For consumers who use laundry detergents, a top unmet need is to reduce malodor that can persist on fabrics, even after washing and drying. A known source of odor is autoxidation of residual sebum on fabric, leading to the generation of an array of odiferous compounds. To prevent this oxidation process, two technologies were evaluated: (i) antioxidants to scavenge radicals and (ii) metal chelants to inhibit the involvement of copper ions as catalysts in the autoxidation process. Copper is a common component of sweat, soil, and municipal water supplies, especially where copper piping is involved, which is typical in many US homes and businesses. For the evaluations, swatches of fabric were treated with artificial sebum, then washed in commercial washing machines with tap water containing laundry detergent, and dried using commercial dryers. Copper added to the wash at a level representative of consumer homes substantially increased the formation of known malodor molecules. Copper chelants [in particular, diethylenetriamine (DETA)] added to the wash were effective in inhibiting the formation of malodor molecules. In combination with antioxidants [in particular, methyl 3‐(3, 5‐di‐tert‐butyl‐4‐hydroxyphenyl)propanoate (MtBHPP)], the inhibitory effect was greater. Even at low concentrations (<1%), DETA and MtBHPP were effective at inhibiting the generation of known malodor molecules on fabrics. As DETA and MtBHPP meet performance, cost, and stability considerations, they hold promise for use in high‐quality commercial laundry detergent products designed to eliminate malodor on consumer fabrics.

中文翻译：

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洗衣粉配方中的铜助剂和抗氧化剂减少了织物上恶臭分子的形成

对于使用洗衣粉的消费者，最迫切需要的是减少即使在洗涤和干燥后仍会残留在织物上的恶臭。已知的气味来源是织物上残留皮脂的自氧化作用，导致形成一系列异味化合物。为了防止这种氧化过程，对两种技术进行了评估：（i）抗氧化剂以清除自由基；（ii）金属螯合剂以抑制铜离子作为催化剂参与自氧化过程。铜是汗水，土壤和市政供水的常见成分，尤其是在涉及铜管的地方，这在美国许多家庭和企业中很常见。为了进行评估，用人造皮脂处理织物样品，然后在商业洗衣机中用含有衣物洗涤剂的自来水洗涤，并使用商业干燥机进行干燥。以代表消费者家庭的水平向洗涤物中添加的铜大大增加了已知恶臭分子的形成。添加到洗涤液中的铜螯合剂[特别是二亚乙基三胺（DETA）]可有效抑制恶臭分子的形成。与抗氧化剂[特别是3-（3,5-二叔丁基-4-羟基苯基）丙酸甲酯（MtBHPP）]结合使用时，抑制作用更大。即使在低浓度（<1％）下，DETA和MtBHPP仍可有效抑制织物上已知恶臭分子的产生。由于DETA和MtBHPP满足性能，成本和稳定性方面的考虑，因此它们有望用于旨在消除消费类织物上的恶臭的高质量商用洗衣粉产品中。