Analysis of dencichine by HPLC with pre-column derivatization Analysis of monosaccharide compositions of Lentinus edodes polysaccharide by HPLC The effect of rice field greenhouse gas emission reduction practice on the contents of amino acids in rice grains Determination of amino acids in Alisma orientale by pre-column derivatization of RP-HPLC Variation of monosacchride composition of polysacchrides in Dendrobium officinale by pre-column derivatization HPLC method