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The Sulfur Dioxide Residues in Fresh Longan at Different Periods after Fumigation |
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| รหัสดีโอไอ | |
| Creator | Patchara Wonprasaid |
| Title | The Sulfur Dioxide Residues in Fresh Longan at Different Periods after Fumigation |
| Contributor | Wittaya Apai, Sodchol Wonprasaid |
| Publisher | Department of Agriculture |
| Publication Year | 2552 |
| Journal Title | Thai Agricultural Research Journal |
| Journal Vol. | 27 |
| Journal No. | 1 |
| Page no. | 26-26 |
| Keyword | longan, sulfurdioxide, fumigation, residues |
| URL Website | https://at.doa.go.th/journal |
| Website title | Thai Agricultural Research Journal |
| ISSN | 0125-8389 |
| Abstract | The degradation of sulfur dioxide residues in fresh Iongan was studied at the Office of Agricultural Research and Development Region 1 Chiang Mai in 2005. In the experiment, SO2 was fumigated to fresh longan with the use of sulfur at 2 different levels namely 500 and 750 g per longan 1,100 kg and stored at 2๐C. The results showed that the injury of the peel surface growth of fungi, and SO 2 residue levels in the treated longan depended on the level of SO2 applied. The high level of SO2 fumigation had effectively prevented from fruit skin browning and surface fungi infestation with the more yellowish outer skin during storage time. The longan treatad with low level of SO2 showed symptoms of SO2 injury with irregular brown circles, where as longan without SO2 fumigation had brown skin. The high level of SO2 fumigation resulted in higher residues than the low level. Residues were much higher in the peel than in the pulp (15-2615 times). Sulfurdioxide residue levels declined rapidly in the first period fumingation and with the slower rate after fumingation. Sulfurdioxide in the longan pulp treated with low level was 3.13 ppm at the first day after fumigation (DAF). It declined to 50 % at the 3 DAF and was not detected at the 12 DAF. While SO2 in longan pulp treated with high level was 89-99 ppm during the first 5 DAF. It declined below 50 ppm within 12 DAF and reached 5 ppm at 56 DAF. The results had shown that high level of SO2 fumigation gave a better result of storage, but the residues were higher. |
