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Selangor, Malaysia.
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Penang Branch Office
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Penang, Malaysia.
+604-638 4558
+604-645 4558
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Measuring the pH of Shampoo.

Shampoo, or more accurately the concept of shampoo, has existed since the time of the first ancient civilizations. Among centuries of adaptation and development, the act of cleansing hair has changed quite dramatically; at first, a combination of oils, herbs, and perfumes were used as a way to simply freshen hair. Upon further understanding of hygienic health, soap was included in the combination to physically clean the hair. As the science behind hair care progressed, manufacturers synthesized chemical additives for use in shampoo as fragrance, foaming agents, and coloured dyes. Shampoo is now created and structured towards various hair types, as well as to achieve a certain end result, such as the reduction of dandruff. Both the synthetic and natural ingredients used in a shampoo dictate the pH of that particular product. The pH of a shampoo will alter the natural pH of skin and hair, which ideally falls between pH 3 and 5 and pH 4 and 5, respectively, thereby affecting their physical and chemical makeup.

The human scalp contains sebaceous glands which secrete sebum, a semiliquid substance composed of glycerides, waxes, and fatty acids. Sebum coats the outer layer of hair, called the cuticle, to prevent loss of water. The presence of sebum helps to maintain soft and flexible hair, as well as prevent the growth of bacteria and the spread of fungal infections on the scalp. However, due to its chemical makeup, sebum also attracts dirt. Shampoo is composed primarily of cleaning agents, such as detergents, that work to remove dirt and excess sebum, leaving a light layer of sebum on the scalp. A detergent molecule is composed of both nonpolar and polar portions, permitting oil and grease to be stripped from the scalp and hair by the nonpolar portion and washed away with water by the polar component; upon reaction with water, detergent molecules tend to produce alkaline solutions. Hair is composed of long, parallel chains of amino acids that are connected by forces such as hydrogen and disulphide bonds and salt bridges between acid and base groups. Environments that are either too alkaline or too acidic can affect and, at some levels, break these bonds. At pH levels between pH 1 and 2, both hydrogen bonds and salt bridges are broken. At slightly alkaline levels, closer to a pH of 8.5, some of the disulphide bonds are broken; with repeated washes at this pH, disulphide bonds will continue to break and result in “split ends.” Finally, at a pH near 12, all three types of bonds are broken and the hair dissolves. Ideally, shampoo should be “pH-balanced,” meaning that it would have a similar pH to that of hair to omit any negative effects on the scalp or hair due to pH variations. Some hair care companies produce pH-balanced shampoo, either with synthetic and/or natural components.

Application :

A company that produced all-natural skin and hair care products was in need of a new pH electrode to spot test their pH-balanced shampoos. aura24 exchange bet Instruments recommended the HI1053 pH Electrode for Fats and Creams. The HI1053 provides a fast response time in the viscous sample due to the increased flow rate from outer reference that has a triple ceramic junction. A standard single ceramic junction in the outer reference has a flow rate of 15-20 μL/hour while the triple ceramic has a flow rate of 40-50 μL/hour. The HI1053 electrodes are available with different connection types. To the customer’s appreciation, they were able to use their new aura24 exchange bet HI1053B pH electrode with a competitor pH meter, as it was equipped with the universal BNC connection. Since the major components of their shampoo consisted of natural materials, including coconut-based derivatives, the aura24 exchange bet Sales Representative also supplied the customer with the HI7077 Cleaning Solution for Oils and Fats for occasional cleaning procedures to maintain a good working condition. Overall, the customer was more than satisfied with the technical assistance from aura24 exchange bet Instruments in finding the best pH electrode for their application.

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