Stainless steel soap is a piece of stainless steel, in the form of a soap bar or other hand-held shape. Its purported purpose is to neutralize or reduce strong odors such as those from handling garlic, onion, durian, guava, salami, or fish.[1]
Example of a bar of stainless steel soap.
No published scientific studies are known to have been conducted on the efficacy of these soaps, for which serious doubts have been raised.[2][3]
The characteristic taste and odor of garlic is due to an oily, slightly yellow organosulfur compound S-Allyl prop-2-ene-1-sulfinothioate, commonly called Allicin. Fresh garlic has little odor until it is chopped or crushed. Allicin is produced from alliin (a derivative of the amino acid cysteine) by the enzyme alliinase.[4] Allicin is unstable and breaks down to form other sulfur compounds such as diallyl sulfides.[5] These compounds contribute to the smell of fresh garlic. When on the hands these sulfur compounds can further degrade into other sulfur compounds, including sulfuric acid, in the presence of water.
The chemistry of stainless steeledit
Steel is an alloy made up of iron mixed with carbon. Stainless steel is composed of steel mixed with at least 10.5% chromium, and often other elements such nickel and molybdenum, etc. Chromium is added to make it resistant to rust. Stainless steels that are corrosion and oxidation resistant typically need more than 11% chromium. Nickel is added to increase the corrosion resistance further, and protect it from harsh environmental conditions. Molybdenum may be added to avoid pitting or scarring. The chemical properties of stainless steel can be further improved for specialized uses by adding other elements, e.g. titanium, vanadium and copper.[6]
Possible mechanismedit
The chromium[7] in stainless steel forms a passive oxide film on the surface of the metal, resulting in corrosion resistance.[8] It is suggested that allicin and the other sulfur compounds (including sulfuric acid) react with the chromium oxide layer, some possibly being adsorbed onto it. Washing the stainless steel soap in water would remove this layer and with it the smelly sulfur compounds. The oxide film would then reform and the stainless steel soap can be reused.[9]
Mark Lorch, Professor of Science Communication and Chemistry at the University of Hull and Joanna Buckley, Materials chemist and science communicator, at the University of Sheffield conducted some "citizen science" in 2016 to test this mechanism but there is no conclusive, rigorous evidence for it.[9]
Usageedit
Companies that produce stainless steel soaps claim that the odors these foods cause result from sulfur, which turns into sulfuric acid upon washing the hands. The aim of the stainless steel soap is to then bind to the sulfur molecules, thus removing them and the associated smell from the hands.[1]
^Lyden, Jacki (2006-11-11). "Does a Bit of Steel Get Rid of That Garlic Smell?". All Things Considered. NPR. from the original on 2015-11-17. Retrieved 8 March 2022.
^Pollick, Michael (2012-04-04). "What is Stainless Steel Soap?". wiseGEEK. from the original on 2015-11-17. Retrieved 8 March 2022.
^Kourounakis, PN; Rekka, EA (November 1991). "Effect on active oxygen species of alliin and Allium sativum (garlic) powder". Research Communications in Chemical Pathology and Pharmacology. 74 (2): 249–52. PMID 1667340.
^Amagase, Harunobu; Petesch, Brenda L.; Matsuura, Hiromichi; Kasuga, Shigeo; Itakura, Yoichi (2001). "Intake of Garlic and Its Bioactive Components". The Journal of Nutrition. 131 (3). Oxford University Press (OUP): 955S–962S. doi:10.1093/jn/131.3.955s. ISSN 0022-3166. PMID 11238796.
^"The Chemical Properties of Stainless Steel That Make it Unique". ScienceStruck. Science Struck & Buzzle.com, Inc. 18 June 2009. Retrieved 9 March 2022.
^Davis, Joseph R., ed. (1994). Stainless Steels. ASM Specialty Handbook. Materials Park, OH: ASM International. ISBN9780871705037. from the original on 14 April 2021. Retrieved 8 March 2022.
^International Stainless Steel Forum (8 March 2020). "The Stainless Steel Family" (PDF). Brussels, Belgium. (PDF) from the original on 24 March 2016. Retrieved 8 March 2022.
^ abLorch, Mark; Buckley, Joanna (24 November 2016). "Does stainless steel really get rid of garlic smells? Round 2. – Chemistry Blog". Chemistry Blog – A Chat and Waffles Chemistry Blog. from the original on 8 January 2023. Retrieved 8 March 2022.
