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Food grade Zinc sulfate monohydrate 7446-19-7

Synonyms: Zinc sulfate monohydrate
Molecular Formula: ZnSO4·H2O
Molecular Weight: 181.47
Hazard Class:Class 9
HS Code: 2833293000
Grade:Food grade 96、98%

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Model:
7446-19-7
Brand:
futurechem
Code:
7446-19-7

Product Description

What is Zinc Sulfate Monohydrate?

Chemical identity

project	information
Chinese name	Zinc sulfate monohydrate
English name	Zinc sulfate monohydrate
Molecular formula	ZnSO₄·H₂O
molecular weight	179.49
CAS number	7446-19-7
Appearance	White, free-flowing powder or granules, odorless
Solubility	Very soluble in water (aqueous solution is weakly acidic), slightly soluble in ethanol

Zinc sulfate family – Monohydrate vs. Heptahydrate

Zinc sulfate comes in two common food-grade forms:

form	Molecular formula	CAS	Zinc content	Appearance	Applications in food fortification
Monohydrate (the main character in this article)	ZnSO₄·H₂O	7446-19-7	~36%	White powder	The preferred form for flour and grain fortification – high zinc density, less prone to clumping.
heptahydrate	ZnSO₄·7H₂O	7446-20-0	~22%	Colorless or white crystals	High moisture content – prone to clumping in dry powder foods; low zinc content – high fortification costs.

Complete Uses of Food-Grade Zinc Sulfate Monohydrate

1. Zinc fortification of staple food flour and grains – the primary application

This is the sector with the largest global consumption of food-grade zinc sulfate.

reinforcement strategy	Zinc addition (as Zn)	Zinc source
WHO Recommendation - Flour Fortification	30~70 mg/kg flour	ZnSO₄·H₂O is the preferred choice, while ZnO is an alternative.
US CSB/WSB Rescue Food	50~80 mg/kg product	ZnSO₄·H₂O (USDA Designated)
China GB 14880 - Flour	≤ 80 mg/kg (permissible range)	ZnSO₄ or ZnO or zinc lactate

Zinc sulfate vs. zinc oxide: The battle between the two major zinc sources in flour fortification

There are two main options for zinc fortification: zinc oxide (ZnO, insoluble in water, white) and zinc sulfate (ZnSO₄, soluble in water). The WHO's position is that zinc sulfate is the preferred option, while zinc oxide is an alternative.

contrast	Zinc sulfate monohydrate	Zinc oxide
Zinc content	~36%	~80%
Water-soluble	High – Zn²⁺ direct free release	Insoluble – It needs to dissolve in stomach acid before it can be absorbed.
Bioavailability	high	Medium (depending on stomach acid levels and particle size)
Sensitivity to phytic acid	Sensitive – Phytic acid in whole wheat flour can chelate Zn²⁺, reducing its absorption.	Relatively insensitive (gradual dissolution and release)
Effects on food color	None (white)	None (white)
cost	Low (higher than ZnO)	lowest

2. Infant formula – Refined zinc supplementation

Infants and young children have a need for zinc throughout their rapid growth period—zinc is an essential cofactor for DNA synthesis and cell division. Zinc fortification in infant formula and rice cereal usually uses zinc sulfate as the inorganic zinc source (sometimes combined with organic zinc such as zinc lactate or zinc gluconate to enhance the "natural" image of premium products).

3. Compound Vitamin and Mineral Tablets

Among various multi-element tablets, zinc sulfate is the most common inorganic zinc source—because:

● White – does not alter the appearance of the tablet;

● High zinc content—one tablet contains 5-15 mg of zinc, requiring only tens of milligrams of zinc sulfate;

● It is physically compatible with other minerals (calcium, magnesium, iron) in solid tablets.

4. Dietary supplements and sports nutrition

Zinc sulfate is a standard source of zinc in protein powders, meal replacement powders, and sports nutrition products. Its solubility ensures that zinc ions are evenly distributed in the liquid after preparation, unlike zinc oxide which tends to settle at the bottom.

Summarize

Zinc Sulfate Monohydrate (CAS 7446-19-7) is the most fundamental building block in the global food zinc fortification supply chain:

Scene	What did it do?
North American flour mills	Sprinkled into tons of flour—making every slice of toast a zinc carrier.
African aid food	Precisely weighed into the CSB formula—adding a boost of zinc to the growth of malnourished children.
Infant formula factory	The chemical starting point for the first gram of zinc in life, added to the mineral premix of infant formula.
Sports nutrition can	Dissolve it in protein powder—so every smoothie after a weightlifting session contains zinc.

It doesn't pursue taste (that's the track for zinc lactate and zinc gluconate), nor does it pursue the highest zinc content (that's the track for zinc oxide), but it pursues covering the largest population at the lowest cost on the scale with the greatest impact on human nutrition—global staple food fortification.