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ArticlePharmaceutical research2026

Surfactant Regulation of the Solution-Mediated Phase Transformation of Nitrofurantoin Anhydrate to Monohydrate.

Zhuangzhuang Chen, Xiyan Wang, An Chen, Lin Li, Zhongting Zhuang, Minshan Guo, Ting Cai

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Article in Pharmaceutical research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

7 authors.

Zhuangzhuang ChenState Key Laboratory of Natural Medicines, Department of Pharmaceutics, College of Pharmacy, China Pharmaceutical University, Nanjing, 211198, China.
Xiyan WangState Key Laboratory of Natural Medicines, Department of Pharmaceutics, College of Pharmacy, China Pharmaceutical University, Nanjing, 211198, China.
An ChenDepartment of Pharmaceutical Engineering, School of Engineering, China Pharmaceutical University, Nanjing, 211198, China.
Lin LiDepartment of Pharmaceutical Engineering, School of Engineering, China Pharmaceutical University, Nanjing, 211198, China.
Zhongting ZhuangDepartment of Pharmaceutical Engineering, School of Engineering, China Pharmaceutical University, Nanjing, 211198, China.
Minshan GuoState Key Laboratory of Natural Medicines, Department of Pharmaceutics, College of Pharmacy, China Pharmaceutical University, Nanjing, 211198, China. 1020192584@cpu.edu.cn.
Ting CaiState Key Laboratory of Natural Medicines, Department of Pharmaceutics, College of Pharmacy, China Pharmaceutical University, Nanjing, 211198, China. tcai@cpu.edu.cn.ORCID http://orcid.org/0000-0001-7510-9295

Funding

Jiangsu Province Frontier Technology Research Program BF2024075Lingang Laboratory LGL-2613-03National Natural Science Foundation of China 22108313National Natural Science Foundation of China 22478439National Natural Science Foundation of China 22508422National Natural Science Foundation of China 82273880
6 · The paper itself

Abstract

purposeHydration of metastable anhydrates during dissolution can eliminate their supersaturation advantage and compromise formulation performance. This study used nitrofurantoin as a model system to clarify how surfactant molecular structure regulates solution-mediated phase transformation (SMPT) from anhydrate to monohydrate and supersaturation maintenance.

methodsSix surfactants, including SDS, DTAB, CTAB, STAB, Tween 20, and Tween 80, were evaluated by dissolution testing, solid-state characterization, crystallization kinetics, and molecular dynamics simulations.

resultsSurfactants inhibited SMPT in a structure-dependent manner, following the order Tween 80 > STAB > Tween 20 > CTAB > DTAB > SDS ≈ plain buffer. Longer hydrophobic chains more effectively delayed monohydrate nucleation and reduced crystal growth, whereas differences in head-group characteristics further modulated surface adsorption and inhibition among surfactants with comparable chain lengths. Molecular dynamics simulations suggested that stronger adsorption on monohydrate surfaces was associated with greater blockage of growth sites.

conclusionsThis study provides mechanistic insight into surfactant-regulated nitrofurantoin hydration, highlighting hydrophobic chain length and head-group characteristics as key structural factors governing surfactant adsorption and stabilization of the anhydrate during dissolution.

Indexed as

NitrofurantoinSurface-Active AgentsAdsorptionCrystallizationHydrophobic and Hydrophilic InteractionsMolecular Dynamics SimulationPhase TransitionSolubilitySolutionsNitrofurantoinSolutionsSurface-Active Agentsnitrofurantoin anhydratenucleation and crystal growthsolution-mediated phase transformationsupersaturation maintenancesurfactants

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.