Nina Knezovic

Ms. Nina Knezovic

orcid

Research Focus & Metrics

Academic Career Length

2Years (2025-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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22 March 2025 in Nutrients
Verified
Journal Article
Open access
PDF file
ZKZlatka Knezovic
Zlatka Knezovic
BZBranka Jurčević Zidar
Branka Jurčević Zidar
APAjka Pribisalic
Ajka Pribisalic
SLSanja Luetić
Sanja Luetić
KJKatarina Jurcic
Katarina Jurcic
DSDavorka Sutlovic
Davorka Sutlovic
Background/Objectives: Artificial sweeteners (ASs) are food additives used to impart sweetness to various food products. Common sweeteners used individually or in combination include acesulfame-K, aspartame, cyclamate, saccharin, sucralose, and neotame. While traditionally considered harmless, emerging research suggest potential health implications. This study aims to analyze commonly consumed food products in Croatia for ASs presence, quantify four ASs, and estimate daily intake of ASs. Additionally, product labeling was assessed for compliance with Regulation 1169/2011 on food information to consumers. Methods: This study assessed the presence of acesulfame-K, aspartame, cyclamate, and saccharin dihydrate in 121 frequently consumed food products from the Croatian market using a high-performance liquid chromatography method. Based on obtained concentrations, data from a parallel consumption study, and existing literature on acceptable daily intake (ADI), we assessed exposure to ASs. Results: ASs were found in a substantial proportion of analyzed products, with multiple sweeteners often present in a single product. Specifically, ASs were detected in 74% of carbonated drinks, 54% of fruit juices, 86% of energy drinks, 70% of high-protein milk products, and 66% of chewing gums. Hypothetical consumption scenarios demonstrated that children, due to their low body mass, are at the highest risk of exceeding ADI values. Conclusions: The widespread presence of ASs in food products raises concerns about excessive intake, particularly among children who frequently consume soft drinks, instant beverages, and protein drinks. These findings highlight the need for further research into cumulative ASs exposure and its potential health effects, as well as the importance of public health strategies to regulate ASs consumption.

27 February 2025 in Nutrients
Verified
Journal Article
Open access
PDF file
BZBranka Jurčević Zidar
Branka Jurčević Zidar
ZKZlatka Knezovic
Zlatka Knezovic
APAjka Pribisalic
Ajka Pribisalic
SLSanja Luetić
Sanja Luetić
KJKatarina Jurcic
Katarina Jurcic
DSDavorka Sutlovic
Davorka Sutlovic
Background/Objectives: Artificial sweeteners are commonly used food additives that provide sweetness without calories. Once considered harmless due to their lack of metabolism, recent studies suggest that they may have unintended effects, potentially stimulating appetite and increasing food intake, leading to weight gain. This study aimed to assess consumer perceptions of artificial sweeteners in food, examine consumption frequencies of products containing them, and explore their potential influence on body mass index. Methods: A cross-sectional study was conducted using two voluntary and anonymous surveys administered via Google Forms. Results: The study included 649 participants: 324 parents of preschool and school-aged children and 325 university and secondary school students. A substantial proportion of parents (59.3%) recognized artificial sweeteners as common sugar substitutes in beverages like juices, soft drinks, and protein drinks. Awareness was notably higher among students (88.9%). While most participants held a negative attitude toward artificial sweeteners, their awareness and engagement with food label reading were low. Multivariate linear regression identified significant associations: Male gender (β = 1.17, p < 0.001) and older age (β = 0.42, p < 0.001) were associated with higher BMI. Additionally, participants who rarely or never consumed carbonated soft drinks had a lower BMI (β = −1.48, p = 0.039), while those who occasionally consumed snacks had a higher BMI (β = 0.51, p = 0.039). Conclusions: This research underscores the urgent need for public health initiatives addressing misconceptions, raising food label reading practices, while encouraging healthier consumption habits through educational campaigns. Additionally, the study’s insights will help assess the potential cumulative health impacts of artificial sweetener intake.

