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Custodio-Mendoza, J.A.; Ares-Fuentes, A.M.; Carro, A.M. Microextraction Techniques in Lipid Peroxidation Product Detection. Encyclopedia. Available online: https://encyclopedia.pub/entry/50666 (accessed on 07 May 2024).
Custodio-Mendoza JA, Ares-Fuentes AM, Carro AM. Microextraction Techniques in Lipid Peroxidation Product Detection. Encyclopedia. Available at: https://encyclopedia.pub/entry/50666. Accessed May 07, 2024.
Custodio-Mendoza, Jorge A., Ana M. Ares-Fuentes, Antonia M. Carro. "Microextraction Techniques in Lipid Peroxidation Product Detection" Encyclopedia, https://encyclopedia.pub/entry/50666 (accessed May 07, 2024).
Custodio-Mendoza, J.A., Ares-Fuentes, A.M., & Carro, A.M. (2023, October 23). Microextraction Techniques in Lipid Peroxidation Product Detection. In Encyclopedia. https://encyclopedia.pub/entry/50666
Custodio-Mendoza, Jorge A., et al. "Microextraction Techniques in Lipid Peroxidation Product Detection." Encyclopedia. Web. 23 October, 2023.
Microextraction Techniques in Lipid Peroxidation Product Detection
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This entry is adapted from the peer-reviewed paper 10.3390/separations10100531

Lipid peroxidation, the most aggressive reaction in food, results in the formation of reactive organic compounds that detrimentally impact food sensory qualities and consumers’ health. While controlled lipid peroxidation can enhance flavors and appearance in certain foods, secondary peroxidation products lead to sensory deterioration in a variety of products, such as oils, alcoholic beverages, and meat. Dispersive liquid-liquid microextraction (DLLME), solid-phase microextraction (SPME), and gas-diffusion microextraction (GDME). These techniques offer efficient and sensitive approaches to extracting and quantifying lipid oxidation products and contribute to the understanding of oxidative deterioration in various food products. 

food analysis gas-diffusion microextraction lipid peroxidation dispersive liquid-liquid microextraction solid-phase microextraction

1. Introduction

Lipid peroxidation, autooxidation, or oxidative rancidity, is the most aggressive reaction in food that results in the formation of reactive organic compounds [1]. These compounds have an adverse effect on the sensory qualities of food and can potentially harm consumer health [1][2]. Lipid peroxidation is driven by the complex interaction of polyunsaturated fatty acids (PUFA) with reactive oxygen species (ROS) (Figure 1), resembling free radical reactions [3]. Exposure to factors like light, heat, or metallic ions initiates the process by releasing hydrogen atoms, forming radical carbonations. These radicals rearrange to create conjugated systems [1][2][4]. Atmospheric oxygen reacts with these conjugated dienes, generating peroxide radicals that sustain the chain reaction [3][4]. Although lipid peroxides are relatively stable, further degradation occurs through heat or metal ions, resulting in more stable secondary products [3][5]. The extent of autooxidation varies based on factors such as storage conditions, oxygen levels, and lipid composition, with the number of unsaturated bonds in the fatty acid influencing the susceptibility [5][6][7].
Figure 1. Pathway of lipid peroxidation.
Controlled lipid peroxidation possesses positive effects, enhancing the flavors in certain products like aged cheese, roasted coffee beans, and toasted nuts [8][9]. However, secondary lipid peroxidation products can lead to sensory deterioration and off flavors in various foods, including oils, alcoholic beverages, meat, milk, and dairy products [9][10][11][12][13]. The susceptibility to autooxidation varies among different edible oils, with olive oil’s resistance attributed to its high phenolic content [10][14]. Alcoholic beverages, such as wine and beer, can develop lipid peroxidation products due to the interaction of PUFA in the raw materials with lipid peroxidation factors during production and fermentation [15][16]. Yeast metabolism in alcohol fermentation can also contribute to generating ROS, accelerating oxidative rancidity [17]. Extended periods of aging and storage, common in wines, further expose them to oxidative conditions [18]. Meat products, processed through grinding, cutting, and packaging, expose more surface area to ROS, promoting lipid peroxidation, which is exacerbated by extended storage times, especially under improper conditions [12][19]. Additionally, food products made from meat or fish are high in protein, PUFA and monounsaturated fatty acids (MUFA), and salt can experience protein deterioration due to primary (hydroperoxides) and secondary (aldehydes, ketones) lipid oxidation products reacting with free proteins, peptides, and amino acids [12][19].
