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Fulltext Effects of repeated etching cycles using 15% hydrochloric acid on enamel loss and relative attenuation coefficient in resin infiltration

Ibrahim DFA, Hasmun NN, Liew YM, Venkiteswaran A

Photodiagnosis Photodyn Ther, 2024 Feb;45:103989.
PMID: 38280674 DOI: 10.1016/j.pdpdt.2024.103989

BACKGROUND: Resin infiltration is used to mask enamel opacities and the recommended etching cycles are three. However, anecdotal evidence suggests that favorable esthetics outcomes can be obtained by increasing the etching cycles.
AIM: To determine the incremental and total enamel loss when enamel surfaces are exposed to multiple etching cycles and to assess the relative attenuation coefficient after multiple etching cycles and resin infiltration treatment.
METHODS: Ninety extracted sound human premolars teeth were divided into 9 groups (n = 10); with each consecutive group having one additional etching cycle up to 9 cycles. The teeth were scanned with optical coherence tomography and enamel loss and attenuation coefficient were measured with MATLAB software. Enamel loss (one-way ANOVA, p ≤ 0.05) and attenuation coefficient (two-way ANOVA, p ≤ 0.05) were statistically analyzed.
RESULTS: There was a significant total enamel loss of more than 33% found at the 7th etching cycle and more. There was no statistically significant difference in the incremental mean depth of penetration of resin between various etching cycles (F(8, 134) = [2.016], one-way ANOVA, p = 0.185).
CONCLUSION: This study recommends that etching should not be repeated more than seven cycles to prevent excessive enamel loss. Following eight etching cycles, resin infiltration penetration appears approximately equal to that of healthy enamel.

Matched MeSH terms: Hydrochloric Acid*
Fulltext Characterization and functional properties of gelatin extracted from goatskin

Zilhadia, Yahdiana,H., Effionora, A., Irwandi, J.

International Food Research Journal, 2018;25(1):275-281.
MyJurnal

Gelatin from goatskin pretreated with hydrochloric acid and extracted with distilled water at 60oC for 9 hours was characterized and compared to that of bovine skin gelatin (BSG). A yield of 10.26% (wet weight basis) was obtained. Goatskin gelatin (GSG) had high protein (86.58%), suitable moisture (9.58%), low fat (1.46%) and low ash (0.11%) content. The functional properties of GSG including gel strength (301 g bloom) and emulsion activity index (94.27%) were higher than the functional properties of BSG including gel strength (192 g bloom) and emulsion activity index (49.74%). The foaming property of GSG (102%) was lower than that of BSG (164.67%). This study shows that GSG has a high potential for application as a source of commercial gelatin.

Matched MeSH terms: Hydrochloric Acid
Fulltext A solution-based temperature sensor using the organic compound CuTsPc

Abdullah SM, Ahmad Z, Sulaiman K

Sensors (Basel), 2014;14(6):9878-88.
PMID: 24901979 DOI: 10.3390/s140609878

An electrochemical cell using an organic compound, copper (II) phthalocyanine-tetrasulfonic acid tetrasodium salt (CuTsPc,) has been fabricated and investigated as a solution-based temperature sensor. The capacitance and resistance of the ITO/CuTsPc solution/ITO chemical cell has been characterized as a function of temperature in the temperature range of 25-80 °C. A linear response with minimal hysteresis is observed. The fabricated temperature sensor has shown high consistency and sensitive response towards a specific range of temperature values.

Matched MeSH terms: Hydrochloric Acid
Fulltext A visual tutorial on the synthesis of gold nanoparticles

Low A, Bansal V

Biomed Imaging Interv J, 2010 01 01;6(1):e9.
PMID: 21611068 DOI: 10.2349/biij.6.1.e9

Many papers have been written on the synthesis of gold nanoparticles but very few included pictures of the process, and none of them used video to show the whole process of synthesis. This paper records the process of synthesis of gold nanoparticles using video clips. Every process from cleaning of glassware, an important step in the synthesis of metallic nanoparticles, to the dialysis process is shown. It also includes the preparation of aqua regia and the actual synthesis of gold nanoparticles. In some papers, the dialysis process was omitted, but in this paper, it is included to complete the whole process as it is being used for purification.

