Black Pepper: Medicinal Use and Trade

As medicine

‘There’s certainly too much pepper in that soup!’ Alice said to herself, as well as she could for sneezing. — Alice in Wonderland (1865). Chapter VI: Pig and Pepper. Note the cook’s pepper mill. Like many eastern spices, pepper was historically both a seasoning and a medicine. Long pepper, being stronger, was often the preferred medication, but both were used.

Black Pepper (or perhaps long pepper) was believed to cure illness such as constipation, diarrhoea, earache, gangrene, heart disease, hernia, hoarseness, indigestion, insect bites, insomnia, joint pain, liver problems, lung disease, oral abscesses, sunburn, tooth decay, and toothaches. Various sources from the 5th century onward also recommend pepper to treat eye problems, often by applying salves or poultices made with pepper directly to the eye.

There is no current medical evidence that any of these treatments has any benefit; pepper applied directly to the eye would be quite uncomfortable and possibly damaging. Nevertheless, Black pepper either powdered or its decoction is widely used in traditional Indian medicine and as a home remedy for relief from sore throat, throat congestion, cough etc.

Pepper is known to cause sneezing. Some sources say that piperine, a substance present in black pepper, irritates the nostrils, causing the sneezing; few, if any, controlled studies have been carried out to answer the question. It has been shown that piperine can dramatically increase absorption of selenium, vitamin B, beta-carotene and curcumin as well as other nutrients.

As a medicine, pepper appears in the Buddhist Samannaphala Sutta, chapter five, as one of the few medicines allowed to be carried by a monk.

Pepper contains small amounts of safrole, a mildly carcinogenic compound. Also, it is eliminated from the diet of patients having abdominal surgery and ulcers because of its irritating effect upon the intestines, being replaced by what is referred to as a bland diet. However, extracts from black pepper have been found to have antioxidant properties and anti-carcinogenic effects, especially when compared to chili.

Piperine present in black pepper acts as a thermogenic compound. Piperine enhances the thermogenesis of lipid and accelerates energy metabolism in the body and also increases the serotonin and beta-endorphin production in the brain.

Piperine and other components from black pepper may also be helpful in treating vitiligo, although when combined with UV radiation should be staggered due to the effect of light on the compound.

Flavour

Pepper gets its spicy heat mostly from the piperine compound, which is found both in the outer fruit and in the seed. Black pepper contains between 4.6% and 9.7% piperine by mass, and white pepper slightly more than that. Refined piperine, by weight, is about one percent as hot as the capsaicin in chili peppers. The outer fruit layer, left on black pepper, also contains important odour-contributing terpenes including pinene, sabinene, limonene, caryophyllene, and linalool, which give citrusy, woody, and floral notes. These scents are mostly missing in white pepper, which is stripped of the fruit layer. White pepper can gain some different odours (including musty notes) from its longer fermentation stage.

Pepper loses flavour and aroma through evaporation, so airtight storage helps preserve pepper’s original spiciness longer. Pepper can also lose flavour when exposed to light, which can transform piperine into nearly tasteless isochavicine. Once ground, pepper’s aromatics can evaporate quickly; most culinary sources recommend grinding whole peppercorns immediately before use for this reason.

Handheld pepper mills (or “pepper grinders”), which mechanically grind or crush whole peppercorns, are used for this, sometimes instead of pepper shakers, dispensers of pre-ground pepper. Spice mills such as pepper mills were found in European kitchens as early as the 14th century, but the mortar and pestle used earlier for crushing pepper remained a popular method for centuries after as well.

World trade

Peppercorns (dried black pepper) are, by monetary value, the most widely traded spice in the world, accounting for 20 percent of all spice imports in 2002. The price of pepper can be volatile, and this figure fluctuates a great deal year to year; for example, pepper made up 39 percent of all spice imports in 1998. By weight, slightly more chilli peppers are traded worldwide than peppercorns. The International Pepper Exchange is located in Kochi, India. Participation on the IPE however is domestic with regulatory restrictions on international membership on local exchanges; something common to almost all Asian commodity exchanges.

As of 2008, Vietnam is the world’s largest producer and exporter of pepper, producing 34% of the world’s Piper nigrum. Other major producers include India (19%), Brazil (13%), Indonesia (9%), Malaysia (8%), Sri Lanka (6%), China (6%), and Thailand (4%). Global pepper production peaked in 2003 with over 355,000 t (391,000 short tons), but has fallen to just over 271,000 t (299,000 short tons) by 2008 due to a series of issues including poor crop management, disease and weather.

Vietnam dominates the export market, using almost none of its production domestically; however its 2007 crop fell by nearly 10% from the previous year to about 90,000 t (99,000 short tons). Similar crop yields occurred in 2007 across the other pepper producing nations as well.