Aldehyde Fuchsin Research Articles

N-acetylcysteine combined with insulin therapy can reduce myocardial injury induced by type 1 diabetes through the endoplasmic reticulum pathway

With the development of Type 1 diabetes mellitus (T1DM), various complications can be caused. Hyperglycemia affects the microenvironment of cardiomyocytes, changes endoplasmic reticulum homeostasis, triggers unfolding protein response and eventually promotes myocardial apoptosis. However, insulin therapy alone cannot effectively combat the complications caused by T1DM. Forty adult beagles were randomly divided into five groups: control group, diabetes mellitus group, insulin group, insulin combined with NAC group, and NAC group. 24-hour blood glucose, 120-day blood glucose, 120-day body weight, and serum FMN content were observed, furthermore, hematoxylin-eosin staining, Periodic acid Schiff reagent staining, and Sirius red staining of the myocardium were evaluated. The protein expressions of GRP78, ATF6, IRE1, PERK, JNK, CHOP, caspase 3, Bcl2, and Bax were detected. Results of the pathological section of myocardial tissue indicated that insulin combined with NAC therapy could improve myocardial pathological injury and glycogen deposition. Additionally, insulin combined with NAC therapy down-regulates the expression of GRP78, ATF6, IRE1, PERK, JNK, CHOP, caspase3, and Bax. These findings suggest that NAC has a phylactic effect on myocardial injury in beagles with T1DM, and the mechanism may be related to the improvement of endoplasmic reticulum stress-induced apoptosis.

Web-Based Formaldehyde Detection System in Chickens using IOT and Fuzzy Logic

Chicken is a widely consumed source of animal protein globally, valued for its high protein content and essential nutrients. Ensuring the freshness of chicken meat is crucial to guarantee its healthiness and prevent harm to consumers. Unfortunately, there are concerns about the use of hazardous substances like formaldehyde by some traders for meat preservation. Formalin, a clear liquid with a pungent odor, is commonly utilized as a food preservative. To address the misuse of formaldehyde in broiler chickens, an innovative solution is proposed involving IoT technology and Fuzzy Logic. The developed formaldehyde detection system employs an ESP8266 microcontroller and a TCS3200 sensor to assess color variations in chicken meat samples mixed with Schiff's reagent. The TCS3200 sensor detects color changes, and the ESP8266 Microcontroller converts measurements into RGB basic colors. Calibration of the sensor yielded a 98.30% relative accuracy at a 3 cm distance. Fuzzy Logic is then applied to determine formaldehyde levels, displayed on an LCD screen. The tool exhibits a 95% reliability for achieving a 0 ppm level, 93% for 40 ppm, 92% for 80 ppm, and 100% for 200 ppm

Exogenously applied putrescine regulates aluminium [al (III)] stress in maize (Zea mays L.): Physiological and metabolic implications

In this study, we investigated the role of exogenous application of putrescine (Put) for alleviation of Al (III) stress responses in maize seedlings. In presence of Put, the growth and biomass improved substantially in Al (III) stressed seedlings as compared to Al (III) alone. The production of hydrogen peroxide (H2O2) and superoxide radical (O2•-) were significantly restrained in during Al (III) stress in Put supplemented seedlings. The malondialdehyde (MDA) production was significantly controlled during Al (III) stress by Put supplementation as compared to the seedlings under Al (III) stress alone. The histochemical analysis showed variation in staining intensities of diaminobenzidine (DAB) and nitoroblue tetrazolium (NBT) salt to detect the presence of H2O2 and O2•- respectively, reflected strong role of Put in regulation of reactive oxygen species (ROS) production. The staining of roots with Schiff's reagent and Evans blue dye to detect lipid peroxidation and loss of plasma membrane integrity showed that Put controls the lipid peroxidation and maintains the integrity of the plasma membrane during Al (III) stress. The proton (1H) nuclear magnetic resonance (NMR) analysis of methanolic extracts of root and shoot of maize seedlings under Al (III) stress in presence or absence of Put showed considerable disparity in terms of metabolic profiles, which include amino acids, sugars, carbohydrates, organic acids and several aliphatic and aromatic compounds. The present study exhibited the potential role of Put for mitigation of Al (III) stress by enhancing growth, regulating ROS production, reducing oxidative stress, improving antioxidant metabolism and maintaining the metabolic pool.

