You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Chemical"].

Please return the output as a JSON object of the format: {"Chemical": ["Arsenic", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Influence of pH, metal chelator, free radical scavenger and interfacial characteristics on the oxidative stability of β-carotene in conjugated whey protein-pectin stabilised emulsion. The influence of whey protein isolate (WPI)-beet pectin conjugates formed by dry-heating on the oxidative stability of β-carotene in O/W emulsions was studied. It was mainly focused on the influence of pH, metal chelator, free radical scavenger and interfacial characteristics on the degradation of β-carotene in the emulsion stabilised by conjugate. The conjugate increased the oxidative stability of β-carotene in the emulsion as compared to their unconjugated mixture at pH 7.0. The desferoxamine retarded β-carotene degradation at pH 4.0 more effectively than pH 7.0 and more effectively in the emulsion with the conjugate than the unconjugated mixture (p<0.05). The addition of 200mg/kg α-tocopherol significantly improved the stability of β-carotene in the conjugate stabilised emulsion. The emulsions were washed to remove conjugate not absorbed to the emulsion droplet interface, indicating that unabsorbed emulsifiers could protect β-carotene. It suggested that WPI-pectin conjugate could be used to protect bioactive lipids in emulsions.
{"Chemical": ["\u03b1-tocopherol", "desferoxamine", "\u03b2-carotene"]}