1
|
Kim J, Yu H, Yang E, Choi Y, Chang PS. Effects of alkyl chain length on the interfacial, antibacterial, and antioxidative properties of erythorbyl fatty acid esters. Lebensm Wiss Technol 2023. [DOI: 10.1016/j.lwt.2022.114421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
2
|
Najafi Z, Kamari‐aliabadi A, Sabourian R, Hajimahmoodi M, Chehardoli G. Synthesis and molecular modeling of new 2‐benzylidenethiobarbituric acid derivatives as potent tyrosinase inhibitors agents. J CHIN CHEM SOC-TAIP 2022. [DOI: 10.1002/jccs.202100537] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Zahra Najafi
- Department of Medicinal Chemistry School of Pharmacy, Hamadan University of Medical Sciences Hamadan Iran
| | - Adel Kamari‐aliabadi
- Department of Medicinal Chemistry School of Pharmacy, Hamadan University of Medical Sciences Hamadan Iran
| | - Reyhaneh Sabourian
- Drug and Food Control Department, Faculty of Pharmacy Tehran University of Medical Sciences Tehran Iran
| | - Mannan Hajimahmoodi
- Drug and Food Control Department, Faculty of Pharmacy Tehran University of Medical Sciences Tehran Iran
| | - Gholamabbas Chehardoli
- Department of Medicinal Chemistry, School of Pharmacy, Medicinal Plants and Natural Products Research Center Hamadan University of Medical Sciences Hamadan Iran
| |
Collapse
|
3
|
Zhang S, Akoh CC. Enzymatic synthesis of 1-o-galloylglycerol: Characterization and determination of its antioxidant properties. Food Chem 2020; 305:125479. [DOI: 10.1016/j.foodchem.2019.125479] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 08/28/2019] [Accepted: 09/03/2019] [Indexed: 10/26/2022]
|
4
|
Marathe SJ, Shah NN, Singhal RS. Enzymatic synthesis of fatty acid esters of trehalose: Process optimization, characterization of the esters and evaluation of their bioactivities. Bioorg Chem 2020; 94:103460. [DOI: 10.1016/j.bioorg.2019.103460] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 01/08/2023]
|
5
|
Ellison CM, Piechota P, Madden JC, Enoch SJ, Cronin MTD. Adverse Outcome Pathway (AOP) Informed Modeling of Aquatic Toxicology: QSARs, Read-Across, and Interspecies Verification of Modes of Action. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:3995-4007. [PMID: 26889772 DOI: 10.1021/acs.est.5b05918] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Alternative approaches have been promoted to reduce the number of vertebrate and invertebrate animals required for the assessment of the potential of compounds to cause harm to the aquatic environment. A key philosophy in the development of alternatives is a greater understanding of the relevant adverse outcome pathway (AOP). One alternative method is the fish embryo toxicity (FET) assay. Although the trends in potency have been shown to be equivalent in embryo and adult assays, a detailed mechanistic analysis of the toxicity data has yet to be performed; such analysis is vital for a full understanding of the AOP. The research presented herein used an updated implementation of the Verhaar scheme to categorize compounds into AOP-informed categories. These were then used in mechanistic (quantitative) structure-activity relationship ((Q)SAR) analysis to show that the descriptors governing the distinct mechanisms of acute fish toxicity are capable of modeling data from the FET assay. The results show that compounds do appear to exhibit the same mechanisms of toxicity across life stages. Thus, this mechanistic analysis supports the argument that the FET assay is a suitable alternative testing strategy for the specified mechanisms and that understanding the AOPs is useful for toxicity prediction across test systems.
