Volatile constituents of sugarcane juice (Saccharum officinarum, L.) during processing and storage [Philippines]
1986
Jimenez, P.O.
Results have shown that changes were observed in pH, % titratable acidity, color, reducing sugars, but not in % soluble solids which remained quite unchanged throughout the experiment. Isolation of the volatile constituents was done by vacuum distillation, solvent extraction using methylene chloride and concentration using the Rotavap equipment under reduced pressure. Gas chromatography analyses of the volatile extracts were done on a polyethylene glycol (PEG, 10%) in a 60-80 mesh Shimalite column packing with an FID detector system and Nitrogen carrier gas flow rate of 20 ml/min. Gas chromatogram showed a total number of eight peaks, labelled P1 to P8. Of the eight peaks, P6 appeared to be present in all samples. While P1, P2, P3 and P6 were found in most of1690 the samples, only P3 and P6 were present in unprocessed juice. P1 and P2 appeared after processing and during storage. The rare peaks P4, P5, P7 and P8 were present in the 3-month stored juice. These were also present except P5 in the spoiled stored juice. So far, only P3 had been identified as benzaldehyde. Direct gas chromatography-mass spectrometry (GC-MS) analysis was done on some selected sugarcane volatile extracts. At least six compounds were tentatively identified by GC-MS. Methyl-n-tetradecanoate was identified in the heated unprocessed juice. Alpha-ionone was present in the 13-day old, 91-day old bottled sugarcane juice. This was also present in the 45-day old spoiled juice sample. Two other compounds, N-octadecane and B-methyl-P-isopropyl phenyl propionaldehyde were identified in the 91-day old juice. Syringoldehyde was present in the heated unprocessed, freshly processed 13-day old, 91-day old juice and none in the 45-day old spoiled sam
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