Excessive lipid peroxidation can have adverse health effects by producing secondary peroxidation products that interact with biomolecules (proteins, peptides, nucleic acids, and other lipids) within cells, potentially leading to toxic and mutagenic effects [1][2][3].
These secondary lipid peroxidation products can follow two pathways: they can break down into carbonyl compounds like aldehydes, ketones, and alcohols [1][2], or undergo cyclization to form malondialdehyde, which can then dehydrate into acrolein [20].
The International Agency for Research on Cancer (IARC) classifies certain secondary peroxidation products based on their potential carcinogenic hazards to humans [21]. This classification (Table 1) categorizes compounds according to their level of evidence as carcinogens into different groups: Category 1, indicating sufficient evidence of its carcinogenicity to humans, Category 2A, suggesting they are probably carcinogenic to humans based on limited evidence. Category 2B, indicating that they are possibly carcinogenic to humans, supported by limited evidence, and Category 3, indicating insufficient evidence for their carcinogenicity.
Table 1. Classification of secondary lipid peroxidation products based on their carcinogenetic and recommended exposure levels.
Secondary Product CAS Number IARC Category Tolerable Daily Intake
µg/Kg bw/Day		 Reference
Saturate Carbonyls Formaldehyde 50-00-0 1 150 [22]
Acetaldehyde 75-07-0 2B 185 a [23]
Hexanal 66-25-1 - 780 * [24]
α,β-Unsaturated Carbonyls Acrolein 107-02-8 2A 7.5 [25]
4-hydroxy-2-nonenal 75899-68-2 3 1.5 ** [26]
4-hydroxy-2-hexenal 17427-21-3 3 1.5 ** [26]
Acrylamide 79-06-1 2A NE [27]
Crotonaldehyde 4170-30-3 2B - -
Dicarbonyls Malondialdehyde 102-52-3 3 30 ** [26]
Glyoxal 107-22-2 - 200 [28]
Methylglyoxal 78-98-8 3 - -
Diacetyl 431-03 - 900 * [28]
Furans Dihydro-2(3H)-furanone 96-48-0 3 - -
Furfural 98-01-1 3 500 [29]
IARC, International Agency for Research on Cancer; bw, body way; a Acceptable intake reported at µg/day; * Acceptable daily intake; ** Threshold of toxicological concern set by The International Programme on Chemical Safety (IPCS); NE, non-established.
Additionally, the European Food Safety Authority (EFSA) establishes tolerable daily intake values based on available toxicological information [26][27][28][29][30]. In cases where toxicological data are lacking for certain secondary peroxidation products, safety measures such as Acceptable Daily Intake (ADI) or Threshold of Toxicological Concern (TTC) can be applied [31].
Quantifying primary peroxidation products is challenging due to their reactivity and volatility [32]. Therefore, the measurement of secondary lipid peroxidation products is commonly used as biomarkers to monitor oxidative stress within cells [33]. Additionally, these products can serve as markers of food quality to assess the oxidative state of food products [34]. Various analytical techniques have emerged in recent years for analyzing and quantifying carbonyl compounds, with applications in food, biological, and environmental studies [33][35]. These methods primarily involve spectrometry and chromatography technologies [35]. A direct measurement of carbonyl compounds offers non-destructive and specific approaches, minimizing sample contamination risks due to their natural occurrence [35][36][37][38]. Direct methods for carbonyl compound analyses in food mainly employ flame ionization detectors (FID) and electron capture detectors (ECD). However, they may have increased detection limits due to potential analyte degradation within the detector [36][37][38]. In contrast, indirect methods offer a way to detect secondary peroxidation products by forming carbonyl adducts, which are determined using ultraviolet (UV), fluorescence (FLD), and mass spectrometry (MS) [10][39][40][41][42][43].
