Analysis The cell mass was estimated by measuring
optical density at 660nm after treating the culture broth
with 5% cellulase at 50°C for 30min. To measure the
amount of cellulose produced, cellulose in the culture
broth was washed twice with distilled water and then
treated with 1% NaOH at 90°C for 30min to dissolve
the cell mass. Purified cellulose was washed twice with
distilled water and dried at 80°C to constant weight.
Amounts of glucose, fructose, sucrose and gluconic acid
in the culture broth were determined using HPLC (510,
Waters Co., USA). Glucose, fructose and sucrose were
detected using a RI monitor (410, Waters Co.) with a
carbohydrate analysis column (4.6 x 250 mm, Waters
Co.). The mobile phase contained 80% acetonitrile at
the flow rate of 2.0 ml/min. Gluconic acid was measured
using a UV monitor (486, Waters Co.) at wave length of
210 nm with an Aminex HPX-87H column (7.8 x 300 mm,
Bio-Rad Co. USA). The mobile phase contained 0.002 N
H2S04 at the flow rate of 0.6ml/min. Time (h)
Analysis The cell mass was estimated by measuringoptical density at 660nm after treating the culture brothwith 5% cellulase at 50°C for 30min. To measure theamount of cellulose produced, cellulose in the culturebroth was washed twice with distilled water and thentreated with 1% NaOH at 90°C for 30min to dissolvethe cell mass. Purified cellulose was washed twice withdistilled water and dried at 80°C to constant weight.Amounts of glucose, fructose, sucrose and gluconic acidin the culture broth were determined using HPLC (510,Waters Co., USA). Glucose, fructose and sucrose weredetected using a RI monitor (410, Waters Co.) with acarbohydrate analysis column (4.6 x 250 mm, WatersCo.). The mobile phase contained 80% acetonitrile atthe flow rate of 2.0 ml/min. Gluconic acid was measuredusing a UV monitor (486, Waters Co.) at wave length of210 nm with an Aminex HPX-87H column (7.8 x 300 mm,Bio-Rad Co. USA). The mobile phase contained 0.002 NH2S04 at the flow rate of 0.6ml/min. Time (h)
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