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First Report on Rare Unifloral Honey of EndemicMoltkia petraea(Tratt.)Griseb. from Croatia: Detailed Chemical Screening and Antioxidant Capacity

Rare Moltkia petraea (Tratt.) Griseb. honey from Croatia was first time characterised. The spectrophotometric assays on CIE L*a*b*C-ab*h(ab)degrees colour coordinates, total phenol content and antioxidant capacity (FRAP, CUPRAC, DPPH center dot and ABTS(center dot+) assays) determined higher honey values generally close to dark honeys ranges. Headspace solid-phase microextraction (HS-SPME) on two fibres after GC-FID and GC/MS revealed the major compounds 2-phenylacetaldehyde (12.8% ; 15.6%), benzaldehyde (11.1% ; 10.0%), octane (9.3% ; 7.6%), nonane, propan-2-one, pentan-2-one, pentanal and nonanal (4.9% ; 14.5%). Ultrasonic solvent extraction (USE) mainly isolated non-specific higher molecular compounds characteristic of the comb environment. Targeted HLPC-DAD analysis of the honey determined higher concentration of phenylalanine (212.08 mg/kg) and lumichrome (16.25 mg/kg) along with tyrosine and kojic acid. The headspace composition (chemical fingerprint) and high concentration of lumichrome can be considered particular for M. petraea honey.

Moltkia petraea honey ; Antioxidant capacity ; HS-SPME and USE ; GC/MS ; HPLC-DAD ; Lumichrome

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