Heirloom Suwandel rice fragrant 2-acetyl-1-pyrroline: low-temperature pan-roasting?

The distinctive pandan-like fragrance of Ceylon Suwandel rice is produced by the volatile aromatic compound 2-acetyl-1-pyrroline (2-AP). Preserving this delicate aroma requires careful post-harvest handling. Grain must be harvested when moisture reaches 20-22%, followed by slow shade-drying on woven coir mats indoors to prevent sun bleaching. When milling whole grains into flour for traditional festive sweetmeats, the unpolished grain is roasted in shallow earthenware pots over low embers, keeping grain temperatures strictly below 80°C. High roasting temperatures evaporate volatile 2-AP molecules, leaving the flour scentless.