Types of Black Pepper Adulteration and How to Spot Them

Black pepper, one of the world’s most used spices, is prone to adulteration.

Why Does it happen?

Complex supply chains

The supply chains of black pepper tend to be long and complex. Black pepper passed through a lot of traders/processors before ending up in the consumer. The adulteration opportunities can occur at any stage of the supply chain.

Economically motivated adulteration

The price of black pepper tends to fluctuate. The fluctuation can cause traders to stockpile their black pepper and wait for an opportunity to sell at a higher price. This can cause a lack of supply of black pepper, then the price to surge. The high price and shortage of black pepper can be the motivation for adulteration.

Also, the price of black pepper tends to differ depending on the origin & the grade. A trader might do a blend or relabel poor-quality pepper as premium pepper to make more profit.

The availability of cheap substitute is also a cause of adulteration. Most of the substitute is the by-product of something, which is dirt cheap and almost tasteless. Most of those substitutes will be ground and mix with black pepper powder.

Adulterant in Black Pepper

Papaya seeds

The dried papaya seed resembles black pepper. Surprisingly, it also tastes like black pepper with some wasabi but lacks the peppery flavor.

It can either blend in with whole black pepper, or ground and mix with black pepper powder.

Papaya seeds can be allergic to some people. It is also harmful to the digestive system on a high dosage.

Spot papaya seed (whole black pepper): Payaya seed has low density, it floats on water whereas black pepper will sink to the bottom. Also, the papaya seed is oval shape whereas the black pepper is rounded.

Spot papaya (black pepper powder): ground papaya seed has a dark color whereas pure black pepper powder brown color.

Mineral Oil

Mineral oil coating on black pepper is used as a fungicide, polishing agent and to put on more weight. It is made of burnt diesel, paraffin oil, white petroleum and other un-digestible and insoluble petroleum products.

Mineral oil is harmful even in small quantities. It is carcinogenic, it can cause cancer.

Spot mineral oil on black pepper: Mineral oil may emit a kerosene-like smell. Put the black pepper in the water and stir to see if there is an oily film.

Light berries

Light berries are the berry that matures but failed to develop the seed inside. Some of them are totally seedless. They are low-grade pepper.

Spot light berries :

1. floats on the surface of the alcohol medium
2. easily crushed with fingers

Sawdust

Sawdust is a common adulterant in spice. It may cause digestive problems.

Spot sawdust in black pepper powder: It will float on the surface of the water.

Spent

Spent is the pepper waste after pressing the essential oils that lack the characteristic sharpness, taste, and smell, as well as waste from cleaning the pepper (branches, empty and rotting pea, stalk, stems, etc.).

Spot spent: If the pepper has an earthy-black or uniform dark gray color, then spent is added.

Flour/starch/ground husk

They are blended into the black pepper powder. Although they are considered to be safe, due to they can potentially alter the pure black pepper powder’s color, so dye may be used.

Rice flour tends to be the most common adulterant in pepper powder as it is cheap, safe, hardly detected and does not alter the taste of the ground pepper. It may alter the color of the pepper powder, usually mixed with black pepper powder to produce white pepper powder.

Spot Flour/starch/ground husk: They all have a high content of carbohydrates, so Benedict’s test may be used. Iodine can be used to test the presence of starch.