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Topic hub — 2026-10-20

Does salting or boiling bitter melon lower its bitterness?

If bitter melon tastes too bitter, rub it with salt or blanch it briefly: cookbooks often say so. What do studies in which people actually tasted the result say? This page lines up the included studies together with their conditions: how the fruit was cut, how strong the salt was and for how long, how it was rinsed and squeezed, what form was tasted, and who rated it on what scale. It then separates what was established within one experiment, what differences between studies might explain, and what this comparison alone cannot separate.

On this page (10 sections)
  1. What this page establishes
  2. What the included studies allow us to say
  3. Bitterness ratings at a glance
  4. Conditions and results, study by study
  5. What was established within an experiment
  6. Candidate explanations for the differences
  7. What is not known — what this comparison alone cannot separate
  8. How studies and rows were counted
  9. What we looked at
  10. Read in the encyclopedia
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What this page establishes

What the included studies allow us to say

Bitterness ratings at a glance

Only the results in which people rated bitterness. Values for "Pretreated" and "Comparison" are as reported. "Direction" is the larger of the two values; gaps the paper does not treat as a difference are shown as "about the same". Select a study name to jump to its detailed table.

Results in which people rated bitterness only. Values are as reported; scales and methods differ between studies, so compare within a row, not across rows.

StudyConditionMeasured asPretreatedComparisonDirection / test
Araki 2013Boiled 3 min vs rawmean ± SD on a 5-point scale (11 people)−0.3 ± 1.31.2 ± 1.0 (raw)Comparison higher
Tested, significant
Araki 2013Rubbed with 1% salt, rinsed in hot water and squeezed, vs rawmean ± SD on a 5-point scale (11 people)−0.5 ± 1.11.2 ± 1.0 (raw)Comparison higher
Tested, significant
Araki 2013Rubbed with 1% salt, rinsed in water and squeezed, vs rawmean ± SD on a 5-point scale (11 people)0.4 ± 1.21.2 ± 1.0 (raw)Comparison higher
Tested, significant
Araki 2013Soaked in water 5 min vs rawmean ± SD on a 5-point scale (11 people)1.1 ± 1.41.2 ± 1.0 (raw)About the same
Tested, not significant
Araki 2013As dishes: with pretreatment (for okonomiyaki, boiled 1 min) vs without (raw bitter melon with the pith; grated for okonomiyaki)3-point scale with the pretreated recipe as 0 (11 people)0 (reference)0.1 ± 0.4 / −0.1 ± 0.2About the same
Tested, not significant
Araki 2011Slicing, salt rubbing, boiling and other pretreatments (comparison not given)Not givenNot givenNot givenDirection not given
Tested, not significant
Nakama 2008Rubbed with 1% salt vs rawscoring method (16 people)Not givenNot givenDirection not given
Tested, significant
Nakama 2008Boiled 1 min in water vs rawscoring method (16 people)Not givenNot givenDirection not given
No test of the difference
Rashima 2017Juice from fruit soaked 60 min in 3.5% (w/v) brine and blanched 3 min vs juice from fruit neither soaked nor blanchedmean ± SD on a 15 cm line scale (cm; 10 panelists × 2)10.6 ± 1.110.7 ± 1.7About the same
Tested, not significant
Maehashi 2008Extract with 1% salt added vs withoutrelative value on a 10 cm line scale (5 people; approximate readings from the chart)about 2.4about 3.9Comparison higher
Tested, significant

Conditions and results, study by study

For each study, the conditions for the fruit, the pretreatment, the form tasted and the rating, and the results. Each row is one study × one measured result, so different pretreatments in the same study are separate rows. Under each row we give where it is in the paper and whether it can be used to judge whether pretreatment lowers bitterness, with the reason. Nothing is left blank: "not given", "not read" and "not applicable" are kept apart.

Araki 2013 sensory only

「緑のカーテン」ゴーヤの苦味軽減とエコ・クッキングでの活用. 日本家庭科教育学会誌 56(1):35-42 — doi:10.11549/jjahee.56.1_35