Macroscopic, microscopic, and immunofluorescent characterization of the Greek tortoise (Testudo graeca graeca) oropharyngeal floor with concern to its feed adaptation as a herbivorous land reptile.

The current investigation focuses on gross anatomy, light, and scanning electron microscopy (SEM) of the Testudo graeca oropharyngeal floor, with particular reference to the immunofluorescence technique to examine its tongue. The T. graeca oropharyngeal floor showed many anatomical structures: the lower rhamphotheca, paralingual ridge, lower alveolar ridge, tongue, laryngeal mound, and glottis. The lower rhamphotheca appeared as a V-shaped jaw line with a highly serrated edge and a median tomium (beak). SEM observations of the lingual apex and the lingual body showed rectangular and conical filiform papillae with porous surfaces and taste pores. Meanwhile, the lingual root had two wings that carried papillae with different shapes: dagger-shaped, conical, bifurcated, and leaf-like papillae, and these papillae lacked taste pores. The laryngeal mound had openings for the laryngeal mucus gland and its secretions. Light microscopy findings showed mucous glands in the propria submucosa and near the mucosal surface of the lingual apex. The lingual root had lingual papillae and two hyaline cartilaginous skeletons between skeletal muscles, and the lingual papillae were elongated filiform, rectangular filiform papillae, and fungiform papillae. The lamina propria constituted the core of the lingual papillae and the mucous gland, they had a positive reaction with the periodic acid schiff (PAS) reagent. The apical surface of the fungiform papillae had taste pores. Under immunofluorescence, the vimentin was detected in taste bud cells, and synaptophysin reacted to the taste buds and nerve bundles. The current study of the Greek tortoise oropharyngeal floor investigated its herbivorous eating habits using its serrated lower rhamphotheca, a large tongue with differently shaped papillae, and numerous mucous glands. RESEARCH HIGHLIGHTS: The Greek tortoise (T. graeca graeca) oropharyngeal floor showed many anatomical structures: lower rhamphotheca, paralingual ridge, lower alveolar ridge, tongue, laryngeal mound, and glottis. SEM and light microscopy observations of the tongue revealed varied types and shapes of lingual papillae with a porous surface on the tongue apex (rectangular or conical filiform papillae), on the tongue body (filiform and fungiform papillae), and on the tongue root (dagger-shaped, conical, bifurcated, and leaf-like papillae). Light microscopy findings: the lamina propria constituted the core of the lingual papillae and had numerous mucous glands that had a slightly magenta-red color with PAS reagent. The apical surface of the fungiform papillae had taste pores. Vimentin and synaptophysin gave a reaction to the taste buds.

An enrichment system for glycoproteins using microfluidic paper-based analytical device with colorimetric detection

We introduce a facile method for glycoprotein enrichment, separation, and detection using microfluidic paper-based analytical devices (μPADs). The μPADs comprise two distinct components: the enrichment region (Chip I) and the detection section (Chip II). The reusable Chip I is fabricated by immobilizing 3-aminophenylboronic acid (APBA) onto a circular paper substrate, demonstrating exceptional glycoprotein affinity. In disposable Chip II, glycoproteins react with periodic acid, generating carbonyl compounds that produce a purple-colored product upon reacting with the Schiff reagent. Alterations in color intensity are captured using an ordinary cell phone and are subsequently analyzed using Photoshop software. Observations note a linear increase in average color intensities from 1.0 × 10−3 to 5.0 × 10−3 mol/L, with an R2 value of 0.9927. The relative standard deviations (RSDs) of inter-day (n = 5) and intra-day (n = 5) assessments stand at 1.5 % and 1.4 %, respectively. Our proposed approach can effectively enrich an ovalbumin (OVA) solution with concentrations as low as 1.0 × 10−11 mol/L, resulting in enrichment rates of 107 to 108 times. The interference deviations of five substances relative to OVA lie within the range of − 2.0 % to + 2.0 %. The methodology successfully enriches glycoproteins from egg white samples diluted by a factor of 1 × 106, demonstrating that the proposed method is remarkably suitable for enriching glycoproteins from authentic samples.

