زيت بذر الكتان

زيت بذر الكتان : linSeed Oil, وقريبه الأشهر في مصر ما يطلق عليه زيت حار (FlaxSeed Oil) وهوالذي يوضع علي غالبية أطباق الفول في مصر,

linseed

...

إستخدامات زيت بذور الكتان متعددة كطعام , وفي الصناعات المتعددة,

كطعام فإن زيت بذور الكتان المضىية والبيضاء غير طعم الزيت الحار المستخلص من بذور داكنة, ولا اللون, وإن كان كثيرا ما يتم خلطهم ...

زيت حار

الزيت الحار (FlaxSeed Oil) هوزيت يستخرج من الحشيشة الحاره تشبه بذور الكتان, وكثيرا ما يعصر مع بذور الكتان اويخلط معه الزيت لاحقا ليباع (زيت حار) ومنتشر في مصر في محلات الفول والطعمية والكشري

... بذور الكتان الداكنة هي التيقد يكون طعم زيتها قوي ومميز , (brown flax seed),

Chemical aspects

Linseed oil is a triglyceride, like other fats. Linseed oil is distinctive for its unusually large amount of α-linolenic acid, which has a distinctive reaction with oxygen in air. Specifically, the fatty acids in a typical linseed oil are of the following types:

The triply unsaturated α-linolenic acid (51.9–55.2%),
The saturated acids palmitic acid (about 7%) and stearic acid (3.4–4.6%),
The monounsaturated oleic acid (18.5–22.6%),
The doubly unsaturated linoleic acid (14.2–17%).

Having a high content of di- and tri-unsaturated esters, linseed oil is particularly susceptible to polymerization reactions upon exposure to oxygen in air. This polymerization, which is called "drying", results in the rigidification of the material. The drying process can be so exothermic as to pose a fire hazard under certain circumstances. To prevent premature drying, linseed oil-based products (oil paints, putty) should be stored in airtight containers.

Like some other drying oils, linseed oil exhibits fluorescence under UV light after degradation.

Representative triglyceride found in a linseed oil, a triester (triglyceride) derived of , , and .

الاستخدامات

Most applications of linseed oil exploit its drying properties, i.e., the initial material is liquid or at least pliable and the aged material is rigid but not brittle. The water-repelling (hydrophobic) nature of the resulting hydrocarbon-based material is advantageous.

Paint binder

"Your country needs flax .." U.S. WWII poster soliciting linseed oil for use in paint

Linseed oil is a common carrier used in oil paint. It can also be used as a painting medium, making oil paints more fluid, transparent and glossy. It is available in varieties such as cold-pressed, alkali-refined, sun-bleached, sun-thickened, and polymerised (stand oil). The introduction of linseed oil was a significant advance in the technology of oil painting.

Putty

Traditional glazing putty, consisting of a paste of chalk powder and linseed oil, is a sealant for glass windows that hardens within a few weeks of application and can then be painted over. The durability of putty is owed to the drying properties of linseed oil.

Nutrient content

Typical fatty acid content	%	% European
Palmitic acid	6.0	4.0–6.0
Stearic acid	2.5	2.0–3.0
Arachidic acid	0.5	0–0.5
Palmitoleic acid	-	0–0.5
Oleic acid	19.0	10.0–22.0
Eicosenoic acid	-	0–0.6
Linoleic acid	24.1	12.0–18.0
Alpha-linolenic acid	47.4	56.0–71.0
Other	0.5	-

Nutrition information from the Flax Council of Canada.

Per 1 tbsp (14 g)

Calories: 126
Total fat: 14 g
Omega-3:ثمانية g
Omega-6: 2 g
Omega-9: ثلاثة g

Flax seed oil contains no significant amounts of protein, carbohydrates or fibre.

مقارنة بالزيوت النباتية الأخرى

زيت نباتي
النوع	عملية التصنيع	الأحماض الدهنية المشبعة	الأحماض الدهنية الأحادية غير المشبعة		الأحماض الدهنية المتعددة غير المشبعة			درجة التبخر
النوع	عملية التصنيع	الأحماض الدهنية المشبعة	مجموع الأحماض الأحادية	حمض الزيت(ω-9)	مجموع الأحماض المتعددة	حمض ألفا-اللينولينيك (ω-3)	حمض اللينولييك(ω-6)	درجة التبخر
الأفوكادو		11.6	70.6		13.5	1	12.5	249 °م (480 °ف)
كانولا		7.4	63.3	61.8	28.1	9.1	18.6	238 °م (460 °ف)
زيت جوز الهند		82.5	6.3	6	1.7			175 °م (347 °ف)
زيت الذرة		12.9	27.6	27.3	54.7	1	58	232 °م (450 °ف)
زيت بذرة القطن		25.9	17.8	19	51.9	1	54	216 °م (420 °ف)
زيت بذر الكتان		9.0	18.4	18	67.8	53	13	107 °م (225 °ف)
زيت الأفيون		7.0	9.0	9.0	82.0	22.0	54.0	166 °م (330 °ف)
زيت زيتون		13.8	73.0	71.3	10.5	0.7	9.8	193 °م (380 °ف)
زيت النخيل		49.3	37.0	40	9.3	0.2	9.1	235 °م (455 °ف)
زيت فول سوداني		20.3	48.1	46.5	31.5		31.4	232 °م (450 °ف)
عصفر		7.5	75.2	75.2	12.8	0	12.8	212 °م (414 °ف)
زيت فول الصويا		15.6	22.8	22.6	57.7	7	51	238 °م (460 °ف)
زيت زهرة الشمس		10.1	45.4	45.3	40.1	0.2	39.8	227 °م (440 °ف)
زيت زهرة الشمس		9.9	83.7	82.6	3.8	0.2	3.6	227 °م (440 °ف)
زيت بذرة القطن	هدرجة	93.6	1.5		0.6		0.3
زيت النخيل	هدرجة	88.2	5.7		0
زيت فول الصويا	هدرجة	14.9	43.0	42.5	37.6	2.6	34.9
القيم كنسبة (٪) بالوزن من الدهون الكلية.

=مراجع

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