21 December 2025 in Antioxidants
Verified
Journal Article
Open access
PDF file
NKNina Knezovic
Nina Knezovic
APAjka Pribisalic
Ajka Pribisalic
KJKatarina Jurcic
Katarina Jurcic
ILIvica Ljubenkov
Ivica Ljubenkov
BSBarbara Soldo
Barbara Soldo
ZKZlatka Knezovic
Zlatka Knezovic
Background: Olive cultivation and olive oil production are key agricultural sectors in the Dalmatia region, where numerous oil mills operate. Analyses have shown that extra virgin olive oils (EVOO) produced in this area contain respectable amounts of polyphenols, which contribute to superior oil quality due to their antioxidant properties. During processing, hydrophilic phenolic compounds predominantly transfer into olive mill wastewater (OMW), making it a concentrated source of valuable bioactive molecules. The antioxidant, anti-inflammatory, and photoprotective effects of these polyphenols are highly relevant for cosmetic and pharmaceutical use. Methods: A total of 186 OMW samples were collected from oil mills in the Split-Dalmatia County across three production seasons (2023–2025). Total polyphenol content (TPC) was measured spectrophotometrically, while polyphenol composition was determined by High Performance Liquid Chromatography (HPLC). Antioxidant activity was evaluated using hydrogen atom transfer (HAT; 2,2-diphenyl-1-picrylhydrazyl) (DPPH), electron transfer (ET; ferric reducing antioxidant power) (FRAP), and oxygen radical absorbance capacity assay (ORAC). Results: The obtained results indicated high total polyphenols concentrations, with values ranging from 111.8 to 6717.2 mg of gallic acid equivalents per L of OMW (mg GAe L−1). In the vast majority of analyzed samples, hydroxytyrosol was the predominant phenol compound. The antioxidant activity of the samples was high.

10 February 2026 in Toxics
Verified
Journal Article
Open access
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BMBianka Mimica
Bianka Mimica
APAjka Pribisalic
Ajka Pribisalic
ZKZlatka Knezovic
Zlatka Knezovic
NKNina Knezovic
Nina Knezovic
DSDavorka Sutlovic
Davorka Sutlovic
Prenatal exposure to essential and toxic metals may influence fetal development and birth outcomes. Meconium represents a valuable biomarker of cumulative intrauterine exposure; however, data linking maternal lifestyle and diet to meconium metal concentrations remain limited. This study included 152 mother–newborn pairs at the University Hospital Center Split. Meconium samples were analyzed for essential metals (Mn, Zn, Fe, Cu) and toxic metals (Hg, Pb, Cd, Ni, Cr) using atomic absorption spectrometry. Maternal and newborn characteristics were collected via questionnaires and medical records. Associations between maternal factors and metal concentrations were assessed using multivariable regression, and inter-metal correlations were evaluated with Spearman’s rank correlation. The correlation matrix indicates positive correlations among essential metals, particularly between Fe and Cu (rs = 0.523), whereas toxic metals show mixed correlation patterns. Maternal factors were associated with several metal concentrations: zinc was positively associated with the newborn ponderal index; greater gestational weight gain and longer gestation were associated with lower iron concentrations; frequent fruit or grain consumption was associated with lower copper concentrations; frequent milk/dairy intake was associated with lower mercury; and fish consumption was associated with higher mercury and manganese. Rural residence and lower smoking intensity were associated with lower lead concentrations, while higher pre-pregnancy body mass index and frequent maternal smoking were associated with increased cadmium. No significant associations were observed for nickel or chromium. These findings highlight the influence of maternal diet, lifestyle, and environmental factors on fetal metal exposure, underscoring the need for monitoring, food safety control, and targeted education during pregnancy.

29 July 2026 in Antioxidants
Verified
Journal Article
Open access
PDF file
NKNina Knezovic
Nina Knezovic
APAjka Pribisalic
Ajka Pribisalic
BSBarbara Soldo
Barbara Soldo
ILIvica Ljubenkov
Ivica Ljubenkov
RMRoberta Frleta Matas
Roberta Frleta Matas
ZKZlatka Knezovic
Zlatka Knezovic
Olive mill wastewater (OMW) is an environmentally problematic effluent but also a rich source of antioxidant phenolic compounds. This study evaluated an integrated recovery approach combining cationic starch clarification and adsorption resin purification for obtaining phenolic-rich fractions from Dalmatian OMW. A pooled OMW sample was characterized for conventional wastewater parameters and total phenolic content (TPC), clarified with four commercial cationic starches, and subsequently processed using Seplite LXA84, Seplite LXA88, Seplite LXA816, and Amberlite XAD4 adsorption resins. PrimePHASE 2545 at 1000 mg active substance L−1 provided the most favorable balance between matrix removal and phenolic retention, reducing suspended solids and organic load while preserving approximately 92% of the initial TPC. In the preliminary resin screening, Seplite LXA84 produced the most favorable ethanol eluate, with the highest phenolic recovery and strong antioxidant activity, particularly in FRAP and ORAC assays. HPLC profiling confirmed hydroxytyrosol as the dominant recovered phenolic compound, accompanied by tyrosol and selected phenolic acids. These findings support a two-stage OMW valorization approach in which cationic starch pretreatment improves the suitability of OMW for column processing, while resin adsorption produces phenolic-rich fractions with antioxidant activity that may serve as candidates for further purification, characterization, and application-oriented research.