## 3 Results
### Identification of Key Aromatic Compounds in the Pulps of Five Mango Cultivars  
Not all volatile substances in mango contribute to its aroma, and thus aromatic intensity identification was conducted to determine whether the high content or unique volatile components in mango contribute to its overall aroma. The frequency-of-detection (FD) method requires the evaluator to smell the same aromatic substance and record the peak time and aromatic properties of the aromatic substance. The more times the aromatic substance was detected, the greater the contribution to the overall aroma. The intensity (OSME) method was a GC-O detection method that was used to evaluate flavor contribution based on the odor intensity of the aroma substance. After the aromatic substances are separated by GC-MS, the method directly describes the change in odor intensity (measured) and the frequency of aroma attributes. It is considered to be the simplest and most effective GC-O analysis method because it is less time-consuming and less demanding on assessors. Thirty-three characteristic aromatic components were identified in the five mango pulps by GC-O combined with FD and OSME methods, including three alcohols, 10 aldehydes, 11 terpen, three esters, and four ketones. The differences in aromatic components in the pulp of five mango cultivars were not significant. Further analysis, the FD analysis identified 23 aromatic substances (FD \(\geq\) 2) in JM. According to the FD statistical data of each substance in the Table 2, one of the substances (FD = 8) was identified in all of the tests: \(\gamma\)-terpinene with citrus aroma. The substances with FD = 7 were phellandrene (citrus-like aroma) and \(\gamma\)-octanoic (floral, violet aroma). The substances with FD = 6 were ethyl cyclopropanecar-boxylate (fruit aroma) and terpionlene (rosin aroma). In QM, 18 aromatic substances with FD \(\geq\)2 were identified. According to the FD statistical data of each substance in the table, three kinds of substances (FD = 8) were identified in all of the tests, including 1-penten-3-one, 3-hexenal, and terpionlene. 1-penten-3-one had mushroom-like aroma, 3-hexenal had a grassy aroma, and terpionlene had a rosin-like aroma. The substance with FD = 7 was \(\beta\)-pinene, which has a green-grass-type aroma. The substances with FD = 6 were \(p\)-cymene (citrus and green aroma) and \(\gamma\)-terpinene (citrus and lemon-like aroma). In GF, 18 aromatic substances with FD \(\geq\)2 were identified. According to the FD statistical data of each substance in Table, 2 substances with FD = 8 were identified in all of the tests: ethyl cyclopropanecarboxylate (fruit aroma) and \(\gamma\)-terpinene (citrus and lemon aroma). The substances with FD = 7 were 3-hexenal (green grass aroma) and terpionlene (rosin-like aroma). The substance with FD = 6 was \(p\)-cymene (citrus and green aroma). In HY, 23 aromatic substances with FD \(\geq\)2 were identified. The substances with FD = 8 were ethyl cyclopropanecarboxylate (fruit aroma). The substances with FD = 7 were cis-2-penten-1-ol (grass and tea aroma), 3-hexenal (green grass aroma), and terpionlene (rosin-like). The substance with FD = 6 was \(p\)-cymene (citrus and green aroma). In TN, there were 24 aromatic substances with FD \(\geq\) 2. The substances with FD = 8 were terpionlene and \(\gamma\)-terpinene, which mainly had a rosin citrus-like aroma. The substances with FD = 6 were ethyl cyclopropanecarboxylate, \(\beta\)-myrcene, 2-carene, phellandrene, and \(p\)-cymene. They had a fruity rosin and sweet aroma. The OSME analysis showed that the aromatic intensities of the five mango pulps had significant differences (Figure 5). There were 23 kinds of aromatic components in JM, and the substances with the aromatic intensity greater than 2 were phellandrene (4.1), colimene (2.33), \(\gamma\)-terpinence (2.3), and terpionlene (2.3). This suggests an overall aromatic profile of citrus, green grass, and flowers.