Saponification is the process in which triglycerides are combined with a strong base to form fatty acid metal salts during the soap-making process. The distribution of unsaturated and saturated fatty acid determines the hardness, aroma, cleansing, lather, and moisturizing abilities of soaps. Plant extracts, such as rosemary, vegetable, and essential oils are frequently added to soaps to enhance quality and sensory appeal. Three natural soaps were formulated using cold saponification to produce a base or control bar BBhibiscus rosehip bar Hand a forest grove bar FG.

Rosemary extract R or essential oil A blends were added as additives to each formulation prior to curing to evaluate the effects of natural plant additives on the lipid composition and sensory characteristics of these natural herbal soaps. Principal component analysis PCA analyses showed the unsaponifiable fatty acids were different in the hibiscus bar compared to the other bars.

There was a very strong correlation between the content of unsaponified Cn3 and Cn9 in all natural soaps. These results indicate that unsaponified fatty acids are important contributors to the quality and overall sensory perception and preference of natural herbal soaps following manufacturing by cold saponification. Current trends in consumer preference have shown an increase in demand for the use of natural ingredients in personal skin care and cosmetics products.

This has resulted in a steady increase in small- and medium-sized artisan hand-made or homemade soap businesses offering a variety of products with a range of natural ingredients to supply this niche market. Formulation of specialty hand-made natural soap bars by artisan soap makers involves a skillful combination of the ingredients, thoughts, and artistic creativity to produce high-quality soap bars with superior sensory characteristics that resonates with consumers [ 1 ].

These sensory characteristics include fragrance, color, lather ability, moisturizing capabilities, hardness, skin compatibility, and chemical stability during storage and use [ 1234 ].

Of these, aroma fragrance and moisturizing capabilities are considered the most influential determinants of consumer preference for natural soap products. Many artisanal soap makers prefer the cold saponification process due to the enhanced aesthetics of the finished product, potential superiority in retaining antioxidants, or the fragrance from essential oils, and creative flexibilities to customize each ingredient including the addition of fresh ingredients, such as fruits and vegetable purees, to obtain a desired end product.

Cold saponification uses the heat generated from the combination of the fatty acids acid in the melted oils and fats with sodium hydroxide base to facilitate the saponification process, which takes 18—24 h to complete, and a further 3—4 weeks to cure the finished soaps [ 3 ]. The sensory and chemical characteristics of natural soaps are dependent on the manufacturing process, and the chemical composition of the feedstock materials used during formulation.

For example, the type and purity of base alkali used determines the hardness and solubility of the finished soap. Sodium hydroxide produces harder, more durable soaps, while potassium hydroxide is used to produce soft soap bars or liquid soaps [ 25 ].

These fatty acids play key roles in the performance of the natural soap, consumer preferences, and the cost of the finished products. Final performance is determined by the carbon chain length, degree of unsaturation number of double bondsand distribution and composition of the saponified fatty acids alkali salts. Saturated fatty acids give light open foams lather and a solid, hard consistency, while unsaturated fatty acids provide moisturizing, conditioning, or skin nourishing properties [ 12356 ].

The most commonly used oil sources in natural herbal soaps are mixtures of palm, coconut, olive, rice bran, and sunflower seed oils [ 13 ]. In some instances, animal fat may be blended with vegetable oils in the final formulation to modulate the soap performance. Vegetable oils tend to be associated with higher quality soaps [ 134 ]. As such, the use of animal fats is typically replaced with palm or coconut oils to enhance the quality and performance of natural soaps.

Vegetable oils tend to be richer in polyunsaturated C, C, and C fatty acids, while beef fat tallow tends to contain higher levels of long chain C—C saturated fatty acids [ 467 ]. Palm and coconut oils, on the other hand contain shorter chain length C—C saturated fatty acids. The shorter chain saturated fatty acids in coconut or palm oil increase the lathering profile of the final soap products due to enhanced solubility in water.

However, fatty acids with 10 or fewer carbons are less desired because they can confer objectionable odors and irritate the skin.

Castor Oil Profile

Conversely, longer C—C chain length fatty acids enhance the cleansing property of the soap, provide a longer lasting soap, and are devoid of objectionable odors [ 134 ]. However, the lathering ability is reduced due to decrease solubility in water with the increase in chain length [ 4 ]. Vegetable oils, such as soybean or olive oils, also contain significant levels of long chain saturated fatty acids C—Cas well as high levels of mono C and polyunsaturated C, C, and C fatty acids.

