A wide variety of SPE methods have been reported for the
extraction of ADF from food products Table 3. González, Gallego,
and Valcárcel (2003) have determined natural and synthetic
colorants in lyophilized foods using an automatic solid-phase
extraction system using ammonia, methanol mixture as eluents
and RP-C18 cotton as stationary phase. Harp, Miranda-Bermudez,
Baron, and Richard (2012) have performed the extraction of seventeen
food colorants in forty-seven food products employing a simple
SPE process. Recently, Tang et al. (2014) have studied the
extraction of sixteen synthetic colorants in complex hotpot condiment
with high oil content. They have reported that the combination
of methanol, acetone (1:1, v/v) and 2 mol/L carbamide
solution containing 5% ammonia in methanol had shown excellent
extraction efficiency while purification by a GPC column. In recent
times, Chen et al. (2014) have investigated the use of NH2-LDC-MP
as a sorbent in SPE under magnetic field to enhance the extraction
recoveries of seven synthetic food dyes using pure water (pH 9.0)
as an extraction solvent.
A wide variety of SPE methods have been reported for theextraction of ADF from food products Table 3. González, Gallego,and Valcárcel (2003) have determined natural and syntheticcolorants in lyophilized foods using an automatic solid-phaseextraction system using ammonia, methanol mixture as eluentsand RP-C18 cotton as stationary phase. Harp, Miranda-Bermudez,Baron, and Richard (2012) have performed the extraction of seventeenfood colorants in forty-seven food products employing a simpleSPE process. Recently, Tang et al. (2014) have studied theextraction of sixteen synthetic colorants in complex hotpot condimentwith high oil content. They have reported that the combinationof methanol, acetone (1:1, v/v) and 2 mol/L carbamidesolution containing 5% ammonia in methanol had shown excellentextraction efficiency while purification by a GPC column. In recenttimes, Chen et al. (2014) have investigated the use of NH2-LDC-MPas a sorbent in SPE under magnetic field to enhance the extractionrecoveries of seven synthetic food dyes using pure water (pH 9.0)as an extraction solvent.
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