Collapse
Affiliation(s)
- Claire M Ellison
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University , Byrom Street, Liverpool, L3 3AF England
| | - Przemyslaw Piechota
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University , Byrom Street, Liverpool, L3 3AF England
| | - Judith C Madden
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University , Byrom Street, Liverpool, L3 3AF England
| | - Steven J Enoch
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University , Byrom Street, Liverpool, L3 3AF England
| | - Mark T D Cronin
- School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University , Byrom Street, Liverpool, L3 3AF England
| |
Collapse
|
6
|
Uddin MH, Nanzai B, Okitsu K. Effects of Na2SO4 or NaCl on sonochemical degradation of phenolic compounds in an aqueous solution under Ar: Positive and negative effects induced by the presence of salts. ULTRASONICS SONOCHEMISTRY 2016; 28:144-149. [PMID: 26384893 DOI: 10.1016/j.ultsonch.2015.06.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/26/2015] [Accepted: 06/27/2015] [Indexed: 06/05/2023]
Abstract
Sonochemical degradation of 4-chlorophenol, phenol, catechol and resorcinol was studied under Ar at 200 kHz in the absence and presence of Na2SO4 or NaCl. The rates of sonochemical degradation in the absence of salts decreased in the order 4-chlorophenol>phenol>catechol>resorcinol and this order was in good agreement with the order of log P (partition coefficient) value of each phenolic compound. The effects of salts on the rates of sonochemical degradation consisted of no effect or slight negative or positive effects. We discussed these unclear results based on two viewpoints: one was based on the changes in pseudo hydrophobicity and/or diffusion behavior of phenolic compounds and the other was based on the changes in solubility of Ar gas. The measured log P value of each phenolic compound slightly increased with increasing salt concentration. In addition, the dynamic surface tension for 4-chlorophenol aqueous solution in the absence and presence of Na2SO4 or NaCl suggested that phenolic compounds more easily accumulated at the interface region of bubbles at higher salt concentration. These results indicated that the rates of sonochemical degradation should be enhanced by the addition of salts. On the other hand, the calculated Ar gas solubility was confirmed to decrease with increasing salt concentration. The yield of H2O2 formed in the presence of Na2SO4 or NaCl decreased with increasing salt concentration. These results suggested that sonochemical efficiency decreased with decreasing gas amount in aqueous solution: a negative effect of salts was observed. Because negative and positive effects were induced simultaneously, we concluded that the effects of salts on the rates of sonochemical degradation of phenolic compounds became unclear. The products formed from sonochemical degradation of 4-chlorophenol were also characterized by HPLC analysis. The formation of phenol and 4-chloro-1,3-dihydroxy benzene was confirmed and these concentrations were affected by the presence of salts.
Collapse
Affiliation(s)
- Md Helal Uddin
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan; Depertment of Applied Chemistry and Chemical Technology, Faculty of Applied Science and Technology, Islamic University, Kushtia 7003, Bangladesh
| | - Ben Nanzai
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Kenji Okitsu
- Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
| |
Collapse
|
7
|
Bala V, Rao S, Li P, Wang S, Prestidge CA. Lipophilic Prodrugs of SN38: Synthesis and in Vitro Characterization toward Oral Chemotherapy. Mol Pharm 2015; 13:287-94. [DOI: 10.1021/acs.molpharmaceut.5b00785] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Vaskor Bala
- School of Pharmacy and Medical
Sciences, University of South Australia, Adelaide, SA 5001, Australia
| | - Shasha Rao
- School of Pharmacy and Medical
Sciences, University of South Australia, Adelaide, SA 5001, Australia
| | - Peng Li
- School of Pharmacy and Medical
Sciences, University of South Australia, Adelaide, SA 5001, Australia
| | - Shudong Wang
- School of Pharmacy and Medical
Sciences, University of South Australia, Adelaide, SA 5001, Australia
| | - Clive A. Prestidge
- School of Pharmacy and Medical
Sciences, University of South Australia, Adelaide, SA 5001, Australia
| |
Collapse
|
8
|
Eadsforth C, Adams C, Austin T, Corry T, Forbes S, Harris S. Validation of an HPLC Method for Determining logPowValues of Surfactants. TENSIDE SURFACT DET 2014. [DOI: 10.3139/113.110303] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
9
|
Ledbetter MR, Gutsell S, Hodges G, O'Connor S, Madden JC, Rowe PH, Cronin MTD. Prediction of immobilised artificial membrane chromatography retention factors using theoretical molecular fragments and structural features. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2013; 24:661-678. [PMID: 23724974 DOI: 10.1080/1062936x.2013.792872] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Many in silico alternatives to aquatic toxicity tests rely on hydrophobicity-based quantitative structure-activity relationships (QSARs). Hydrophobicity is often estimated as log P, where P is the octanol-water partition coefficient. Immobilised artificial membrane (IAM) high performance liquid chromatography (HPLC) may be a more biologically relevant alternative to log P. The aim of this study was to investigate the applicability of a theoretical structural fragment and feature-based method to predict log k IAM (the logarithm of the retention index determined by IAM-HPLC) values. This will allow the prediction of log k IAM based on chemical structure alone. The use of structural fragment values to predict log P was first proposed in the 1970s. The application of a similar method using fragment values to predict log k IAM is a novel approach. Values of log k IAM were determined for 22 aliphatic and 42 aromatic compounds using an optimised and robust IAM-HPLC assay. The method developed shows good predictive performance using leave-one-out cross validation and application to an external validation set not seen a priori by the training set also generated good predictive values. The ability to predict log k IAM without the need for practical measurement will allow for the increased use of QSARs based on this descriptor.