The solubility and moisturizing capabilities of natural herbals soaps will increase with the degree of unsaturated fatty acids present in the vegetable oils used as soap feedstock [ 157 ]. However, the double bonds found in unsaturated fatty acids are very susceptible to oxidation, which can occur during saponification, curing, and storage.

Oxidation of the double bonds can produce shorter chain fatty acids, aldehydes, ketones, undesirable odors, and discoloration in the soaps, which affects the quality, sensory perception, and shelf life of the final product [ 13 ]. These include grape seeds or rosemary extracts, fruits, and vegetable purees.Certain of these soaps, although soluble trated solution by addition of distilled. One of the objects in making concentrated soap is to have soap in a form that can be conveniently diluted with water to weak 1 solutions.

It is obvious that a gel as indicated will require some time and patience to again take it up in water for forming the weak solution. These weak solutions, while being perfectly fluid, readily attack glass or vitreous surfaces, and in so doing are precipitated, thereby lowering the activity of the solution.

Further, the weak solution is hazy, cloudy and turbid. An object of 'my invention is to produce a soap that may be given a concentrated fluid or paste form providing a weak solution that will be perfectly clear or transparent and which will not attack glass or vitreous surfaces, with the effects previously noted. Although I shall explain my discovery and invention as applied to castor oil soap, and in so explaining the invention and the principles involved, the application of my invention to other soaps and analogous'or parallel chemical processes readily suggest I themselves, wherefore I do not limit myself i to the specific or exact substances, proportions, temperatures and steps that I am- 40 about to enumerate.

In the application of my invention to castor oil soap it should be borne in mind that at the present time castor oil soap is not' commonly found in commerce because no one has shown any advantages in its use. Recently however, a great deal of work has been done to show that castor oil soap has a very definite germicidal power as well as a marked effect in neutralizing bacterial toxins.

It is an object of'my invention to so pre pare castor oil soap that its stated valuable properties may beutilized. To do this the substance should be in such form that it will readily or freely mix with water, and when so admixed" will not attack glass and y be thereby precipitated. The significance in the first instance, if made into a' concenof this is evident when considering that in hospitals, in clinics, and in ordinary household uses or products of this nature, enamel ware is commonly used for holding solutions.

Enamel ware consists of a vitreous or glass surface upon metal. Castor oil soap is a very water soluble soap, in fact much more so than most other soaps. Potassium soaps-are, as a rule, more water soluble than sodium soaps of the corresponding fatt acids, but even castor oil sodium soap is ighly soluble. In explaining my invention I shall explain same as it relates to potassium soaps although it is 'to be understood, that the substance of my invention applies likewise to sodium soaps. One of the objects in makmg a concentrated soap is to have it in a form which would be conveniently diluted to a weak solution.

Inpracticing my invention, I saponify castor oil by the exact equivalent amount of caustic soda, or potash, for obtaining a true neutral'soap. Thisneutral soap has the disfrom the-castor oil, as a result of which the gel will undergo a liquefaction. If the small amounts of free fatty acids of the source indicated' are added while the solution is hot. This li'quefied gel or Solution resulting from the addition of the free fatty.How much Lye should you use in order to saponify a specific fat or oil?

saponification of castor oil

Use this simple saponification table to find out! You can click on each oil or fat within this chart to learn more about its benefits, detriments and how it is used in soap making.

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Before you start making conversions on your own, be sure to read and re-read through the entire explanation on this page of how to use this chart successfully.

At first it will seem like a complicated process, but with a little bit of practice and repetition, it will become an absolute cinch. Except for " Oil or Fat " which merely tells you which ingredient is being discussed and " SAP " which tells you the amount of sodium hydroxide lye needed in order for saponification to occur each of these sections is a characteristic of soap that could be produced by a specific acid.

Click here to learn more about fatty acids and soap making. Keep in mind that most saponification tables merely reveal the Saponification value more on this later and not the characteristics of oils in soap; but for your convenience, I've added the 5 most important attributes that are contributed to your finished product by using a specific fat or oil.

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Unbeatable Soap Making Resource Sales! Sign Up Today! Explaining how to use the saponification table will take more then just a few words. Understanding the mathematical equation required is a good idea for completeness sake but not essential to make soap. At the end of this page, I reveal a neat little short cut that anyone can use so don't be scared off by the seemingly complicated process!

Just read through it once and if you don't want to learn it, use the simplified explanation at the end. The SAP column Saponification value reveals simply how many milligrams of base is required to completely saponify 1 gram of an acid oil or fat. This number usually tells you how much potassium hydroxide potash is needed instead of how much sodium hydroxide lye is needed.

If you have read the section on this website about saponification, you should know that the only ion required for the soap making reaction to take place is the hydroxide ion.