Identification of Formalin in Raw Tofu from Sidenreng Rappang District Traditional Markets

Formalin (Formaldehyde) is a chemical compound whose use is prohibited as a preservative in food additives. This study aims to analyze the content of formalin (Formaldehyde) in raw tofu circulating in Sidenreng Rappang district. The test method used was by qualitative analysis using Schiff reagent and KMnO4. The quantitative analysis using the UV-Vis spectrophotometry method. The test results used Schiff reagent and KMnO4, the four tofu samples contained formalin. Test results on the UV-Vis Spectrophotometry method at a wavelength of 555 nm, obtained formalin levels in sample with sample code A = 1.130%, sample code B = 1.826%, sample code C = 1.84%. It can be concluded that in the formaldehyde qualitative analysis test on raw tofu, the three samples positively contained formaldehyde. As well as the results of the measurement of the three positive samples containing formaldehyde using a UV-Vis spectrophotometer.

Gambaran Residu Paparan Formalin pada Sampel Plasma Darah Karyawan Instalasi Hemodialisis Rumah Sakit

Hemodialysis is one of the installations in the hospital that handles blood washing therapy, by removing excess waste or harmful compounds, through a semi-permeable membrane which is carried out to replace kidney function that is no longer functioning properly. Hemodialysis is given to patients with a diagnosis of acute renal failure, terminal renal failure and patients who have severe poisoning with certain drugs. The research design was carried out descriptively. The aim of this research was to determine whether there was formalin exposure to hemodialysis workers or nurses when reusing or cleaning hemodialysis equipment, using a qualitative test. In this research, the results were obtained from 15 blood plasma samples, namely 6 positive formalin blood samples, with Schiff, Tollens, KMnO4 and Fehling reagents. It is known from the table of analysis results of qualitative test of formalin exposure on hemodialysis workers in one of the East Java Hospitals. For further research, it is hoped that quantitative tests will be carried out in determining the level of formalin in the blood using the instrument.

Clinical and morphological characteristics of lung sequestration

To study the clinical and morphological manifestations of lung sequestration. Surgical material (lung tissue) of 18 patients (2017-2021) and 8 archival observations (1972-1994) of confirmed lung sequestration were examined. Histological staining (hematoxylin and eosin, Schiff reagent, Ziehl-Neelsen, picrofuchsin according to Van Gieson) and immunohistochemical reactions with antibodies to SMA, TTF1, CK5/6 (DAKO) were performed. The ratio of men to women was 5:4; the average age of the patients was 35 years. Lung sequestration is localized mainly in the lower lobe segments, the left lung is involved in the pathological process more often. The cystic variant of lung sequestration with a chronic inflammatory process prevailed. Histological examination revealed the similarity of lung sequestration with congenital adenomatous lung malformation type 2 and rhabdomyomatous dysplasia. The respiratory and bronchial epithelium lost differentiation in the sequestered area. The morphological picture of lung sequestration is nonspecific and can manifest itself in various types of inflammatory reactions and remodeling of lung tissue.

Histomorphology of the Beta-Cells and Phytochemical Evaluation of Ethanolic Leaf Extract of Africa Star Apple - Chrysophyllum albidum (Sapotaceae)

