Sapindus mukorossi, also known as Reetha, is a species of tree in the family Sapindaceae. The fruit is commonly known as Indian soapberry or washnut, and like other species in the genus Sapindus, it is called soapberry. It is also a native of Western coastal Maharashtra – Konkan, and Goa in India. Sapindus mukorrossi, known as the ritha or reetha tree in India (Hindi) and Nepal, is a deciduous tree that is grown in the lower foothills and midhills of the Himalayans, up to altitudes of 4000 feet. It is tolerant to reasonably poor soil, can be planted around farmers’ homes, and one Ritha tree can produce 30–35 kg of fruit per year.
The value of the tree mostly comes from its fruit, which can be used for many pharmacological and cleansing purposes including, but not limited to, the ones outlined below.
The soapnut contains the compound of saponin, which has natural cleansing properties, and therefore the soapnut can be used as a cleanser for hair, skin, and clothing. These saponins are also useful as insecticides, for purposes such as removing head lice off the scalp.
Methods of extracting the maximum amount of oil from existing oil reserves has become a scientific focus in a world that has become dependent on fossil fuels. Researchers have found that the Ritha fruit can be used in an enhanced oil recovery technique. More specifically, Chhetri, Watts, Rahman, and Islam (2009) found that extracts from the soapnut can be used as an organic surfactant to increase the mobility of oil from the fields. In addition, researchers have demonstrated the potential for the soapnut to be used as a natural surfactant for washing arsenic from soils that are rich in iron.
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- Chhetri, A. B.; Watts, K. C.; Rahman, M. S.; Islam, M. R. (2009). "Soapnut extract as a natural surfactant for enhanced oil recovery". Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. 31 (20): 1893–1903. doi:10.1080/15567030802462622. S2CID 95498375.
- Mukhopadhyay, S.; Hashim, M. A.; Sahu, J. N.; Yusoff, I; Gupta, B. S. (2013). "Comparison of a plant based natural surfactant with SDS for washing of As(V) from Fe rich soil" (PDF). Journal of Environmental Sciences. 25 (11): 2247–2256. doi:10.1016/s1001-0742(12)60295-2. PMID 24552053.
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