Wenjie Zhang: Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China; Department of Clinical Nutrition, College of Health Science and Technology, Shanghai Jiao Tong University School of Medicine, Shanghai 200135, China; Medical Food Laboratory, Shanghai Institute for Pediatric Research, Shanghai 200092, China; National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China.
Lijia Chen: Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China; Department of Clinical Nutrition, College of Health Science and Technology, Shanghai Jiao Tong University School of Medicine, Shanghai 200135, China; Medical Food Laboratory, Shanghai Institute for Pediatric Research, Shanghai 200092, China; National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China.
Qiqi Bian: Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China; Department of Clinical Nutrition, College of Health Science and Technology, Shanghai Jiao Tong University School of Medicine, Shanghai 200135, China; Medical Food Laboratory, Shanghai Institute for Pediatric Research, Shanghai 200092, China; National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China.
Zhengquan Wang: National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China. Electronic address: zq-wang@shou.edu.cn.
Xichang Wang: National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China.
Jian Zhong: Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China; Department of Clinical Nutrition, College of Health Science and Technology, Shanghai Jiao Tong University School of Medicine, Shanghai 200135, China; Medical Food Laboratory, Shanghai Institute for Pediatric Research, Shanghai 200092, China; National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, College of Food Science & Technology, Shanghai Ocean University, Shanghai 201306, China; Marine Biomedical Science and Technology Innovation Platform of Lingang Special Area, Shanghai 201306, China. Electronic address: jzhong@shsmu.edu.cn.
Herein, 12 types of fish oil emulsions were used to prepare 12 types of spray-dried fish oil powders with three gelatins (positive fish gelatin, positive porcine skin gelatin, and negative bovine skin gelatin), two negative pectins (high and low methoxy pectin), and negative sodium starch octenyl succinate (SSOS). The powders consisted of microscale capsules with bi- or monolayer oil/wall interfaces, and monolayer wall layers. SSOS significantly decreased the bulk and tapped densities of the powders. All powders had low water activities (0.14-0.26). Gelatin/pectin and gelatin/pectin/SSOS powders had encapsulation efficiencies of 45.1 %-75.9 % and 70.1 %-93.0 %, respectively. The oxidative stability depended on the compositions of the powder wall layers. FG/LMP/SSOS wall layer induced the lowest PV peak value (325 �� 15 mmol/kg oil). BSG/HMP/SSOS wall layer induced the highest PV peak value (1273 �� 49 mmol/kg oil). The free fatty acid release percentages in the in vitro digestion system depended on the structures and compositions of oil/wall interfaces. FG@LMP/SSOS interface induced the lowest FFA release percentage (33.9 % �� 1.7 %) and BSG/HMP interface induced the highest FFA release (79.3 % �� 8.1 %). The results suggested useful information on the effect of oil/wall interfaces and wall layers on the preparation and properties of fish oil powders.
