Propylene glycol (IUPAC name: propane-1,2-diol) is a synthetic organic compound with the chemical formula C3H8O2. It is a viscous, colorless liquid which is. Propylene glycol is a synthetic liquid substance that absorbs water. Propylene glycol is also used to make polyester compounds, and as a base for deicing. Propylene glycol is a substance commonly used as a food additive or ingredient in many cosmetic and hygiene products. The US and.
While few chemicals are entirely without risk, propylene glycol is considered to be safe at the low concentrations, used in personal care products and even food products. I think for those of us with curly hair, propylene glycol's main benefit is the fact that it is a humectant, and a pretty effective one at that. The application of propylene glycol that is most relevant to those of us with curly hair is as a humectant.
All the usual cautions apply with regard to its capabilities to attract water to the hair from the environment or to draw water from the hair to itself. Unless you have the perfect atmospheric conditions, you may experience problems with this ingredient. Propylene glycol is a completely water-soluble material that will not build up on the hair.
It is also important to note that it is a diol with low volatility, meaning it will not evaporate easily and cause dry hair in the manner of low molecular weight alcohols such as SD alcohol and isopropyl alcohol. Propylene glycol should not be a feared ingredient. If product manufacturers are finding replacement ingredients to fulfill the same purposes in their formulas served by propylene glycol, I see no harm in that. However, I hesitate to support marketing materials that use this as a selling point.
As a curly, it would be wise to be aware if you are using products that contain this ingredient, just in case you observe increased frizz or dryness.
Use plenty of moisturizing products to help lock moisture into your hair shaft, which can help prevent any potential problems caused by a humectant. Since the original publication of this article discussing the use of propylene glycol in personal hair products and food, the popularity of e-cigarettes has brought increased attention to this ingredient. Propylene glycol is used as one of the three main ingredients in e-cigarettes, along with nicotine and flavoring.
In April , the New York Times reported on the presence of formaldehyde in e-cigarettes, "E-cigs often use propylene glycol or glycerol to help transport nicotine and flavors and to create the big vapor cloud. Writer Tonya McKay Becker is a curly-haired polymer scientist and cosmetic chemist whose academic and industrial research experience have provided her with expertise in the fundamentals and applications of polymer science and colloid chemistry.
Excess creatinine is a sign that the kidney is unable to process compounds at a normal rate. People who already operate with poor kidney function are unlikely to be able to process propylene glycol efficiently and should avoid exposure when possible.
A study from the University of Connecticut assessed the treatment of propylene glycol toxicity and also noted it can be dangerous for those with liver problems. On an interesting, positive note, propylene glycol might actually have the ability to protect your liver from damage done by the common headache medication, acetaminophen.
In the case of propylene glycol, it should be no different. Before the completed growth of these enzyme pathways, parents should avoid allowing their children to ingest or be exposed to many chemicals that are potentially harmful, and pregnant mothers should do the same. Heart disease and symptoms have been commonly associated with propylene glycol exposure, mostly in part due to a few case studies that have caused alarming concern.
One such patient was an 8-month-old who suffered a heart attack after four doses of topical medication to treat a burn. A horse was also reported to suffer a myocardial edema after a mistaken oral dosage of a very large amount of propylene glycol.
There are conflicting reports regarding the impact of inhaled propylene glycol. In rats, some scientists have found enlarged cells in the respiratory tract, as well as some nasal hemorrhaging. In another case, the horse mentioned above who suffered myocardial edema eventually died of respiratory arrest. I did mention earlier that propylene glycol is not considered bioaccumulative builds up over time in the bloodstream.
However, critically ill adults may be an exception to this rule. When administered large doses of Lorazepam, adults with or without kidney issues have experienced an abnormal buildup of propylene glycol. One interesting case study followed a year-old woman diagnosed with pneumonia.
After discontinuing the drug that poisoned her body, her condition stabilized for a period of time, but she later died after her condition deteriorated again. Perhaps the most concerning part of constant propylene glycol exposure is the way that it may provide other chemicals a free pass into your bloodstream.
So, although propylene glycol may not be as terrifying as some people claim, it does have enough red flags to cause me to recommend avoiding it. In order to protect your general health, hormone balance and overall chemical exposure, there are a few ways to avoid propylene glycol when possible.
Make use of it! A great number of cosmetics include propylene glycol, but in the U. Lotions and baby wipes also make the list of products that commonly contain this chemical. The acute oral toxicity of propylene glycol E is very low, and large quantities are required to cause perceptible health damage in humans; propylene glycol is metabolized in the human body into pyruvic acid a normal part of the glucose-metabolism process, readily converted to energy , acetic acid handled by ethanol-metabolism , lactic acid a normal acid generally abundant during digestion ,  and propionaldehyde a potentially hazardous substance.
The potential for long-term oral toxicity is also low. Food and Drug Administration as " generally recognized as safe " GRAS for use as a direct food additive , including frozen foods such as ice cream and frozen desserts. Prolonged contact with propylene glycol E is essentially non-irritating to the skin.
Exposure to mists may cause eye irritation, as well as upper respiratory tract irritation. Inhalation of propylene glycol vapors appears to present no significant hazard in ordinary applications. This concentration has been linked to use of water-based paints and water-based system cleansers. However, the study authors write that glycol ethers and not propylene glycol are the likely culprit. Propylene glycol does not cause sensitization , and it shows no evidence of being a carcinogen or of being genotoxic.
Adverse responses to intravenous administration of drugs that use propylene glycol as an excipient have been seen in a number of people, particularly with large dosages. Responses may include "hypotension, bradycardia QRS and T abnormalities on the ECG, arrhythmia , cardiac arrest, serum hyperosmolality , lactic acidosis , and haemolysis ". Individuals who cannot tolerate propylene glycol experience inflamed dry skin in the facial area, or small red dots on the body.
Therefore, propylene glycol allergy is more common in those countries. Propylene glycol is known to exert high levels of biochemical oxygen demand BOD during degradation in surface waters. This process can adversely affect aquatic life by consuming oxygen needed by aquatic organisms for survival. Large quantities of dissolved oxygen DO in the water column are consumed when microbial populations decompose propylene glycol.
Sufficient dissolved oxygen levels in surface waters are critical for the survival of fish, macroinvertebrates, and other aquatic organisms. If oxygen concentrations drop below a minimum level, organisms emigrate, if able and possible, to areas with higher oxygen levels or eventually die. This effect can drastically reduce the amount of usable aquatic habitat.
From Wikipedia, the free encyclopedia. Not to be confused with polypropylene glycol or ethylene glycol. An Encyclopedia of Chemicals, Drugs, and Biologicals. Retrieved 3 October Contact, Atopic, Occupational, Drug. Check date values in: Agency for Toxic Substances and Disease Registry. Major Oxygenated, Chlorinated and Nitrated Derivatives. John Wiley and Sons, Inc.
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Propylene Glycol is a propanediol that exists as a clear, colorless and hygroscopic liquid and consists of propane where the hydrogens at positions 1 and 2 are. Recently, the ingredient propylene glycol has been in the news. We first learned about this ingredient from Sean O'Keefe, PhD, a food science. What is propylene glycol? Propylene glycol is a common ingredient found in many products we use in our daily life. Propylene glycol and other.