Objective: Studies have recognized the numerous health benefits of Chrysophyllum albidum. This study examine the phytochemical evaluation of ethanolic leaf extract of C. albidum and its histological effects on the beta-cells of streptozotocin-induced diabetic rats.
 Method: Forty-two Sprague-Dawley rats (170- 200 g) were divided into six (n=7) groups. Groups 1 and 2 were given 10 mL of normal saline; group 3 was given 2 mg/kg of glibenclamide; and groups 4, 5, and 6 were given 125, 250, and 500 mg/kg/ day of C. albidum ethanolic leaf extract, respectively. Except for group 1, animals in groups 2-6 were injected intraperitoneally with 50 mg/kg streptozotocin after 14 days of oral treatment with normal saline, glibenclamide, and extract. For the next 14 days, rats were given normal saline, glibenclamide, and extract. The rats were fasted overnight before sacrifice on day 14; the pancreas was removed under diethyl ether anaesthesia and prepared for histological examination using a modified aldehyde fuchsin staining technique. Standard procedures were used for phytochemical evaluation and proximate analysis.
 Results: It was observed histological that the pancreatic tissues revealed cellular regeneration of the damage beta cells at a doses of 250 and 500 mg/kg/day. Phytochemical screening revealed the following; anthocyanin, cardiac glycosides, alkaloids, flavonoids, phenols, terpenoids, reducing sugar, and tannins while proximate analysis confirmed that the leaf contained 4.83% moisture, 39.59% crude fibre, 3.35% ash, 2.35% crude fats, 3.21% crude proteins and 46.71% carbohydrate.
 Conclusion: The results shows that C. albidum may possess a strong pharmacological activity owing to its rich phyto- constituents. This may have mediated its antidiabetic action by pancreatic beta cells regeneration. Hence, C. albidum could be a potential drug precursor for management of diabetes.
 Bangladesh Journal of Medical Science Vol. 23 No. 01 January’24 Page : 63-73

Optimization of PAS stain and similar Schiff's based methods for glycogen demonstration in liver tissue.

Demonstration of glycogen in tissue holds considerable diagnostic relevance across various pathological conditions, particularly in certain tumors. The histochemical staining of glycogen using methods utilizing Schiff's reagents is subject to influences arising from the type of fixative, fixation temperature, and oxidizing agents employed. This study aimed to assess diverse fixatives, fixation temperatures, and oxidizing agents, each with variable treatment durations, in conjunction with Schiff's reagent for optimal glycogen demonstration. Paraffin blocks derived from a rabbit's liver served as the experimental substrate, encompassing 340 paraffin sections subjected to different procedures. For tissues fixed at 4°C, good staining outcomes, as determined by the periodic acid-Schiff (PAS) stain, were observed with 10% neutral buffered formalin (NBF), 80% alcohol, and Bouin's solution. Tissues fixed at room temperature (RT) demonstrated good PAS staining results with both 10% NBF and 80% alcohol. Notably, other oxidizing agents exhibited poor outcomes across all fixatives and fixation temperature, with two exceptions, as satisfactory staining results were obtained when using 5% chromic acid. Consequently, Both 10% NBF and 80% emerge as preferred fixatives of choice for glycogen demonstration when coupled with PAS stain. It is noteworthy that Bouin's solution could also provide good outcomes when fixation occurred at 4°C.

Histological changes in the liver of rats under the influence of Vipera berus berus venom

Animal venoms contain a whole complex of compounds, among which there are peptides, proteins, as well as other organic molecules and salts. Their toxins are able to cause pronounced disturbances in the functioning of physiological systems, leading to the appearance of pathological conditions, complications, or even death. The aim of the research is to study the histological changes in the liver of rats under the influence of Vipera berus berus venom. Experimental studies were carried out on white non-linear male rats. The animals were conditionally divided into two groups – a control and an experimental group of 10 individuals in each. Experimental rats were injected intraperitoneally with a semi-lethal dose (LD50) (1.576 mg/g-1) of Vipera berus berus venom in saline solution. Animals of the control group were injected intraperitoneally with only saline solution. Rats were removed from the experiment 24 hours after exposure to the venom, anesthetized by cervical dislocation. Liver samples of animals of all groups were taken for microscopic examination. Histological preparations of the liver were stained with hematoxylin and eosin. Histological preparations were studied using a SEO SСAN light microscope. To identify the key enzyme of the citric acid cycle – succinate dehydrogenase, histochemical studies were performed according to the Nakhlas method. To study the features of glycogen accumulation in hepatocytes, sections were stained using Schiff's reagent, after pretreatment with iodic acid (PAS reaction) in Shabadash's modification. An immunohistochemical research method was used to detect a subpopulation of CD86+ cells in the liver of experimental animals. Under the influence of Vipera berus berus venom, the development of alterative changes in the liver parenchyma and vascular disorders were microscopically revealed. The appearance of foci of leukocyte infiltration was established, which indicates the development of inflammatory processes. A histochemical study of the content of succinate dehydrogenase in the liver of animals injected with Vipera berus berus venom showed uneven activity of the mitochondrial enzyme in the lobules. A histochemical study of glycogen in hepatocytes of the liver of rats exposed to Vipera berus berus venom showed a decrease in the content of trophic inclusions. An increase in the population of CD86+ cells indicates reactive inflammatory processes observed in the body as a result of the action of components of Vipera berus berus venom.