How deeply checked
Checked in full text — Read in the full text of the J-STAGE PDF (Tables 1–3)
Samples
Bitter melon (cultivar and origin not given); seeds and pith removed, sliced 1 mm thick
Roasting
Boiled 3 min / rubbed with 1% salt for 1 min, left 4 min, rinsed 10 s in hot water / the same rinsed in water (both squeezed to 70% of weight) / soaked in water 5 min / raw
Brewing
Slices tasted as they were
Who rated, on what scale
11 people (eco-cooking instructors and junior-college students); 5-point scale (−2 very weak to +2 very strong); two-way ANOVA and t-test; training and replicates not given
MeasuredConditionPretreatedComparisonUnitDirection / test
Bitterness intensity (sensory)Boiled 3 min vs raw−0.3 ± 1.31.2 ± 1.0 (raw)mean ± SD on a 5-point scale (11 people)Comparison higher
Tested, significant
Significantly less bitter than raw (5% level) Where: Table 2, p. 38
For whether pretreatment lowers bitterness: Limited — The same 11 people compared it with raw, with a test; but training is not stated, and the result is for 1 mm slices
Bitterness intensity (sensory)Rubbed with 1% salt, rinsed in hot water and squeezed, vs raw−0.5 ± 1.11.2 ± 1.0 (raw)mean ± SD on a 5-point scale (11 people)Comparison higher
Tested, significant
Significantly less bitter than raw (5% level) Where: Table 2, p. 38
For whether pretreatment lowers bitterness: Limited — As above; it was rinsed in hot water and squeezed to 70% of weight after rubbing, so salt, heat and squeezing were applied together and their contributions cannot be separated
Bitterness intensity (sensory)Rubbed with 1% salt, rinsed in water and squeezed, vs raw0.4 ± 1.21.2 ± 1.0 (raw)mean ± SD on a 5-point scale (11 people)Comparison higher
Tested, significant
Significantly less bitter than raw (5% level) Where: Table 2, p. 38
For whether pretreatment lowers bitterness: Limited — As above; rinsed in water and squeezed to 70% of weight after rubbing
Bitterness intensity (sensory)Soaked in water 5 min vs raw1.1 ± 1.41.2 ± 1.0 (raw)mean ± SD on a 5-point scale (11 people)About the same
Tested, not significant
No significant difference from raw Where: Table 2, p. 38
For whether pretreatment lowers bitterness: Limited — As above
Bitterness intensity (sensory)As dishes: with pretreatment (for okonomiyaki, boiled 1 min) vs without (raw bitter melon with the pith; grated for okonomiyaki)0 (reference)0.1 ± 0.4 / −0.1 ± 0.23-point scale with the pretreated recipe as 0 (11 people)About the same
Tested, not significant
No significant difference for either dish (champuru / okonomiyaki). Because pretreated slices tasted more bitter as they stood and lost colour and texture (p. 38), the authors devised versions without pretreatment Where: Table 3, p. 40
For whether pretreatment lowers bitterness: Limited — Compared within dishes; besides pretreatment, use of the pith and slicing versus grating also differ

Araki 2011 sensory only

「緑のカーテン」ゴーヤの苦味軽減料理の提案とエコ・クッキングの応用. 日本調理科学会大会研究発表要旨集 23:166 — doi:10.11402/ajscs.23.0.166.0

How deeply checked
Abstract only — Conference abstract (no related full paper was found)
Samples
Bitter melon (details not given)
Roasting
Slicing, salt rubbing, boiling and so on (details not given)
Brewing
Not given
Who rated, on what scale
Not given
MeasuredConditionPretreatedComparisonUnitDirection / test
Bitterness intensity (sensory)Slicing, salt rubbing, boiling and other pretreatments (comparison not given)Not givenNot givenNot givenDirection not given
Tested, not significant
The abstract says no significant reduction in bitterness was seen; the comparison, values and panel size are not given Where: Abstract
For whether pretreatment lowers bitterness: Limited — Abstract only, with no comparison, values or panel size

Nakama 2008 sensory only

野菜の苦味を抑制するトレハロースの効果. 日本調理科学会大会研究発表要旨集 20:180 — doi:10.11402/ajscs.20.0.180.0

How deeply checked
Abstract only — Conference abstract (no related full paper was found)
Samples
Bitter melon (origin, cultivar and cut not given)
Roasting
Rubbed with 1% salt / boiled 1 min in water (rubbing time and rinsing not given). The study is about trehalose and also has groups soaked in trehalose before salting or boiled in trehalose solution (this table takes only the ordinary pretreatments)
Brewing
Not given
Who rated, on what scale
16 people, scoring method, ANOVA (scale range and training not given)
MeasuredConditionPretreatedComparisonUnitDirection / test
Bitterness intensity (sensory)Rubbed with 1% salt vs rawNot givenNot givenscoring method (16 people)Direction not given
Tested, significant
Reported as significantly different, but the direction and values are not in the abstract Where: Abstract
For whether pretreatment lowers bitterness: Limited — Abstract only, with no direction or values
Bitterness intensity (sensory)Boiled 1 min in water vs rawNot givenNot givenscoring method (16 people)Direction not given
No test of the difference
The abstract does not report the result of the boiled-versus-raw bitterness comparison Where: Abstract
For whether pretreatment lowers bitterness: Limited — Abstract only; the result of the boiled-versus-raw bitterness comparison itself is not reported

