Lance Carson
Aromatic rice, also known as scented rice, is a medium- to long-grain rice variety with a distinct aroma, flavour, and taste. Jasmine rice, grown primarily in Thailand, Cambodia, Laos, and southern Vietnam, is a variety of aromatic rice. Its fragrance is caused by the evaporation of a chemical compound called 2-acetyl-1-pyrroline, which is also found in pandan leaves, white bread, and the flowers of the shrub called bread flower. The aroma of jasmine rice is reminiscent of pandan and popcorn, with a slightly sweet and buttery flavour. In this article, we will explore the process of making perfumed rice, including the harvesting, processing, and cooking methods involved in enhancing its unique fragrance.
| Characteristics | Values |
|---|---|
| Varieties of perfumed rice | Jasmine rice, Basmati rice, Ambemohar, Radhunipagal, Sona Masuri, Texmati, etc. |
| Origin | Jasmine rice: Thailand, Laos, Cambodia, Vietnam; Basmati rice: India, Pakistan |
| Aroma | Nutty, popcorn-like, roasted, pandan-like, burnt rice-like |
| Texture | Light and fluffy, sticky |
| Colour | White, creamy white, brown, red, black |
| Use in perfumery | Kenzo Amour, Angel Schlesser Homme, KenzoKi Rice Steam |
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What You'll Learn
The role of 2-acetyl-1-pyrroline
2-acetyl-1-pyrroline (2-AP) is a chemical compound that is the key contributor to the aroma of fragrant rice. It is formed enzymatically in the rice grain as it grows and is also formed when rice is heated, as part of the Maillard reaction. The Maillard reaction occurs between reducing sugar breakdown products and 1-pyrroline, which is derived from the amino acids proline and ornithine.
The discovery of 2-AP as the principal compound imparting the pleasant aroma to scented rice varieties was made in 1982 by Buttery and co-workers. Since then, 2-AP has been identified in all fragrant rice varieties and a wide range of plants, animals, fungi, bacteria, and various food products. It is also a key flavour compound in many cereal products and some vegetable and animal products.
The fragrance of cooked rice consists of more than 200 volatile compounds, and 2-AP is responsible for the specific flavour in aromatic rice. The compound has a very low odour threshold, making it an important contributor to a food's aroma when present. It imparts a characteristic cooked rice or popcorn note to food products.
The biosynthesis of 2-AP in fragrant rice is influenced by various factors, including soil moisture content. Studies have shown that low soil moisture content enhances 2-AP biosynthesis by upregulating the expression of DAO1, which promotes the conversion from putrescine to 2-AP.
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Harvesting jasmine rice
Jasmine rice is a long-grain variety of fragrant rice, also known as aromatic rice. It is primarily grown in Thailand, Cambodia, Laos, and southern Vietnam. The rice is named for its fragrance, which is reminiscent of pandan (Pandanus amaryllifolius) and popcorn. This aroma is produced by the rice plant's natural production of aroma compounds, of which 2-acetyl-1-pyrroline is the most salient.
To harvest jasmine rice, the long stalks are cut and threshed. The rice can then be left in its hulled form, called paddy rice, de-hulled to produce brown rice, or milled to remove the germ and some or all of the bran, producing white rice. The milling process removes the outer layer of the rice grain, which affects the taste, texture, and ease of digestion. White rice has a dry texture when cooked and is often preferred for its taste and ease of digestion. Brown jasmine rice, on the other hand, has a light tan outer layer that gives it a flavor similar to oats. It also has greater health benefits than white jasmine rice, as it contains the bran, which includes vitamins and antioxidants.
The majority of jasmine rice exported overseas to Singapore, Hong Kong, North America, and Europe comes from Thailand, with a small minority sourced from Vietnam. In Thailand, the provinces of Surin, Buriram, and Sisaket are known for producing high-quality hom mali, a type of jasmine rice. The original Khao Dawk [A]Mali rice was discovered in Ban Laem Pradu in the Phanat Nikhom District of Chonburi Province. From there, it made its way to Bang Khla District, Chachoengsao Province, in the mid-1940s to early 1950s, where it was officially named Khao Dawk Mali 105, often shortened to Khao Hom Mali or simply Hom Mali.
Thai jasmine rice and Cambodian jasmine rice share many characteristics and are grown in neighboring geographic areas on opposite sides of the Thai-Cambodian border. Distinct Cambodian jasmine rice varieties include phka rumduol, phka romeat, and phka rumdeng. These varieties possess all 18 known fragrance alleles, with two varietals (phka rumduol and phka rumdeng) having all 18 markers in identical positions.