The traditional thiobarbituric acid (TBA) reactive substances (TBARS) assay has been employed to determine carbonyl compounds as lipid peroxidation products in biological and food samples [39]. This assay involves the reaction with TBA to form a chromophore detectable by spectrophotometric methods [39][43]. However, TBARS lack specificity due to interactions with various organic compounds [39]. Therefore, some applications incorporate a separation step, often via liquid chromatography (LC), before determination [43]. Other derivatization reagents, such as hydrazines, react with carbonyl compounds to form hydrazones, detectable spectroscopically after LC or gas chromatography-mass spectrometry (GC-MS) [40][41][42]. Phenyl hydrazine (PH) and derivatives such as 2,4-Dinitrophenylhydrazine (DNPH) and 2,3,4,5,6-pentafluorophenylhydrazine (PFPH) are commonly used for this purpose [40][41][42].
The choice of a sample preparation method depends on various factors, including the sample’s state (solid, liquid, gas), size, the analytical technique used, the type of analysis, properties of the analyte, and its initial concentration [44]. Traditional sample preparation methods often involve significant quantities of organic solvents, multiple steps, and result in substantial waste and time consumption [45]. An ideal sample preparation method should be simple, time efficient, cost effective, rugged, potentially automated, and align with the principles of green analytical chemistry, with a focus on minimizing sample, solvent, and waste usage [44][45]. Furthermore, simultaneous derivatization and extraction can reduce the overall analysis time while enhancing sensitivity and specificity [46]. In response to these needs, novel microextraction-based methods have emerged. Microextraction involves using a small volume of an extracting phase compared to the sample volume [47][48][49][50]. While it may not achieve exhaustive extraction, it significantly increases the concentration of the analyte in the extractive phase, reducing solvent usage [47][48][49][50]. The efficiency of microextraction depends on how the analyte partitions between the matrix and the extractive phase [51]. Since partitioning is not affected by analyte concentration, quantification is based on the absolute amount extracted [52]. The affinity of the analyte for the extraction phase determines the quantity extracted [51][52]. Moreover, microextraction operates on equilibrium, where extraction time determines the system’s equilibrium position [53]. Once equilibrium is reached, no further analyte extraction occurs [51][52][53]. Microextraction can also serve as a pre-concentration step before analysis [49][50][51].
Microextraction techniques, including dispersive liquid-liquid microextraction (DLLME), solid-phase microextraction (SPME), and gas-diffusion microextraction (GDME), have gained prominence in the analysis of lipid peroxidation in food. These techniques provide efficient and sensitive approaches to extracting and quantifying lipid oxidation products, thereby contributing to understanding the oxidative deterioration of food products. 

2. Gas Diffusion Microextraction

GDME (Figure 2) was introduced to the scientific community through the Journal of Separation Science in 2010 [48].
Figure 2. Scheme of gas-diffusion microextraction (GDME).
GDME is a versatile and efficient technique offering several advantages in addressing food matrices complexities. Its selective extraction capability allows the isolation of specific target compounds from complex mixtures, ensuring precise analysis even in interfering components. GDME operates through passive diffusion, with target compounds migrating from the sample matrix into an acceptor phase, usually a liquid solution containing a derivative reagent. This process involves placing the acceptor phase in the GDME module containing a microporous hydrophobic membrane, typically a 5.0 µm PTFE membrane, which supports the acceptor phase. Equilibrium is established between the sample and acceptor phases, and the acceptor phase is collected for analysis. GDME’s minimal sample requirements make it well suited for limited availability, while its reduced solvent usage aligns with the trend of green analytical chemistry [45]. GDME exhibits high sensitivity, when coupled with sensitive detection methods like GC-MS or high-performance liquid chromatography-ultraviolet (HPLC-UV). This empowers the quantification of trace-level compounds in food analyses [10][48][54][55][56][57][58][59][60][61][62].