Characterization of the Small Intestine in the Southern White-breasted Hedgehog (Erinaceus concolor) Using Histological, Histochemical, Immunohistochemical, and Scanning Electron Microscopic Techniques.

The present study was designed to investigate the microscopic features of the small intestine in the southern white-breasted hedgehog (Erinaceus concolor). The histochemical profile of the small intestine was investigated using periodic acid Schiff (PAS), alcian blue (AB, pH 2.5), and aldehyde fuchsin. The expression of SOX9 was also evaluated immunohistochemically, and the detailed morphology of intestinal mucosa was studied by using a scanning electron microscope. The intestinal wall was composed of the tunica mucosa, tunica submucosa, tunica muscularis, and tunica serosa. Plica circulares and muscularis mucosa were present only in the duodenum. The jejunal villi were the tallest and the ileal villi were the shortest. From the duodenum to the ileum, the population density of goblet cells decreased significantly. The goblet cells throughout the small intestine reacted positively with PAS and AB. The expression rate of SOX9 was not statistically different between the three parts of the small intestine (p > 0.05). In conclusion, despite the general characteristics of the small intestine in this species of hedgehog, there were some differences when compared with other mammalian and rodent species. These findings provide a baseline for future detailed research on the digestive system of the hedgehog species and other mammalian species.

Histomorphological and histochemical Study of the jejunum in moorhen (Gallinula chloropus) in Iraq

The goal of the current investigation was to gather information on the histology and histochemical composition of the jejunum in moorhens (Gallinula chloropus). In order to conduct the current investigation, six moorhens were gathered. They were purchased from regional vendors in particular markets in Baghdad, Iraq. To collect the intestine, birds were put down after being dissected, and the specimens were then fixed in 10% neutral buffered formalin. The blocks were sectioned at 6 m thickness and stained with Mayer's hematoxylin and eosin, Masson trichrome stain, periodic acid Schiff reagent (PAS), and Alcian blue stain (AB)PH-2.5 ,after being thoroughly fixed. The specimens were then cleared in xylene and embedded in paraffin wax. According to the Gross findings, the small intestine is made up of the duodenum, the jejunum, and the ileum. Histologically, the mucous membrane was thrown into large numerous villi in the jejunum, showing blunt apical part and wide basal part with thin layer of muscularis mucosa. The submucosa was thin layer of connective tissue. Below the submucosa was thick layer arranged in a thick circular and thin longitudinal. According to histochemical results, the PAS stain had a negative reaction on columnar cells while having a positive reaction on goblet cells. When the AB (pH 2.5) was applied, the wall displayed epithelial cells that stained negatively while the goblet cells responded favorably to their acidic mucopolysaccharides.

Ovarian changes and development of the branchial placenta occurring in Jenynsia lineata (Cyprinodontiformes, Anablepidae).

In viviparous teleosts, intraovarian gestation occurs intrafollicularly, as in poeciliids, or intraluminally, as in goodeids and anablepids. Furthermore, there are two different forms of embryonic nutrition: lecithotrophy and matrotrophy; depending on the species, these can be exclusive or coexist during gestation. In matrotrophic species, nutrients are transmitted from the mother to the embryo and are especially important in species with intraluminal gestation. Jenynsia lineata is a South American viviparous teleost with intraluminal gestation, characterized by eggs with scarce yolk, which is resorbed when embryos are 6 mm long, thus developing a branchial placenta. Using histological, histochemical, and immunohistochemical techniques, the present study describes the characteristics and changes of the ovarian mucosa in J. lineata during gestational and nongestational phases, and analyzes the embryonic pharyngeal epithelium in the branchial placenta. The ovaries of 30 adult female specimens were processed using histological techniques and stained with hematoxylin-eosin, Masson's trichrome, and Alcian Blue pH 2.5/periodic acid Schiff reagent. To detect cell proliferation, we used antiproliferating cell nuclear antigen antibody. In nonpregnant females, eosinophilic granular cells (EGCs) and lymphocytes were identified in the lamina propria of the tunica mucosa, and melanomacrophage centers (MMCs) and fibroblasts were identified adjacent to tissue debris in the ovarian folds'. In the cellular debris, an embryo in resorption was observed. In pregnant females, the ovarian mucosa has thin vascularization branches entering the opercular chamber of the embryos, in close contact with the forming gill processes, thereby establishing a branchial placenta. Active cell replacement was observed in these ovarian branches. The identification of fibroblasts, lymphocytes,EGCs, and MMCs adjacent to tissue debris could indicate that these cell types are involved in the embryonic resorption process. Considering the new data obtained in this study on the branchial placenta of J. lineata, we conclude that cell proliferation could be involved in the development of maternal-embryonic interaction.

