Porcine skin proteins were hydrolyzed using hydrothermal processing (HTP) and fractionated by membrane ultrafiltration (UF) into peptides with different molecular weights (1-10 kDa). The porcine skin hydrolysates (PSHs) were analyzed for their antioxidant, antiaging, and skin permeation properties. Additionally, the PSHs were incorporated into liposomes with different charges to maintain and/or enhance their beneficial effect. The results showed that both HTP and UF-II (1-3 kDa) had significantly high antioxidant and antiaging effects and good skin permeability. Based on the results for PSH-loaded liposomes, the best carrier for incorporating PSHs was a positively charged liposome that had been prepared using positively charged lipid. PSH loaded with positively charged liposomes (PSH/LIP-P) had the following droplet properties: 71.11 nm, 0.208 PDI (polydispersity index), and 38.37 mV. PSH/LIP-P also had an incorporation efficiency of 70.72%, and the liposomes maintained their physical droplet stability during storage.
Practical applicationsThe findings of this study highlighted porcine skin hydrolysates (PSH) produced by hydrothermal processing and membrane ultrafiltration with high antioxidant and antiaging effects and good skin permeability. PSH-loaded liposome capsules maintained a small size and high incorporation efficiency for PSH. The PSHs and PSH-loaded liposomes could be tested further for their in vivo functionality as nutraceutical or cosmeceutical ingredients. Hence, the finding could be useful information for developing potential commercial products in the food, cosmetics, and related industries.
K E Y W O R D Santiaging effect, antioxidant effect, charged liposome, incorporation, porcine skin hydrolysate
| I NTR OD U CTI ONThe functional food and cosmetic markets have grown rapidly over the last decade and are associated with consumer awareness of their roles in preventing disease and promoting health (Khiari, Ndagijimana, & Betti, 2014). Collagen has been widely used in food, cosmetics, pharmaceuticals, and medical applications due to its biological and functional properties (Li, Jia, & Yao, 2009;Zeng, Zahng, Adhikari, & Mujumdar, 2013). It is a fibrous insoluble protein that is mostly found in skin, cartilage, and connective tissues; it constitutes up to 30% of all body proteins and is the most abundant animal protein (Johnston, 1990). Recently, there has been interest in collagen with novel biologi- Each approach has advantages and limitations (McClements, 2014(McClements, , 2015. Liposomes are particularly suitable carriers for peptide delivery because they can encapsulate polar, nonpolar, and amphiphilic acids from protein hydrolysates (Mohan et al., 2016). In addition, liposomes can be easily produced from food grade materials; they can trap and release hydrophilic and hydrophobic ingredients and facilitate targeted actions (Jeon, Yoo, & Park, 2015).Therefore, the objective of this study was to produce porcine skin hydrolysates (PSHs) and investigate their antioxidant activity and phy...