From quality control to monitoring changes during storage and processing, GDME’s synergy with analytical techniques such as GC and HPLC unveils the intricacies of food composition and quality, setting its status as an indispensable tool in modern food analysis practices. Its selective enrichment capabilities enhance the detectability of compounds, making GDME valuable for trace analysis. In practice, GDME is employed for discerning volatile aroma compounds, evaluating off flavors, assessing lipid oxidation products, and analyzing a spectrum of other volatile constituents. Additionally, GDME’s non-destructive nature preserves the integrity of samples for further investigations, enhancing the versatility of its applications across various food products, including solid (bread and coffee beans), liquid (beer, wine, soy sauce), and semi-liquid (vegetable oils) foods. Table 2 presents a comparison of the methods developed for the analysis of carbonyl compounds using GDME.
Table 2. Analytical method for determination of secondary peroxidation products by gas-diffusion microextraction (GDME).
Target Compound Sample GDME Derivative Reagent Determination LOD
µg/L or µg/Kg		 Recovery
%		 Ref.
Mode Vacceptor solution
mL		 t
min		 T
°C
1,3-pentadione
Diacetyl		 Beer Immersed 0.5 15 40 O-PDA HPLC-UV 3.8–4.6 - [48]
2 aldehydes &
Furfural		 Beer Immersed 0.75 5 30 DNPH HPLC-UV 1.5–12.3 - [54]
5 aldehydes Beer Suspended 0.5 20 40 HBA HPLC-DAD 1.2–1857.7 >96% [55]
Diacetyl 1 Wine Immersed 0.4 20 65 O-PDA HPLC-UV 3.8 - [56]
Acetaldehyde 1 Wine Immersed 1.0 15 50 DNPH HPLC-UV 800–1100 - [57]
Diacetyl Wine & beer Suspended 1.0 10 60 O-PDA DPV 0.053 - [58]
α-DCC Wine; black tea & soy sauce Immersed 2 0.5 10 55 O-PDA HPLC-UV 50–200 - [59]
MDA Vegetable oil Suspended 0.5 30 65 TBA HPLC-UV/FLD 250–350 ≥82% [60]
4 aldehydes Acrolein & MDA Vegetable oil Suspended 1.0 10 60 DPNH GC-MS 50–100 ≥95% [10]
2 ketones & diacetyl Ground bread Suspended 0.5 15 65 O-PDA HPLC-UV 6–12 - [61]
27 carbonyl compounds 3 Green & roast coffee beans Suspended 0.5 16 40 O-PDA HPLC-DAD 50–200 - [62]
1 free and total; 2 0.22 um PVDF membrane; 3 Qualitative analysis; LOD, limit of detection; Ref., reference; DNPH, 2,4-dinitrophenylhydrazine; HBA, 4-hydrazinobenzoic acid; O-PDA, O-phenylenediamine; α-DCC, α-dicarbonyl compounds; MDA, malondialdehyde; TBA, 2-thiobarbituric acid; DPV, differential pulse voltammetry.

3. Solid-Phase Microextraction

SPME (Figure 3) is a well-established sample preparation technique commonly used in analytical chemistry to extract and concentrate target compounds from various sample matrices before analysis [49][51][63].
Figure 3. Scheme of solid-phase microextraction (SPME).
SPME finds particular utility in extracting volatile and semi-volatile compounds from complex matrices, especially in food analysis. SPME involves a fiber coated with a thin layer of an absorbent material, which is exposed to the sample to extract the analytes of interest [49][63]. The SPME process comprises several key steps: equilibration, when the SPME fiber is exposed to the sample (either in immersed mode or sample headspace) to allow analytes to partition between the sample matrix and the fiber coating, adsorption, when the analytes are absorbed onto the fiber coating, concentrating them from the sample matrix, and desorption of the analytes from the fiber coating to the analytical instrument for analysis [63].
