doctoral thesis
Detection of adulteration in honeys by differential scanning calorimetry

Nela Nedić Tiban (2005)
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Food Technologies
Sub-department of Fruits and Vegetables Technology
Metadata
TitlePrimjena diferencijalne motridbene kalorimetrije za utvrđivanje patvorenja meda
AuthorNela Nedić Tiban
Mentor(s)Vlasta Piližota
Abstract
U radu je ispitana mogućnost utvrđivanja patvorenja meda poznatog botaničkog podrijetla pomoću diferencijalne motridbene kalorimetrije (DMK, engl. DSC). Uzorci monoflornih vrsta meda - bagrema, kadulje i kestena, i livade kao poliflorne vrste meda podvrgnuti su analizi kemijskog sastava, mjerenju boje, određivanju reoloških parametara, a proučavano je i njihovo termičko ponašanje pri niskim i visokim temperaturama. DMK krivulje poslužile su za dobivanje uvida u ponašanje ispitivanih vrsta meda u širokom temperaturnom području (od -100 do 220 °C), odnosno kao osnova za određivanje početne i srednje temperature staklastog prijelaza (Tg), promjene specifičnog toplinskog kapaciteta (cp) te izračunavanje entalpije taljenja (Hm). Odabranim uzorcima meda je u određenim udjelima (5, 10 i 20 %) dodan fruktozni sirup (kao moguće sredstvo za patvorenje meda) kako bi se ispitao utjecaj dodatka sirupa na termičko ponašanje različitih vrsta meda, odnosno da bi se istražilo kod koje količine sirupa je moguće utvrditi patvorenje meda. Obrada rezultata termičke analize pokazala je statistički značajnu razliku između nepatvorenog uzorka i patvorenih uzoraka meda kod svih udjela sirupa. Dodatak sirupa od 5 do 20 % je rezultirao u promjeni početne (engl. onset) i srednje (engl. midpoint) temperature staklastog prijelaza patvorenih uzoraka meda (snižavanje Tg vrijednosti) i u porastu vrijednosti entalpije taljenja. Promjena specifičnog toplinskog kapaciteta se nije pokazala dobrim parametrom za utvrđivanje prisutnosti sirupa. Mjerenje boje i određivanje reoloških svojstava patvorenih uzoraka meda poslužili su kao dodatne metode za utvrđivanje patvorenja meda.
Keywordshoney adulteration differential scanning calorimetry
Parallel title (English)Detection of adulteration in honeys by differential scanning calorimetry
Committee MembersTomislav Lovrić (committee member)
Vlasta Piližota (committee member)
Drago Šubarić (committee member)
GranterJosip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Lower level organizational unitsDepartment of Food Technologies
Sub-department of Fruits and Vegetables Technology
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Food Technology
Engineering
UDK638/639
APPLIED SCIENCES. MEDICINE. TECHNOLOGY
Apiculture. Keeping, breeding and management of insects and other arthropods. Hunting. Fishing. Fish breeding
578/579
NATURAL SCIENCES
Virology. Microbiology
Study programme typeuniversity
Study levelpostgraduate
Study programmeFood Engineering
Academic title abbreviationdr. sc.
Genredoctoral thesis
Language Croatian
Defense date2005-12-28
Parallel abstract (English)
In this work, differential scanning calorimetry (DSC) has been used for detection of adulteration in Croatian honeys of familiar botanical origin. Samples of monofloral honeys (acacia, sage, chestnut) and meadow, as a polifloral honey type, have been subjected to chemical analysis, colour measurement, determination of rheological parameters, as well as determination of thermal behaviour. DSC scans were used to determine behaviour of honey types under study in a very broad temperature range (from -100 to 220 °C), i.e. as a base for determining onset and midpoint glass transition temperatures (Tg), change of specific heat capacity (cp) and enthalpy of melting (Hm). The effect of syrup addition (at 5, 10 and 20 %) in honey samples and detection of honey adulteration was investigated. Results of thermal analysis showed statistically significant difference between authentic and adulterated honeys. Adulteration of the honeys with 5-20 % fructose syrup addition caused changes in both Tg (decreasing Tg values) and Hm (increasing Hm values). The variation of the specific heat capacity (cp) did not appear to be good parameter for detection of added syrup, as a possible honey adulterant. Measurements of colour and rheological properties determination of adulterated honey samples served as additional methods for detection of honey adulteration.
Parallel keywords (Croatian)med patvorenje diferencijalna motridbena kalorimetrija
Extent183 lista, 30 cm
Versionaccepted version
Resource typetext
Access conditionAccess restricted to students and staff of home institution
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
Noteaccepted version
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:109:033848
CommitterIvana Šuvak