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

Abstract

Rare Moltkia petraea (Tratt.) Griseb. honey from Croatia was first time characterised. The spectrophotometric assays on CIE L*a*b*C *h ° colour coordinates, total phenol content and antioxidant capacity (FRAP, CUPRAC, DPPH and ABTS 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.

Honey Extracts Exhibit Cytoprotective Properties against UVB-Induced Photodamage in Human Experimental Skin Models

“…Our results showed that all honey extracts exhibited significant antioxidant activity that may be related with their phenolic and flavonoid content. This finding is in accordance with previous studies demonstrating the antioxidant properties of honey extracts [51][52][53][54][55][56][57]. Interestingly, a strong correlation between the TPC and the antioxidant capacity of honey has been reported by a great number of studies [58][59][60].…”

Insight into the Chemical Diversity of Late/Ice Harvest Gewürztraminer Wine

“…The headspace solid‐phase microextraction was performed by manual sampler (Supelco) using the fiber polydimethylsiloxane/carboxene/divinylbenzene (PDMS/CARB/DVB) as described in the previous articles. [ ][ ] The extraction time was 45 min, and the sample was equilibrated at 60 °C for 15 min. The extraction was performed in triplicate and each replicate was analyzed by gas chromatography and mass spectrometry (GC/MS).…”

Bioactive compounds in Apis mellifera monofloral honeys

“…The S. montana honey had a DPPH radical-inhibition activity of 0.5-1.0 mmol TEAC/kg and a ferric-reducing antioxidant activity between 2.5 and 5.1 mmol Fe 2+ /kg. The chemical profile, analyzed by HPLC-DAD, revealed the presence of syringic acid (0.10-1.70 mg/kg) (Jerković et al, 2015). This compound has antidiabetic activity in experimental models of mice with diabetes (Muthukumaran et al, 2013).…”

“…Another monofloral honey from Croatia, derived from Moltkia petraea from the Biokovo mountains, was analyzed for its antioxidant activity (FRAP, DPPH, and ABTS) (Jerković et al., 2017). The results showed a moderate antioxidant activity by means of the FRAP test.…”