Nephroprotection of p-coumaric acid against sublethal dose of carbon tetrachloride in Wistar rats: histological evidence

In Mexico, chronic kidney disease is a public health problem, when is diagnosed in advanced stages, the only treatment options are dialysis, hemodialysis or organ transplantation, however, the health system does not have the economic capacity or the infrastructure to fully cover these treatments. Therefore, the objective of this research work was to evaluate the activity of the p-coumaric acid (pCA) as a possible nephroprotective agent against toxic carbon tetrachloride (CCl4)-induced kidney damage in male Wistar rats. Renal parenchyma was evaluated using two stains, hematoxylin and eosin (H&E) and periodic acid with Schiff's reagent (PAS). The administration of CCl4 (4 g/kg, p.o., one dose) induced tubular necrosis and glomerular rupture within 24 h, with loss of microvilli and basement membranes, with widening of the lumen of the distal and proximal tubules. On the other hand, pCA (100 mg/kg, p.o., administered 24 h and 1 h before CCl4 and 1 h after this toxic agent) showed nephroprotective action by reducing the presence of these morphological changes. Our results suggest for the first time that pCA, when administered preventively, slows the deterioration of renal structure induced by acute exposure to a sublethal dose of CCl4.

Aldehyde-functionalized cellulose as reactive sorbents for the capture and retention of polyamine odor molecules associated with chronic wounds

Aldehyde-functionalized cellulose (AFC) was prepared by oxidizing cellulose with sodium metaperiodate. The reaction was characterized by Schiff's test, FT-IR, and UV–vis study. AFC was evaluated as a reactive sorbent for controlling polyamine-based odor from chronic wounds, and its performance was compared with charcoal, one of the most widely utilized odor-control sorbents through physisorption. Cadaverine was used as the model odor molecule. A liquid chromatography/mass spectrometry (LC/MS) method was established to quantify the compound. AFC was found to rapidly react with cadaverine through the Schiff-base reaction, which was confirmed by FT-IR, visual observation, CHN elemental analysis, and the ninhydrin test. The sorption and desorption behaviors of cadaverine onto AFC were quantified. With clinic-relevant cadaverine concentrations, AFC demonstrated much better sorption performance than charcoal. At even higher cadaverine concentrations charcoal showed higher sorption capacity, probably due to its high surface area. On the other hand, in desorption studies, AFC retained much more of the sorbed cadaverine than charcoal. When AFC and charcoal were combined, the pair demonstrated excellent sorption and desorption behaviors. The XTT (2,3-bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide) assay confirmed that AFC has very good in vitro biocompatibility. These results suggest that AFC-based reactive sorption can be a new strategy to control odors associated with chronic wounds for improved healthcare.

Analysis of Formaldehyde in Circulating Grapes in Makassar

Formalin or formaldehyde is a chemical compound whose use is prohibited as a preservative in food additives. This study aims to analyze the content of formalin in red grapes (Vitis vinifera) circulating in the city of Makassar. The method used in this test is by using Schiff reagent and UV-Vis spectrophotometry. The results of the Schiff reagent test showed that two of the 10 grape samples were positive for formalin. Test results on UV-Vis Spectrophotometry at a wavelength of 556 nm, that all red grape samples obtained contained formalin with formalin levels as follows: Sample Tamalanrea 1 TD = 0.778%, Tamalanrea 2 TD = 0.483%, Manggala TD= 0.452%, Tamalate TD= 0.734%, Biringkanaya TD= 0.552%, Tamalanrea 1 SD= 0.452%.