The application of SPME for analyzing lipid peroxidation products is well justified due to its selective extraction capabilities, which minimize interference from complex matrices. SPME simplifies sample preparation by concentrating trace amounts of these compounds, enhancing sensitivity, and eliminating the need for extensive cleanup steps [49][63]. Furthermore, its reduced solvent usage aligns with environmental concerns [63]. SPME’s adaptability to various sample types enables real-time monitoring, making it versatile for studying lipid peroxidation in biological, food, and other samples [49][63]. Its compatibility with quantitative and qualitative analytical techniques, coupled with its ability to mitigate matrix effects, further underlines its value as a technique for accurate and comprehensive lipid peroxidation product analysis (Table 3).
Table 3. Analytical methods for determination of secondary peroxidation products by solid-phase microextraction (SPME).
Target Compound Sample SPME Derivative Reagent Determination LOD
µg/L or µg/Kg		 Recovery
%		 Ref.
Mode t
min		 T
°C		 Fiber Tdesorption
°C
14 aldehydes & ketones Vegetable oil HS 30 20 DVB/CAR/PDMS 270 - GC-FID & GC-MS 0.04–2.24 - [64]
4-HNE Oils & porcine liver DI 15 40 PDMS/DVB   DNPH HPLC-SP 0.001–1.42 66–87% [65]
MDA Cod liver oil HS 10 RT PDMS/DVB 200 N-MH GC-NPD 0.74 91% [66]
Hexanal Hazelnut HS 10 60 CAR/PDMS 300 - GC-FID 8.01 - [67]
7 aldehydes Peanut, soybean and olive oils HS 15 50 CAR/PDMS 250 - GC-FID 4.6–10.2 85–110 [68]
3 α,β-UC Sunflower oil digestion phases HS 60 50 DVB/CAR/PDMS 250 - GC-MS - - [69]
100 carbonyl compounds Cod liver oil HS 60 50 DVB/CAR/PDMS 220 - GC-MS - - [70]
18 VOC Sunflower oil emulsions HS 30 50 DVB/CAR/PDMS 250 - GC-MS - - [71]
Aldehydes & 2-pentylfuran Soybean oils HS 55 50 DVB/CAR/PDMS 250 - GC-MS - - [72]
VOC Peanut oil HS 40 50 PDMS/DVB 250 - GC-MS - - [73]
4 aldehydes & 1 ketone Roast & boiled duck HS 40 45 CAR/PDMS 280 - GC-MS - - [74]
3 aldehydes Chicken patties HS 10 60 DVB/CAR/PDMS 250 - GC-FID - - [75]
Hexanal Pig sausages HS 30 50 DVB/CAR/PDMS 220 - GC-MS - - [76]
2 aldehydes & 2 dialdehydes Cod HS 30 50 CAR/PDMS 260 - GC-FID - - [77]
8 aldehydes Fish HS 15 60 PDMS/DVB 260 PFBHA GC-MS 1.4–6.1 79–102 [78]
6 aldehydes Caviar HS 30 60 DVB/CAR/PDMS 250 - GC-MS - - [79]
198 VOCs Dry cured meat HS 30 37   260 - GC-MS - - [80]
Aldehydes Infant formula HS 10 25 PDMS/DVB 250 - GC-MS - - [81]
3 aldehydes & pentane Infant formula HS 45 37 CAR/PDMS 250 - GC-FID 0.02–1.05 - [82]
13 Carbonyl compounds Milk powder HS 45 43   250 - GC-MS 2–6 - [83]
VOC Smoked cheese HS 45 50 CAR/PDMS 260 - GC-MS - - [84]
VOC Mozzarella HS 15 37   220 - GC-MS - - [85]
VOC Portuguese cheese HS 45 50 DVB/PDMS 250 - GC-MS - - [86]
9 aldehydes Beer HS 60 50 PDMS/DVB 250 PFBHA * GC-MS - 89–114 [87]
41 carbonyl compounds Beer HS 40 60 PDMS/DVB 250 PFBHA *,** GC-MS 0.003–20,000 - [88]
250 carbonyl compounds Beer HS 20 45 PDMS/DVB 250 PFBAH ** GC-ITMS 0.003–0.510 88–114 [89]