Matched MeSH terms: Hydrochloric Acid
Fulltext Comparative chemical characteristics of hydrochloric acid- and ammonium oxalate-extracted pectin from roselle (Hibiscus sabdariffa L.) calyces

Nazaruddin, R., Noor Baiti, A.A., Foo, S.C., Tan, Y.N., Ayob, M.K.

International Food Research Journal, 2013;20(1):281-284.
MyJurnal

Recent research suggesting the existence of potential source of pectin from roselle calyces. Pectin was successfully extracted from seven different varieties of roselle calyces. Pectin extraction was conducted using hydrochloric acid (HCl, 0.03 N, pH 1.5) or ammonium oxalate (0.25% w/v, pH 4.6) at 85⁰C for 1 h. Chemical characteristics of the HCl- and ammonium oxalate extracted pectin were compared. Results indicated that ammonium oxalate exhibited greater efficiency in pectin extraction than HCl. Highest pectin yield at 18.7% was obtained by ammonium oxalate extraction of roselle calyx variety Acc.6 compared to only 9.77% by HCl extraction. The lowest pectin yield at 11.3% and 5.78% were observed respectively in ammonium oxalate and HCl extractions of roselle calyx variety UKMR-3. Some important characteristics of ammonium oxalate extracted pectin of roselle Acc.6 were 5.98% moisture, 3.81% ash, 4.64% methoxyl content, 42.24% anhydrouronic acid (AUA) and degree of esterification (DE) 60%. This study suggested that the high DE% roselle pectin is an alternative source of pectin for food industry.

Matched MeSH terms: Hydrochloric Acid
Fulltext Purification of metallurgical grade silicon by acid leaching

Lashgari, V.A., Yoozbashizadeh, H.

ASM Science Journal, 2007;1(1):37-41.
MyJurnal

Silicon, as the most important electronic material, has a lot of applications in the electronic industry and this includes the use of silicon in solar cells. One of the solar grade silicon production processes is the use of acid leaching for the removal of metallic impurities from silicon. The main advantage of this process for silicon purification is that it is based on a low temperature process. The purification of metallurgical grade silicon by acid leaching was studied as a function of time, temperature and etching. Based upon experimental results and under optimum conditions, it was possible to remove 41%, 71% and 25% of iron, calcium and aluminum respectively, with the use of aqua regia.

Matched MeSH terms: Hydrochloric Acid
Process development for the production of protein hydrolysate from cockle (Anadara granosa) meat wash water

Haslaniza H, Maskat M, Wan Aida W, Mamot S

Sains Malaysiana, 2014;43:53-63.

A study was carried out to determine the process parameters and optimization for the hydrolysis of protein precipitate from cockle (Anadara granosa) meat wash water. Precipitation of the protein in the wash water was done using pH manipulation (pH3-8). The precipitate was hydrolyzed using hydrochloric acid (HCl) and optimized for HCl volume, HCl concentration and hydrolysis time using response surface methodology (RSM) based on a central composite rotatable design. Based on the results, hydrolysis of cockle meat wash water precipitate was carried out by precipitation of the wash water at pH4. Optimum condition for the hydrolysis of 2.0 g of cockle meat wash water precipitate was 25 mL of 1 N HCl for 10 h which resulted in nitrogen content (NC) of 0.7% and degree of hydrolysis (DH) of 55%. NC and DH were significantly influenced only by the hydrolysis time.

Matched MeSH terms: Hydrochloric Acid
Fulltext Ime course detachment of biofilms in pipes by hydrochlorination

Shanzay, A., Siddra, T. A., Warda, F., Sheeza, A., Maryam, A., Aina, S. Z., et al.

