orange juice
ingredient / ingredient-orange-juice
オレンジジュース / Citrus sinensis
Juice from sweet orange (Citrus sinensis).
On this page (6 sections)
Reading the bitterness
Orange juice is the juice of sweet orange (Citrus sinensis). Research using sensory-guided fractionation and taste re-engineering demonstrated that the characteristic flavor of orange juice containing bitterness was experimentally reconstructed, yet no single chemical compound was identified that could fully account for that bitterness.
The same research reports that multiple classes of components—limonin and limonoid glycosides, polymethoxyflavones, organic acids, and sugars—interact in complex ways to produce bitterness. The need to understand bitterness not through a single marker compound but through combinations of components is the reason this juice is featured as an entry.
In a classical 1973 threshold study, the discrimination threshold for limonin in water was approximately 1 mg/L, and that for naringin is treated as about 20 mg/L; when sucrose or citric acid was added, both thresholds rose several times over. In a model system with 1.2% citric acid and sucrose added, the maximum discrimination threshold for limonin was 11 mg/kg; the maximum discrimination threshold in natural orange juice was reported as 6.5 mg/kg, both occurring at pH 3.8. However, this study did not address polymethoxyflavones or limonoid glycosides, and thus supports only the acid and sugar side of the picture.
An independent review divides the bitterness of citrus into immediate-onset (from naringin and neohesperidin) and delayed-onset (from limonoids such as limonin), but these flavanone glycosides are found mainly in bitter citrus species and are present in only very small amounts in sweet orange. The bitterness of orange juice can be traced through the perspective of balance among limonoids, polymethoxyflavones, sugars, and acids, connecting to individual pages for each class of compound.
Differences in rootstock have also been examined as a factor that may influence fruit juice flavor. In a study in which sweet orange juice from trees infected with Citrus Huanglongbing (HLB) was evaluated by a sensory panel for each of 6 rootstocks (CH, blue, 1804, FG, SW, Volk), juice from rootstock CH exhibited the best flavor quality with the highest sweetness and the lowest sourness and bitterness, while juice from rootstocks Volk and FG showed the poorest quality evaluation, including bitterness. In metabolite semi-quantification by UHPLC-MS and GC-MS and canonical correlation analysis, some nucleotides and limonin showed positive correlation with bitterness. However, this is data from the special condition of HLB-infected trees, and extrapolation to healthy trees is not guaranteed.
Sources for this overview
Decoding the Nonvolatile Sensometabolome of Orange Juice (Citrus sinensis)
Checked for this overview: Confirmed the successful reconstruction of flavor including bitterness and the absence of a single marker. / Confirmed that bitterness results from the interaction of multiple components.
Effect of some citrus juice constituents on taste thresholds for limonin and naringin bitterness
Checked for this overview: Confirmed the numerical values for limonin and naringin thresholds and the effect of acids and sugars.
Citrus Taste Modification Potentials by Genetic Engineering
Checked for this overview: Confirmed the classification into immediate-onset and delayed-onset types and the restriction to the target species.
Checked for this overview: Sensory evaluation across 6 rootstocks and correlation of bitterness with nucleotides and limonin.
Follow the connections
orange juice →— sensory attribute→ bitterness →can be measured separately …→ astringency
Structured claims — open a section to read each claim's confidence, evidence and limits
Sensory (3)
Scope: Activity-guided fractionation of orange juice and taste reconstitution
Note: A single compound was judged insufficient as a bitterness marker.
Show data
ingredient-orange-juice —has_bitterness_generated_by→ "The interplay of limonin, limonoid glycosides, polymethoxyflavones, organic acids, and sugars"Scope: Orange juice investigated by sensory-guided metabolomics.
Note: Cultivar and processing must be retained for each sample. / 2026-08-31: downgraded from established to supported because full-text verification is absent in supporting evidence. Upgrade is possible after full-text review.
Show data
ingredient-orange-juice —has_sensory_attribute→ sensation-bitterScope: Layer: food. Sensory panel evaluation of sweet orange juice from 6 rootstocks from trees infected with HLB (Citrus Huanglongbing), and metabolite semi-quantification (89 substances) by UHPLC-MS/GC-MS and canonical correlation analysis.
Show data
ingredient-orange-juice —has_perceived_bitterness_affected_by→ "Rootstock variety. When sweet orange juice from HLB-infected trees was evaluated by a sensory panel, juice from rootstock CH showed the best flavor quality with highest sweetness and lowest sourness and bitterness, while juice from rootstocks Volk and FG yielded the poorest quality fruit juice (including bitterness). Nucleotides and limonin showed positive correlation with bitterness."