Magnesium sulfate
[CAS# 10034-99-8]

Identification

• Classification: API >> Digestive system medication >> Laxative antidiarrheal
• Name: Magnesium sulfate
• Synonyms: Bitter salts; Epsom salts; Magnesium sulfate heptahydrate
• Molecular Formula: MgSO₄.7(H₂O)
• Molecular Weight: 246.47
• CAS Registry Number: 10034-99-8
• EC Number: 600-073-4
• SMILES: O.O.O.O.O.O.O.[O-]S(=O)(=O)[O-].[Mg+2]

Properties

• Solubility: Soluble (water)
• Density: 2.66
• Melting point: 1124 °C

Discovery and Applications

Magnesium sulfate, commonly known as Epsom salt, was discovered in the early 17th century in Epsom, England. The compound was first identified by Nehemiah Grew, an English physician and botanist, who noted that the bitter, saline spring waters in Epsom contained a unique salt that could be isolated through evaporation. This salt was later found to be a compound of magnesium and sulfur, leading to its naming as magnesium sulfate. The discovery of Epsom salt revolutionized medicine and agriculture, given its wide range of therapeutic and agricultural benefits. Today, magnesium sulfate is renowned for its diverse applications, from medical treatments to plant care.

Magnesium sulfate is widely used in medicine for its therapeutic properties. It is a critical treatment for eclampsia and pre-eclampsia in pregnant women, helping to prevent seizures by stabilizing blood pressure and reducing nerve excitability. It is also used as a laxative to relieve constipation and as an electrolyte replenisher in cases of magnesium deficiency. Intravenous magnesium sulfate is employed to manage certain cardiac arrhythmias and severe asthma attacks. Its muscle-relaxing properties make it a popular choice for managing acute muscle cramps and migraines. Additionally, Epsom salt baths are a common home remedy for muscle soreness and joint pain, providing symptomatic relief through transdermal absorption of magnesium.

In agriculture, magnesium sulfate serves as an essential fertilizer, supplying magnesium and sulfur, two crucial secondary nutrients for plant growth. Magnesium is a central component of chlorophyll, the molecule responsible for photosynthesis, while sulfur is vital for protein synthesis. Farmers and gardeners use magnesium sulfate to correct magnesium deficiencies in soil, which manifest as yellowing leaves and poor plant development. It is particularly beneficial for crops like tomatoes, peppers, and roses. The compound is often applied as a foliar spray or soil amendment to enhance nutrient uptake and promote healthy plant growth, leading to increased crop yields and improved plant health.

Beyond its medical and agricultural uses, magnesium sulfate finds applications in various industrial processes. It is used in the manufacture of textiles, paper, and ceramics, where it acts as a drying agent and additive. In the brewing industry, magnesium sulfate is added to brewing water to improve yeast fermentation and enhance beer flavor. It also plays a role in the production of certain chemicals and as a coagulant in the treatment of wastewater. Additionally, it is used in the preparation of magnesium sulfate heptahydrate, a common laboratory reagent.

Epsom salt is popular in personal care and wellness products. It is a common ingredient in bath salts, scrubs, and foot soaks, where it provides exfoliation and relaxation. Its anti-inflammatory properties make it effective for soothing minor skin irritations and insect bites. Magnesium sulfate also has applications in household cleaning, serving as a gentle abrasive for scrubbing tiles and grout.

References

2024. Separation of Magnesium by Fluorination from Zinc Sulfate Solution Through Surface Charge Control. Mining, Metallurgy & Exploration, 41(5).
DOI: 10.1007/s42461-024-01143-7

2024. Amino acids production using pineapple plant stem by optimised one-step fermentation. Chemical and Biological Technologies in Agriculture, 11(1).
DOI: 10.1186/s40538-024-00589-7

2024. Unveiling the potential of bacterial isolates from plastic-polluted environments: enhancement of polyhydroxybutyrate biodegradation. Biotechnology for the Environment, 1(1).
DOI: 10.1186/s44314-024-00009-y