Asian Journal of Medicine and Biomedicine, 2018;1(1):28-31.
MyJurnal

Bacterial biofilms are a complex community of microbes in which the cells are embedded in a polysaccharide matrix.
This slime is a mean of protection in hostile environments. Biofilms in hospital settings are perilous as they not only
make treatment difficult, cause blockage of pipes but are also cause of serious nosocomial infections thus making their
dispersal an even more important phenomenon. Any foaming method is not applicable at all places for the cleaning of
biofilms hence biofilm dispersal by household sweep containing hydrochloric acid was checked using the microliter
plate assay as dispersal strategy. Bacteria from hospital waste disposal pipes were isolated, its ability to form biofilm
was noted under different time intervals and then finally biofilm degradation was done using different concentrations
of household sweep. It was noted that household sweep can be successfully employed at many places especially waste
disposal pipes and acid resistant tubes. Our results indicated that 20% sweep (HCl conc. 1%) if used for only one
minute can reduce the biofilms to 50%. Similarly increasing contact time can reduce the biofilms further.

Matched MeSH terms: Hydrochloric Acid
Recovering obliterated engraved marks on aluminium surfaces by etching technique

Baharum MI, Kuppuswamy R, Rahman AA

Forensic Sci Int, 2008 May 20;177(2-3):221-7.
PMID: 18313246 DOI: 10.1016/j.forsciint.2008.01.004

A study has been made of the characteristics of restoration of obliterated engraved marks on aluminium surfaces by etching technique. By etching different reagents on 0.61mm thick sheets of aluminium (99wt%) on which some engraved marks had been erased to different depths it was found that the reagent 60% hydrochloric acid and 40% sodium hydroxide on alternate swabbing on the surfaces was found to be the most sensitive one for these metal surfaces. This reagent was able to restore marks in the above plates erased down to 0.04mm below the bottom of the engraving. The marks also presented excellent contrast with the background. This reagent was further experimented with similar aluminium surfaces, but of relatively greater thickness of 1.5mm. It was noticed that the recovery depth increased slightly to 0.06mm; this suggested the dependence of recovery depth on the thickness of the sheet metal. Further, the depth of restoration decreased in cases where the original number was erased and over which a new number was engraved; the latter results are similar to those of steel surfaces reported earlier [M.A.M. Zaili, R. Kuppuswamy, H. Harun, Restoration of engraved marks on steel surfaces by etching technique, Forensic Sci. Int. 171 (2007) 27-32].

Matched MeSH terms: Hydrochloric Acid
A sensitive, selective and rapid determination of lead(II) ions in real-life samples using an electrochemically reduced graphene oxide-graphite reinforced carbon electrode

Hamsawahini K, Sathishkumar P, Ahamad R, Yusoff AR

Talanta, 2015 Nov 1;144:969-76.
PMID: 26452915 DOI: 10.1016/j.talanta.2015.07.049

In this study, a sensitive and cost-effective electrochemically reduced graphene oxide (ErGO) on graphite reinforced carbon (GRC) was developed for the detection of lead (Pb(II)) ions present in the real-life samples. A film of graphene oxide (GO) was drop-casted on GRC and their electrochemical properties were investigated using cyclic voltammetry (CV), amperometry and square wave voltammetry (SWV). Factors influencing the detection of Pb(II) ions, such as grades of GRC, constant applied cathodic potential (CACP), concentration of hydrochloric acid and drop-casting drying time were optimised. GO is irreversibly reduced in the range of -0.7 V to -1.6 V vs Ag/AgCl (3 M) in acidic condition. The results showed that the reduction behaviour of GO contributed to the high sensitivity of Pb(II) ions detection even at nanomolar level. The ErGO-GRC showed the detection limit of 0.5 nM and linear range of 3-15 nM in HCl (1 M). The developed electrode has potential to be a good candidate for the determination of Pb(II) ions in different aqueous system. The proposed method gives a good recovery rate of Pb(II) ions in real-life water samples such as tap water and river water.

