Oleoresin character of Topo onion (Allium cepa. L.) at various ages of harvest.

The aim of this study is to evaluate the chemical component of Topo onion oleoresin at various harvest ages. Characteristics of oleoresin extracted with 96% ethanol derived from onions (Allium cepa L.) Oleoresin extraction is carried out by maceration, with comparison material and solvent at a ratio of 1:5, at an extraction temperature of 40°C for 2.5 hours. Onions grown on the Topo lowland Tidore islands were harvested at various stages: 73, 83, 93, and 103 days after planting. The yield of oleoresin, chemical constituent profiles of oleoresin components, and chemical composition of Topo onions were all measured. The results of this study showed that the highest yield of oleoresin-rich onions was harvested 83 days after planting at 98.89% WB, compared with the onions at harvest. The chemical components of onions' oleoresin harvested at various ages revealed that the highest range of compounds with onions' oleoresin is 93 days with 17 components of the compound, while the lowest component oleoresin extracted from onions to harvest 103 DAP is only 9 component compounds. For the compound with the highest relative concentration, see Hydroxymethylfurfurole (74.17%) of onions harvested at 103 DAP. Sulfur compounds identified in the oleoresin extracted with ethanol are thiophene and 3,4-dimethyl-2,5-dihydrothiophene-2-one. According to the findings, 83 days after harvest was when the yield of oleoresin in Topo onions was at its highest (98% dry weight). In contrast, the oleoresin from Topo onions harvested at 93 days of age contains 17 chemical components, which is a higher number than that of onions harvested at other ages. The primary component of this compound was 1,2-benzenedicarboxylic acid, which is a triterpenoic compound. At 103 days after harvest, Hydroxymethylfurfurole (HMF) was the dominant component. [ABSTRACT FROM AUTHOR]