)] in 12 selected pure solvents (n-pentanol, n-butanol, n-propanol, ethanol, methanol, ethyl acetate, n-propyl acetate, n-butyl acetate, i-propyl acetate, i-butyl acetate, i-amyl acetate, and acetone) was determined under the conditions of 0.1 MPa and 278.15–323.15 K using the laser detection method. The results indicate that the solubility of CPPU in the selected solvents is proportional to temperature. Five models (Two-Suffix Margules, NRTL, λh, Universal Quasi-Chemical, and the modified Apelblat) were selected to fit the solubility data of CPPU in pure solvents. By comparison, it is found that the modified Apelblat model has a better fitting effect. The solubility rules of CPPU in different solvents were analyzed using Hansen solubility parameters and polarity. The solvent effect of CPPU solubility in different solvents studied was discussed using the KAT-LSER model. The above studies can supply some primary data for the crystallization process of CPPU.

Chemiluminescence method based on the KIO4−K2CO3−Mn2+ reaction for rapid and sensitive determination of forchlorfenuron in dried fruit

Baisen Chen,Rongxia Tan,Yufei Hu,Gongke Li

Forchlorfenuron is a low-toxic phenylurea plant growth regulator. Excessive intake of forchlorfenuron can lead to metabolic disorders of the matrix and be harmful to human health. The chemiluminescence intensity of the KIO 4 –K 2 CO 3 –Mn 2+ reaction decreased in the presence of forchlorfenuron. Based on this result, a rapid and sensitive chemiluminescence method was established to determine forchlorfenuron by combining it with a batch injection static device. The injection speed, injection volume and reagent concentration of the forchlorfenuron–KIO 4 –K 2 CO 3 –Mn 2+ chemiluminescence reaction were optimized. Under these optimized conditions, the linear range of the method was 1.0–200.0 μg/L, and the limit of detection was 0.29 μg/L (S/N = 3). The chemiluminescence method for the determination of forchlorfenuron could be completed in 10 s. The method was applied to detect the residual forchlorfenuron in dried fruit samples, and the results are consistent with high-performance liquid chromatography-mass spectrometry. This method has the advantages of high sensitivity, rapid response, less reagent consumption, and convenient operation. It will provide a new perspective for chemiluminescence for the rapid and sensitive determination of forchlorfenuron in various complex samples.

Forchlorfenuron detection based on its inhibitory effect towards catalase immobilized on boron nitride substrate

Qin Xu,Lijuan Cai,Huijie Zhao,Jiaqian Tang,Yuanyuan Shen,Xiaoya Hu,Haibo Zeng

An enzymatic procedure based on a catalase biosensor for the detection of forchlorfenuron (CPPU) has been reported in this work. Catalase was immobilized on boron nitride (BN) sheets dispersed in chitosan by adsorption. The immobilized catalase exhibited direct electron transfer character and excellent electrocatalytic activity towards H 2 O 2 reduction. After introducing CPPU into the H 2 O 2 containing phosphate buffer solution , the catalase-catalyzed H 2 O 2 reduction current decreased. By measuring the current decrease, CPPU can be determined in the range of 0.5–10.0   µM with the detection limit of 0.07   μM. The non-competitive inhibition behavior of CPPU towards catalase was verified by the Lineweaver–Burk plots. Long stability character has been ascribed to this biosensor. Possible use of this biosensor in flow systems is illustrated. The proposed biosensor has been successfully applied to CPPU determination in fruits samples with satisfactory results.

Rapid analysis of forchlorfenuron in fruits using molecular complex-based dispersive liquid–liquid microextraction

Yanmei Ren,Ping Xiang,Qilong Xie,Haixiu Yang,Shuhui Liu

Solid-liquid equilibrium of forchlorfenuron in four binary solvents: Experiments, hansen solubility parameter and molecular simulation

Yueru Wang,Hansong Wang,Jiaxuan Chen,Bolun Mei,Yu Li,Tao Li,Baozeng Ren

In this research, the solubility of forchlorfenuron in 4 binary solvent systems {(methanol, ethanol, n-propanol and acetone) + water} was determined at certain experimental conditions (pressure of 101.3 kPa, temperature of 278.15 K-323.15 K) using laser dynamic monitoring method. Five thermodynamic models were applied to correlate and analyze the experimentally measured data. The modified Apelblat model has the lowest value of ARD (100 ARD  = 2.046 %) indicates that it fits best. The apparent thermodynamic properties during the dissolution process of forchlorfenuron in the four mixed solvent systems were explored using Van't Hoff equation. The effect of solvent properties on the dissolution was explored by calculating Hansen solubility parameters. For further understanding the solubility behavior on the molecular scale, molecular electrostatic potential analysis and Hirshfeld surface analysis were conducted to visualize the molecular surface charge distribution and predict the contact behavior between forchlorfenuron and solvent. Finally, the influence of intermolecular interactions between solute and solvent on solubility behavior was explored using radial distribution function analysis based on molecular dynamics simulations. And the results show the stronger intermolecular force corresponds to the larger solubility.