May 03, 2024
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Stainless steel soap is a piece of stainless steel in the form of a soap bar or other hand held shape Its purported purpose is to neutralize or reduce strong odors such as those from handling garlic onion durian guava salami or fish 1 Example of a bar of stainless steel soap No published scientific studies are known to have been conducted on the efficacy of these soaps for which serious doubts have been raised 2 3 Contents 1 Proposed mechanism 1 1 The chemistry of garlic 1 2 The chemistry of stainless steel 1 3 Possible mechanism 2 Usage 3 See also 4 ReferencesProposed mechanism editThe chemistry of garlic edit The characteristic taste and odor of garlic is due to an oily slightly yellow organosulfur compound S Allyl prop 2 ene 1 sulfinothioate commonly called Allicin Fresh garlic has little odor until it is chopped or crushed Allicin is produced from alliin a derivative of the amino acid cysteine by the enzyme alliinase 4 Allicin is unstable and breaks down to form other sulfur compounds such as diallyl sulfides 5 These compounds contribute to the smell of fresh garlic When on the hands these sulfur compounds can further degrade into other sulfur compounds including sulfuric acid in the presence of water The chemistry of stainless steel edit Steel is an alloy made up of iron mixed with carbon Stainless steel is composed of steel mixed with at least 10 5 chromium and often other elements such nickel and molybdenum etc Chromium is added to make it resistant to rust Stainless steels that are corrosion and oxidation resistant typically need more than 11 chromium Nickel is added to increase the corrosion resistance further and protect it from harsh environmental conditions Molybdenum may be added to avoid pitting or scarring The chemical properties of stainless steel can be further improved for specialized uses by adding other elements e g titanium vanadium and copper 6 Possible mechanism edit The chromium 7 in stainless steel forms a passive oxide film on the surface of the metal resulting in corrosion resistance 8 It is suggested that allicin and the other sulfur compounds including sulfuric acid react with the chromium oxide layer some possibly being adsorbed onto it Washing the stainless steel soap in water would remove this layer and with it the smelly sulfur compounds The oxide film would then reform and the stainless steel soap can be reused 9 Mark Lorch Professor of Science Communication and Chemistry at the University of Hull and Joanna Buckley Materials chemist and science communicator at the University of Sheffield conducted some citizen science in 2016 to test this mechanism but there is no conclusive rigorous evidence for it 9 Usage editCompanies that produce stainless steel soaps claim that the odors these foods cause result from sulfur which turns into sulfuric acid upon washing the hands The aim of the stainless steel soap is to then bind to the sulfur molecules thus removing them and the associated smell from the hands 1 See also editAir ioniserReferences edit a b Kitchen Daily 2012 03 13 Why Does Stainless Steel Erase Garlic s Smell HuffPost Retrieved 2019 06 20 Lyden Jacki 2006 11 11 Does a Bit of Steel Get Rid of That Garlic Smell All Things Considered NPR Archived from the original on 2015 11 17 Retrieved 8 March 2022 Pollick Michael 2012 04 04 What is Stainless Steel Soap wiseGEEK Archived from the original on 2015 11 17 Retrieved 8 March 2022 Kourounakis PN Rekka EA November 1991 Effect on active oxygen species of alliin and Allium sativum garlic powder Research Communications in Chemical Pathology and Pharmacology 74 2 249 52 PMID 1667340 Amagase Harunobu Petesch Brenda L Matsuura Hiromichi Kasuga Shigeo Itakura Yoichi 2001 Intake of Garlic and Its Bioactive Components The Journal of Nutrition 131 3 Oxford University Press OUP 955S 962S doi 10 1093 jn 131 3 955s ISSN 0022 3166 PMID 11238796 The Chemical Properties of Stainless Steel That Make it Unique ScienceStruck Science Struck amp Buzzle com Inc 18 June 2009 Retrieved 9 March 2022 Davis Joseph R ed 1994 Stainless Steels ASM Specialty Handbook Materials Park OH ASM International ISBN 9780871705037 Archived from the original on 14 April 2021 Retrieved 8 March 2022 International Stainless Steel Forum 8 March 2020 The Stainless Steel Family PDF Brussels Belgium Archived PDF from the original on 24 March 2016 Retrieved 8 March 2022 a b Lorch Mark Buckley Joanna 24 November 2016 Does stainless steel really get rid of garlic smells Round 2 Chemistry Blog Chemistry Blog A Chat and Waffles Chemistry Blog Archived from the original on 8 January 2023 Retrieved 8 March 2022 Retrieved from https en wikipedia org w index php title Stainless steel soap amp oldid 1214216583, wikipedia, wiki, book, books, library,