Matched MeSH terms: Hydrochloric Acid
Insights into the equilibrium, kinetic and thermodynamics of nickel removal by environmental friendly Lansium domesticum peel biosorbent

Lam YF, Lee LY, Chua SJ, Lim SS, Gan S

Ecotoxicol Environ Saf, 2016 May;127:61-70.
PMID: 26802563 DOI: 10.1016/j.ecoenv.2016.01.003

Lansium domesticum peel (LDP), a waste material generated from the fruit consumption, was evaluated as a biosorbent for nickel removal from aqueous media. The effects of dosage, contact time, initial pH, initial concentration and temperature on the biosorption process were investigated in batch experiments. Equilibrium data were fitted by the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models using nonlinear regression method with the best-fit model evaluated based on coefficient of determination (R(2)) and Chi-square (χ(2)). The best-fit isotherm was found to be the Langmuir model exhibiting R(2) very close to unity (0.997-0.999), smallest χ(2) (0.0138-0.0562) and largest biosorption capacity (10.1mg/g) at 30°C. Kinetic studies showed that the initial nickel removal was rapid with the equilibrium state established within 30min. Pseudo-second-order model was the best-fit kinetic model indicating the chemisorption nature of the biosorption process. Further data analysis by the intraparticle diffusion model revealed the involvement of several rate-controlling steps such as boundary layer and intraparticle diffusion. Thermodynamically, the process was exothermic, spontaneous and feasible. Regeneration studies indicated that LDP biosorbent could be regenerated using hydrochloric acid solution with up to 85% efficiency. The present investigation proved that LDP having no economic value can be used as an alternative eco-friendly biosorbent for remediation of nickel contaminated water.

Matched MeSH terms: Hydrochloric Acid
Fulltext Synthesis, characterizations and anti-corrosion screening of Sadimine and Brosadamine

Siti Noriah Mohd Shotor, Nur Anis Atirah Zulkiflee

Journal of Academia Universiti Teknologi MARA Negeri Sembilan, 2020;8(2):1-8.
MyJurnal

This paper deals with a review of the inhibition activity of a Schiff bases on the deterioration of mild steel in hydrochloric acid media. Two Schiff base ligands namely N,N’- Bis(salicylidene) ethylenediamine (Sadimine) and N,N’-Bis(bromosalicylidene)- ethylenediamine (Brosadimine) were synthesized from the condensation reactions of salicylaldehyde or 5-bromosalicylaldehyde with ethylenediamine respectively and evaluated as corrosion inhibitor for mild steel in 1 M HCl solution using weight loss method. The use of inhibitors is one of the most practical methods for protection of mild steel against corrosion in acidic media. Schiff bases are widely being employed in such applications. This paper highlights the influence of structure–inhibition activity relationship of Schiff base compounds
on their performance as corrosion inhibitors of mild steel in acid media. Sadimine and
Brosadimine show appreciable corrosion inhibition efficiency against the corrosion of mild
steel in 1 M HCl solution at room temperature. It has been found that Brosadimine shows
greater corrosion inhibition efficiency than Sadimine due to extra halogen group presence in
the structure. As the concentration of studied inhibitors increases, the corrosion inhibition
efficiency of the prepared compounds also increases. This study demonstrated that corrosion
inhibitors for metals and alloys can preserve the quality and life of metals from corrosion.