6 carbonyl compound Beer HS 60 55 DVB/CAR/PDMS 250 TFEH ** GC-MS 0.03–0.5 90–105 [16]
6 carbonyl compound Craft beer HS 60 55 DVB/CAR/PDMS 250 TFEH ** GC-MS 0.03–0.5 90–105 [90]
18 carbonyl compound Wine HS 45 40 DVB/CAR/PDMS 250 - GC-ITMS 0.62–129.2 19–190 [91]
80 VOC Wine HS 30 40 DVB/CAR/PDMS 240 - GC-MS - - [92]
6 carbonyl compound Syrah wines HS 45 55 DVB/CAR/PDMS 250 TFEH GCxGC-TOFMS 0.5–5.2 90–106 [93]
3 aldehydes Must & wine HS 45 55 DVB/CAR/PDMS 250 TFEH GC-qMS 0.1–0.8 90–102 [94]
38 carbonyl compound Port wine HS 20 32 PDMS/DVB 250 PFBHA GC-MS 0.006–0.089 88–119 [95]
45 carbonyl compound Wine HS 20 40 PDMS/DVB 250 PFBHA GC-MS/MS - 71–146 [96]
9 aldehydes Spirits and alcoholic beverages DI 15 20 PDMS 250 PFBHA GC-ECD 0.05–0.5 - [97]
VOC & SVOC Beer, wine & whisky HS 60 30 PDMS
CAR/PDMS
DVB/CAR/PDMS		 250
260
260		 - GC-MS - - [11]
20 aldehydes Green pomace distillates HS 40 55 PDMS/DVB 250 PFBHA GC-MS 0.0007–0.02 76–110 [98]
107 VOC Cider HS 30 50 DVB/CAR/PDMS 250 - GC-MS - - [99]
53 carbonyl compounds Huangjiu (alcoholic beverage) HS 35 45 DVB/CAR/PDMS 250 PFBHA GC-MS/MS - 71–146 [100]
2 α-DCC Soybean paste, red pepper past, soy sauce, wine, beer, distilled liquor HS 20 85 DVB/CAR/PDMS 240 TFEH GC-MS 0.7–1.1 92–104 [101]
LOD, limit of detection; HS, headspace; 4-HNE, 4-hydroxy-2-nonenal; DI, direct immersion; DVB, divinylbenzene; CAR, carboxen®; PDMS, polydimethylsiloxane; DNPH, 2,4-dinitrophenylhydrazine; MDA, malondialdehyde; N-MH, N-methylhydrazine; α-β-UC, α-β-unsaturated carbonyl compound; VOC, volatile organic compounds; SVOC, semi volatile organic compounds; α-DCC, α-dicarbonyl compound, * on fiber derivatization, ** in-solution derivatization.
However, information on the applications of SPME in the determination of volatile compounds from lipids decomposition in foods are limited. Additionally, a notable limitation of the SPME technique is the lack of reproducibility when using different fibers, especially from different batches. Consequently, most comparative studies are carried out with a single fiber to address this limitation.

4. Dispersive Liquid-Liquid Microextraction

DLLME (Figure 4) is a miniaturized LLE technique introduced by Rezaee et al. [102]. Since its introduction in 2006, this technique garnered the interest of analysts and has been widely used for the extraction of various types of analytes from different matrices, such as water, tissues, biological fluids, and food matrices [103][104][105]. The DLLME system consists of a ternary solvent system comprising an aqueous phase containing the analytes of interest, a dispersive solvent that is miscible with both the aqueous phase and the third component of the system, which is the extracting solvent. The mixture formed by the dispersant and the extractant is rapidly injected into the aqueous solution, forming a cloudy solution. This microemulsion is composed of tiny droplets of extractant solvent dispersed in the aqueous phase, thereby increasing the contact surface between them and facilitating quick equilibrium.