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Thai jasmine rice
Brown jasmine rice, on the other hand, skips the final polishing stage, retaining the thin brown outer membrane. This variety has a higher vitamin and fibre content, requiring more water and time to cook. It also has a crunchier texture compared to its white counterpart.
The key to cooking Thai jasmine rice perfectly lies in achieving the right water-to-rice ratio. While the package recommends 1.5 cups of water for every cup of rice, adding slightly more water results in a more tender texture. It is also important to rinse the rice thoroughly to remove excess starch and prevent the rice from becoming overly sticky.
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Cambodian jasmine rice
Jasmine rice is a long-grain variety of fragrant rice, also known as aromatic rice. Its fragrance is reminiscent of pandan and popcorn, resulting from the rice plant's natural production of aroma compounds, of which 2-acetyl-1-pyrroline is the most prominent. Cambodian jasmine rice, or phka rumduol, is grown in Cambodia and processed into white (milled and polished) and brown rice. It is cultivated in the northwestern part of the country and in Kampong Speu province, as well as in Battambang province and its neighbours, including Banteay Meanchey province. The rich soil and environment are particularly suitable for this variety of rice.
To harvest jasmine rice, the long stalks are cut and threshed. The rice can then be left in its hulled form, known as paddy rice, de-hulled to produce brown rice, or milled to remove the germ and some or all of the bran, resulting in white rice. Cambodian jasmine rice is typically milled using 6-month crops grown during the wet season, which usually falls between October and December.
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Enhancing the aroma
Perfumed rice, or aromatic rice, is primarily a medium to long-grain rice variety with a distinct aroma, flavour, and taste. The aroma compounds are naturally occurring in all rice types, with the most salient being 2-acetyl-1-pyrroline, which is also found in pandan (Pandanus amaryllifolius) and the bread flower shrub (Vallaris glabra). This compound is responsible for the nutty, popcorn-like fragrance often associated with aromatic rice.
Breeding and Cultivating Aromatic Cultivars:
Select and cultivate rice varieties that are inherently highly aromatic. Certain cultivars, such as Basmati, Jasmine, and Texmati, are known for their prominent nutty or popcorn-like fragrances due to higher levels of 2-acetyl-1-pyrroline. For example, Thai jasmine rice, also known as Khao Hom Mali, is renowned for its distinct fragrance.
Optimise Soil and Climate Conditions:
The aroma intensity in rice can be influenced by the growing environment. Opt for regions with favourable climate conditions, such as Thailand, Cambodia, Laos, and southern Vietnam, where the climate enhances the natural fragrance of the rice plant. Ensure proper soil management practices to maintain optimal soil health, as this can also impact the rice's aroma.
Harvesting and Post-Harvest Processing:
The harvesting and post-harvest processing methods can affect the aroma of the rice. Promptly harvest the rice once it reaches its aromatic peak. Minimise mechanical damage during threshing and processing to preserve the aroma. Additionally, consider the water milling process, which can enhance the fragrance and leave the grains with a silky texture, as seen in Thai jasmine rice.
Controlled Drying and Storage:
Implement controlled drying techniques to optimise the retention of aromatic compounds. Proper drying conditions can help lock in the aroma. Store the rice in optimal conditions to prevent moisture absorption, which could dilute the fragrance.
Blending with Complementary Ingredients:
Enhance the aroma by blending the rice with complementary ingredients that boost its fragrance. For instance, pairing jasmine rice with dishes containing holy basil or stir-fries can accentuate its natural perfume. Similarly, serving perfumed rice with grilled, fried, or braised foods can enhance the overall aromatic experience of the meal.
These techniques provide a foundation for enhancing the aroma of perfumed rice. By understanding the underlying aromatic compounds and applying careful cultivation, processing, and pairing strategies, the fragrance of perfumed rice can be elevated, creating a more intense and pleasing sensory experience.
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Frequently asked questions
Perfumed rice is a type of aromatic rice that has a distinct aroma, flavour, and taste. It is also called scented rice.
The fragrance in perfumed rice is due to the presence of a chemical compound called 2-Acetyl-1-pyrroline. This compound is found in a few foods, including white bread and the Southeast Asian spice pandan.
Perfumed rice is commonly known as jasmine rice. It is a long-grain variety of fragrant rice, primarily grown in Thailand, Cambodia, Laos, and southern Vietnam.
To make perfumed rice, the long stalks of the rice plant are cut and threshed. The rice can then be left in a hulled form called paddy rice, de-hulled to produce brown rice, or milled to remove the germ and some or all of the bran, producing white rice. The milling process also removes the rice bran oil, which is responsible for the rice's aroma. To enhance the fragrance, the dry rice can be toasted in olive oil or butter before adding water.