Matched MeSH terms: Hydrochloric Acid
Voltammetric determination of iodide in iodized table salt using cetyltrimethylammonium bromide as ion-pairing

Jamilan MA, Abdullah J, Alang Ahmad SA, Md Noh MF

J Food Sci Technol, 2019 Aug;56(8):3846-3853.
PMID: 31413410 DOI: 10.1007/s13197-019-03855-x

In this work, voltammetric study based on cetyltrimethylammonium bromide (CTAB) as an ion-pairing agent for the determination of iodine level in iodized table salt has been explored. CTAB was used as an intermediate compound between iodide (I-) and the electrode due to its ability to dissociate to produce cetyltrimethylammonium ions ([CTA]+). The [CTA]+ with a long hydrophobic alkyl chain can be directly adsorbed onto the surface of the working electrode, and this in turns coated the electrode with cationic charge and enhance the electrode ability to bind to iodide (I-) and other molecular iodine ions. A mixture of iodide and CTAB ([CTA]+I-) was prepared and potential of 1.0 V for 60.0 s was applied to pre-concentrate the solution on the working electrode causing the [CTA]+I- to oxidize to iodine (I2). The produced I2 immediately react with chloride ion (Cl-) from the electrolyte of hydrochloric acid (HCl) to produce I2Cl- and form ion-pair with CTA+ as [CTA]+I2Cl-. The linear calibration curve of the developed method towards iodide was in the concentration range of 0.5-4.0 mg/L with sensitivity of - 1.383 µA mg/L-1 cm-2 (R2 = 0.9950), limit of detection (LOD) of 0.3 mg/L and limit of quantification (LOQ) of 1.0 mg/L, respectively. The proposed method indicates good agreement with the standard method for iodine determination with recovery range from 95.0 to 104.3%. The developed method provided potential application as a portable on-site iodine detector.

Matched MeSH terms: Hydrochloric Acid
Fulltext Improved optimum condition for recovery and measurement of 210Po in environmental samples

Zal U’yun Wan Mahmood, Norfaizal Mohamed @ Mohamad, Nik Azlin Nik Ariffin, Abdul Kadir Ishak

Jurnal Sains Nuklear Malaysia, 2013;25(2):40-49.
MyJurnal

An improved laboratory technique for measurement of polonium-210(
210Po) in environmental
samples has been developed in Radiochemistry and Environmental Laboratory (RAS), Malaysian
Nuclear Agency. To further improve this technique, a study with the objectives to determine the
optimum conditions for
210Po deposition and; evaluate the accuracy and precision results for
the determination of 2 1 0 P o in environmental samples was carried-out. Polonium-210 which
is an alpha emitter obtained in acidic solution through total digestion and dissolution of samples
has been efficiently plated onto one side of the silver disc in the spontaneous plating process for
measurement of its alpha activity. The optimum conditions for deposition of 210Po were achieved
using hydrochloric acid (HCl) media at acidity of 0.5 M with the presence of 1.0 gram hydroxyl
ammonium chloride and the plating temperature at 90
oC. The plating was carried out in 80 mL
HCl solution (0.5 M) for 4 hours. The recorded recoveries obtained using 2 0 9 P o tracers in
the CRM IAEA-385 and environmental samples were 85% – 98% whereby the efficiency of the
new technique is a distinct advantage over the existing techniques. Therefore, optimization of
deposition parameters is a prime importance to achieve accuracy and precision results as well as
economy and time saving

Matched MeSH terms: Hydrochloric Acid
Fulltext Preparation and evaluation of water-in-soybean oil-in-water emulsions by repeated premix membrane emulsification method using cellulose acetate membrane

Muhamad II, Quin CH, Selvakumaran S

J Food Sci Technol, 2016 Apr;53(4):1845-55.
PMID: 27413211 DOI: 10.1007/s13197-015-2107-6

The purpose of this study was to investigate the preparation of formulated water- in-soybean oil-in-water emulsions by repeated premix membrane emulsification method using a cellulose acetate membrane. The effect of selective membrane emulsification process parameters (concentration of the emulsifiers, number of passes of the emulsions through the membrane and storage temperature) on the properties and stability of the developed emulsions were also investigated. 1, 3, 6, 8-pyrenetetrasulfonic acid tetrasodium salt (PTSA) was used as a hydrophilic model ingredient for the encapsulation of bioactive substances. W/O emulsions with 7 wt% (weight percentage) PGPR displays homogeneous and very fine dispersions, with the median diameter at 0.640 μm. Meanwhile, emulsions prepared by membrane emulsification (fine W/O/W) showed the highest stability at Tween 80 concentrations of 0.5 wt.% (weight percentage). It concluded that at 7 wt.% (weight percentage) PGPR concentration and 0.5 wt.% (weight percentage) Tween 80 concentrations, the most uniform particles with minimum mean size of oil drops (9.926 μm) were obtained after four passes through the membrane. Thus, cellulose acetate membrane can be used for preparing a stable W/O/W emulsions by repeated premix ME due to low cost and relatively easy to handle.