Collapse
Affiliation(s)
- M R Ledbetter
- School of Pharmacy and Chemistry, Liverpool John Moores University, United Kingdom.
| | | | | | | | | | | | | |
Collapse
|
10
|
Miller DJ, McWilliams P. Nonionic Surfactants: Octanol-Water Partition Coefficients with the Slow Stirring/Surface Tension Method. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.110173] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
LogP values for several nonionic surfactants were measured by the slow stirring/surface tension method. Aqueous surfactant solution is equilibrated with octanol. A surface tension technique is used to determine the concentration in the aqueous phase. Interference from octanol, which is surface active, is prevented by evaporation and re-dissolution of the sample. The effect of initial concentration on the observed logP value is discussed. Above a certain concentration the amount of surfactant in the aqueous phase exceeds the critical micelle concentration (cmc). In this region logP appears to decrease markedly with initial concentration. Using a simple model, which includes the effect of octanol on the cmc, the apparent logP can be corrected for this micellisation effect. With a tristyrylphenol ethoxylate the concentrations in aqueous and octanol phases were determined by UV absorption, giving a logP value in good agreement with the surface tension method. For a series of commercial undecyl ethoxylates, the logP value was found to decrease with increasing length of the EO chain. Products with more than 4 EO have a logP less than 3, indicating that they are unlikely to bioaccumulate.
Collapse
|
11
|
Roberts DW, Roberts JF, Hodges G, Gutsell S, Ward RS, Llewellyn C. Aquatic toxicity of cationic surfactants to Daphnia magna. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2013; 24:417-27. [PMID: 23557108 DOI: 10.1080/1062936x.2013.781538] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Quantitative structure-activity relationship (QSAR) modelling of aquatic toxicity for cationic surfactants has received limited attention despite the fact that surfactants of this type are generally more toxic than predicted by general narcosis or polar narcosis equations. Here we report measurement of log P for three types of aromatic quaternary ammonium halides at sub-micellar concentrations, refinement of earlier rules for log P calculation, and development of a hydrophobicity based QSAR, using both calculated and measured log P values, for the aquatic toxicity of quaternary ammonium halides to Daphnia magna. The QSAR for cationics has a substantially larger intercept than the log P-based QSARs for nonionic and anionic surfactants. This is rationalised in terms of the head group interactions with membrane phospholipid in a two-dimensional partitioning model. The effect of the positive nitrogen on the log P contributions of methylene groups along alkyl chains varies, depending on the other groups bonded to the positive nitrogen. We propose a mechanistic explanation, but until these effects can be put on a more predictable quantitative basis it is recommended that, for quaternaries other than the three types discussed here, calculated log P values should not be relied on and experimental values should be determined, e.g. for prediction of toxicity by the QSAR equation reported here.
Collapse
|
12
|
Sarkar P, Luchowski R, Raut S, Sabnis N, Remaley A, Lacko AG, Thamake S, Gryczynski Z, Gryczynski I. Studies on solvatochromic properties of aminophenylstyryl-quinolinum dye, LDS 798, and its application in studying submicron lipid based structure. Biophys Chem 2010; 153:61-9. [DOI: 10.1016/j.bpc.2010.10.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Accepted: 10/04/2010] [Indexed: 10/19/2022]
|