Molasses, or black treacle (British, for human consumption; known as molasses otherwise), is a viscous product resulting from refining sugarcane or sugar beets into sugar. Molasses varies by amount of sugar, method of extraction, and age of plant. Sugarcane molasses is agreeable in taste and aroma, and is primarily used for sweetening and flavoring foods in the United States, Canada, and elsewhere, while sugar beet molasses is foul-smelling and unpalatable, so it is mainly used as an animal feed additive in Europe and Russia, where it is chiefly produced. Molasses is a defining component of fine commercial brown sugar.
Sweet sorghum syrup may be colloquially called "sorghum molasses" in the southern United States. Similar products include treacle, honey, maple syrup, corn syrup, and invert syrup. Most of these alternative syrups have milder flavors.
To make molasses, sugar cane is harvested and stripped of leaves. Its juice is extracted, usually by cutting, crushing, or mashing. The juice is boiled to concentrate it, promoting sugar crystallization. The result of this first boiling is called first syrup, and it has the highest sugar content. First syrup is usually referred to in the Southern states of the United States as cane syrup, as opposed to molasses. Second molasses is created from a second boiling and sugar extraction, and has a slightly bitter taste.
The third boiling of the sugar syrup yields dark, viscous blackstrap molasses, known for its robust flavor. The majority of sucrose from the original juice has crystallized and been removed. The caloric content of blackstrap molasses is mostly due to the small remaining sugar content.
Unlike highly refined sugars, it contains significant amounts of vitamin B6 and minerals, including calcium, magnesium, iron, and manganese; one tablespoon provides up to 20% of the recommended daily value of each of those nutrients. Blackstrap is also a good source of potassium. Blackstrap molasses has long been sold as a dietary supplement.
The exaggerated health benefits sometimes claimed for blackstrap molasses were the topic of a 1951 novelty song, Black Strap Molasses, recorded by Groucho Marx, Jimmy Durante, Jane Wyman, and Danny Kaye.
Sugar beet molasses
Molasses made from sugar beets differs from sugarcane molasses. Only the syrup left from the final crystallization stage is called molasses. Intermediate syrups are called high green and low green, and these are recycled within the crystallization plant to maximize extraction. Beet molasses is 50% sugar by dry weight, predominantly sucrose, but contains significant amounts of glucose and fructose. Beet molasses is limited in biotin (vitamin H or B7) for cell growth; hence, it may be supplemented with a biotin source. The nonsugar content includes many salts, such as calcium, potassium, oxalate, and chloride. It contains betaine and the trisaccharide raffinose. These are a result of concentration from the original plant material or chemicals in processing, and make it unpalatable to humans. So, it is mainly used as an additive to animal feed (called "molassed sugar beet feed") or as a fermentation feedstock.
Extracting additional sugar from beet molasses is possible through molasses desugarization. This exploits industrial-scale chromatography to separate sucrose from non-sugar components. The technique is economically viable in trade-protected areas, where the price of sugar is supported above market price. As such, it is practiced in the U.S. and parts of Europe. Molasses is also used for yeast production.
Many kinds of molasses on the market come branded as "unsulphured". Many foods, including molasses, were once treated with sulfur dioxide as a preservative, helping to kill off molds and bacteria. Sulfur dioxide is also used as a bleaching agent, and helped to lighten the color of molasses. Most brands have veered away from sulphured molasses, due to the relatively stable natural shelf life of untreated molasses, the off flavor and trace toxicity of low doses of sulfur dioxide.
Food products and additives
Molasses can be used:
- In dark rye breads or other whole grain breads
- In some cookies and pies
- In gingerbread (particularly in the Americas)
- In barbecue sauces
- In beer styles such as stouts and porters
- To stabilize emulsification of home-made vinaigrette 
- The principal ingredient in the distillation of rum
- As a humectant in jerky processing
- An iron supplement
- An additive in livestock feeds
- An ingredient in fishing groundbait
- A source for yeast production
- The main ingredient in the production of citric acid
- An additive in tobacco smoked in a hookah, shisha, or narghile (found in the brands The King, Al Fakher Tobacco, Cedars Tobacco, Mazaya, Nakhla, Tangiers, Salloum, and Hookafina Blak)
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- The carbon source for in situ remediation of chlorinated hydrocarbons
- Blended with magnesium chloride and used for de-icing
- A stock for ethanol fermentation to produce an alternative fuel for motor vehicles
- As a brightener in copper electroforming solution when used in tandem with thiourea
- As a minor component of mortar for brickwork
- Mixed with glue to case ink rollers on early printing presses
- As a soil additive to promote microbial activity
- As a potato plant cicatrizant after a hail storm
|Nutritional value per 100 g (3.5 oz)|
|Energy||1,213 kJ (290 kcal)|
|Dietary fiber||0 g|
|Pantothenic acid (B5)||
|Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database
Molasses is composed of 22% water, 75% carbohydrates, and no protein or fat (table). In a 100 gram reference amount, molasses is a rich source (20% or more of the Daily Value, DV) of vitamin B6 and several dietary minerals, including manganese, magnesium, iron, potassium, and calcium (table).
The sugars in molasses are sucrose (29% of total carbohydrates), glucose (12%) and fructose (13%) (data from USDA nutrition table).
- Anadama bread
- Brown sugar
- Great Molasses Flood
- Maillard reaction
- Shoofly pie
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