Predicting the suitability of microwave formulation using microwave differential thermal analysis (MWDTA)

Laura J. Waters, Shamsuddeen A. Ahmad, Gareth M. B. Parkes

Research output: Contribution to journalArticle

Abstract

Microwave-assisted formulation is becoming an established method of formulation in industry, providing a fast, economic and environmentally more favourable way to create products, such as those manufactured in the pharmaceutical industry. However, the effect of microwave-induced heating on a compound, or mixture of compounds, is yet to be fully explored, possibly indicating that this method of formulation may not be suitable in all cases. In this study, the effect of microwave heating was investigated through the application of microwave thermal analysis to six model pharmaceutical compounds and a set of four model excipients. Benzocaine, haloperidol, ibuprofen, indomethacin, ketoprofen and phenylbutazone were analysed, along with four excipients, namely β-cyclodextrin, d-mannitol, stearic acid and Syloid® XDP 3050 silica using microwave thermal analysis. Samples were heated by microwave irradiation at 5 °C min−1 to a minimum of 160 °C, held isothermally and then slowly cooled to room temperature. Thermal profiles were analysed and compared with data obtained using differential scanning calorimetry (DSC) and hot-stage microscopy (HSM). Overall, it was found that the process of microwave heating produced different thermal profiles to those seen using traditional, conductive heating. Investigating differences in thermal profiles can be a useful way to consider the effect of microwave-induced heating on formulations which can, in turn, help guide formulation choices.
Original languageEnglish
Number of pages10
JournalJournal of Thermal Analysis and Calorimetry
Early online date27 May 2019
DOIs
Publication statusE-pub ahead of print - 27 May 2019

Fingerprint

Differential thermal analysis
thermal analysis
Microwaves
formulations
microwaves
Microwave heating
Excipients
Heating
heating
Thermoanalysis
Benzocaine
Ketoprofen
Phenylbutazone
Microwave irradiation
Ibuprofen
Cyclodextrins
Mannitol
Haloperidol
profiles
Indomethacin

Cite this

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abstract = "Microwave-assisted formulation is becoming an established method of formulation in industry, providing a fast, economic and environmentally more favourable way to create products, such as those manufactured in the pharmaceutical industry. However, the effect of microwave-induced heating on a compound, or mixture of compounds, is yet to be fully explored, possibly indicating that this method of formulation may not be suitable in all cases. In this study, the effect of microwave heating was investigated through the application of microwave thermal analysis to six model pharmaceutical compounds and a set of four model excipients. Benzocaine, haloperidol, ibuprofen, indomethacin, ketoprofen and phenylbutazone were analysed, along with four excipients, namely β-cyclodextrin, d-mannitol, stearic acid and Syloid{\circledR} XDP 3050 silica using microwave thermal analysis. Samples were heated by microwave irradiation at 5 °C min−1 to a minimum of 160 °C, held isothermally and then slowly cooled to room temperature. Thermal profiles were analysed and compared with data obtained using differential scanning calorimetry (DSC) and hot-stage microscopy (HSM). Overall, it was found that the process of microwave heating produced different thermal profiles to those seen using traditional, conductive heating. Investigating differences in thermal profiles can be a useful way to consider the effect of microwave-induced heating on formulations which can, in turn, help guide formulation choices.",
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AB - Microwave-assisted formulation is becoming an established method of formulation in industry, providing a fast, economic and environmentally more favourable way to create products, such as those manufactured in the pharmaceutical industry. However, the effect of microwave-induced heating on a compound, or mixture of compounds, is yet to be fully explored, possibly indicating that this method of formulation may not be suitable in all cases. In this study, the effect of microwave heating was investigated through the application of microwave thermal analysis to six model pharmaceutical compounds and a set of four model excipients. Benzocaine, haloperidol, ibuprofen, indomethacin, ketoprofen and phenylbutazone were analysed, along with four excipients, namely β-cyclodextrin, d-mannitol, stearic acid and Syloid® XDP 3050 silica using microwave thermal analysis. Samples were heated by microwave irradiation at 5 °C min−1 to a minimum of 160 °C, held isothermally and then slowly cooled to room temperature. Thermal profiles were analysed and compared with data obtained using differential scanning calorimetry (DSC) and hot-stage microscopy (HSM). Overall, it was found that the process of microwave heating produced different thermal profiles to those seen using traditional, conductive heating. Investigating differences in thermal profiles can be a useful way to consider the effect of microwave-induced heating on formulations which can, in turn, help guide formulation choices.

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