The Green chili to reduce formaldehyde in tofu by the spectrophotometric method using Schiff reagent

Tofu is a processed soybean food ingredient that is widely consumed by the public. Besides having a high nutritional content, tofu is also relatively cheap and easy to obtain. Tofu has a short shelf life and is easily damaged, so producers often add the preservative formaldehyde, which has been banned for use. Formalin or formaldehyde is not included in the list of food additives because they are toxic and harmful to health. This study was aimed to determine the reduction of formalin levels in white tofu by soaking green chilies. The study was carried out experimentally with the spectrophotometric method using the Schiff reagent. Absorbance measurements were carried out at a maximum wavelength of 580 nm. Parameters observed were the addition of 0% green chili solution concentration 0%; 2.5%; 5.0%; 7.5%; 10%; and 12.5% for 10 minutes of continuous immersion; 20 minutes; and 30 minutes. Based on the results of the study, it was found that each addition of green chili solution concentration reduced the formalin level along with the soaking time. The addition of 12.5% green chili solution for 30 minutes resulted in the greatest decrease in formalin levels, namely 69.82%. Based on these results it was concluded that the addition of green chili solution could reduce formalin in tofu.

Histological and histochemical changes in liver tissue of young rats with hyperhomocysteinemia

Annotation. The decisive place in the synthesis and subsequent metabolism of homocysteine (Hcy) belongs to the liver, where, in particular, transsulfation and remethylation processes take place. It has been proven that organ tissue damage can cause hyperhomocysteinemia (HHcy). Changes in the structural and functional parameters of the liver tissue under the conditions of a significant and long-term increase in blood serum Hcy are still insufficiently studied. Modeling the state of chronic HHcy and studying the features of histological changes in liver tissue at different levels of structural organization is an urgent task. The aim of the research is to study morphological and histochemical changes in the liver tissue of young rats with HHcy. The experiment was carried out on 22 white non-linear young – aged 1-2 months, male rats. During the study, the animals were divided into two groups – control and experimental. Chronic persistent HHcy was modeled by administering thiolactone Hcy in a dose of 200 mg/kg of body weight intragastrically for 60 days to the rats of the experimental group. Histological preparations were studied using a SEO SСAN light microscope and photo-documented using a Vision CCD Camera. Succinate dehydrogenase was detected histochemically according to the Nakhlas method. To study the specifics of glycogen accumulation in hepatocytes, sections were stained using Schiff's reagent, after preliminary treatment with iodic acid (PAS reaction) in the Shabadash modification. It was established that the administration of thiolactone Hcy to young rats at a dose of 200 mg/kg led to impaired blood supply, destructive changes and growth of connective tissue in the liver. Moderate changes in the hepatocyte plates organization, a decrease in the mitotic activity of hepatocytes, and the development of fatty and vacuole-hydropic dystrophy were recorded. Histochemical studies of the liver of animals of the research group established a decrease in the activity of the succinate dehydrogenase enzyme and glycogen content in hepatocytes.

Study of Formaldehyde Content in Different Types of Tofu Using Micro Scale Laboratory Based Visible Beam Spectrophotometry

Microscale laboratory is an analytical technique that requires a little reagent and produces a little waste. One application of microscale laboratory is the analysis of formaldehyde content in tofu. Formaldehyde is one of the chemicals that is harmful to the body but is often misused as a food preservative in tofu. This study aims at determining the presence of formaldehyde in tofu using laboratory microscale-based Schiff reagents. The use of microscale laboratories is expected to reduce waste and support the implementation of green chemistry. The method used was a calibration curve using a series of standard solutions of 10 ppm, 15 ppm, 20 ppm, 25 ppm, and 30 ppm with scanning at a wavelength of 561 nm. In the qualitative test, all samples were reactive and showed a purplish red color. In the qualitative test, the highest formaldehyde content in the tofu sample was obtained in the white tofu 3 with a content of 99.7 ppm.