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:

Isomerisation of carrot β-carotene in presence of oil during thermal and combined thermal/high pressure processing. The effect of thermal processing (85-130°C) and combined thermal/high pressure processing (100°C combined with 0.1 to 700 MPa and 700 MPa combined with 85-115°C) on β-carotene isomerisation in an olive oil/carrot emulsion and pure olive oil phase enriched with carrot β-carotene was investigated. Thermal processing always resulted in an increase in the contribution of the cis-isomers, with the increase being more pronounced at higher temperatures. In the oil/carrot emulsion, less β-carotene isomerisation was observed during combined thermal/high pressure processing compared to thermal processing. This effect was attributed to strengthening of the carrot cell walls under high pressure, thereby hindering the transfer of β-carotene to the oil phase and lowering its susceptibility to isomerisation. In an oil phase enriched with β-carotene, β-carotene isomerisation was not influenced by the applied pressure at 100°C and became almost temperature insensitive at 700 MPa.
{"Chemical": ["\u03b2-carotene"]}