Figure 4. Scheme of dispersive liquid-liquid microextraction (DLLME).
DLLME is characterized by its simplicity, speed, efficiency, and capacity for high enrichment due to the high proportion of donor and acceptor phases. Therefore, the most important parameters of DLLME are the selection of extraction conditions and the choice of dispersive solvents for analytes extraction. An appropriate dispersive solvent must be miscible with the extraction phase and the aqueous phase to create fine droplets in the sample matrices, thus enhancing the interaction between the two phases, resulting in high extraction efficiency.
The most commonly used dispersing solvents are acetone, acetonitrile, and short-chain alcohols (such as methanol, ethanol, and propanol) [105]. The extracting solvent must possess higher density than water, high extraction capacity, and good chromatographic behavior. In classical DLLME, chlorinated solvents such as chloroform, carbon tetrachloride, chlorobenzene, or dichloromethane are the most commonly used extractive solvents. However, these solvents are toxic and harmful to the environment. Over recent years, DLLME has evolved, utilizing less toxic extracting solvents, such as ionic liquids (IL) or less dense extractant solvents than the aqueous phase, such as alcohols [104][105][106]. Ionic liquids (IL) exhibit unique properties, including negligible vapor pressure, miscibility with water and organic solvents, good solubility for organic and inorganic compounds, high temperature, stability, and respect for the environment. Additionally, they efficiently absorb and transfer microwave energy and are formed by a central molecule that combines organic cations and several anions [106][107].
Furthermore, DLLME can be coupled in a single step of in situ derivatization and extraction of analytes of interest and even combined with other extraction techniques, such as GDME or ultrasound-assisted extraction (UAE). Table 4 presents a comparison of the methods developed for the analysis of secondary peroxidation products using DLLME.
Table 4. Analytical method for determination of secondary peroxidation products by dispersive liquid-liquid microextraction (DLLME).
Target Compound Sample DLLME Derivative Reagent Determ. LOD
µg/L or µg/Kg		 Rec.
%		 Ref.
Mode Disperser Extracting Solvent T
min		 T
°C
Formaldehyde Beverages MW-IL- ACN IL 3453W 1.5 - DNPH HPLC-UV 0.12 85–95 [108]
Acrylamide Brewed coffee - ACN DCM - - - UPLC-MS/MS 900 97–106 [109]
PCB and acrylamide Milk/Coffee IL [HeOHMIM][Cl] [BMIM][NTf2] - - - HS-GC-ECD-MS - - [110]
MDA, acrolein, 4-HNE Beverages US ACN CH3Cl 5 60 °C DNPH GC-MS 50–200 94–102 [111]
Formaldehyde Milk IL MeOH IL 3453W 0.75 45 °C ACAC UV 100 91–103 [112]
Acrylamide Coffee, chocolate, roasted nuts, French fries, cereals, biscuits, chips, bread, and
caramelized fruit		 SSA SUPRAS-2
(SDS/TBABr/AlCl3)		 2   - UV 0.2 93–96 [113]
Acrylamide Nuts and seeds - PCE EtOH 3 - Xanthydrol GC-MS 0.6 95 [114]
Acrylamide Potato chips UAE PCE EtOH 2 - Xanthydrol GC-MS 0.6 97 [115]
Acrylamide Cereal products - PCE EtOH 1 - Xanthydrol GC-MS 0.6 95 [116]
Acrylamide Bread UAE PCE MeOH 1 - Xanthydrol GC-MS 0.54 98 [117]
4 aldehydes Acrolein & MDA Vegetable oil US ACN CH3Cl 5 60 DPNH GC-MS 50–100 ≥95% 10
LOD, limit of detection; Determ., determination; Rec., recovery; Ref., reference; MW, Microwave; IL, Ionic liquid; IL 3453W, Trihexyltetradecylphosphonium Chloride; DNPH, 2,4-dinitrophenylhydrazine; DCM, Dichloromethane; PCB, polychlorinated biphenyls; MDA, malondialdehyde; US, Ultrasound; UAE, ultrasound-assisted extraction; PCE, tetrachloroethylene, SSA, supramolecular solvent-assisted; ACAC, acetylacetone in an ammonium acetate (2.0% v/v).