Imidazolium ionic-liquid-modified phenolic resin for solid-phase extraction of thidiazuron and forchlorfenuron from cucumbers

Pengfei Li,Yanke Lu,Jiangxue Cao,Mengyuan Li,Chunliu Yang,Hongyuan Yan

An imidazolium ionic-liquid-modified phenolic resin (ILPR) was synthesized using 3-aminophenol as a functional monomer, glyoxylic acid as a green cross-linker, and polyethylene glycol 6000 as a porogen. The obtained ILPR showed better extraction of benzoylurea plant hormones thidiazuron and forchlorfenuron than the unmodified phenolic resin because the imidazolium IL provides more interaction modes with the analytes. ILPR, as a tailored adsorbent for solid-phase extraction, was coupled with high-performance liquid chromatography (ILPR‒SPE‒HPLC) for the simultaneous determination of thidiazuron and forchlorfenuron in cucumbers. Good linearity of the ILPR‒SPE‒HPLC method was obtained, ranging from 0.0100 to 5.00 μg g −1 with a correlation coefficient ( r ) ≥ 0.9999. The recoveries of spiked samples ranged from 91.4% to 100.7% with a relative standard deviation of ≤ 6.0%.

Mesoporous Poly (Melamine–Formaldehyde) Resin as an Efficient Adsorbent for the Removal of Forchlorfenuron Pesticide from Water

Wang Tong,Yang AiGuo,Zhang JiuBing,Gan WeiJiang,Zhou Fan,Ran ZhaoJin,Wang ZhongMin

Pesticide residues in water can cause varying degrees of damage to the ecological system and human health, attracting widespread attention. During this research, a cost-effective, easily synthesized, and high surface area mesoporous poly (melamine–formaldehyde) (mPMF) was employed as an adsorbent to effectively absorb forchlorfenuron (CPPU) pesticide from water. The maximum adsorption capacity and maximum adsorption effectiveness were found to be 231.43 mg/g and 81%, respectively. The study of adsorption kinetics revealed that the adsorption mechanism conforms to a quasi-second-order kinetic model, indicating that chemical adsorption predominates, and the overall adsorption process is influenced by two or more factors. The adsorption isotherm experiment demonstrated that the adsorption mechanism is better described by the Freundlich model, suggesting that mPMF exhibits multi-layer heterogeneous adsorption of CPPU, involving both physical and chemical adsorption mechanisms. Additionally, mPMF showed the potential for cyclic regeneration through desorption after adsorbing CPPU from water, as its adsorption capacity remained largely unaffected even after four consecutive cycles.

Dissipation behavior, residue dynamics, and dietary risk assessment of forchlorfenuron in postharvest kiwifruits during simulated cold chain logistics and store shelf life

Zhu Difeng,Ping Li,Qian Renyun,Chen Chao,Hong Yawen,Tong Zhenxuan,Yang Xiaochun

Forchlorfenuron (CPPU) is often applied during the cultivation of kiwifruit to produce larger fruit. To address degradation patterns of CPPU during simulated cold chain logistics and simulated shelf life of the fruit after harvest, appropriate storage methods and safe consumption behavior can be investigated. In this study, an ultra-high-performance liquid chromatography-tandem mass spectrometry method was adopted to detect CPPU residues under different conditions. CPPU in kiwifruit stored at 6 °C had a half-life of 40.8–77.0 days. However, when kiwifruit was stored at 0 °C under simulated cold chain storage conditions, the half-life of CPPU was 63.0–115.5 days, implying that lower storage temperatures can reduce the degradation rate of CPPU. The residues of CPPU in kiwifruit pulp declined with time, and the reduction followed the first-order kinetics equation. More CPPU residues were present in the pulp of postharvest kiwifruit treated with exogenous ethylene than in the pulp of untreated kiwifruit. Thus, using exogenous ethylene for artificial ripening after harvest is not recommended. We determined that the appropriate cold chain storage temperature is 6 °C. It is recommended that the public select kiwifruit stored for at least 2 weeks. The estimated chronic and acute dietary risk quotients of CPPU are ≤ 0.79% and ≤ 0.11%, respectively. Therefore, it is highly unlikely that consumers will be poisoned by CPPU due to kiwifruit consumption. Our results provide scientific evidence regarding the adoption of appropriate kiwifruit storage methods and consumption behavior to enhance consumption safety.