Matched MeSH terms: Hydrochloric Acid
Fulltext Corrosion behaviour of Al-Si cast alloy reinforced with titanium diboride (TiB2) and scandium (Sc)

Ibrahim, R.E., Talari, M.K., Sabrina, M. Yahaya, Rosmamuhamadani, R., Sulaiman, S., Ismail, M.I.S.

Journal of Engineering and Science Research, 2018;2(2):1-8.
MyJurnal

The aluminium-silicon (Al-Si) based on Metal Matrix Composites (MMCs) is widely used in lightweight
constructions and transport applications requiring a combination of high strength and ductility. A grain
refinement plays a crucial role in improving characteristics and properties of Al alloys. In this investigation,
titanium diboride (TiB2) and scandium (Sc) inoculants were added to the Al-Si alloys for grain refinement of
an alloy. In this investigation, the corrosion resistance rate of Al-Si cast alloy reinforced by TiB2 and Sc were
measured by potentiostat (AUTOLAB) instrument. The aim of this research is to investigate the corrosion
rate for Al-Si-TiB2-Sc composites that immersed in different concentration of acidic solutions. Besides, the
immersion time of acidic solutions also was investigated. All the samples were prepared accordingly for
ASTM standard by the composition of 6.0 wt% TiB2 and 0.6wt% Sc. All the samples undergo cold mounting
technique for easy handling on corrosion tests. Then the samples were immersed in two different
concentrations acidic medium solutions, which were 0.1.and 1.0 M hydrochloric acids (HCl). The corrosion
rate also was investigated for immersion samples of 1.0 M HCl for 21 days. From the results obtained, added
TiB2 and Sc onto Al-Si alloy gave the better properties in corrosion resistance. Corrosion rates to reduce when
the samples were immersed in a lower concentration of acidic medium, 0.1 HCl. However, there are some
significant on the result but it still following the corrosion rates trend. Thus, improvements to reinforcement
content need to be done in further research to cover the lack of this corrosion rates trend.

Matched MeSH terms: Hydrochloric Acid
Influence of hydrochloric acid volume on the growth of titanium dioxide (TiO2) nanostructures by hydrothermal method

Noor Kamalia Abd Hamed, Noor Sakinah Khalid, Fatin Izyani Mohd Fazli, Muhammad Luqman Mohd Napi, Nafarizal Nayan, Mohd Khairul Ahmad

Sains Malaysiana, 2016;45:1669-1673.

Titanium dioxide (TiO2
) with various morphologies has been successfully synthesized by a simple hydrothermal method
at 150o
C for 10 h using titanium butoxide (TBOT) as a precursor, deionized (DI) water and hydrochloric acid (HCl) on
a fluorine-doped tin oxide (FTO) substrate. The influences of HCl volume on structural and morphological properties
of TiO2
have been studied using x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM),
respectively. The result showed that several morphologies such as microsphere, microrods, nanorods and nanoflowers
were obtained by varying the volume of hydrochloric acid. The crystallinity of titanium dioxide enhanced with the
increasing of hydrochloric acid volume.

