1. Introduction
Citrus species and 1300 of other species, classified in 140 genera, are members of the family Rutaceae. The fruit is grown mainly in south of Iran which is characterized with warm and humid climate, which is perfect for growing citrus [1]. Currently only the juice of the fruit is commercially used and the seeds are considered as waste. In general, peels, seeds, and pulps (around 50% of the fruit) are dealt with as wastes, while, potentially, they can be source of valuable byproduct [2]. Around 85 million ton (MT) of different types of citrus are the annual production of the world and Iran's contribution to this volume is 650.000 MT (9% of global production) [3]. The species of the fruit are found to be of medical values and are also used in confectionary, toiletry, and perfume industry. Given the economic, medical, and dietary values of citrus seed oil, there has been a recent surge of studies on the chemical composition (fatty acid content in particular) of the oil of seeds of different species of Citrus. Many works have measured the oil content of citrus seeds: Tunisian citrus seeds (26.1–36.1%) [4], Brazilian Rangpur lime seeds (32.0–38.3%) [5], Egyptian citrus seeds (40.2–45.5%) [6], Tunisian sweet orange (51.8%) and lemon seeds (78.9%) [4], and Pakistani citrus seeds (27.0–36.5%) [7]. Taking into account the gravity of the subject under study and given the large number of similar studies in Iran, the present one measures the seed oils of more commonly found citrus fruits in Iran in an attempt to determine fatty acid composition of the neutral lipid classes of seed oils.