This volume includes five chapters that detail advances in chemistry research. Chapter 1 provides a comprehensive overview of food emulsions, with a focus on three key systems: (1) simple emulsions (O/W and W/O), (2) double emulsions (W/O/W and O/W/O), (3) and gelled emulsions. Chapter 2 reviews recent advances in the development of ionic liquid supported metal-oxide photocatalysts for the degradation of persistent organic pollutants, particularly textile dyes, in wastewater. Chapter 3 discusses the structural and physicochemical features of ZSM-5, its catalytic role in acyl transfer reactions, and the contributions of computational methodologies—from cluster to ONIOM and periodic models—in establishing structure–reactivity relationships and guiding the design of improved zeolitic catalysts. Chapter 4 gives insight into the occurrence, properties and usefulness of goethite, the mechanism, and parameters controlling the adsorption process. Finally, Chapter 5 compiles information and discusses advances in the use of alkaloids from various natural sources and their integration in medical applications.