Abstract
This study was aimed at investigating the antioxidant, whitening, and moisture-retention properties of Lactobacillus rhamnosus spent culture supernatant (Lr-SCS) in cosmetic applications. Results reveal that Lr-SCS effectively and gradually scavenges 1,1-diphenyl-2-picrylhydrazyl as well as 2,2-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) radical cations, and increases reducing power in a dose-dependent manner. Additionally, Lr-SCS can also suppress tyrosinase activity in vitro and effectively promote moisture retention. Heat treatment at 100 °C for 30 min does not influence the functions of Lr-SCS. We conclude that Lr-SCS can be used effectively in skin care cosmetics.
Highlights
The World Health Organization defines probiotics as live microorganisms conferring a health benefit on the host when administered in adequate amounts
The objective of this study was to investigate the effectiveness of L. rhamnosus spent culture supernatant (Lr-SCS) in cosmetics, with the aim of developing a possible new green cosmetic material
Heat treatment is usually needed to test the stability of a cosmetic product
Summary
The World Health Organization defines probiotics as live microorganisms conferring a health benefit on the host when administered in adequate amounts. Probiotic bacterial cultures modulate the Molecules 2013, 18 growth of intestinal microbiota, potentially suppressing harmful bacteria and reinforcing the body’s natural defense mechanisms. There is currently an abundance of evidence on the positive effects of probiotics on human health [1,2,3,4,5]. Probiotics are typically bacteria of the species Lactobacillus or Bifidobacterium [6], which are natural components of the gut microbiota and are able to survive in the gut. Among lactic acid bacteria (LAB), members of the genus Lactobacillus are generally regarded as non-pathogenic because of their long history of safe use as health-promoting organisms in numerous fermented food products—e.g., dairy products, fermented vegetables, fish and sausages—as well as silage inoculants [5,7,8]. Lactobacillus rhamnosus (L. rhamnosus) has been shown to produce lactic acid as the only carbohydrate metabolism product [9,10]
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