Both potassium hydroxide and sodium hydroxide have the same number of hydroxide ions so the amount of base should be the same regardless of which one is used, right? The molecular weight of potassium hydroxide is less then the molecular weight of sodium hydroxide therefore less sodium hydroxide is required then potassium hydroxide to saponify the same amount of fats or oils. This is truly an arduous process to say the least.

So what's the Bottom line? Since I only use sodium hydroxide for a base and I suggest you do the same, unless you are making liquid soap I have taken the liberty to convert the numbers for you so that they apply to sodium hydroxide.

This means that the SAP value on my saponification table represents how many milligrams of lye sodium hydroxide are needed to saponify exactly 1 gram milligrams of the fat or oil in question.Based on my personal research while making handmade bar soap. Learning both the physical and chemical properties of fats and oils.

Saponification is a type of chemical reaction between a strong alkali or base such as sodium or potassium hydroxide and a fat. Animal and vegetable fats and oils are made of ester molecules called triglycerides. An ester is a molecule that is formed from an alcohol and an acid. In the case of fats, glycerin is the alcohol, and the acids are fatty acids like stearic, oleic, and palmitic acids. When the alkali solution is thoroughly mixed with the oils, a reaction called saponification begins.

What this means is that the glyceride of the triglyceride breaks off to form glycerine and the sodium or potassium bond with the fatty acid to form soap. With sodium, you get bar soap; with potassium, you get liquid soap.

Every oil or fat has what is called a saponification number, which is determined by the amount of alkali needed to completely saponify the fat. Most people have heard about saturated fats and their link to obesity and heart disease and other ailments. But for soap, saturated fats have multiple benefit. Saturated fats are usually solid at room temperature and consist of straight-chained molecules.

For bar soap, they give the soap hardness as helping the soap last longer in the shower. Most commonly used saturated fat used for commercial soap making is beef fat, also known as tallow.

Saponification: The process of Making Soap - MeitY OLabs

It is usually the first and most abundant ingredient in many soaps. It is widely available as a by-product from the meat industry and is therefore one of the cheapest fats. It created a white and very hard bar of soap. Many people with sensitive skin have problems with soaps made with beef tallow.

saponification of castor oil

So, they usually use body washes or seek out bar soap made from gentler vegetable sources. Another common saturated fat is coconut oil. It also gives a very hard white bar of soap, but unlike tallow, the fatty acids are shorter length carbon chains that increase water solubility.

The Roles of Different Fats and Oils in Soap Making

This greater solubility in water helps generate more suds and increases the cleaning ability. Unfortunately, soap made from coconut oil alone would be drying to the skin so some conditioning and moisturizing ingredients need to be added. This drying of the skin is testament to the cleaning power of coconut fatty acid soaps. Alone they strip the skins natural oils right off. Another very common saturated fat is palm oil.

It is the go-to replacement for beef tallow for truly vegan soaps.

Common Soap Ingredients & Saponification Values

It is also a good fat when skin sensitivity to beef tallow is an issue. A common recipe for homemade vegan soap consist of palm, coconut, and olive oil.

The best ingredients to balance the saturated fats in a soap recipe are the unsaturated fats. By contrast, these are usually vegetable oils that are liquid at room temperature and consist mainly of bent and branched chain molecules. They have the property of acting as emollients or moisturizers in soap recipes. In the right proportions, they can effectively offset the drying qualities of saturated fats and create a bar soap that is hard, white, sudsy, and conditioning as well.Castor oil is a vegetable oil pressed from castor beans.

Castor oil is a colourless to very pale yellow liquid with a distinct taste and odor. Oleate and linoleates are the other significant components. Castor oil and its derivatives are used in the manufacturing of soapslubricantshydraulic and brake fluidspaintsdyescoatingsinkscold resistant plasticswaxes and polishes, nylonpharmaceuticals and perfumes.

Castor oil is well known as a source of ricinoleic acida monounsaturatedcarbon fatty acid. Among fatty acids, ricinoleic acid is unusual in that it has a hydroxyl functional group on the 12th carbon.

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This functional group causes ricinoleic acid and castor oil to be more polar than most fats. The chemical reactivity of the alcohol group also allows chemical derivatization that is not possible with most other seed oils.

Because of its ricinoleic acid content, castor oil is a valuable chemical in feedstocks, commanding a higher price than other seed oils. Annually ,—, tonnes — million pounds of castor oil are produced for a variety of uses.

