Peach Kernel Oil
INCI Prunus Persica Kernel Oil. CAS 8002-78-6, 8023-98-1, 84012-34-0; EC 281-678-7, as CosIng gives them. Also: Prunus persica kernel oil, Peach seed oil.
Published values
| Saponification value | 195–196.5 mg KOH/g |
| Used by the calculator | 195.8 mg KOH/g (midpoint) |
| SAP for NaOH | 0.1395 g/g |
| Iodine value | 90.2–110.5 g I₂/100 g |
| INS (SAP − IV) | 95 |
| Melting point | — |
| Unsaponifiable matter | 0.45–1.5 % |
One soapmaking book prints 0.136 g NaOH per g. One book prints 0.178 g NaOH per g for peach kernel oil, the same figure it gives palm kernel oil two entries earlier. Peach kernel is an oleic oil and measures 195-196.5 mg KOH/g, so we use 195.8 (0.140), close to the 0.136 other books print.
A bar made of 100 % Peach Kernel Oil
Conventional qualities summed from the fatty-acid groups; a single-oil bar is a reference point, not a recipe.
How much lye
| Oil | NaOH | KOH |
|---|---|---|
| 500 g | 66.3 g(66.0–66.5) | 93.0 g(92.6–93.3) |
| 1 kg | 132.6 g(132.1–133.1) | 186.0 g(185.3–186.7) |
| 1 lb (454 g) | 60.1 g(59.9–60.4) | 84.4 g(84.0–84.7) |
| 2 lb (907 g) | 120.3 g(119.8–120.7) | 168.7 g(168.1–169.4) |
For this oil alone at 5 % superfat, with pure sodium hydroxide (NaOH) or pure potassium hydroxide (KOH); in brackets, across the published range of its saponification value. KOH is usually sold at 90 %: divide by 0.9. For a whole recipe, open the calculator.
Fatty-acid profile
Saturated : unsaturated 9 : 91
| Fatty acid | Published range, % | Used | |
|---|---|---|---|
| Palmitic acid | C16:0 · saturated | 4–7 | 5.5 |
| Palmitoleic acid | C16:1 | ≤ 1 | 1.0 |
| Stearic acid | C18:0 · saturated | 1–6 | 3.5 |
| Oleic acid | C18:1 | 55–72 | 63.5 |
| Linoleic acid | C18:2 | 17–30 | 23.5 |
| α-Linolenic acid | C18:3 n-3 | ≤ 1.5 | 1.5 |
Where these numbers come from
Print date 19 September 2023; created, checked and released 22 August 2023. Read from the rendered PDF page.
Saponification values 195.0 and 196.5; iodine values 90.2, 110.5, 103.54, 99.0; unsaponifiable matter 1.5 and 0.45 %.
Table 3 peach seed oil column; quoted in notes as a measured comparison, not used in the fields.
The fatty-acid bands are the Gustav Heess product specification for refined peach kernel oil (Pfirsichkernoel raffiniert, Reg-Nr. Sp224030d, printed 19 September 2023, released 22 August 2023; Prunus persica kernels, 32-45 % oil, pressed and then refined; INCI printed as Prunus Persica Kernel Oil): palmitic 4.0-7.0, palmitoleic max 1.0, stearic 1.0-6.0, oleic 55.0-72.0, linoleic 17.0-30.0, linolenic max 1.5, other fatty acids max 1.5 % (GC of the FAMEs, Ph. Eur. 2.4.22); acid value max 2.0 mg KOH/g, peroxide value max 10.0 meq O2/kg, relative density (20 C) 0.910-0.920. The sheet prints no saponification or iodine value. SAPONIFICATION VALUE from two PlantFAdb peach kernel datasets (plant 10369): #11100, 'Investigations on the 3 commercial species of Rosaceae' (1984), 195.0 mg KOH/g, with iodine value 90.2, acid value 1.8, 45.1 % oil and palmitic 7.2, stearic 2.3, oleic 74.8, linoleic 15.6 %; #12048, 'On the fatty-acid composition of Turkish vegetable-oils' (1983), 196.5 mg KOH/g with iodine value 110.5. The iodine band also spans #10895 ('Utilization of some untraditional sources of high oleic acid oils for improving vegetable oils stability', 2001) at 103.54 and #11506 ('Study of the glyceridic fraction of lipids of seeds from Rosaceae prunoids', 1986) at 99.0; #11506 also gives unsaponifiable matter 1.5 % and #15441 ('Determination and comparison of oil characteristics in Iranian almond, apricot and peach nuts', 1976) 0.45 %. The Heess midpoints imply about 191.5 mg KOH/g, 2 % under the published values, which is ordinary agreement. A RECENT MEASUREMENT FALLS PARTLY OUTSIDE THE BANDS: Rodriguez-Blazquez et al. 2023 (Molecules 28(20):7045) Soxhlet-extracted (n-hexane) kernels of peach stones from Albacete, Spain: palmitic 7.95, palmitoleic 0.579, margaric 0.0612, stearic 1.401, cis-vaccenic (C18:1 n-7) 1.302, oleic 52.9, linoleic 35.4, alpha-linolenic 0.129, arachidic 0.143, gondoic 0.090 % - more linoleic and less oleic than the refined-oil specification allows, a reminder that kernel oils differ with cultivar and origin. It is quoted here and not merged into the bands, which describe the commercial product. FOR SOAP: a high-oleic, almond-like oil: conditioning, soft on its own, fairly stable. INCI name, CAS and EC numbers are CosIng's, and the Heess sheet prints the same.
This record is part of the open ingredient database (ODbL), which you can download as CSV or JSON. Found an error or a better primary source? Corrections with a link to the document are welcome at support@soapformulator.com.