Rashima 2017 sensory only

Influence of sodium chloride treatment and polysaccharides as debittering agent on the physicochemical properties, antioxidant capacity and sensory characteristics of bitter gourd (Momordica charantia) juice. Journal of Food Science and Technology 54(1):228-235 — doi:10.1007/s13197-016-2454-y

How deeply checked
Checked in full text — Read in the full text on PMC (Table 5 and Methods)
Samples
Ripe light-green bitter melon bought at a supermarket (Malaysia, cultivar not given); seeds removed, cut 2 cm thick
Roasting
Soaked in 3.5% (w/v) brine at 25 °C for 60 min, rinsed and blanched at 96 °C for 3 min; the comparison was neither soaked nor blanched
Brewing
The clarified juice was tasted (both with 0.3% (w/v) citric acid added, pasteurised at 90 °C for 10 s and centrifuged)
Who rated, on what scale
10 trained panelists; 15 cm line scale (anchored with caffeine solutions); 2 replicates; ANOVA with Duncan's test
MeasuredConditionPretreatedComparisonUnitDirection / test
Bitterness intensity (sensory)Juice from fruit soaked 60 min in 3.5% (w/v) brine and blanched 3 min vs juice from fruit neither soaked nor blanched10.6 ± 1.110.7 ± 1.7mean ± SD on a 15 cm line scale (cm; 10 panelists × 2)About the same
Tested, not significant
No significant difference; the same treatment significantly lowered sourness (5.5 vs 8.8) Where: Table 5
For whether pretreatment lowers bitterness: Limited — Trained panel, line scale and a test; but the fruit was soaked rather than rubbed, tasted as juice, and blanching is combined in

Maehashi 2008 sensory only

Reduction of Bitterness of the Bitter Gourd by Katsuobushi. 日本食品科学工学会誌 (Nippon Shokuhin Kagaku Kogaku Kaishi) 55(4):186-190 — doi:10.3136/nskkk.55.186

How deeply checked
Checked in full text — Read in the full text of the J-STAGE PDF (Figures 1, 3 and 5); values are approximate readings from the charts
Samples
Supermarket bitter melon, blended with water, centrifuged and freeze-dried into an extract
Roasting
Not applicable (salt was added to the extract, not used as a pretreatment)
Brewing
The extract was dissolved at 20 mg/mL and tasted
Who rated, on what scale
5 people selected by taste discrimination; 10 cm line scale; t-test
MeasuredConditionPretreatedComparisonUnitDirection / test
Bitterness intensity (sensory)Extract with 1% salt added vs withoutabout 2.4about 3.9relative value on a 10 cm line scale (5 people; approximate readings from the chart)Comparison higher
Tested, significant
1% salt lowered it significantly (p < 0.05); 0.5% salt showed a downward trend that was not significant Where: Figure 3, p. 188
For whether pretreatment lowers bitterness: Not usable — Not a pretreatment but the effect of adding salt; material for weighing the salt left after rubbing

Kawakami 2009 sensory only

キュウリとニガウリの調理塩揉み工程における香気の変化. 日本家政学会誌 60(10):877-885 — doi:10.11428/jhej.60.877

How deeply checked
Checked in full text — Read in the full text of the J-STAGE PDF (Table 1 and Discussion)
Samples
Bitter melon from Ibaraki bought at a store; 100 g sliced 1.5 mm thick
Roasting
Rubbed for 1 min with 0, 1 or 2% salt
Brewing
Not applicable (the smell was assessed)
Who rated, on what scale
15 people rated smell intensity on 3 levels; Kruskal–Wallis test; bitterness was not measured
MeasuredConditionPretreatedComparisonUnitDirection / test
Grassy smellRubbed with 1% or 2% salt vs without salt“mellow”“intensely grassy”3-level smell intensity and free comments (15 people)Comparison higher
Tested, significant
Significant difference between no salt and 1% or 2%; none between 1% and 2%; bitterness was not measured Where: Table 1, p. 879
For whether pretreatment lowers bitterness: Not usable — Grassy smell, not bitterness

Donya 2007 composition only

Effects of Processing Methods on the Proximate Composition and Momordicosides K and L Content of Bitter Melon Vegetable. Journal of Agricultural and Food Chemistry 55(14):5827-5833 — doi:10.1021/jf070428i

How deeply checked
Abstract only — Abstract only (full text with the publisher)
Samples
A Sri Lankan cultivar of bitter melon
Roasting
Blanching (temperature and time not given in the abstract), as well as frying, drying and others
Brewing
Not applicable (compound analysis)
Who rated, on what scale
No sensory evaluation is described in the abstract
MeasuredConditionPretreatedComparisonUnitDirection / test
Bitter glycosides (momordicosides)Blanched vs raw (presence of momordicosides K and L)not detecteddetectedpresence or absence (not amounts)Comparison higher
No test of the difference
No bitterness evaluation is given in the abstract; whether the compounds broke down or leached into the water cannot be told from it Where: Abstract
For whether pretreatment lowers bitterness: Not usable — Presence of compounds; the abstract gives no evaluation of perceived bitterness

What was established within an experiment

Only results where the same panel compared changed conditions within one study.