In the food industry, castor oil food grade is used in food additives, flavorings, candy e. Polyoxyethylated castor oil e. In India, Pakistan and Nepal food grains are preserved by the application of castor oil. It stops rice, wheat, and pulses from rotting. For example, the legume pigeon pea is commonly available coated in oil for extended storage.

saponification of castor oil

Use of castor oil as a laxative is attested to in the circa BC Ebers Papyrus[9] and was in use several centuries earlier. Despite castor oil being widely used in an attempt to induce labor in pregnant women, to date there is not enough research to show whether it is effective to dilate the cervix or induce labor.

Therapeutically, modern drugs are rarely given in a pure chemical state, so most active ingredients are combined with excipients or additives. Castor oil, or a castor oil derivative such as Kolliphor EL polyethoxylated castor oil, a nonionic surfactantis added to many modern drugs, including:. Castor oil is also one of the components of Vishnevsky liniment. In naturopathy castor oil has been promoted as a treatment for a variety of human health conditions, [22] including cysts.

However, according to the American Cancer Society"available scientific evidence does not support claims that castor oil on the skin cures cancer or any other disease. Castor oil has been used in cosmetic products included in creams and as a moisturizer. It also has been used to enhance hair conditioning in other products and for supposed anti- dandruff properties. Castor oil is used as a bio-based polyol in the polyurethane industry. The average functionality number of hydroxyl groups per triglyceride molecule of castor oil is 2.

This is applied fairly thickly as a slurry which is self-levelling.

Common Soap Ingredients & Saponification Values

This base is usually further coated with other systems to build a resilient floor [25]. It is not a drying oilmeaning that it has a low reactivity with air compared to oils such as linseed oil and tung oil.

Dehydration of castor oil yields linoleic acidswhich do have drying properties [1]. In this process, the OH group on the ricinoleic acid along with a hydrogen from the next carbon atom are removed yielding a double bond which then has oxidative cross-linking properties yielding the drying oil.You may remember being forced to gulp a tablespoon of castor oil as a kid--and now dislike the idea of it--but it's a wonderful oil to include in your soap recipes.

It, used in combination with coconut and palm kernel oil, imparts extra lather to your soap. It's more of a creamy lather than a bubbly lather like coconut will give you so it's good to use both.

Castor alone makes a mushy not hard or brittle bar, though if used in higher percentages, it can make a nice shampoo bar. It'll never reach the fluffy lather of a coconut oil shampoo barthough. Castor oil added to a soap recipe results in a stable lather that is low, dense, and creamy.

What it does do is add moisturizing qualities to soap. Though it's thick and sticky straight out of the bottle, it is easily absorbed by the skin. Because of its unique fatty acid make-up, there's truly no other oil quite like it. You only need to use about percent in your recipe to see a difference. Be warned, castor oil will speed up your trace. You may want to leave it out of recipes where you want extended time to swirl like a column swirl or even just a multi-layered soap.

You should be able to find all of these ingredients in your supermarket. The lard is sometimes in the Hispanic foods section and the castor oil is often near the pharmacy. Another great, basic recipe. As long as your olive oil is on the light side use light or extra virgin olive oil if you canit will give you a nice white bar of soap.

Most bar soap recipes only use about percent castor oil in them, but shampoo bars take advantage of castor oil's properties and use a much higher percentage.

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It helps create a bar that's more gentle on your hair. A reliable and wonderful basic soap recipe. Read More.If we can't tunnel through the Earth, how do we know what's at its center? All Rights Reserved.

The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Hottest Questions.

Previously Viewed. Unanswered Questions. Needs a Topic. What is the saponification value of castor oil? Wiki User Saponification value is the amount of pure sodium hydroxide needed to saponified grams of oil No. Related Questions Asked in Chemistry What the saponification value of ocimum basilicum oil? This value is between 4 and Asked in Chemistry What is the Saponification value of Glycerin?

Glycerin and soap are the bye-products of saponification. The saponification value of glycerine are values of the percentage of lye it takes to convert one unit of fat, oil or fatty acid into glycerin. Asked in Coconut, Coconut Oil How much should be the saponification value for coconut oil?

Asked in Chemistry What is the difference between saponification value and saponification number? Both saponification value and number is same. The saponification value of an oil is the amount of alkali required to saponify a definite quantity of the sample. It is expressed as the number of milligrams of potassium hydroxide KOH required to neutralize 1 gram of the sample.

Asked in Fish Is castor oil fish oil? Castor oil is extracted from castor seeds. You can extract castor with an oil extracting machine like a screw oil press. Asked in Organic Chemistry Why mineral oil does not undergo saponification? Saponification is the reaction between triesters and alcohol.


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