ABSTRACT
Acknowledgment .................................................................................... 88 Keywords ................................................................................................ 88 References ............................................................................................... 89
4.1 INTRODUCTION
Simultaneous distillation extraction (SDE) is one of the most important extraction methods and more popular among all the known methods for rice aroma chemical analysis (Verma and Srivastav, 2016). This valuable extraction method is also known as Likens-Nickerson steam distillation (Siegmund et al., 1996), which was first reported in 1964 by Likens and Nickerson (1964) and described in 1966 (Nickerson and Likens, 1966). Later, the SDE method was modified by Maarse and Kepner (1970) and Schultz et al. (1977). The SDE method has been considered as one of the most cited methods until now, and it is used for the extraction and isolation of volatile aroma chemical components (Chaintreau, 2001; Pino et al., 2001, 2002). Previously, many researchers have successfully applied the SDE method for the extraction and analysis of various rice volatile aroma chemicals from different cultivars of rice as depicted in Table 4.1 (Buttery et al., 1983, 1986; Laksanalamai and Ilangantileke, 1993; Petrov et al., 1996; Widjaja et al., 1996a, 1996b; Tava and Bocchi, 1999; Bhattacharjee et al., 2003; Wongpornchai et al., 2003; Sunthonvit et al., 2005; Park et al., 2010).