5. Combined Microextraction Techniques

Recent advancements in analytical sample preparation reflect a growing trend of integrating diverse extraction techniques to enhance aspects such as separation, cleanup, detection limits, enrichment factors, and the handling of complex sample matrices. The combination of microextraction methods to assess both organic and inorganic targets has proven valuable within the realm of modern analytical chemistry [118]. This approach allows for the concurrent execution of target extraction, pre-concentration, and cleanup stages, effectively shortening the overall procedure time and aligning well with the principles of green analytical chemistry [45][46][47]. This trend underscores a significant progression in analytical sample preparation, harnessing the strengths of various techniques to address intricate analytical challenges and yielding enhanced accuracy, sensitivity, and efficiency in analyzing a wide range of samples [119].
Custodio-Mendoza and colleagues introduced a novel approach involving simultaneous GC-MS analysis of MDA, acrolein (ACRL), formaldehyde, acetaldehyde, propanal, and pentanal, utilizing suspended GDME combined with DLLME [10]. The requirement for analytes to be in a suitable non-polar organic solvent for GC-MS analysis posed limitations on GDME’s application. This challenge became particularly pronounced for carbonyl compounds, especially when derivatized, due to their high volatility, making solvent exchanges intricate.
To address this, Custodio-Mendoza et al. employed a multi-step strategy. They commenced with GDME under optimized conditions: a 10 min extraction at 60 °C using 1 mL of DNPH (0.5 g/L in 2 M HCl) solution as the acceptor phase. The innovation emerged in the subsequent steps. The acceptor phase, containing aldehyde-DNPH derivatives, was transferred to a tube containing 4 mL of ultrapure water to undergo DLLME. A mixture of acetonitrile (0.75 mL) and 70 μL chloroform was injected into the aqueous phase and subjected to sonication at 60 °C for 5 min. This combination of techniques resulted in a cleaner extract with enhanced selectivity and sensitivity. Various solvents including isooctane, hexane, and chloroform were evaluated for optimal extraction.
Remarkably, DLLME facilitated solvent exchange and amplified method sensitivity through enrichment factors, significantly lowering detection limits and enhancing result precision. Another distinctive aspect of their approach was incorporating ultrasonic agitation during the GDME process, which substantially reduced extraction time, optimizing method efficiency and cost-effectiveness. This advancement not only surmounted a significant analytical challenge but also refined sensitivity and analysis speed. The processing and storage of edible oils can lead to oxidation, generating volatile compounds like hydrocarbons, aldehydes, alcohols, and ketones. Thus, quantifying these products serves as potential markers for food quality in the oxidative state. Notably, the method was successfully applied to the quantification of forty-eight samples of vegetable oil, spanning categories such as extra virgin olive oil, refined olive oil, olive-pomace oil, and refined seed oil. The outcomes revealed the presence of acrolein and propanal across all samples, with the highest concentration found in one category. Moreover, malondialdehyde levels seemed to decrease in oils enriched with antioxidants or virgin oils. This comprehensive approach demonstrated the potential for robust lipid peroxidation assessment in various oil types.

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Subjects: Chemistry, Analytical
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Jorge A. Custodio-Mendoza
,
Ana M. Ares-Fuentes
,
Antonia M. Carro
View Times: 221
Entry Collection: Extraction Techniques in Sample Preparation
Revisions: 2 times (View History)
Update Date: 26 Oct 2023
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