GC-MS Reveals Regional Flavor and Aroma Shifts in Oranges

Newhall navel oranges, a popular type of citrus grown widely in China, can taste noticeably different depending on where they are grown. To figure out what is driving these differences, researchers compared the quality of Newhall navel oranges from 13 different growing regions and looked at how the compounds responsible for aroma and flavor relate to local climate conditions. To identify these aroma-related compounds, they used headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME-GC-MS). A paper based on their work was published in the journal Foods.¹

What is the Newhall Navel Orange, and Why Does Its Quality Vary Across Different Growing Regions in China?

Navel oranges are one of the most economically important crops in China's citrus industry. There are several different varieties of navel oranges grown, with the most popular ones being Newhall, Fukumoto, Cara Cara, and Lane Late.^2-4The Newhall navel orange first appeared in California as a natural genetic variation of the Washington navel orange, and is prized for ripening early, producing high yields, storing well, and being popular with buyers, which has made it the most widely grown sweet orange variety in China. Since it was introduced there in 1978, Newhall navel oranges have been grown extensively across regions including Jiangxi, Hubei, Chongqing, Sichuan, Guangxi, and Hunan.^5,6However, as growers have expanded where they plant these oranges, the fruit's quality has started to vary quite a bit from one region to another, largely because of differences in climate and soil. This inconsistency makes it harder for consumers to know what to expect, and it also makes it difficult for the industry to build consistent standards and strong, recognizable brands.¹

What Causes the Differences in Taste and Aroma of Newhall Navel Oranges Grown in Different Regions, and Which Climate Factors Are Responsible?

The results of the study showed clear differences between regions in both how the oranges tasted/felt and their aroma. Sweetness, tartness, and peel color turned out to be the main factors that best explained the differences in fruit quality. Using HS-SPME-GC-MS, the researchers identified 106 different aroma compounds in the fruit and narrowed these down to 56 compounds that seemed to best explain the differences between regions. By comparing this data with local weather patterns, they found that certain climate factors played an important role in shaping the fruit's aroma, particularly average wind speed throughout the year, how much temperatures swung between day and night while the fruit was growing, and, during the ripening stage, wind speed, hours of sunshine, and day-to-night temperature swings.¹

“The study,” wrote the authors of the paper,¹ “clarified the geographical variations in physicochemical characteristics and volatile profiles of Newhall navel oranges, as well as the key climatic factors linked to volatile metabolism, providing a crucial theoretical basis for site-specific cultivation planning, demarcation of high-quality production areas, and targeted quality regulation of citrus varieties.”

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References

1. Hu, Y.; Lu, W.; Ma, M. et al. Geographical Variations of Volatile Metabolites in Newhall Navel Orange Based on HS-SPME-GC-MS and Meteorological Factors. Foods 2026, 15 (13), 2313. DOI: 10.3390/foods15132313
2. Wu, S. W.; Zhang, C. M.; Li, M. et al. Effects of Potassium on Fruit Soluble Sugar and Citrate Accumulations in Cara Cara Navel Orange (Citrus sinensis L. Osbeck). Sci. Hortic. 2021, 283, 110057. DOI: 10.1016/j.scienta.2021.110057
3. Montgomery, K. H.; Brar, G.; Krishnan, V. V. Metabolomics Study at the Postharvest Conditions of Cold Storage and Fungicide (Imazalil Sulfate) Treatment in Navel Oranges and Clementine Mandarins. ACS Agric. Sci. Technol. 2022, 2, 79–89. DOI: 10.1021/acsagscitech.1c00169
4. Li, Q. S.; Srivastava, A. K.; Zou, Y. N. et al. Field Inoculation Responses of Arbuscular Mycorrhizal Fungi versus Endophytic Fungi on Sugar Metabolism Associated Changes in Fruit Quality of Lane Late Navel Orange. Sci. Hortic. 2023, 308, 111587. DOI: 10.1016/j.scienta.2022.111587
5. Gan, J. C.; Zhang, J. B.; Du, X. Z. et al. Optimisation of Chromosome Preparation Technique for Young Leaves of the Newhall Navel Orange. N. Z. J. Crop Hortic. Sci. 2025, 53, 1547–1559. DOI: 10.1080/01140671.2024.2385801
6. Shu, X.; Xie, M.; Zhang, X. et al. Untargeted Metabolomics Comparison and Nutrition Evaluation of Geographical Indication Newhall Navel Oranges in China. Foods 2025, 14, 355. DOI: 10.1016/j.foodchem.2025.145135