Matched MeSH terms: Hydrochloric Acid
Localization of burn mark under an abnormal topography on MOSFET chip surface using liquid crystal and emission microscopy tools

Lau CK, Sim KS, Tso CP

Scanning, 2011 Jan-Feb;33(1):13-20.
PMID: 21462221 DOI: 10.1002/sca.20216

This article focuses on the localization of burn mark in MOSFET and the scanning electron microscope (SEM) inspection on the defect location. When a suspect abnormal topography is shown on the die surface, further methods to pin-point the defect location is necessary. Fault localization analysis becomes important because an abnormal spot on the chip surface may and may not have a defect underneath it. The chip surface topography can change due to the catastrophic damage occurred at layers under the chip surface, but it could also be due to inconsistency during metal deposition in the wafer fabrication process. Two localization techniques, liquid crystal thermography and emission microscopy, were performed to confirm that the abnormal topography spot is the actual defect location. The tiny burn mark was surfaced by performing a surface decoration at the defect location using hot hydrochloric acid. SEM imaging, which has the high magnification and three-dimensional capabilities, was used to capture the images of the burn mark.

Matched MeSH terms: Hydrochloric Acid
Ultrasound mediated acid hydrolysis of konjac glucomannan

Cheng, L.H., Nur Halawiah, H., Lai, B.N, Yong, H.M., Ang, S.L.

International Food Research Journal, 2010;17(4):1043-1050.
MyJurnal

Konjac glucomannan (KGM) was treated with or without sonication and/or hydrochloric acid (HCl).
Hydrolysis effects on KGM were studied for properties such as degree of hydrolysis, fluidity, molecular mass, and creep properties. The degree of hydrolysis for sonicated KGM and acid treated KGM were not significantly different. However, the combination treatment of acid hydrolysis and sonication was found effective in yielding a smaller molecular weight fraction of KGM and solution with higher fluidity. From the creep analysis, KGM treated with combination treatment exhibited the highest compliance among samples tested. In general, ultrasound mediated acid hydrolysis was found to be a promising technique in degrading high molecular weight biopolymer. This could be attributed to a localized high temperature and high shear forces generated during cavitation that facilitated the endothermic acid hydrolysis.

Matched MeSH terms: Hydrochloric Acid
Enhanced fermentable sugar production from kitchen waste using various pretreatments

Hafid HS, Rahman NA, Md Shah UK, Baharudin AS

J Environ Manage, 2015 Jun 1;156:290-8.
PMID: 25900092 DOI: 10.1016/j.jenvman.2015.03.045

The kitchen waste fraction in municipal solid waste contains high organic matter particularly carbohydrate that can contribute to fermentable sugar production for subsequent conversion to bioethanol. This study was carried out to evaluate the influence of single and combination pretreatments of kitchen waste by liquid hot water, mild acid pretreatment of hydrochloric acid (HCl) and sulphuric acid (H2SO4) and enzymatic hydrolysis (glucoamylase). The maximum total fermentable sugar produced after combination pretreatment by 1.5% HCl and glucoamylase consisted of 93.25 g/L glucose, 0.542 g/L sucrose, 0.348 g/L maltose, and 0.321 g/L fructose. The glucose released by the combination pretreatment method was 0.79 g glucose/g KW equivalent to 79% of glucose conversion. The effects of the pre-treatment on kitchen waste indicated that the highest solubilization was 40% by the combination method of 1.5% HCl and glucoamylase. The best combination pre-treatment gave concentrations of lactic acid, acetic acid, and propionic acid of 11.74 g/L, 6.77 g/L, and 1.02 g/L, respectively. The decrease of aliphatic absorbance bands of polysaccharides at 2851 and 2923 cm(-1) and the increase on structures of carbonyl absorbance bands at 1600 cm(-1) reflects the progress of the kitchen waste hydrolysis to fermentable sugars. Overall, 1.5% HCl and glucoamylase treatment was the most profitable process as the minimum selling price of glucose was USD 0.101/g kitchen waste. Therefore, the combination pretreatment method was proposed to enhance the production of fermentable sugar, particularly glucose from kitchen waste as the feedstock for bioethanol production.

Matched MeSH terms: Hydrochloric Acid/chemistry

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