Candidate explanations for the differences

Conditions that differ between studies, or between pretreatments, and could explain differences in bitterness. Several conditions differ at once, so which one mattered is unknown. These are candidates, not causes.

What is not known — what this comparison alone cannot separate

How studies and rows were counted

The number of evidence rows is not the number of studies. Table rows, ledger evidence rows, papers and research groups are counted separately.

What we looked at

The sources examined for this question, why each was included or excluded, and which full texts could not be reached. We searched PubMed, Europe PMC, J-STAGE and CiNii for studies on bitter melon bitterness and pretreatments such as salting, boiling and soaking, and added the sources already in the lab's ledger.

SourceDecisionWhy
「緑のカーテン」ゴーヤの苦味軽減とエコ・クッキングでの活用 (2013) doiIncluded in the tablePeople compared 5 pretreatments on the same fruit, with a test; read in full
「緑のカーテン」ゴーヤの苦味軽減料理の提案とエコ・クッキングの応用 (2011) doiIncluded in the tableAn earlier report from the same group; abstract only, included because its conclusion conflicts with the later paper
野菜の苦味を抑制するトレハロースの効果 (2008) doiIncluded in the tableCompared salt rubbing and boiling with raw (the subject is trehalose); abstract only, and the ordinary-pretreatment comparisons taken here have no direction or values
Influence of sodium chloride treatment and polysaccharides as debittering agent on the physicochemical properties, antioxidant capacity and sensory characteristics of bitter gourd (Momordica charantia) juice (2017) doiIncluded in the tableTrained panelists compared juice after brine soaking and blanching; read in full
Reduction of Bitterness of the Bitter Gourd by Katsuobushi (2008) doiIncluded in the tableNot a pretreatment, but shows that adding salt lowers bitterness; read in full
キュウリとニガウリの調理塩揉み工程における香気の変化 (2009) doiIncluded in the tableShows that salt rubbing changes grassy smell; bitterness not measured; read in full
Effects of Processing Methods on the Proximate Composition and Momordicosides K and L Content of Bitter Melon Vegetable (2007) doiIncluded in the tableBitter glycosides undetectable after blanching; abstract only
Influences of Lactiplantibacillus plantarum dy-1 Fermentation on the Bitterness of Bitter Melon Juice, the Composition of Saponin Compounds, and Their Bioactivities (2024) doiExcludedThe bitterness values for pasteurised versus fresh juice come from an electronic tongue, not human rating; the subject is fermentation
Evaluate the effect of β-cyclodextrin on the sensory and physicochemical properties of bitter gourd extract during thermal processing (2024) doiFull text not reachableHeated extracts for 20 min; the abstract does not say how heating alone changed bitterness, and the full text is subscription-only
Optimization of salt curing of bitter gourd (Momordica charantia L.) with blanching as pre-treatment using response surface methodology (2016) doiFull text not reachableOptimised salt-curing conditions; the abstract gives no sensory bitterness values; full text subscription-only
Strategies to improve palatability and increase consumption intentions for Momordica charantia (bitter melon): a vegetable commonly used for diabetes management (2011) doiExcludedMixed bitter melon into dishes; not a study comparing with salt pretreatment
農林水産省「うちの郷土料理」ゴーヤーチャンプルー 沖縄県Read as context (not an experiment)Recommends lightly salting and squeezing if bitterness bothers you; no measurement of the effect
チャンプルースタディレシピ集 改訂第2版Read as context (not an experiment)Recommends a quick dip in boiling water or light salt rubbing and rinsing; the two are not compared
เคล็ดลับลดความขมจากผักรสขม(スアンドゥシット大学のコラム) (2024)Read as context (not an experiment)Recommends removing seeds and pith, washing in brine and soaking 10–20 min; no measurement of the effect
宮崎県工業技術センター・食品開発センター研究報告(サイクロデキストリン) (2001)ExcludedAdds cyclodextrins to juice, which is not a pretreatment (a public prefectural report exists)

Read in the encyclopedia

Source ledger

Each study's source can be reached from its section above. All of the lab's sources are listed in thesource ledger.

How to cite this page

Aoki, M. (NIGAMI LAB) (2026). Does salting or boiling bitter melon cut its bitterness?. https://nigamilab.com/en/topics/goya-salt-rub/

Each claim card has a stable anchor (#clm-…). The dataset is CC BY 4.0; see the data page. Dataset DOI: 10.5281/zenodo.22739101