Black pepper

                         

Black pepper (Piper nigrum) is a flowering vine in the family Piperaceae, cultivated for its fruit, which is usually dried and used as a spice and seasoning. When dried, the fruit is known as a peppercorn. When fresh and fully mature, it is approximately 5 millimetres (0.20 in) in diameter, dark red, and, like all drupes, contains a single seed. Peppercorns, and the ground pepper derived from them, may be described simply as pepper, or more precisely as black pepper cooked and dried unripe fruit), green pepper (dried unripe fruit) and white pepper (ripe fruit seeds).

Black pepper is native to south India and is extensively cultivated there and elsewhere in tropical regions. Currently, Vietnam is the world's largest producer and exporter of pepper, producing 34% of the world's Piper nigrum crop as of 2013.

Dried ground pepper has been used since antiquity for both its flavour and as a traditional medicine. Black pepper is the world's most traded spice. It is one of the most common spices added to cuisines around the world. The spiciness of black pepper is due to the chemical piperine, not to be confused with the capsaicin characteristic of chili peppers. Black pepper is ubiquitous in the modern world as a seasoning and is often paired with salt.

                                                                                                                                                 
Production and trade

Top black pepper producers in 2013[14] (thousands of tonnes)
Country	Production
Vietnam	163
Indonesia	89
India	53
Brazil	42
China	31
World	473

As of 2013, Vietnam was the world's largest producer and exporter of black peppercorns, producing 163,000 tonnes or 34% of the world total of 473,000 tonnes (table).^] Other major producers include Indonesia (19%), India (11%) and Brazil (9%) (table). Global pepper production may vary annually according to crop management, disease and weather. Vietnam dominates the export market, using almost none of its production domestically.

Peppercorns are among the most widely traded spice in the world, accounting for 20 percent of all spice imports.

World map with black pepper production information.

Plant

Piper nigrum from an 1832 print

Unripe drupes of Black Pepper (Piper nigrum) at Trivandrum, Kerala, India

The pepper plant is a perennial woody vine growing up to 4 metres (13 ft) in height on supporting trees, poles, or trellises. It is a spreading vine, rooting readily where trailing stems touch the ground. The leaves are alternate, entire, 5 to 10 centimetres (2.0 to 3.9 in) long and 3 to 6 centimetres (1.2 to 2.4 in) across. The flowers are small, produced on pendulous spikes 4 to 8 centimetres (1.6 to 3.1 in) long at the leaf nodes, the spikes lengthening up to 7 to 15 centimetres (2.8 to 5.9 in) as the fruit matures. The fruit of the black pepper is called a drupe and when dried is known as a peppercorn.

Pepper can be grown in soil that is neither too dry nor susceptible to flooding, moist, well-drained and rich in organic matter (the vines do not do too well over an altitude of 900 m (3,000 ft) above sea level). The plants are propagated by cuttings about 40 to 50 centimetres (16 to 20 in) long, tied up to neighbouring trees or climbing frames at distances of about 2 metres (6 ft 7 in) apart; trees with rough bark are favoured over those with smooth bark, as the pepper plants climb rough bark more readily. Competing plants are cleared away, leaving only sufficient trees to provide shade and permit free ventilation. The roots are covered in leaf mulch and manure, and the shoots are trimmed twice a year. On dry soils the young plants require watering every other day during the dry season for the first three years. The plants bear fruit from the fourth or fifth year, and typically continue to bear fruit for seven years. The cuttings are usually cultivars, selected both for yield and quality of fruit.

A single stem will bear 20 to 30 fruiting spikes. The harvest begins as soon as one or two fruits at the base of the spikes begin to turn red, and before the fruit is fully mature, and still hard; if allowed to ripen completely, the fruit lose pungency, and ultimately fall off and are lost. The spikes are collected and spread out to dry in the sun, then the peppercorns are stripped off the spikes.

Black pepper is either native to Southeast Asia or South Asia. Within the genus Piper, it is most closely related to other Asian species such as Piper caninum.

Phytochemicals, folk medicine and Research

'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 folk medicine. Long pepper, being stronger, was often the preferred medication, but both were used. Black pepper (or perhaps long pepper) was believed to cure several illnesses, such as constipation, insomnia, oral abscesses, sunburn and toothaches, among others. Various sources from the 5th century onward recommended 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 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.

Piperine is under study for its potential to increase absorption of selenium, vitamin B₁₂, beta-carotene and curcumin, as well as other compounds. As a folk medicine, pepper appears in the Buddhist Samaññaphala Sutta, chapter five, as one of the few medicines allowed to be carried by a monk. Pepper contains phytochemicals, including amides, piperidines, pyrrolidines and trace amounts of safrole which may be carcinogenic in laboratory rodents.

Piperine is under study for a variety of possible physiological effects, although this work is preliminary and mechanisms of activity for piperine in the human body remain unknown.

Flavor

Handheld pepper mills

Black pepper grains

Pepper gets its spicy heat mostly from piperine derived both from the outer fruit and 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 found 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. The aroma of pepper is attributed to rotundone (3,4,5,6,7,8-Hexahydro-3α,8α-dimethyl-5α-(1-methylethenyl)azulene-1(2H)-one), a sesquiterpene originally discovered in the tubers of cyperus rotundus, which can be detected in concentrations of 0.4 nanograms/L in water and in wine: rotundone is also present in marjoram, oregano, rosemary, basil, thyme, and geranium, as well as in some Shiraz wines.

Pepper loses flavour and aroma through evaporation, so airtight storage helps preserve its 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 grinders, which mechanically grind or crush whole peppercorns, are used for this, sometimes instead of pepper shakers that dispense 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 have remained a popular method for centuries as well.