Abstract: The debittering of Gannan navel juice with magnesium silicate, macroporous resin or β-cyclodextrin was studied with respect to the effects of major process parameters on the contents of sugar, vitamin C and organic acids. The optimum conditions for debittering Gannan navel juice with magnesium silicate were activation temperature 120 ℃, magnesium silicate addition 1.0%, and adsorption at 20 ℃ for 1 h, and under these conditions, the debittering rate and the loss rates of sugar, vitamin C and organic acids were 64%, 11%, 4% and 61%, respectively. Among 6 investigated types of macroporous resin, HP-20 was best for debittering Gannan navel juice, and its optimum adsorption conditions for debittering Gannan navel juice were 1.0% HP-20 addition , 14 h adsorption time and 20 ℃ adsorption temperature, resulting in a debittering rate of 73% and respective loss rates of sugar, vitamin C and organic acids of 5%, 1% and 7%. The optimum conditions for debittering Gannan navel juice with β-cyclodextrin were 0.6%, 20 ℃ and 1 h for β-cyclodextrin addition, temperature and embedding time, respectively, and the resulting debettering rate was 52% and sugar, vitamin C and organic acids were little lost.

Key words: navel juice, debittering technology, loss, sugar, vitamin C, organic acid